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   1 /* $Id: sun4c.c,v 1.212 2001/12/21 04:56:15 davem Exp $
   2  * sun4c.c: Doing in software what should be done in hardware.
   3  *
   4  * Copyright (C) 1996 David S. Miller (davem@caip.rutgers.edu)
   5  * Copyright (C) 1996 Eddie C. Dost (ecd@skynet.be)
   6  * Copyright (C) 1996 Andrew Tridgell (Andrew.Tridgell@anu.edu.au)
   7  * Copyright (C) 1997-2000 Anton Blanchard (anton@samba.org)
   8  * Copyright (C) 1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
   9  */
  10
  11 #define NR_TASK_BUCKETS 512
  12
  13 #include <linux/config.h>
  14 #include <linux/kernel.h>
  15 #include <linux/mm.h>
  16 #include <linux/init.h>
  17 #include <linux/bootmem.h>
  18 #include <linux/highmem.h>
  19 #include <linux/fs.h>
  20 #include <linux/seq_file.h>
  21
  22 #include <asm/scatterlist.h>
  23 #include <asm/page.h>
  24 #include <asm/pgalloc.h>
  25 #include <asm/pgtable.h>
  26 #include <asm/vaddrs.h>
  27 #include <asm/idprom.h>
  28 #include <asm/machines.h>
  29 #include <asm/memreg.h>
  30 #include <asm/processor.h>
  31 #include <asm/auxio.h>
  32 #include <asm/io.h>
  33 #include <asm/oplib.h>
  34 #include <asm/openprom.h>
  35 #include <asm/mmu_context.h>
  36 #include <asm/sun4paddr.h>
  37 #include <asm/highmem.h>
  38 #include <asm/btfixup.h>
  39 #include <asm/cacheflush.h>
  40 #include <asm/tlbflush.h>
  41
  42 /* Because of our dynamic kernel TLB miss strategy, and how
  43  * our DVMA mapping allocation works, you _MUST_:
  44  *
  45  * 1) Disable interrupts _and_ not touch any dynamic kernel
  46  *    memory while messing with kernel MMU state.  By
  47  *    dynamic memory I mean any object which is not in
  48  *    the kernel image itself or a thread_union (both of
  49  *    which are locked into the MMU).
  50  * 2) Disable interrupts while messing with user MMU state.
  51  */
  52
  53 extern int num_segmaps, num_contexts;
  54
  55 extern unsigned long page_kernel;
  56
  57 #ifdef CONFIG_SUN4
  58 #define SUN4C_VAC_SIZE sun4c_vacinfo.num_bytes
  59 #else
  60 /* That's it, we prom_halt() on sun4c if the cache size is something other than 65536.
  61  * So let's save some cycles and just use that everywhere except for that bootup
  62  * sanity check.
  63  */
  64 #define SUN4C_VAC_SIZE 65536
  65 #endif
  66
  67 #define SUN4C_KERNEL_BUCKETS 32
  68
  69 /* Flushing the cache. */
  70 struct sun4c_vac_props sun4c_vacinfo;
  71 unsigned long sun4c_kernel_faults;
  72
  73 /* Invalidate every sun4c cache line tag. */
  74 static void __init sun4c_flush_all(void)
  75 {
  76         unsigned long begin, end;
  77
  78         if (sun4c_vacinfo.on)
  79                 panic("SUN4C: AIEEE, trying to invalidate vac while it is on.");
  80
  81         /* Clear 'valid' bit in all cache line tags */
  82         begin = AC_CACHETAGS;
  83         end = (AC_CACHETAGS + SUN4C_VAC_SIZE);
  84         while (begin < end) {
  85                 __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
  86                                      "r" (begin), "i" (ASI_CONTROL));
  87                 begin += sun4c_vacinfo.linesize;
  88         }
  89 }
  90
  91 static void sun4c_flush_context_hw(void)
  92 {
  93         unsigned long end = SUN4C_VAC_SIZE;
  94
  95         __asm__ __volatile__(
  96                 "1:     addcc   %0, -4096, %0\n\t"
  97                 "       bne     1b\n\t"
  98                 "        sta    %%g0, [%0] %2"
  99         : "=&r" (end)
 100         : "0" (end), "i" (ASI_HWFLUSHCONTEXT)
 101         : "cc");
 102 }
 103
 104 /* Must be called minimally with IRQs disabled. */
 105 static void sun4c_flush_segment_hw(unsigned long addr)
 106 {
 107         if (sun4c_get_segmap(addr) != invalid_segment) {
 108                 unsigned long vac_size = SUN4C_VAC_SIZE;
 109
 110                 __asm__ __volatile__(
 111                         "1:     addcc   %0, -4096, %0\n\t"
 112                         "       bne     1b\n\t"
 113                         "        sta    %%g0, [%2 + %0] %3"
 114                         : "=&r" (vac_size)
 115                         : "0" (vac_size), "r" (addr), "i" (ASI_HWFLUSHSEG)
 116                         : "cc");
 117         }
 118 }
 119
 120 /* File local boot time fixups. */
 121 BTFIXUPDEF_CALL(void, sun4c_flush_page, unsigned long)
 122 BTFIXUPDEF_CALL(void, sun4c_flush_segment, unsigned long)
 123 BTFIXUPDEF_CALL(void, sun4c_flush_context, void)
 124
 125 #define sun4c_flush_page(addr) BTFIXUP_CALL(sun4c_flush_page)(addr)
 126 #define sun4c_flush_segment(addr) BTFIXUP_CALL(sun4c_flush_segment)(addr)
 127 #define sun4c_flush_context() BTFIXUP_CALL(sun4c_flush_context)()
 128
 129 /* Must be called minimally with interrupts disabled. */
 130 static void sun4c_flush_page_hw(unsigned long addr)
 131 {
 132         addr &= PAGE_MASK;
 133         if ((int)sun4c_get_pte(addr) < 0)
 134                 __asm__ __volatile__("sta %%g0, [%0] %1"
 135                                      : : "r" (addr), "i" (ASI_HWFLUSHPAGE));
 136 }
 137
 138 /* Don't inline the software version as it eats too many cache lines if expanded. */
 139 static void sun4c_flush_context_sw(void)
 140 {
 141         unsigned long nbytes = SUN4C_VAC_SIZE;
 142         unsigned long lsize = sun4c_vacinfo.linesize;
 143
 144         __asm__ __volatile__(
 145         "add    %2, %2, %%g1\n\t"
 146         "add    %2, %%g1, %%g2\n\t"
 147         "add    %2, %%g2, %%g3\n\t"
 148         "add    %2, %%g3, %%g4\n\t"
 149         "add    %2, %%g4, %%g5\n\t"
 150         "add    %2, %%g5, %%o4\n\t"
 151         "add    %2, %%o4, %%o5\n"
 152         "1:\n\t"
 153         "subcc  %0, %%o5, %0\n\t"
 154         "sta    %%g0, [%0] %3\n\t"
 155         "sta    %%g0, [%0 + %2] %3\n\t"
 156         "sta    %%g0, [%0 + %%g1] %3\n\t"
 157         "sta    %%g0, [%0 + %%g2] %3\n\t"
 158         "sta    %%g0, [%0 + %%g3] %3\n\t"
 159         "sta    %%g0, [%0 + %%g4] %3\n\t"
 160         "sta    %%g0, [%0 + %%g5] %3\n\t"
 161         "bg     1b\n\t"
 162         " sta   %%g0, [%1 + %%o4] %3\n"
 163         : "=&r" (nbytes)
 164         : "0" (nbytes), "r" (lsize), "i" (ASI_FLUSHCTX)
 165         : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
 166 }
 167
 168 /* Don't inline the software version as it eats too many cache lines if expanded. */
 169 static void sun4c_flush_segment_sw(unsigned long addr)
 170 {
 171         if (sun4c_get_segmap(addr) != invalid_segment) {
 172                 unsigned long nbytes = SUN4C_VAC_SIZE;
 173                 unsigned long lsize = sun4c_vacinfo.linesize;
 174
 175                 __asm__ __volatile__(
 176                 "add    %2, %2, %%g1\n\t"
 177                 "add    %2, %%g1, %%g2\n\t"
 178                 "add    %2, %%g2, %%g3\n\t"
 179                 "add    %2, %%g3, %%g4\n\t"
 180                 "add    %2, %%g4, %%g5\n\t"
 181                 "add    %2, %%g5, %%o4\n\t"
 182                 "add    %2, %%o4, %%o5\n"
 183                 "1:\n\t"
 184                 "subcc  %1, %%o5, %1\n\t"
 185                 "sta    %%g0, [%0] %6\n\t"
 186                 "sta    %%g0, [%0 + %2] %6\n\t"
 187                 "sta    %%g0, [%0 + %%g1] %6\n\t"
 188                 "sta    %%g0, [%0 + %%g2] %6\n\t"
 189                 "sta    %%g0, [%0 + %%g3] %6\n\t"
 190                 "sta    %%g0, [%0 + %%g4] %6\n\t"
 191                 "sta    %%g0, [%0 + %%g5] %6\n\t"
 192                 "sta    %%g0, [%0 + %%o4] %6\n\t"
 193                 "bg     1b\n\t"
 194                 " add   %0, %%o5, %0\n"
 195                 : "=&r" (addr), "=&r" (nbytes), "=&r" (lsize)
 196                 : "0" (addr), "1" (nbytes), "2" (lsize),
 197                   "i" (ASI_FLUSHSEG)
 198                 : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
 199         }
 200 }
 201
 202 /* Don't inline the software version as it eats too many cache lines if expanded. */
 203 static void sun4c_flush_page_sw(unsigned long addr)
 204 {
 205         addr &= PAGE_MASK;
 206         if ((sun4c_get_pte(addr) & (_SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_VALID)) ==
 207             _SUN4C_PAGE_VALID) {
 208                 unsigned long left = PAGE_SIZE;
 209                 unsigned long lsize = sun4c_vacinfo.linesize;
 210
 211                 __asm__ __volatile__(
 212                 "add    %2, %2, %%g1\n\t"
 213                 "add    %2, %%g1, %%g2\n\t"
 214                 "add    %2, %%g2, %%g3\n\t"
 215                 "add    %2, %%g3, %%g4\n\t"
 216                 "add    %2, %%g4, %%g5\n\t"
 217                 "add    %2, %%g5, %%o4\n\t"
 218                 "add    %2, %%o4, %%o5\n"
 219                 "1:\n\t"
 220                 "subcc  %1, %%o5, %1\n\t"
 221                 "sta    %%g0, [%0] %6\n\t"
 222                 "sta    %%g0, [%0 + %2] %6\n\t"
 223                 "sta    %%g0, [%0 + %%g1] %6\n\t"
 224                 "sta    %%g0, [%0 + %%g2] %6\n\t"
 225                 "sta    %%g0, [%0 + %%g3] %6\n\t"
 226                 "sta    %%g0, [%0 + %%g4] %6\n\t"
 227                 "sta    %%g0, [%0 + %%g5] %6\n\t"
 228                 "sta    %%g0, [%0 + %%o4] %6\n\t"
 229                 "bg     1b\n\t"
 230                 " add   %0, %%o5, %0\n"
 231                 : "=&r" (addr), "=&r" (left), "=&r" (lsize)
 232                 : "0" (addr), "1" (left), "2" (lsize),
 233                   "i" (ASI_FLUSHPG)
 234                 : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
 235         }
 236 }
 237
 238 /* The sun4c's do have an on chip store buffer.  And the way you
 239  * clear them out isn't so obvious.  The only way I can think of
 240  * to accomplish this is to read the current context register,
 241  * store the same value there, then read an external hardware
 242  * register.
 243  */
 244 void sun4c_complete_all_stores(void)
 245 {
 246         volatile int _unused;
 247
 248         _unused = sun4c_get_context();
 249         sun4c_set_context(_unused);
 250 #ifdef CONFIG_SUN_AUXIO
 251         _unused = get_auxio();
 252 #endif
 253 }
 254
 255 /* Bootup utility functions. */
 256 static inline void sun4c_init_clean_segmap(unsigned char pseg)
 257 {
 258         unsigned long vaddr;
 259
 260         sun4c_put_segmap(0, pseg);
 261         for (vaddr = 0; vaddr < SUN4C_REAL_PGDIR_SIZE; vaddr += PAGE_SIZE)
 262                 sun4c_put_pte(vaddr, 0);
 263         sun4c_put_segmap(0, invalid_segment);
 264 }
 265
 266 static inline void sun4c_init_clean_mmu(unsigned long kernel_end)
 267 {
 268         unsigned long vaddr;
 269         unsigned char savectx, ctx;
 270
 271         savectx = sun4c_get_context();
 272         kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end);
 273         for (ctx = 0; ctx < num_contexts; ctx++) {
 274                 sun4c_set_context(ctx);
 275                 for (vaddr = 0; vaddr < 0x20000000; vaddr += SUN4C_REAL_PGDIR_SIZE)
 276                         sun4c_put_segmap(vaddr, invalid_segment);
 277                 for (vaddr = 0xe0000000; vaddr < KERNBASE; vaddr += SUN4C_REAL_PGDIR_SIZE)
 278                         sun4c_put_segmap(vaddr, invalid_segment);
 279                 for (vaddr = kernel_end; vaddr < KADB_DEBUGGER_BEGVM; vaddr += SUN4C_REAL_PGDIR_SIZE)
 280                         sun4c_put_segmap(vaddr, invalid_segment);
 281                 for (vaddr = LINUX_OPPROM_ENDVM; vaddr; vaddr += SUN4C_REAL_PGDIR_SIZE)
 282                         sun4c_put_segmap(vaddr, invalid_segment);
 283         }
 284         sun4c_set_context(savectx);
 285 }
 286
 287 void __init sun4c_probe_vac(void)
 288 {
 289         sun4c_disable_vac();
 290
 291         if (ARCH_SUN4) {
 292                 switch (idprom->id_machtype) {
 293
 294                 case (SM_SUN4|SM_4_110):
 295                         sun4c_vacinfo.type = VAC_NONE;
 296                         sun4c_vacinfo.num_bytes = 0;
 297                         sun4c_vacinfo.linesize = 0;
 298                         sun4c_vacinfo.do_hwflushes = 0;
 299                         prom_printf("No VAC. Get some bucks and buy a real computer.");
 300                         prom_halt();
 301                         break;
 302
 303                 case (SM_SUN4|SM_4_260):
 304                         sun4c_vacinfo.type = VAC_WRITE_BACK;
 305                         sun4c_vacinfo.num_bytes = 128 * 1024;
 306                         sun4c_vacinfo.linesize = 16;
 307                         sun4c_vacinfo.do_hwflushes = 0;
 308                         break;
 309
 310                 case (SM_SUN4|SM_4_330):
 311                         sun4c_vacinfo.type = VAC_WRITE_THROUGH;
 312                         sun4c_vacinfo.num_bytes = 128 * 1024;
 313                         sun4c_vacinfo.linesize = 16;
 314                         sun4c_vacinfo.do_hwflushes = 0;
 315                         break;
 316
 317                 case (SM_SUN4|SM_4_470):
 318                         sun4c_vacinfo.type = VAC_WRITE_BACK;
 319                         sun4c_vacinfo.num_bytes = 128 * 1024;
 320                         sun4c_vacinfo.linesize = 32;
 321                         sun4c_vacinfo.do_hwflushes = 0;
 322                         break;
 323
 324                 default:
 325                         prom_printf("Cannot initialize VAC - weird sun4 model idprom->id_machtype = %d", idprom->id_machtype);
 326                         prom_halt();
 327                 };
 328         } else {
 329                 sun4c_vacinfo.type = VAC_WRITE_THROUGH;
 330
 331                 if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
 332                     (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
 333                         /* PROM on SS1 lacks this info, to be super safe we
 334                          * hard code it here since this arch is cast in stone.
 335                          */
 336                         sun4c_vacinfo.num_bytes = 65536;
 337                         sun4c_vacinfo.linesize = 16;
 338                 } else {
 339                         sun4c_vacinfo.num_bytes =
 340                          prom_getintdefault(prom_root_node, "vac-size", 65536);
 341                         sun4c_vacinfo.linesize =
 342                          prom_getintdefault(prom_root_node, "vac-linesize", 16);
 343                 }
 344                 sun4c_vacinfo.do_hwflushes =
 345                  prom_getintdefault(prom_root_node, "vac-hwflush", 0);
 346
 347                 if (sun4c_vacinfo.do_hwflushes == 0)
 348                         sun4c_vacinfo.do_hwflushes =
 349                          prom_getintdefault(prom_root_node, "vac_hwflush", 0);
 350
 351                 if (sun4c_vacinfo.num_bytes != 65536) {
 352                         prom_printf("WEIRD Sun4C VAC cache size, "
 353                                     "tell sparclinux@vger.kernel.org");
 354                         prom_halt();
 355                 }
 356         }
 357
 358         sun4c_vacinfo.num_lines =
 359                 (sun4c_vacinfo.num_bytes / sun4c_vacinfo.linesize);
 360         switch (sun4c_vacinfo.linesize) {
 361         case 16:
 362                 sun4c_vacinfo.log2lsize = 4;
 363                 break;
 364         case 32:
 365                 sun4c_vacinfo.log2lsize = 5;
 366                 break;
 367         default:
 368                 prom_printf("probe_vac: Didn't expect vac-linesize of %d, halting\n",
 369                             sun4c_vacinfo.linesize);
 370                 prom_halt();
 371         };
 372
 373         sun4c_flush_all();
 374         sun4c_enable_vac();
 375 }
 376
 377 /* Patch instructions for the low level kernel fault handler. */
 378 extern unsigned long invalid_segment_patch1, invalid_segment_patch1_ff;
 379 extern unsigned long invalid_segment_patch2, invalid_segment_patch2_ff;
 380 extern unsigned long invalid_segment_patch1_1ff, invalid_segment_patch2_1ff;
 381 extern unsigned long num_context_patch1, num_context_patch1_16;
 382 extern unsigned long num_context_patch2_16;
 383 extern unsigned long vac_linesize_patch, vac_linesize_patch_32;
 384 extern unsigned long vac_hwflush_patch1, vac_hwflush_patch1_on;
 385 extern unsigned long vac_hwflush_patch2, vac_hwflush_patch2_on;
 386
 387 #define PATCH_INSN(src, dst) do {       \
 388                 daddr = &(dst);         \
 389                 iaddr = &(src);         \
 390                 *daddr = *iaddr;        \
 391         } while (0)
 392
 393 static void __init patch_kernel_fault_handler(void)
 394 {
 395         unsigned long *iaddr, *daddr;
 396
 397         switch (num_segmaps) {
 398                 case 128:
 399                         /* Default, nothing to do. */
 400                         break;
 401                 case 256:
 402                         PATCH_INSN(invalid_segment_patch1_ff,
 403                                    invalid_segment_patch1);
 404                         PATCH_INSN(invalid_segment_patch2_ff,
 405                                    invalid_segment_patch2);
 406                         break;
 407                 case 512:
 408                         PATCH_INSN(invalid_segment_patch1_1ff,
 409                                    invalid_segment_patch1);
 410                         PATCH_INSN(invalid_segment_patch2_1ff,
 411                                    invalid_segment_patch2);
 412                         break;
 413                 default:
 414                         prom_printf("Unhandled number of segmaps: %d\n",
 415                                     num_segmaps);
 416                         prom_halt();
 417         };
 418         switch (num_contexts) {
 419                 case 8:
 420                         /* Default, nothing to do. */
 421                         break;
 422                 case 16:
 423                         PATCH_INSN(num_context_patch1_16,
 424                                    num_context_patch1);
 425                         break;
 426                 default:
 427                         prom_printf("Unhandled number of contexts: %d\n",
 428                                     num_contexts);
 429                         prom_halt();
 430         };
 431
 432         if (sun4c_vacinfo.do_hwflushes != 0) {
 433                 PATCH_INSN(vac_hwflush_patch1_on, vac_hwflush_patch1);
 434                 PATCH_INSN(vac_hwflush_patch2_on, vac_hwflush_patch2);
 435         } else {
 436                 switch (sun4c_vacinfo.linesize) {
 437                 case 16:
 438                         /* Default, nothing to do. */
 439                         break;
 440                 case 32:
 441                         PATCH_INSN(vac_linesize_patch_32, vac_linesize_patch);
 442                         break;
 443                 default:
 444                         prom_printf("Impossible VAC linesize %d, halting...\n",
 445                                     sun4c_vacinfo.linesize);
 446                         prom_halt();
 447                 };
 448         }
 449 }
 450
 451 static void __init sun4c_probe_mmu(void)
 452 {
 453         if (ARCH_SUN4) {
 454                 switch (idprom->id_machtype) {
 455                 case (SM_SUN4|SM_4_110):
 456                         prom_printf("No support for 4100 yet\n");
 457                         prom_halt();
 458                         num_segmaps = 256;
 459                         num_contexts = 8;
 460                         break;
 461
 462                 case (SM_SUN4|SM_4_260):
 463                         /* should be 512 segmaps. when it get fixed */
 464                         num_segmaps = 256;
 465                         num_contexts = 16;
 466                         break;
 467
 468                 case (SM_SUN4|SM_4_330):
 469                         num_segmaps = 256;
 470                         num_contexts = 16;
 471                         break;
 472
 473                 case (SM_SUN4|SM_4_470):
 474                         /* should be 1024 segmaps. when it get fixed */
 475                         num_segmaps = 256;
 476                         num_contexts = 64;
 477                         break;
 478                 default:
 479                         prom_printf("Invalid SUN4 model\n");
 480                         prom_halt();
 481                 };
 482         } else {
 483                 if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
 484                     (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
 485                         /* Hardcode these just to be safe, PROM on SS1 does
 486                         * not have this info available in the root node.
 487                         */
 488                         num_segmaps = 128;
 489                         num_contexts = 8;
 490                 } else {
 491                         num_segmaps =
 492                             prom_getintdefault(prom_root_node, "mmu-npmg", 128);
 493                         num_contexts =
 494                             prom_getintdefault(prom_root_node, "mmu-nctx", 0x8);
 495                 }
 496         }
 497         patch_kernel_fault_handler();
 498 }
 499
 500 volatile unsigned long __iomem *sun4c_memerr_reg = NULL;
 501
 502 void __init sun4c_probe_memerr_reg(void)
 503 {
 504         int node;
 505         struct linux_prom_registers regs[1];
 506
 507         if (ARCH_SUN4) {
 508                 sun4c_memerr_reg = ioremap(sun4_memreg_physaddr, PAGE_SIZE);
 509         } else {
 510                 node = prom_getchild(prom_root_node);
 511                 node = prom_searchsiblings(prom_root_node, "memory-error");
 512                 if (!node)
 513                         return;
 514                 if (prom_getproperty(node, "reg", (char *)regs, sizeof(regs)) <= 0)
 515                         return;
 516                 /* hmm I think regs[0].which_io is zero here anyways */
 517                 sun4c_memerr_reg = ioremap(regs[0].phys_addr, regs[0].reg_size);
 518         }
 519 }
 520
 521 static inline void sun4c_init_ss2_cache_bug(void)
 522 {
 523         extern unsigned long start;
 524
 525         if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS2)) ||
 526             (idprom->id_machtype == (SM_SUN4C | SM_4C_IPX)) ||
 527             (idprom->id_machtype == (SM_SUN4 | SM_4_330)) ||
 528             (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC))) {
 529                 /* Whee.. */
 530                 printk("SS2 cache bug detected, uncaching trap table page\n");
 531                 sun4c_flush_page((unsigned int) &start);
 532                 sun4c_put_pte(((unsigned long) &start),
 533                         (sun4c_get_pte((unsigned long) &start) | _SUN4C_PAGE_NOCACHE));
 534         }
 535 }
 536
 537 /* Addr is always aligned on a page boundary for us already. */
 538 static int sun4c_map_dma_area(dma_addr_t *pba, unsigned long va,
 539     unsigned long addr, int len)
 540 {
 541         unsigned long page, end;
 542
 543         *pba = addr;
 544
 545         end = PAGE_ALIGN((addr + len));
 546         while (addr < end) {
 547                 page = va;
 548                 sun4c_flush_page(page);
 549                 page -= PAGE_OFFSET;
 550                 page >>= PAGE_SHIFT;
 551                 page |= (_SUN4C_PAGE_VALID | _SUN4C_PAGE_DIRTY |
 552                          _SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_PRIV);
 553                 sun4c_put_pte(addr, page);
 554                 addr += PAGE_SIZE;
 555                 va += PAGE_SIZE;
 556         }
 557
 558         return 0;
 559 }
 560
 561 static struct page *sun4c_translate_dvma(unsigned long busa)
 562 {
 563         /* Fortunately for us, bus_addr == uncached_virt in sun4c. */
 564         unsigned long pte = sun4c_get_pte(busa);
 565         return pfn_to_page(pte & SUN4C_PFN_MASK);
 566 }
 567
 568 static void sun4c_unmap_dma_area(unsigned long busa, int len)
 569 {
 570         /* Fortunately for us, bus_addr == uncached_virt in sun4c. */
 571         /* XXX Implement this */
 572 }
 573
 574 /* TLB management. */
 575
 576 /* Don't change this struct without changing entry.S. This is used
 577  * in the in-window kernel fault handler, and you don't want to mess
 578  * with that. (See sun4c_fault in entry.S).
 579  */
 580 struct sun4c_mmu_entry {
 581         struct sun4c_mmu_entry *next;
 582         struct sun4c_mmu_entry *prev;
 583         unsigned long vaddr;
 584         unsigned char pseg;
 585         unsigned char locked;
 586
 587         /* For user mappings only, and completely hidden from kernel
 588          * TLB miss code.
 589          */
 590         unsigned char ctx;
 591         struct sun4c_mmu_entry *lru_next;
 592         struct sun4c_mmu_entry *lru_prev;
 593 };
 594
 595 static struct sun4c_mmu_entry mmu_entry_pool[SUN4C_MAX_SEGMAPS];
 596
 597 static void __init sun4c_init_mmu_entry_pool(void)
 598 {
 599         int i;
 600
 601         for (i=0; i < SUN4C_MAX_SEGMAPS; i++) {
 602                 mmu_entry_pool[i].pseg = i;
 603                 mmu_entry_pool[i].next = NULL;
 604                 mmu_entry_pool[i].prev = NULL;
 605                 mmu_entry_pool[i].vaddr = 0;
 606                 mmu_entry_pool[i].locked = 0;
 607                 mmu_entry_pool[i].ctx = 0;
 608                 mmu_entry_pool[i].lru_next = NULL;
 609                 mmu_entry_pool[i].lru_prev = NULL;
 610         }
 611         mmu_entry_pool[invalid_segment].locked = 1;
 612 }
 613
 614 static inline void fix_permissions(unsigned long vaddr, unsigned long bits_on,
 615                                    unsigned long bits_off)
 616 {
 617         unsigned long start, end;
 618
 619         end = vaddr + SUN4C_REAL_PGDIR_SIZE;
 620         for (start = vaddr; start < end; start += PAGE_SIZE)
 621                 if (sun4c_get_pte(start) & _SUN4C_PAGE_VALID)
 622                         sun4c_put_pte(start, (sun4c_get_pte(start) | bits_on) &
 623                                       ~bits_off);
 624 }
 625
 626 static inline void sun4c_init_map_kernelprom(unsigned long kernel_end)
 627 {
 628         unsigned long vaddr;
 629         unsigned char pseg, ctx;
 630 #ifdef CONFIG_SUN4
 631         /* sun4/110 and 260 have no kadb. */
 632         if ((idprom->id_machtype != (SM_SUN4 | SM_4_260)) &&
 633             (idprom->id_machtype != (SM_SUN4 | SM_4_110))) {
 634 #endif
 635         for (vaddr = KADB_DEBUGGER_BEGVM;
 636              vaddr < LINUX_OPPROM_ENDVM;
 637              vaddr += SUN4C_REAL_PGDIR_SIZE) {
 638                 pseg = sun4c_get_segmap(vaddr);
 639                 if (pseg != invalid_segment) {
 640                         mmu_entry_pool[pseg].locked = 1;
 641                         for (ctx = 0; ctx < num_contexts; ctx++)
 642                                 prom_putsegment(ctx, vaddr, pseg);
 643                         fix_permissions(vaddr, _SUN4C_PAGE_PRIV, 0);
 644                 }
 645         }
 646 #ifdef CONFIG_SUN4
 647         }
 648 #endif
 649         for (vaddr = KERNBASE; vaddr < kernel_end; vaddr += SUN4C_REAL_PGDIR_SIZE) {
 650                 pseg = sun4c_get_segmap(vaddr);
 651                 mmu_entry_pool[pseg].locked = 1;
 652                 for (ctx = 0; ctx < num_contexts; ctx++)
 653                         prom_putsegment(ctx, vaddr, pseg);
 654                 fix_permissions(vaddr, _SUN4C_PAGE_PRIV, _SUN4C_PAGE_NOCACHE);
 655         }
 656 }
 657
 658 static void __init sun4c_init_lock_area(unsigned long start, unsigned long end)
 659 {
 660         int i, ctx;
 661
 662         while (start < end) {
 663                 for (i = 0; i < invalid_segment; i++)
 664                         if (!mmu_entry_pool[i].locked)
 665                                 break;
 666                 mmu_entry_pool[i].locked = 1;
 667                 sun4c_init_clean_segmap(i);
 668                 for (ctx = 0; ctx < num_contexts; ctx++)
 669                         prom_putsegment(ctx, start, mmu_entry_pool[i].pseg);
 670                 start += SUN4C_REAL_PGDIR_SIZE;
 671         }
 672 }
 673
 674 /* Don't change this struct without changing entry.S. This is used
 675  * in the in-window kernel fault handler, and you don't want to mess
 676  * with that. (See sun4c_fault in entry.S).
 677  */
 678 struct sun4c_mmu_ring {
 679         struct sun4c_mmu_entry ringhd;
 680         int num_entries;
 681 };
 682
 683 static struct sun4c_mmu_ring sun4c_context_ring[SUN4C_MAX_CONTEXTS]; /* used user entries */
 684 static struct sun4c_mmu_ring sun4c_ufree_ring;       /* free user entries */
 685 static struct sun4c_mmu_ring sun4c_ulru_ring;        /* LRU user entries */
 686 struct sun4c_mmu_ring sun4c_kernel_ring;      /* used kernel entries */
 687 struct sun4c_mmu_ring sun4c_kfree_ring;       /* free kernel entries */
 688
 689 static inline void sun4c_init_rings(void)
 690 {
 691         int i;
 692
 693         for (i = 0; i < SUN4C_MAX_CONTEXTS; i++) {
 694                 sun4c_context_ring[i].ringhd.next =
 695                         sun4c_context_ring[i].ringhd.prev =
 696                         &sun4c_context_ring[i].ringhd;
 697                 sun4c_context_ring[i].num_entries = 0;
 698         }
 699         sun4c_ufree_ring.ringhd.next = sun4c_ufree_ring.ringhd.prev =
 700                 &sun4c_ufree_ring.ringhd;
 701         sun4c_ufree_ring.num_entries = 0;
 702         sun4c_ulru_ring.ringhd.lru_next = sun4c_ulru_ring.ringhd.lru_prev =
 703                 &sun4c_ulru_ring.ringhd;
 704         sun4c_ulru_ring.num_entries = 0;
 705         sun4c_kernel_ring.ringhd.next = sun4c_kernel_ring.ringhd.prev =
 706                 &sun4c_kernel_ring.ringhd;
 707         sun4c_kernel_ring.num_entries = 0;
 708         sun4c_kfree_ring.ringhd.next = sun4c_kfree_ring.ringhd.prev =
 709                 &sun4c_kfree_ring.ringhd;
 710         sun4c_kfree_ring.num_entries = 0;
 711 }
 712
 713 static void add_ring(struct sun4c_mmu_ring *ring,
 714                      struct sun4c_mmu_entry *entry)
 715 {
 716         struct sun4c_mmu_entry *head = &ring->ringhd;
 717
 718         entry->prev = head;
 719         (entry->next = head->next)->prev = entry;
 720         head->next = entry;
 721         ring->num_entries++;
 722 }
 723
 724 static __inline__ void add_lru(struct sun4c_mmu_entry *entry)
 725 {
 726         struct sun4c_mmu_ring *ring = &sun4c_ulru_ring;
 727         struct sun4c_mmu_entry *head = &ring->ringhd;
 728
 729         entry->lru_next = head;
 730         (entry->lru_prev = head->lru_prev)->lru_next = entry;
 731         head->lru_prev = entry;
 732 }
 733
 734 static void add_ring_ordered(struct sun4c_mmu_ring *ring,
 735                              struct sun4c_mmu_entry *entry)
 736 {
 737         struct sun4c_mmu_entry *head = &ring->ringhd;
 738         unsigned long addr = entry->vaddr;
 739
 740         while ((head->next != &ring->ringhd) && (head->next->vaddr < addr))
 741                 head = head->next;
 742
 743         entry->prev = head;
 744         (entry->next = head->next)->prev = entry;
 745         head->next = entry;
 746         ring->num_entries++;
 747
 748         add_lru(entry);
 749 }
 750
 751 static __inline__ void remove_ring(struct sun4c_mmu_ring *ring,
 752                                    struct sun4c_mmu_entry *entry)
 753 {
 754         struct sun4c_mmu_entry *next = entry->next;
 755
 756         (next->prev = entry->prev)->next = next;
 757         ring->num_entries--;
 758 }
 759
 760 static void remove_lru(struct sun4c_mmu_entry *entry)
 761 {
 762         struct sun4c_mmu_entry *next = entry->lru_next;
 763
 764         (next->lru_prev = entry->lru_prev)->lru_next = next;
 765 }
 766
 767 static void free_user_entry(int ctx, struct sun4c_mmu_entry *entry)
 768 {
 769         remove_ring(sun4c_context_ring+ctx, entry);
 770         remove_lru(entry);
 771         add_ring(&sun4c_ufree_ring, entry);
 772 }
 773
 774 static void free_kernel_entry(struct sun4c_mmu_entry *entry,
 775                               struct sun4c_mmu_ring *ring)
 776 {
 777         remove_ring(ring, entry);
 778         add_ring(&sun4c_kfree_ring, entry);
 779 }
 780
 781 static void __init sun4c_init_fill_kernel_ring(int howmany)
 782 {
 783         int i;
 784
 785         while (howmany) {
 786                 for (i = 0; i < invalid_segment; i++)
 787                         if (!mmu_entry_pool[i].locked)
 788                                 break;
 789                 mmu_entry_pool[i].locked = 1;
 790                 sun4c_init_clean_segmap(i);
 791                 add_ring(&sun4c_kfree_ring, &mmu_entry_pool[i]);
 792                 howmany--;
 793         }
 794 }
 795
 796 static void __init sun4c_init_fill_user_ring(void)
 797 {
 798         int i;
 799
 800         for (i = 0; i < invalid_segment; i++) {
 801                 if (mmu_entry_pool[i].locked)
 802                         continue;
 803                 sun4c_init_clean_segmap(i);
 804                 add_ring(&sun4c_ufree_ring, &mmu_entry_pool[i]);
 805         }
 806 }
 807
 808 static void sun4c_kernel_unmap(struct sun4c_mmu_entry *kentry)
 809 {
 810         int savectx, ctx;
 811
 812         savectx = sun4c_get_context();
 813         for (ctx = 0; ctx < num_contexts; ctx++) {
 814                 sun4c_set_context(ctx);
 815                 sun4c_put_segmap(kentry->vaddr, invalid_segment);
 816         }
 817         sun4c_set_context(savectx);
 818 }
 819
 820 static void sun4c_kernel_map(struct sun4c_mmu_entry *kentry)
 821 {
 822         int savectx, ctx;
 823
 824         savectx = sun4c_get_context();
 825         for (ctx = 0; ctx < num_contexts; ctx++) {
 826                 sun4c_set_context(ctx);
 827                 sun4c_put_segmap(kentry->vaddr, kentry->pseg);
 828         }
 829         sun4c_set_context(savectx);
 830 }
 831
 832 #define sun4c_user_unmap(__entry) \
 833         sun4c_put_segmap((__entry)->vaddr, invalid_segment)
 834
 835 static void sun4c_demap_context(struct sun4c_mmu_ring *crp, unsigned char ctx)
 836 {
 837         struct sun4c_mmu_entry *head = &crp->ringhd;
 838         unsigned long flags;
 839
 840         local_irq_save(flags);
 841         if (head->next != head) {
 842                 struct sun4c_mmu_entry *entry = head->next;
 843                 int savectx = sun4c_get_context();
 844
 845                 flush_user_windows();
 846                 sun4c_set_context(ctx);
 847                 sun4c_flush_context();
 848                 do {
 849                         struct sun4c_mmu_entry *next = entry->next;
 850
 851                         sun4c_user_unmap(entry);
 852                         free_user_entry(ctx, entry);
 853
 854                         entry = next;
 855                 } while (entry != head);
 856                 sun4c_set_context(savectx);
 857         }
 858         local_irq_restore(flags);
 859 }
 860
 861 static int sun4c_user_taken_entries;  /* This is how much we have.             */
 862 static int max_user_taken_entries;    /* This limits us and prevents deadlock. */
 863
 864 static struct sun4c_mmu_entry *sun4c_kernel_strategy(void)
 865 {
 866         struct sun4c_mmu_entry *this_entry;
 867
 868         /* If some are free, return first one. */
 869         if (sun4c_kfree_ring.num_entries) {
 870                 this_entry = sun4c_kfree_ring.ringhd.next;
 871                 return this_entry;
 872         }
 873
 874         /* Else free one up. */
 875         this_entry = sun4c_kernel_ring.ringhd.prev;
 876         sun4c_flush_segment(this_entry->vaddr);
 877         sun4c_kernel_unmap(this_entry);
 878         free_kernel_entry(this_entry, &sun4c_kernel_ring);
 879         this_entry = sun4c_kfree_ring.ringhd.next;
 880
 881         return this_entry;
 882 }
 883
 884 /* Using this method to free up mmu entries eliminates a lot of
 885  * potential races since we have a kernel that incurs tlb
 886  * replacement faults.  There may be performance penalties.
 887  *
 888  * NOTE: Must be called with interrupts disabled.
 889  */
 890 static struct sun4c_mmu_entry *sun4c_user_strategy(void)
 891 {
 892         struct sun4c_mmu_entry *entry;
 893         unsigned char ctx;
 894         int savectx;
 895
 896         /* If some are free, return first one. */
 897         if (sun4c_ufree_ring.num_entries) {
 898                 entry = sun4c_ufree_ring.ringhd.next;
 899                 goto unlink_out;
 900         }
 901
 902         if (sun4c_user_taken_entries) {
 903                 entry = sun4c_kernel_strategy();
 904                 sun4c_user_taken_entries--;
 905                 goto kunlink_out;
 906         }
 907
 908         /* Grab from the beginning of the LRU list. */
 909         entry = sun4c_ulru_ring.ringhd.lru_next;
 910         ctx = entry->ctx;
 911
 912         savectx = sun4c_get_context();
 913         flush_user_windows();
 914         sun4c_set_context(ctx);
 915         sun4c_flush_segment(entry->vaddr);
 916         sun4c_user_unmap(entry);
 917         remove_ring(sun4c_context_ring + ctx, entry);
 918         remove_lru(entry);
 919         sun4c_set_context(savectx);
 920
 921         return entry;
 922
 923 unlink_out:
 924         remove_ring(&sun4c_ufree_ring, entry);
 925         return entry;
 926 kunlink_out:
 927         remove_ring(&sun4c_kfree_ring, entry);
 928         return entry;
 929 }
 930
 931 /* NOTE: Must be called with interrupts disabled. */
 932 void sun4c_grow_kernel_ring(void)
 933 {
 934         struct sun4c_mmu_entry *entry;
 935
 936         /* Prevent deadlock condition. */
 937         if (sun4c_user_taken_entries >= max_user_taken_entries)
 938                 return;
 939
 940         if (sun4c_ufree_ring.num_entries) {
 941                 entry = sun4c_ufree_ring.ringhd.next;
 942                 remove_ring(&sun4c_ufree_ring, entry);
 943                 add_ring(&sun4c_kfree_ring, entry);
 944                 sun4c_user_taken_entries++;
 945         }
 946 }
 947
 948 /* 2 page buckets for task struct and kernel stack allocation.
 949  *
 950  * TASK_STACK_BEGIN
 951  * bucket[0]
 952  * bucket[1]
 953  *   [ ... ]
 954  * bucket[NR_TASK_BUCKETS-1]
 955  * TASK_STACK_BEGIN + (sizeof(struct task_bucket) * NR_TASK_BUCKETS)
 956  *
 957  * Each slot looks like:
 958  *
 959  *  page 1 --  task struct + beginning of kernel stack
 960  *  page 2 --  rest of kernel stack
 961  */
 962
 963 union task_union *sun4c_bucket[NR_TASK_BUCKETS];
 964
 965 static int sun4c_lowbucket_avail;
 966
 967 #define BUCKET_EMPTY     ((union task_union *) 0)
 968 #define BUCKET_SHIFT     (PAGE_SHIFT + 1)        /* log2(sizeof(struct task_bucket)) */
 969 #define BUCKET_SIZE      (1 << BUCKET_SHIFT)
 970 #define BUCKET_NUM(addr) ((((addr) - SUN4C_LOCK_VADDR) >> BUCKET_SHIFT))
 971 #define BUCKET_ADDR(num) (((num) << BUCKET_SHIFT) + SUN4C_LOCK_VADDR)
 972 #define BUCKET_PTE(page)       \
 973         ((((page) - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(SUN4C_PAGE_KERNEL))
 974 #define BUCKET_PTE_PAGE(pte)   \
 975         (PAGE_OFFSET + (((pte) & SUN4C_PFN_MASK) << PAGE_SHIFT))
 976
 977 static void get_locked_segment(unsigned long addr)
 978 {
 979         struct sun4c_mmu_entry *stolen;
 980         unsigned long flags;
 981
 982         local_irq_save(flags);
 983         addr &= SUN4C_REAL_PGDIR_MASK;
 984         stolen = sun4c_user_strategy();
 985         max_user_taken_entries--;
 986         stolen->vaddr = addr;
 987         flush_user_windows();
 988         sun4c_kernel_map(stolen);
 989         local_irq_restore(flags);
 990 }
 991
 992 static void free_locked_segment(unsigned long addr)
 993 {
 994         struct sun4c_mmu_entry *entry;
 995         unsigned long flags;
 996         unsigned char pseg;
 997
 998         local_irq_save(flags);
 999         addr &= SUN4C_REAL_PGDIR_MASK;
1000         pseg = sun4c_get_segmap(addr);
1001         entry = &mmu_entry_pool[pseg];
1002
1003         flush_user_windows();
1004         sun4c_flush_segment(addr);
1005         sun4c_kernel_unmap(entry);
1006         add_ring(&sun4c_ufree_ring, entry);
1007         max_user_taken_entries++;
1008         local_irq_restore(flags);
1009 }
1010
1011 static inline void garbage_collect(int entry)
1012 {
1013         int start, end;
1014
1015         /* 32 buckets per segment... */
1016         entry &= ~31;
1017         start = entry;
1018         for (end = (start + 32); start < end; start++)
1019                 if (sun4c_bucket[start] != BUCKET_EMPTY)
1020                         return;
1021
1022         /* Entire segment empty, release it. */
1023         free_locked_segment(BUCKET_ADDR(entry));
1024 }
1025
1026 static struct thread_info *sun4c_alloc_thread_info(void)
1027 {
1028         unsigned long addr, pages;
1029         int entry;
1030
1031         pages = __get_free_pages(GFP_KERNEL, THREAD_INFO_ORDER);
1032         if (!pages)
1033                 return NULL;
1034
1035         for (entry = sun4c_lowbucket_avail; entry < NR_TASK_BUCKETS; entry++)
1036                 if (sun4c_bucket[entry] == BUCKET_EMPTY)
1037                         break;
1038         if (entry == NR_TASK_BUCKETS) {
1039                 free_pages(pages, THREAD_INFO_ORDER);
1040                 return NULL;
1041         }
1042         if (entry >= sun4c_lowbucket_avail)
1043                 sun4c_lowbucket_avail = entry + 1;
1044
1045         addr = BUCKET_ADDR(entry);
1046         sun4c_bucket[entry] = (union task_union *) addr;
1047         if(sun4c_get_segmap(addr) == invalid_segment)
1048                 get_locked_segment(addr);
1049
1050         /* We are changing the virtual color of the page(s)
1051          * so we must flush the cache to guarantee consistency.
1052          */
1053         sun4c_flush_page(pages);
1054 #ifndef CONFIG_SUN4
1055         sun4c_flush_page(pages + PAGE_SIZE);
1056 #endif
1057
1058         sun4c_put_pte(addr, BUCKET_PTE(pages));
1059 #ifndef CONFIG_SUN4
1060         sun4c_put_pte(addr + PAGE_SIZE, BUCKET_PTE(pages + PAGE_SIZE));
1061 #endif
1062
1063 #ifdef CONFIG_DEBUG_STACK_USAGE
1064         memset((void *)addr, 0, PAGE_SIZE << THREAD_INFO_ORDER);
1065 #endif /* DEBUG_STACK_USAGE */
1066
1067         return (struct thread_info *) addr;
1068 }
1069
1070 static void sun4c_free_thread_info(struct thread_info *ti)
1071 {
1072         unsigned long tiaddr = (unsigned long) ti;
1073         unsigned long pages = BUCKET_PTE_PAGE(sun4c_get_pte(tiaddr));
1074         int entry = BUCKET_NUM(tiaddr);
1075
1076         /* We are deleting a mapping, so the flush here is mandatory. */
1077         sun4c_flush_page(tiaddr);
1078 #ifndef CONFIG_SUN4
1079         sun4c_flush_page(tiaddr + PAGE_SIZE);
1080 #endif
1081         sun4c_put_pte(tiaddr, 0);
1082 #ifndef CONFIG_SUN4
1083         sun4c_put_pte(tiaddr + PAGE_SIZE, 0);
1084 #endif
1085         sun4c_bucket[entry] = BUCKET_EMPTY;
1086         if (entry < sun4c_lowbucket_avail)
1087                 sun4c_lowbucket_avail = entry;
1088
1089         free_pages(pages, THREAD_INFO_ORDER);
1090         garbage_collect(entry);
1091 }
1092
1093 static void __init sun4c_init_buckets(void)
1094 {
1095         int entry;
1096
1097         if (sizeof(union thread_union) != (PAGE_SIZE << THREAD_INFO_ORDER)) {
1098                 extern void thread_info_size_is_bolixed_pete(void);
1099                 thread_info_size_is_bolixed_pete();
1100         }
1101
1102         for (entry = 0; entry < NR_TASK_BUCKETS; entry++)
1103                 sun4c_bucket[entry] = BUCKET_EMPTY;
1104         sun4c_lowbucket_avail = 0;
1105 }
1106
1107 static unsigned long sun4c_iobuffer_start;
1108 static unsigned long sun4c_iobuffer_end;
1109 static unsigned long sun4c_iobuffer_high;
1110 static unsigned long *sun4c_iobuffer_map;
1111 static int iobuffer_map_size;
1112
1113 /*
1114  * Alias our pages so they do not cause a trap.
1115  * Also one page may be aliased into several I/O areas and we may
1116  * finish these I/O separately.
1117  */
1118 static char *sun4c_lockarea(char *vaddr, unsigned long size)
1119 {
1120         unsigned long base, scan;
1121         unsigned long npages;
1122         unsigned long vpage;
1123         unsigned long pte;
1124         unsigned long apage;
1125         unsigned long high;
1126         unsigned long flags;
1127
1128         npages = (((unsigned long)vaddr & ~PAGE_MASK) +
1129                   size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
1130
1131         scan = 0;
1132         local_irq_save(flags);
1133         for (;;) {
1134                 scan = find_next_zero_bit(sun4c_iobuffer_map,
1135                                           iobuffer_map_size, scan);
1136                 if ((base = scan) + npages > iobuffer_map_size) goto abend;
1137                 for (;;) {
1138                         if (scan >= base + npages) goto found;
1139                         if (test_bit(scan, sun4c_iobuffer_map)) break;
1140                         scan++;
1141                 }
1142         }
1143
1144 found:
1145         high = ((base + npages) << PAGE_SHIFT) + sun4c_iobuffer_start;
1146         high = SUN4C_REAL_PGDIR_ALIGN(high);
1147         while (high > sun4c_iobuffer_high) {
1148                 get_locked_segment(sun4c_iobuffer_high);
1149                 sun4c_iobuffer_high += SUN4C_REAL_PGDIR_SIZE;
1150         }
1151
1152         vpage = ((unsigned long) vaddr) & PAGE_MASK;
1153         for (scan = base; scan < base+npages; scan++) {
1154                 pte = ((vpage-PAGE_OFFSET) >> PAGE_SHIFT);
1155                 pte |= pgprot_val(SUN4C_PAGE_KERNEL);
1156                 pte |= _SUN4C_PAGE_NOCACHE;
1157                 set_bit(scan, sun4c_iobuffer_map);
1158                 apage = (scan << PAGE_SHIFT) + sun4c_iobuffer_start;
1159
1160                 /* Flush original mapping so we see the right things later. */
1161                 sun4c_flush_page(vpage);
1162
1163                 sun4c_put_pte(apage, pte);
1164                 vpage += PAGE_SIZE;
1165         }
1166         local_irq_restore(flags);
1167         return (char *) ((base << PAGE_SHIFT) + sun4c_iobuffer_start +
1168                          (((unsigned long) vaddr) & ~PAGE_MASK));
1169
1170 abend:
1171         local_irq_restore(flags);
1172         printk("DMA vaddr=0x%p size=%08lx\n", vaddr, size);
1173         panic("Out of iobuffer table");
1174         return NULL;
1175 }
1176
1177 static void sun4c_unlockarea(char *vaddr, unsigned long size)
1178 {
1179         unsigned long vpage, npages;
1180         unsigned long flags;
1181         int scan, high;
1182
1183         vpage = (unsigned long)vaddr & PAGE_MASK;
1184         npages = (((unsigned long)vaddr & ~PAGE_MASK) +
1185                   size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
1186
1187         local_irq_save(flags);
1188         while (npages != 0) {
1189                 --npages;
1190
1191                 /* This mapping is marked non-cachable, no flush necessary. */
1192                 sun4c_put_pte(vpage, 0);
1193                 clear_bit((vpage - sun4c_iobuffer_start) >> PAGE_SHIFT,
1194                           sun4c_iobuffer_map);
1195                 vpage += PAGE_SIZE;
1196         }
1197
1198         /* garbage collect */
1199         scan = (sun4c_iobuffer_high - sun4c_iobuffer_start) >> PAGE_SHIFT;
1200         while (scan >= 0 && !sun4c_iobuffer_map[scan >> 5])
1201                 scan -= 32;
1202         scan += 32;
1203         high = sun4c_iobuffer_start + (scan << PAGE_SHIFT);
1204         high = SUN4C_REAL_PGDIR_ALIGN(high) + SUN4C_REAL_PGDIR_SIZE;
1205         while (high < sun4c_iobuffer_high) {
1206                 sun4c_iobuffer_high -= SUN4C_REAL_PGDIR_SIZE;
1207                 free_locked_segment(sun4c_iobuffer_high);
1208         }
1209         local_irq_restore(flags);
1210 }
1211
1212 /* Note the scsi code at init time passes to here buffers
1213  * which sit on the kernel stack, those are already locked
1214  * by implication and fool the page locking code above
1215  * if passed to by mistake.
1216  */
1217 static __u32 sun4c_get_scsi_one(char *bufptr, unsigned long len, struct sbus_bus *sbus)
1218 {
1219         unsigned long page;
1220
1221         page = ((unsigned long)bufptr) & PAGE_MASK;
1222         if (!virt_addr_valid(page)) {
1223                 sun4c_flush_page(page);
1224                 return (__u32)bufptr; /* already locked */
1225         }
1226         return (__u32)sun4c_lockarea(bufptr, len);
1227 }
1228
1229 static void sun4c_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
1230 {
1231         while (sz != 0) {
1232                 --sz;
1233                 sg[sz].dvma_address = (__u32)sun4c_lockarea(page_address(sg[sz].page) + sg[sz].offset, sg[sz].length);
1234                 sg[sz].dvma_length = sg[sz].length;
1235         }
1236 }
1237
1238 static void sun4c_release_scsi_one(__u32 bufptr, unsigned long len, struct sbus_bus *sbus)
1239 {
1240         if (bufptr < sun4c_iobuffer_start)
1241                 return; /* On kernel stack or similar, see above */
1242         sun4c_unlockarea((char *)bufptr, len);
1243 }
1244
1245 static void sun4c_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
1246 {
1247         while (sz != 0) {
1248                 --sz;
1249                 sun4c_unlockarea((char *)sg[sz].dvma_address, sg[sz].length);
1250         }
1251 }
1252
1253 #define TASK_ENTRY_SIZE    BUCKET_SIZE /* see above */
1254 #define LONG_ALIGN(x) (((x)+(sizeof(long))-1)&~((sizeof(long))-1))
1255
1256 struct vm_area_struct sun4c_kstack_vma;
1257
1258 static void __init sun4c_init_lock_areas(void)
1259 {
1260         unsigned long sun4c_taskstack_start;
1261         unsigned long sun4c_taskstack_end;
1262         int bitmap_size;
1263
1264         sun4c_init_buckets();
1265         sun4c_taskstack_start = SUN4C_LOCK_VADDR;
1266         sun4c_taskstack_end = (sun4c_taskstack_start +
1267                                (TASK_ENTRY_SIZE * NR_TASK_BUCKETS));
1268         if (sun4c_taskstack_end >= SUN4C_LOCK_END) {
1269                 prom_printf("Too many tasks, decrease NR_TASK_BUCKETS please.\n");
1270                 prom_halt();
1271         }
1272
1273         sun4c_iobuffer_start = sun4c_iobuffer_high =
1274                                 SUN4C_REAL_PGDIR_ALIGN(sun4c_taskstack_end);
1275         sun4c_iobuffer_end = SUN4C_LOCK_END;
1276         bitmap_size = (sun4c_iobuffer_end - sun4c_iobuffer_start) >> PAGE_SHIFT;
1277         bitmap_size = (bitmap_size + 7) >> 3;
1278         bitmap_size = LONG_ALIGN(bitmap_size);
1279         iobuffer_map_size = bitmap_size << 3;
1280         sun4c_iobuffer_map = __alloc_bootmem(bitmap_size, SMP_CACHE_BYTES, 0UL);
1281         memset((void *) sun4c_iobuffer_map, 0, bitmap_size);
1282
1283         sun4c_kstack_vma.vm_mm = &init_mm;
1284         sun4c_kstack_vma.vm_start = sun4c_taskstack_start;
1285         sun4c_kstack_vma.vm_end = sun4c_taskstack_end;
1286         sun4c_kstack_vma.vm_page_prot = PAGE_SHARED;
1287         sun4c_kstack_vma.vm_flags = VM_READ | VM_WRITE | VM_EXEC;
1288         insert_vm_struct(&init_mm, &sun4c_kstack_vma);
1289 }
1290
1291 /* Cache flushing on the sun4c. */
1292 static void sun4c_flush_cache_all(void)
1293 {
1294         unsigned long begin, end;
1295
1296         flush_user_windows();
1297         begin = (KERNBASE + SUN4C_REAL_PGDIR_SIZE);
1298         end = (begin + SUN4C_VAC_SIZE);
1299
1300         if (sun4c_vacinfo.linesize == 32) {
1301                 while (begin < end) {
1302                         __asm__ __volatile__(
1303                         "ld     [%0 + 0x00], %%g0\n\t"
1304                         "ld     [%0 + 0x20], %%g0\n\t"
1305                         "ld     [%0 + 0x40], %%g0\n\t"
1306                         "ld     [%0 + 0x60], %%g0\n\t"
1307                         "ld     [%0 + 0x80], %%g0\n\t"
1308                         "ld     [%0 + 0xa0], %%g0\n\t"
1309                         "ld     [%0 + 0xc0], %%g0\n\t"
1310                         "ld     [%0 + 0xe0], %%g0\n\t"
1311                         "ld     [%0 + 0x100], %%g0\n\t"
1312                         "ld     [%0 + 0x120], %%g0\n\t"
1313                         "ld     [%0 + 0x140], %%g0\n\t"
1314                         "ld     [%0 + 0x160], %%g0\n\t"
1315                         "ld     [%0 + 0x180], %%g0\n\t"
1316                         "ld     [%0 + 0x1a0], %%g0\n\t"
1317                         "ld     [%0 + 0x1c0], %%g0\n\t"
1318                         "ld     [%0 + 0x1e0], %%g0\n"
1319                         : : "r" (begin));
1320                         begin += 512;
1321                 }
1322         } else {
1323                 while (begin < end) {
1324                         __asm__ __volatile__(
1325                         "ld     [%0 + 0x00], %%g0\n\t"
1326                         "ld     [%0 + 0x10], %%g0\n\t"
1327                         "ld     [%0 + 0x20], %%g0\n\t"
1328                         "ld     [%0 + 0x30], %%g0\n\t"
1329                         "ld     [%0 + 0x40], %%g0\n\t"
1330                         "ld     [%0 + 0x50], %%g0\n\t"
1331                         "ld     [%0 + 0x60], %%g0\n\t"
1332                         "ld     [%0 + 0x70], %%g0\n\t"
1333                         "ld     [%0 + 0x80], %%g0\n\t"
1334                         "ld     [%0 + 0x90], %%g0\n\t"
1335                         "ld     [%0 + 0xa0], %%g0\n\t"
1336                         "ld     [%0 + 0xb0], %%g0\n\t"
1337                         "ld     [%0 + 0xc0], %%g0\n\t"
1338                         "ld     [%0 + 0xd0], %%g0\n\t"
1339                         "ld     [%0 + 0xe0], %%g0\n\t"
1340                         "ld     [%0 + 0xf0], %%g0\n"
1341                         : : "r" (begin));
1342                         begin += 256;
1343                 }
1344         }
1345 }
1346
1347 static void sun4c_flush_cache_mm(struct mm_struct *mm)
1348 {
1349         int new_ctx = mm->context;
1350
1351         if (new_ctx != NO_CONTEXT) {
1352                 flush_user_windows();
1353
1354                 if (sun4c_context_ring[new_ctx].num_entries) {
1355                         struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1356                         unsigned long flags;
1357
1358                         local_irq_save(flags);
1359                         if (head->next != head) {
1360                                 struct sun4c_mmu_entry *entry = head->next;
1361                                 int savectx = sun4c_get_context();
1362
1363                                 sun4c_set_context(new_ctx);
1364                                 sun4c_flush_context();
1365                                 do {
1366                                         struct sun4c_mmu_entry *next = entry->next;
1367
1368                                         sun4c_user_unmap(entry);
1369                                         free_user_entry(new_ctx, entry);
1370
1371                                         entry = next;
1372                                 } while (entry != head);
1373                                 sun4c_set_context(savectx);
1374                         }
1375                         local_irq_restore(flags);
1376                 }
1377         }
1378 }
1379
1380 static void sun4c_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
1381 {
1382         struct mm_struct *mm = vma->vm_mm;
1383         int new_ctx = mm->context;
1384
1385         if (new_ctx != NO_CONTEXT) {
1386                 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1387                 struct sun4c_mmu_entry *entry;
1388                 unsigned long flags;
1389
1390                 flush_user_windows();
1391
1392                 local_irq_save(flags);
1393                 /* All user segmap chains are ordered on entry->vaddr. */
1394                 for (entry = head->next;
1395                      (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start);
1396                      entry = entry->next)
1397                         ;
1398
1399                 /* Tracing various job mixtures showed that this conditional
1400                  * only passes ~35% of the time for most worse case situations,
1401                  * therefore we avoid all of this gross overhead ~65% of the time.
1402                  */
1403                 if ((entry != head) && (entry->vaddr < end)) {
1404                         int octx = sun4c_get_context();
1405                         sun4c_set_context(new_ctx);
1406
1407                         /* At this point, always, (start >= entry->vaddr) and
1408                          * (entry->vaddr < end), once the latter condition
1409                          * ceases to hold, or we hit the end of the list, we
1410                          * exit the loop.  The ordering of all user allocated
1411                          * segmaps makes this all work out so beautifully.
1412                          */
1413                         do {
1414                                 struct sun4c_mmu_entry *next = entry->next;
1415                                 unsigned long realend;
1416
1417                                 /* "realstart" is always >= entry->vaddr */
1418                                 realend = entry->vaddr + SUN4C_REAL_PGDIR_SIZE;
1419                                 if (end < realend)
1420                                         realend = end;
1421                                 if ((realend - entry->vaddr) <= (PAGE_SIZE << 3)) {
1422                                         unsigned long page = entry->vaddr;
1423                                         while (page < realend) {
1424                                                 sun4c_flush_page(page);
1425                                                 page += PAGE_SIZE;
1426                                         }
1427                                 } else {
1428                                         sun4c_flush_segment(entry->vaddr);
1429                                         sun4c_user_unmap(entry);
1430                                         free_user_entry(new_ctx, entry);
1431                                 }
1432                                 entry = next;
1433                         } while ((entry != head) && (entry->vaddr < end));
1434                         sun4c_set_context(octx);
1435                 }
1436                 local_irq_restore(flags);
1437         }
1438 }
1439
1440 static void sun4c_flush_cache_page(struct vm_area_struct *vma, unsigned long page)
1441 {
1442         struct mm_struct *mm = vma->vm_mm;
1443         int new_ctx = mm->context;
1444
1445         /* Sun4c has no separate I/D caches so cannot optimize for non
1446          * text page flushes.
1447          */
1448         if (new_ctx != NO_CONTEXT) {
1449                 int octx = sun4c_get_context();
1450                 unsigned long flags;
1451
1452                 flush_user_windows();
1453                 local_irq_save(flags);
1454                 sun4c_set_context(new_ctx);
1455                 sun4c_flush_page(page);
1456                 sun4c_set_context(octx);
1457                 local_irq_restore(flags);
1458         }
1459 }
1460
1461 static void sun4c_flush_page_to_ram(unsigned long page)
1462 {
1463         unsigned long flags;
1464
1465         local_irq_save(flags);
1466         sun4c_flush_page(page);
1467         local_irq_restore(flags);
1468 }
1469
1470 /* Sun4c cache is unified, both instructions and data live there, so
1471  * no need to flush the on-stack instructions for new signal handlers.
1472  */
1473 static void sun4c_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
1474 {
1475 }
1476
1477 /* TLB flushing on the sun4c.  These routines count on the cache
1478  * flushing code to flush the user register windows so that we need
1479  * not do so when we get here.
1480  */
1481
1482 static void sun4c_flush_tlb_all(void)
1483 {
1484         struct sun4c_mmu_entry *this_entry, *next_entry;
1485         unsigned long flags;
1486         int savectx, ctx;
1487
1488         local_irq_save(flags);
1489         this_entry = sun4c_kernel_ring.ringhd.next;
1490         savectx = sun4c_get_context();
1491         flush_user_windows();
1492         while (sun4c_kernel_ring.num_entries) {
1493                 next_entry = this_entry->next;
1494                 sun4c_flush_segment(this_entry->vaddr);
1495                 for (ctx = 0; ctx < num_contexts; ctx++) {
1496                         sun4c_set_context(ctx);
1497                         sun4c_put_segmap(this_entry->vaddr, invalid_segment);
1498                 }
1499                 free_kernel_entry(this_entry, &sun4c_kernel_ring);
1500                 this_entry = next_entry;
1501         }
1502         sun4c_set_context(savectx);
1503         local_irq_restore(flags);
1504 }
1505
1506 static void sun4c_flush_tlb_mm(struct mm_struct *mm)
1507 {
1508         int new_ctx = mm->context;
1509
1510         if (new_ctx != NO_CONTEXT) {
1511                 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1512                 unsigned long flags;
1513
1514                 local_irq_save(flags);
1515                 if (head->next != head) {
1516                         struct sun4c_mmu_entry *entry = head->next;
1517                         int savectx = sun4c_get_context();
1518
1519                         sun4c_set_context(new_ctx);
1520                         sun4c_flush_context();
1521                         do {
1522                                 struct sun4c_mmu_entry *next = entry->next;
1523
1524                                 sun4c_user_unmap(entry);
1525                                 free_user_entry(new_ctx, entry);
1526
1527                                 entry = next;
1528                         } while (entry != head);
1529                         sun4c_set_context(savectx);
1530                 }
1531                 local_irq_restore(flags);
1532         }
1533 }
1534
1535 static void sun4c_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
1536 {
1537         struct mm_struct *mm = vma->vm_mm;
1538         int new_ctx = mm->context;
1539
1540         if (new_ctx != NO_CONTEXT) {
1541                 struct sun4c_mmu_entry *head = &sun4c_context_ring[new_ctx].ringhd;
1542                 struct sun4c_mmu_entry *entry;
1543                 unsigned long flags;
1544
1545                 local_irq_save(flags);
1546                 /* See commentary in sun4c_flush_cache_range(). */
1547                 for (entry = head->next;
1548                      (entry != head) && ((entry->vaddr+SUN4C_REAL_PGDIR_SIZE) < start);
1549                      entry = entry->next)
1550                         ;
1551
1552                 if ((entry != head) && (entry->vaddr < end)) {
1553                         int octx = sun4c_get_context();
1554
1555                         sun4c_set_context(new_ctx);
1556                         do {
1557                                 struct sun4c_mmu_entry *next = entry->next;
1558
1559                                 sun4c_flush_segment(entry->vaddr);
1560                                 sun4c_user_unmap(entry);
1561                                 free_user_entry(new_ctx, entry);
1562
1563                                 entry = next;
1564                         } while ((entry != head) && (entry->vaddr < end));
1565                         sun4c_set_context(octx);
1566                 }
1567                 local_irq_restore(flags);
1568         }
1569 }
1570
1571 static void sun4c_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
1572 {
1573         struct mm_struct *mm = vma->vm_mm;
1574         int new_ctx = mm->context;
1575
1576         if (new_ctx != NO_CONTEXT) {
1577                 int savectx = sun4c_get_context();
1578                 unsigned long flags;
1579
1580                 local_irq_save(flags);
1581                 sun4c_set_context(new_ctx);
1582                 page &= PAGE_MASK;
1583                 sun4c_flush_page(page);
1584                 sun4c_put_pte(page, 0);
1585                 sun4c_set_context(savectx);
1586                 local_irq_restore(flags);
1587         }
1588 }
1589
1590 static inline void sun4c_mapioaddr(unsigned long physaddr, unsigned long virt_addr)
1591 {
1592         unsigned long page_entry, pg_iobits;
1593
1594         pg_iobits = _SUN4C_PAGE_PRESENT | _SUN4C_READABLE | _SUN4C_WRITEABLE |
1595                     _SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE;
1596
1597         page_entry = ((physaddr >> PAGE_SHIFT) & SUN4C_PFN_MASK);
1598         page_entry |= ((pg_iobits | _SUN4C_PAGE_PRIV) & ~(_SUN4C_PAGE_PRESENT));
1599         sun4c_put_pte(virt_addr, page_entry);
1600 }
1601
1602 static void sun4c_mapiorange(unsigned int bus, unsigned long xpa,
1603     unsigned long xva, unsigned int len)
1604 {
1605         while (len != 0) {
1606                 len -= PAGE_SIZE;
1607                 sun4c_mapioaddr(xpa, xva);
1608                 xva += PAGE_SIZE;
1609                 xpa += PAGE_SIZE;
1610         }
1611 }
1612
1613 static void sun4c_unmapiorange(unsigned long virt_addr, unsigned int len)
1614 {
1615         while (len != 0) {
1616                 len -= PAGE_SIZE;
1617                 sun4c_put_pte(virt_addr, 0);
1618                 virt_addr += PAGE_SIZE;
1619         }
1620 }
1621
1622 static void sun4c_alloc_context(struct mm_struct *old_mm, struct mm_struct *mm)
1623 {
1624         struct ctx_list *ctxp;
1625
1626         ctxp = ctx_free.next;
1627         if (ctxp != &ctx_free) {
1628                 remove_from_ctx_list(ctxp);
1629                 add_to_used_ctxlist(ctxp);
1630                 mm->context = ctxp->ctx_number;
1631                 ctxp->ctx_mm = mm;
1632                 return;
1633         }
1634         ctxp = ctx_used.next;
1635         if (ctxp->ctx_mm == old_mm)
1636                 ctxp = ctxp->next;
1637         remove_from_ctx_list(ctxp);
1638         add_to_used_ctxlist(ctxp);
1639         ctxp->ctx_mm->context = NO_CONTEXT;
1640         ctxp->ctx_mm = mm;
1641         mm->context = ctxp->ctx_number;
1642         sun4c_demap_context(&sun4c_context_ring[ctxp->ctx_number],
1643                                ctxp->ctx_number);
1644 }
1645
1646 /* Switch the current MM context. */
1647 static void sun4c_switch_mm(struct mm_struct *old_mm, struct mm_struct *mm, struct task_struct *tsk, int cpu)
1648 {
1649         struct ctx_list *ctx;
1650         int dirty = 0;
1651
1652         if (mm->context == NO_CONTEXT) {
1653                 dirty = 1;
1654                 sun4c_alloc_context(old_mm, mm);
1655         } else {
1656                 /* Update the LRU ring of contexts. */
1657                 ctx = ctx_list_pool + mm->context;
1658                 remove_from_ctx_list(ctx);
1659                 add_to_used_ctxlist(ctx);
1660         }
1661         if (dirty || old_mm != mm)
1662                 sun4c_set_context(mm->context);
1663 }
1664
1665 static void sun4c_destroy_context(struct mm_struct *mm)
1666 {
1667         struct ctx_list *ctx_old;
1668
1669         if (mm->context != NO_CONTEXT) {
1670                 sun4c_demap_context(&sun4c_context_ring[mm->context], mm->context);
1671                 ctx_old = ctx_list_pool + mm->context;
1672                 remove_from_ctx_list(ctx_old);
1673                 add_to_free_ctxlist(ctx_old);
1674                 mm->context = NO_CONTEXT;
1675         }
1676 }
1677
1678 static void sun4c_mmu_info(struct seq_file *m)
1679 {
1680         int used_user_entries, i;
1681
1682         used_user_entries = 0;
1683         for (i = 0; i < num_contexts; i++)
1684                 used_user_entries += sun4c_context_ring[i].num_entries;
1685
1686         seq_printf(m,
1687                    "vacsize\t\t: %d bytes\n"
1688                    "vachwflush\t: %s\n"
1689                    "vaclinesize\t: %d bytes\n"
1690                    "mmuctxs\t\t: %d\n"
1691                    "mmupsegs\t: %d\n"
1692                    "kernelpsegs\t: %d\n"
1693                    "kfreepsegs\t: %d\n"
1694                    "usedpsegs\t: %d\n"
1695                    "ufreepsegs\t: %d\n"
1696                    "user_taken\t: %d\n"
1697                    "max_taken\t: %d\n",
1698                    sun4c_vacinfo.num_bytes,
1699                    (sun4c_vacinfo.do_hwflushes ? "yes" : "no"),
1700                    sun4c_vacinfo.linesize,
1701                    num_contexts,
1702                    (invalid_segment + 1),
1703                    sun4c_kernel_ring.num_entries,
1704                    sun4c_kfree_ring.num_entries,
1705                    used_user_entries,
1706                    sun4c_ufree_ring.num_entries,
1707                    sun4c_user_taken_entries,
1708                    max_user_taken_entries);
1709 }
1710
1711 /* Nothing below here should touch the mmu hardware nor the mmu_entry
1712  * data structures.
1713  */
1714
1715 /* First the functions which the mid-level code uses to directly
1716  * manipulate the software page tables.  Some defines since we are
1717  * emulating the i386 page directory layout.
1718  */
1719 #define PGD_PRESENT  0x001
1720 #define PGD_RW       0x002
1721 #define PGD_USER     0x004
1722 #define PGD_ACCESSED 0x020
1723 #define PGD_DIRTY    0x040
1724 #define PGD_TABLE    (PGD_PRESENT | PGD_RW | PGD_USER | PGD_ACCESSED | PGD_DIRTY)
1725
1726 static void sun4c_set_pte(pte_t *ptep, pte_t pte)
1727 {
1728         *ptep = pte;
1729 }
1730
1731 static void sun4c_pgd_set(pgd_t * pgdp, pmd_t * pmdp)
1732 {
1733 }
1734
1735 static void sun4c_pmd_set(pmd_t * pmdp, pte_t * ptep)
1736 {
1737         pmdp->pmdv[0] = PGD_TABLE | (unsigned long) ptep;
1738 }
1739
1740 static void sun4c_pmd_populate(pmd_t * pmdp, struct page * ptep)
1741 {
1742         if (page_address(ptep) == NULL) BUG();  /* No highmem on sun4c */
1743         pmdp->pmdv[0] = PGD_TABLE | (unsigned long) page_address(ptep);
1744 }
1745
1746 static int sun4c_pte_present(pte_t pte)
1747 {
1748         return ((pte_val(pte) & (_SUN4C_PAGE_PRESENT | _SUN4C_PAGE_PRIV)) != 0);
1749 }
1750 static void sun4c_pte_clear(pte_t *ptep)        { *ptep = __pte(0); }
1751
1752 static int sun4c_pte_read(pte_t pte)
1753 {
1754         return (pte_val(pte) & _SUN4C_PAGE_READ);
1755 }
1756
1757 static int sun4c_pmd_bad(pmd_t pmd)
1758 {
1759         return (((pmd_val(pmd) & ~PAGE_MASK) != PGD_TABLE) ||
1760                 (!virt_addr_valid(pmd_val(pmd))));
1761 }
1762
1763 static int sun4c_pmd_present(pmd_t pmd)
1764 {
1765         return ((pmd_val(pmd) & PGD_PRESENT) != 0);
1766 }
1767
1768 #if 0 /* if PMD takes one word */
1769 static void sun4c_pmd_clear(pmd_t *pmdp)        { *pmdp = __pmd(0); }
1770 #else /* if pmd_t is a longish aggregate */
1771 static void sun4c_pmd_clear(pmd_t *pmdp) {
1772         memset((void *)pmdp, 0, sizeof(pmd_t));
1773 }
1774 #endif
1775
1776 static int sun4c_pgd_none(pgd_t pgd)            { return 0; }
1777 static int sun4c_pgd_bad(pgd_t pgd)             { return 0; }
1778 static int sun4c_pgd_present(pgd_t pgd)         { return 1; }
1779 static void sun4c_pgd_clear(pgd_t * pgdp)       { }
1780
1781 /*
1782  * The following only work if pte_present() is true.
1783  * Undefined behaviour if not..
1784  */
1785 static pte_t sun4c_pte_mkwrite(pte_t pte)
1786 {
1787         pte = __pte(pte_val(pte) | _SUN4C_PAGE_WRITE);
1788         if (pte_val(pte) & _SUN4C_PAGE_MODIFIED)
1789                 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
1790         return pte;
1791 }
1792
1793 static pte_t sun4c_pte_mkdirty(pte_t pte)
1794 {
1795         pte = __pte(pte_val(pte) | _SUN4C_PAGE_MODIFIED);
1796         if (pte_val(pte) & _SUN4C_PAGE_WRITE)
1797                 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
1798         return pte;
1799 }
1800
1801 static pte_t sun4c_pte_mkyoung(pte_t pte)
1802 {
1803         pte = __pte(pte_val(pte) | _SUN4C_PAGE_ACCESSED);
1804         if (pte_val(pte) & _SUN4C_PAGE_READ)
1805                 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_READ);
1806         return pte;
1807 }
1808
1809 /*
1810  * Conversion functions: convert a page and protection to a page entry,
1811  * and a page entry and page directory to the page they refer to.
1812  */
1813 static pte_t sun4c_mk_pte(struct page *page, pgprot_t pgprot)
1814 {
1815         return __pte(page_to_pfn(page) | pgprot_val(pgprot));
1816 }
1817
1818 static pte_t sun4c_mk_pte_phys(unsigned long phys_page, pgprot_t pgprot)
1819 {
1820         return __pte((phys_page >> PAGE_SHIFT) | pgprot_val(pgprot));
1821 }
1822
1823 static pte_t sun4c_mk_pte_io(unsigned long page, pgprot_t pgprot, int space)
1824 {
1825         return __pte(((page - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(pgprot));
1826 }
1827
1828 static unsigned long sun4c_pte_pfn(pte_t pte)
1829 {
1830         return pte_val(pte) & SUN4C_PFN_MASK;
1831 }
1832
1833 static pte_t sun4c_pgoff_to_pte(unsigned long pgoff)
1834 {
1835         return __pte(pgoff | _SUN4C_PAGE_FILE);
1836 }
1837
1838 static unsigned long sun4c_pte_to_pgoff(pte_t pte)
1839 {
1840         return pte_val(pte) & ((1UL << PTE_FILE_MAX_BITS) - 1);
1841 }
1842
1843
1844 static __inline__ unsigned long sun4c_pmd_page_v(pmd_t pmd)
1845 {
1846         return (pmd_val(pmd) & PAGE_MASK);
1847 }
1848
1849 static struct page *sun4c_pmd_page(pmd_t pmd)
1850 {
1851         return virt_to_page(sun4c_pmd_page_v(pmd));
1852 }
1853
1854 static unsigned long sun4c_pgd_page(pgd_t pgd) { return 0; }
1855
1856 /* to find an entry in a page-table-directory */
1857 static inline pgd_t *sun4c_pgd_offset(struct mm_struct * mm, unsigned long address)
1858 {
1859         return mm->pgd + (address >> SUN4C_PGDIR_SHIFT);
1860 }
1861
1862 /* Find an entry in the second-level page table.. */
1863 static pmd_t *sun4c_pmd_offset(pgd_t * dir, unsigned long address)
1864 {
1865         return (pmd_t *) dir;
1866 }
1867
1868 /* Find an entry in the third-level page table.. */
1869 pte_t *sun4c_pte_offset_kernel(pmd_t * dir, unsigned long address)
1870 {
1871         return (pte_t *) sun4c_pmd_page_v(*dir) +
1872                         ((address >> PAGE_SHIFT) & (SUN4C_PTRS_PER_PTE - 1));
1873 }
1874
1875 static unsigned long sun4c_swp_type(swp_entry_t entry)
1876 {
1877         return (entry.val & SUN4C_SWP_TYPE_MASK);
1878 }
1879
1880 static unsigned long sun4c_swp_offset(swp_entry_t entry)
1881 {
1882         return (entry.val >> SUN4C_SWP_OFF_SHIFT) & SUN4C_SWP_OFF_MASK;
1883 }
1884
1885 static swp_entry_t sun4c_swp_entry(unsigned long type, unsigned long offset)
1886 {
1887         return (swp_entry_t) {
1888                   (offset & SUN4C_SWP_OFF_MASK) << SUN4C_SWP_OFF_SHIFT
1889                 | (type & SUN4C_SWP_TYPE_MASK) };
1890 }
1891
1892 static void sun4c_free_pte_slow(pte_t *pte)
1893 {
1894         free_page((unsigned long)pte);
1895 }
1896
1897 static void sun4c_free_pgd_slow(pgd_t *pgd)
1898 {
1899         free_page((unsigned long)pgd);
1900 }
1901
1902 static pgd_t *sun4c_get_pgd_fast(void)
1903 {
1904         unsigned long *ret;
1905
1906         if ((ret = pgd_quicklist) != NULL) {
1907                 pgd_quicklist = (unsigned long *)(*ret);
1908                 ret[0] = ret[1];
1909                 pgtable_cache_size--;
1910         } else {
1911                 pgd_t *init;
1912
1913                 ret = (unsigned long *)__get_free_page(GFP_KERNEL);
1914                 memset (ret, 0, (KERNBASE / SUN4C_PGDIR_SIZE) * sizeof(pgd_t));
1915                 init = sun4c_pgd_offset(&init_mm, 0);
1916                 memcpy (((pgd_t *)ret) + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
1917                         (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
1918         }
1919         return (pgd_t *)ret;
1920 }
1921
1922 static void sun4c_free_pgd_fast(pgd_t *pgd)
1923 {
1924         *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
1925         pgd_quicklist = (unsigned long *) pgd;
1926         pgtable_cache_size++;
1927 }
1928
1929
1930 static __inline__ pte_t *
1931 sun4c_pte_alloc_one_fast(struct mm_struct *mm, unsigned long address)
1932 {
1933         unsigned long *ret;
1934
1935         if ((ret = (unsigned long *)pte_quicklist) != NULL) {
1936                 pte_quicklist = (unsigned long *)(*ret);
1937                 ret[0] = ret[1];
1938                 pgtable_cache_size--;
1939         }
1940         return (pte_t *)ret;
1941 }
1942
1943 static pte_t *sun4c_pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
1944 {
1945         pte_t *pte;
1946
1947         if ((pte = sun4c_pte_alloc_one_fast(mm, address)) != NULL)
1948                 return pte;
1949
1950         pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
1951         if (pte)
1952                 memset(pte, 0, PAGE_SIZE);
1953         return pte;
1954 }
1955
1956 static struct page *sun4c_pte_alloc_one(struct mm_struct *mm, unsigned long address)
1957 {
1958         pte_t *pte = sun4c_pte_alloc_one_kernel(mm, address);
1959         if (pte == NULL)
1960                 return NULL;
1961         return virt_to_page(pte);
1962 }
1963
1964 static __inline__ void sun4c_free_pte_fast(pte_t *pte)
1965 {
1966         *(unsigned long *)pte = (unsigned long) pte_quicklist;
1967         pte_quicklist = (unsigned long *) pte;
1968         pgtable_cache_size++;
1969 }
1970
1971 static void sun4c_pte_free(struct page *pte)
1972 {
1973         sun4c_free_pte_fast(page_address(pte));
1974 }
1975
1976 /*
1977  * allocating and freeing a pmd is trivial: the 1-entry pmd is
1978  * inside the pgd, so has no extra memory associated with it.
1979  */
1980 static pmd_t *sun4c_pmd_alloc_one(struct mm_struct *mm, unsigned long address)
1981 {
1982         BUG();
1983         return NULL;
1984 }
1985
1986 static void sun4c_free_pmd_fast(pmd_t * pmd) { }
1987
1988 static void sun4c_check_pgt_cache(int low, int high)
1989 {
1990         if (pgtable_cache_size > high) {
1991                 do {
1992                         if (pgd_quicklist)
1993                                 sun4c_free_pgd_slow(sun4c_get_pgd_fast());
1994                         if (pte_quicklist)
1995                                 sun4c_free_pte_slow(sun4c_pte_alloc_one_fast(NULL, 0));
1996                 } while (pgtable_cache_size > low);
1997         }
1998 }
1999
2000 /* An experiment, turn off by default for now... -DaveM */
2001 #define SUN4C_PRELOAD_PSEG
2002
2003 void sun4c_update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
2004 {
2005         unsigned long flags;
2006         int pseg;
2007
2008         local_irq_save(flags);
2009         address &= PAGE_MASK;
2010         if ((pseg = sun4c_get_segmap(address)) == invalid_segment) {
2011                 struct sun4c_mmu_entry *entry = sun4c_user_strategy();
2012                 struct mm_struct *mm = vma->vm_mm;
2013                 unsigned long start, end;
2014
2015                 entry->vaddr = start = (address & SUN4C_REAL_PGDIR_MASK);
2016                 entry->ctx = mm->context;
2017                 add_ring_ordered(sun4c_context_ring + mm->context, entry);
2018                 sun4c_put_segmap(entry->vaddr, entry->pseg);
2019                 end = start + SUN4C_REAL_PGDIR_SIZE;
2020                 while (start < end) {
2021 #ifdef SUN4C_PRELOAD_PSEG
2022                         pgd_t *pgdp = sun4c_pgd_offset(mm, start);
2023                         pte_t *ptep;
2024
2025                         if (!pgdp)
2026                                 goto no_mapping;
2027                         ptep = sun4c_pte_offset_kernel((pmd_t *) pgdp, start);
2028                         if (!ptep || !(pte_val(*ptep) & _SUN4C_PAGE_PRESENT))
2029                                 goto no_mapping;
2030                         sun4c_put_pte(start, pte_val(*ptep));
2031                         goto next;
2032
2033                 no_mapping:
2034 #endif
2035                         sun4c_put_pte(start, 0);
2036 #ifdef SUN4C_PRELOAD_PSEG
2037                 next:
2038 #endif
2039                         start += PAGE_SIZE;
2040                 }
2041 #ifndef SUN4C_PRELOAD_PSEG
2042                 sun4c_put_pte(address, pte_val(pte));
2043 #endif
2044                 local_irq_restore(flags);
2045                 return;
2046         } else {
2047                 struct sun4c_mmu_entry *entry = &mmu_entry_pool[pseg];
2048
2049                 remove_lru(entry);
2050                 add_lru(entry);
2051         }
2052
2053         sun4c_put_pte(address, pte_val(pte));
2054         local_irq_restore(flags);
2055 }
2056
2057 extern void sparc_context_init(int);
2058 extern unsigned long end;
2059 extern unsigned long bootmem_init(unsigned long *pages_avail);
2060 extern unsigned long last_valid_pfn;
2061
2062 void __init sun4c_paging_init(void)
2063 {
2064         int i, cnt;
2065         unsigned long kernel_end, vaddr;
2066         extern struct resource sparc_iomap;
2067         unsigned long end_pfn, pages_avail;
2068
2069         kernel_end = (unsigned long) &end;
2070         kernel_end += (SUN4C_REAL_PGDIR_SIZE * 4);
2071         kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end);
2072
2073         pages_avail = 0;
2074         last_valid_pfn = bootmem_init(&pages_avail);
2075         end_pfn = last_valid_pfn;
2076
2077         sun4c_probe_mmu();
2078         invalid_segment = (num_segmaps - 1);
2079         sun4c_init_mmu_entry_pool();
2080         sun4c_init_rings();
2081         sun4c_init_map_kernelprom(kernel_end);
2082         sun4c_init_clean_mmu(kernel_end);
2083         sun4c_init_fill_kernel_ring(SUN4C_KERNEL_BUCKETS);
2084         sun4c_init_lock_area(sparc_iomap.start, IOBASE_END);
2085         sun4c_init_lock_area(DVMA_VADDR, DVMA_END);
2086         sun4c_init_lock_areas();
2087         sun4c_init_fill_user_ring();
2088
2089         sun4c_set_context(0);
2090         memset(swapper_pg_dir, 0, PAGE_SIZE);
2091         memset(pg0, 0, PAGE_SIZE);
2092         memset(pg1, 0, PAGE_SIZE);
2093         memset(pg2, 0, PAGE_SIZE);
2094         memset(pg3, 0, PAGE_SIZE);
2095
2096         /* Save work later. */
2097         vaddr = VMALLOC_START;
2098         swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg0);
2099         vaddr += SUN4C_PGDIR_SIZE;
2100         swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg1);
2101         vaddr += SUN4C_PGDIR_SIZE;
2102         swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg2);
2103         vaddr += SUN4C_PGDIR_SIZE;
2104         swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg3);
2105         sun4c_init_ss2_cache_bug();
2106         sparc_context_init(num_contexts);
2107
2108         {
2109                 unsigned long zones_size[MAX_NR_ZONES];
2110                 unsigned long zholes_size[MAX_NR_ZONES];
2111                 unsigned long npages;
2112                 int znum;
2113
2114                 for (znum = 0; znum < MAX_NR_ZONES; znum++)
2115                         zones_size[znum] = zholes_size[znum] = 0;
2116
2117                 npages = max_low_pfn - pfn_base;
2118
2119                 zones_size[ZONE_DMA] = npages;
2120                 zholes_size[ZONE_DMA] = npages - pages_avail;
2121
2122                 npages = highend_pfn - max_low_pfn;
2123                 zones_size[ZONE_HIGHMEM] = npages;
2124                 zholes_size[ZONE_HIGHMEM] = npages - calc_highpages();
2125
2126                 free_area_init_node(0, &contig_page_data, zones_size,
2127                                     pfn_base, zholes_size);
2128         }
2129
2130         cnt = 0;
2131         for (i = 0; i < num_segmaps; i++)
2132                 if (mmu_entry_pool[i].locked)
2133                         cnt++;
2134
2135         max_user_taken_entries = num_segmaps - cnt - 40 - 1;
2136
2137         printk("SUN4C: %d mmu entries for the kernel\n", cnt);
2138 }
2139
2140 static pgprot_t sun4c_pgprot_noncached(pgprot_t prot)
2141 {
2142         prot |= __pgprot(_SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE);
2143
2144         return prot;
2145 }
2146
2147 /* Load up routines and constants for sun4c mmu */
2148 void __init ld_mmu_sun4c(void)
2149 {
2150         extern void ___xchg32_sun4c(void);
2151
2152         printk("Loading sun4c MMU routines\n");
2153
2154         /* First the constants */
2155         BTFIXUPSET_SIMM13(pgdir_shift, SUN4C_PGDIR_SHIFT);
2156         BTFIXUPSET_SETHI(pgdir_size, SUN4C_PGDIR_SIZE);
2157         BTFIXUPSET_SETHI(pgdir_mask, SUN4C_PGDIR_MASK);
2158
2159         BTFIXUPSET_SIMM13(ptrs_per_pmd, SUN4C_PTRS_PER_PMD);
2160         BTFIXUPSET_SIMM13(ptrs_per_pgd, SUN4C_PTRS_PER_PGD);
2161         BTFIXUPSET_SIMM13(user_ptrs_per_pgd, KERNBASE / SUN4C_PGDIR_SIZE);
2162
2163         BTFIXUPSET_INT(page_none, pgprot_val(SUN4C_PAGE_NONE));
2164         BTFIXUPSET_INT(page_shared, pgprot_val(SUN4C_PAGE_SHARED));
2165         BTFIXUPSET_INT(page_copy, pgprot_val(SUN4C_PAGE_COPY));
2166         BTFIXUPSET_INT(page_readonly, pgprot_val(SUN4C_PAGE_READONLY));
2167         BTFIXUPSET_INT(page_kernel, pgprot_val(SUN4C_PAGE_KERNEL));
2168         page_kernel = pgprot_val(SUN4C_PAGE_KERNEL);
2169
2170         /* Functions */
2171         BTFIXUPSET_CALL(pgprot_noncached, sun4c_pgprot_noncached, BTFIXUPCALL_NORM);
2172         BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4c, BTFIXUPCALL_NORM);
2173         BTFIXUPSET_CALL(do_check_pgt_cache, sun4c_check_pgt_cache, BTFIXUPCALL_NORM);
2174
2175         BTFIXUPSET_CALL(flush_cache_all, sun4c_flush_cache_all, BTFIXUPCALL_NORM);
2176
2177         if (sun4c_vacinfo.do_hwflushes) {
2178                 BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_hw, BTFIXUPCALL_NORM);
2179                 BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_hw, BTFIXUPCALL_NORM);
2180                 BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_hw, BTFIXUPCALL_NORM);
2181         } else {
2182                 BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_sw, BTFIXUPCALL_NORM);
2183                 BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_sw, BTFIXUPCALL_NORM);
2184                 BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_sw, BTFIXUPCALL_NORM);
2185         }
2186
2187         BTFIXUPSET_CALL(flush_tlb_mm, sun4c_flush_tlb_mm, BTFIXUPCALL_NORM);
2188         BTFIXUPSET_CALL(flush_cache_mm, sun4c_flush_cache_mm, BTFIXUPCALL_NORM);
2189         BTFIXUPSET_CALL(destroy_context, sun4c_destroy_context, BTFIXUPCALL_NORM);
2190         BTFIXUPSET_CALL(switch_mm, sun4c_switch_mm, BTFIXUPCALL_NORM);
2191         BTFIXUPSET_CALL(flush_cache_page, sun4c_flush_cache_page, BTFIXUPCALL_NORM);
2192         BTFIXUPSET_CALL(flush_tlb_page, sun4c_flush_tlb_page, BTFIXUPCALL_NORM);
2193         BTFIXUPSET_CALL(flush_tlb_range, sun4c_flush_tlb_range, BTFIXUPCALL_NORM);
2194         BTFIXUPSET_CALL(flush_cache_range, sun4c_flush_cache_range, BTFIXUPCALL_NORM);
2195         BTFIXUPSET_CALL(__flush_page_to_ram, sun4c_flush_page_to_ram, BTFIXUPCALL_NORM);
2196         BTFIXUPSET_CALL(flush_tlb_all, sun4c_flush_tlb_all, BTFIXUPCALL_NORM);
2197
2198         BTFIXUPSET_CALL(flush_sig_insns, sun4c_flush_sig_insns, BTFIXUPCALL_NOP);
2199
2200         BTFIXUPSET_CALL(set_pte, sun4c_set_pte, BTFIXUPCALL_STO1O0);
2201
2202         /* The 2.4.18 code does not set this on sun4c, how does it work? XXX */
2203         /* BTFIXUPSET_SETHI(none_mask, 0x00000000); */  /* Defaults to zero? */
2204
2205         BTFIXUPSET_CALL(pte_pfn, sun4c_pte_pfn, BTFIXUPCALL_NORM);
2206 #if 0 /* PAGE_SHIFT <= 12 */ /* Eek. Investigate. XXX */
2207         BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_ANDNINT(PAGE_SIZE - 1));
2208 #else
2209         BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_NORM);
2210 #endif
2211         BTFIXUPSET_CALL(pmd_set, sun4c_pmd_set, BTFIXUPCALL_NORM);
2212         BTFIXUPSET_CALL(pmd_populate, sun4c_pmd_populate, BTFIXUPCALL_NORM);
2213
2214         BTFIXUPSET_CALL(pte_present, sun4c_pte_present, BTFIXUPCALL_NORM);
2215         BTFIXUPSET_CALL(pte_clear, sun4c_pte_clear, BTFIXUPCALL_STG0O0);
2216         BTFIXUPSET_CALL(pte_read, sun4c_pte_read, BTFIXUPCALL_NORM);
2217
2218         BTFIXUPSET_CALL(pmd_bad, sun4c_pmd_bad, BTFIXUPCALL_NORM);
2219         BTFIXUPSET_CALL(pmd_present, sun4c_pmd_present, BTFIXUPCALL_NORM);
2220         BTFIXUPSET_CALL(pmd_clear, sun4c_pmd_clear, BTFIXUPCALL_STG0O0);
2221
2222         BTFIXUPSET_CALL(pgd_none, sun4c_pgd_none, BTFIXUPCALL_RETINT(0));
2223         BTFIXUPSET_CALL(pgd_bad, sun4c_pgd_bad, BTFIXUPCALL_RETINT(0));
2224         BTFIXUPSET_CALL(pgd_present, sun4c_pgd_present, BTFIXUPCALL_RETINT(1));
2225         BTFIXUPSET_CALL(pgd_clear, sun4c_pgd_clear, BTFIXUPCALL_NOP);
2226
2227         BTFIXUPSET_CALL(mk_pte, sun4c_mk_pte, BTFIXUPCALL_NORM);
2228         BTFIXUPSET_CALL(mk_pte_phys, sun4c_mk_pte_phys, BTFIXUPCALL_NORM);
2229         BTFIXUPSET_CALL(mk_pte_io, sun4c_mk_pte_io, BTFIXUPCALL_NORM);
2230
2231         BTFIXUPSET_INT(pte_modify_mask, _SUN4C_PAGE_CHG_MASK);
2232         BTFIXUPSET_CALL(pmd_offset, sun4c_pmd_offset, BTFIXUPCALL_NORM);
2233         BTFIXUPSET_CALL(pte_offset_kernel, sun4c_pte_offset_kernel, BTFIXUPCALL_NORM);
2234         BTFIXUPSET_CALL(free_pte_fast, sun4c_free_pte_fast, BTFIXUPCALL_NORM);
2235         BTFIXUPSET_CALL(pte_free, sun4c_pte_free, BTFIXUPCALL_NORM);
2236         BTFIXUPSET_CALL(pte_alloc_one_kernel, sun4c_pte_alloc_one_kernel, BTFIXUPCALL_NORM);
2237         BTFIXUPSET_CALL(pte_alloc_one, sun4c_pte_alloc_one, BTFIXUPCALL_NORM);
2238         BTFIXUPSET_CALL(free_pmd_fast, sun4c_free_pmd_fast, BTFIXUPCALL_NOP);
2239         BTFIXUPSET_CALL(pmd_alloc_one, sun4c_pmd_alloc_one, BTFIXUPCALL_RETO0);
2240         BTFIXUPSET_CALL(free_pgd_fast, sun4c_free_pgd_fast, BTFIXUPCALL_NORM);
2241         BTFIXUPSET_CALL(get_pgd_fast, sun4c_get_pgd_fast, BTFIXUPCALL_NORM);
2242
2243         BTFIXUPSET_HALF(pte_writei, _SUN4C_PAGE_WRITE);
2244         BTFIXUPSET_HALF(pte_dirtyi, _SUN4C_PAGE_MODIFIED);
2245         BTFIXUPSET_HALF(pte_youngi, _SUN4C_PAGE_ACCESSED);
2246         BTFIXUPSET_HALF(pte_filei, _SUN4C_PAGE_FILE);
2247         BTFIXUPSET_HALF(pte_wrprotecti, _SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE);
2248         BTFIXUPSET_HALF(pte_mkcleani, _SUN4C_PAGE_MODIFIED|_SUN4C_PAGE_SILENT_WRITE);
2249         BTFIXUPSET_HALF(pte_mkoldi, _SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_SILENT_READ);
2250         BTFIXUPSET_CALL(pte_mkwrite, sun4c_pte_mkwrite, BTFIXUPCALL_NORM);
2251         BTFIXUPSET_CALL(pte_mkdirty, sun4c_pte_mkdirty, BTFIXUPCALL_NORM);
2252         BTFIXUPSET_CALL(pte_mkyoung, sun4c_pte_mkyoung, BTFIXUPCALL_NORM);
2253         BTFIXUPSET_CALL(update_mmu_cache, sun4c_update_mmu_cache, BTFIXUPCALL_NORM);
2254
2255         BTFIXUPSET_CALL(pte_to_pgoff, sun4c_pte_to_pgoff, BTFIXUPCALL_NORM);
2256         BTFIXUPSET_CALL(pgoff_to_pte, sun4c_pgoff_to_pte, BTFIXUPCALL_NORM);
2257
2258         BTFIXUPSET_CALL(mmu_lockarea, sun4c_lockarea, BTFIXUPCALL_NORM);
2259         BTFIXUPSET_CALL(mmu_unlockarea, sun4c_unlockarea, BTFIXUPCALL_NORM);
2260
2261         BTFIXUPSET_CALL(mmu_get_scsi_one, sun4c_get_scsi_one, BTFIXUPCALL_NORM);
2262         BTFIXUPSET_CALL(mmu_get_scsi_sgl, sun4c_get_scsi_sgl, BTFIXUPCALL_NORM);
2263         BTFIXUPSET_CALL(mmu_release_scsi_one, sun4c_release_scsi_one, BTFIXUPCALL_NORM);
2264         BTFIXUPSET_CALL(mmu_release_scsi_sgl, sun4c_release_scsi_sgl, BTFIXUPCALL_NORM);
2265
2266         BTFIXUPSET_CALL(mmu_map_dma_area, sun4c_map_dma_area, BTFIXUPCALL_NORM);
2267         BTFIXUPSET_CALL(mmu_unmap_dma_area, sun4c_unmap_dma_area, BTFIXUPCALL_NORM);
2268         BTFIXUPSET_CALL(mmu_translate_dvma, sun4c_translate_dvma, BTFIXUPCALL_NORM);
2269
2270         BTFIXUPSET_CALL(sparc_mapiorange, sun4c_mapiorange, BTFIXUPCALL_NORM);
2271         BTFIXUPSET_CALL(sparc_unmapiorange, sun4c_unmapiorange, BTFIXUPCALL_NORM);
2272
2273         BTFIXUPSET_CALL(__swp_type, sun4c_swp_type, BTFIXUPCALL_NORM);
2274         BTFIXUPSET_CALL(__swp_offset, sun4c_swp_offset, BTFIXUPCALL_NORM);
2275         BTFIXUPSET_CALL(__swp_entry, sun4c_swp_entry, BTFIXUPCALL_NORM);
2276
2277         BTFIXUPSET_CALL(alloc_thread_info, sun4c_alloc_thread_info, BTFIXUPCALL_NORM);
2278         BTFIXUPSET_CALL(free_thread_info, sun4c_free_thread_info, BTFIXUPCALL_NORM);
2279
2280         BTFIXUPSET_CALL(mmu_info, sun4c_mmu_info, BTFIXUPCALL_NORM);
2281
2282         /* These should _never_ get called with two level tables. */
2283         BTFIXUPSET_CALL(pgd_set, sun4c_pgd_set, BTFIXUPCALL_NOP);
2284         BTFIXUPSET_CALL(pgd_page, sun4c_pgd_page, BTFIXUPCALL_RETO0);
2285 }