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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/kernel.h>
  14 #include <linux/mm.h>
  15 #include <linux/init.h>
  16 #include <linux/bootmem.h>
  17 #include <linux/highmem.h>
  18 #include <linux/fs.h>
  19 #include <linux/seq_file.h>
  20 #include <linux/scatterlist.h>
  21
  22 #include <asm/page.h>
  23 #include <asm/pgalloc.h>
  24 #include <asm/pgtable.h>
  25 #include <asm/vaddrs.h>
  26 #include <asm/idprom.h>
  27 #include <asm/machines.h>
  28 #include <asm/memreg.h>
  29 #include <asm/processor.h>
  30 #include <asm/auxio.h>
  31 #include <asm/io.h>
  32 #include <asm/oplib.h>
  33 #include <asm/openprom.h>
  34 #include <asm/mmu_context.h>
  35 #include <asm/sun4paddr.h>
  36 #include <asm/highmem.h>
  37 #include <asm/btfixup.h>
  38 #include <asm/cacheflush.h>
  39 #include <asm/tlbflush.h>
  40
  41 /* Because of our dynamic kernel TLB miss strategy, and how
  42  * our DVMA mapping allocation works, you _MUST_:
  43  *
  44  * 1) Disable interrupts _and_ not touch any dynamic kernel
  45  *    memory while messing with kernel MMU state.  By
  46  *    dynamic memory I mean any object which is not in
  47  *    the kernel image itself or a thread_union (both of
  48  *    which are locked into the MMU).
  49  * 2) Disable interrupts while messing with user MMU state.
  50  */
  51
  52 extern int num_segmaps, num_contexts;
  53
  54 extern unsigned long page_kernel;
  55
  56 #ifdef CONFIG_SUN4
  57 #define SUN4C_VAC_SIZE sun4c_vacinfo.num_bytes
  58 #else
  59 /* That's it, we prom_halt() on sun4c if the cache size is something other than 65536.
  60  * So let's save some cycles and just use that everywhere except for that bootup
  61  * sanity check.
  62  */
  63 #define SUN4C_VAC_SIZE 65536
  64 #endif
  65
  66 #define SUN4C_KERNEL_BUCKETS 32
  67
  68 /* Flushing the cache. */
  69 struct sun4c_vac_props sun4c_vacinfo;
  70 unsigned long sun4c_kernel_faults;
  71
  72 /* Invalidate every sun4c cache line tag. */
  73 static void __init sun4c_flush_all(void)
  74 {
  75         unsigned long begin, end;
  76
  77         if (sun4c_vacinfo.on)
  78                 panic("SUN4C: AIEEE, trying to invalidate vac while it is on.");
  79
  80         /* Clear 'valid' bit in all cache line tags */
  81         begin = AC_CACHETAGS;
  82         end = (AC_CACHETAGS + SUN4C_VAC_SIZE);
  83         while (begin < end) {
  84                 __asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
  85                                      "r" (begin), "i" (ASI_CONTROL));
  86                 begin += sun4c_vacinfo.linesize;
  87         }
  88 }
  89
  90 static void sun4c_flush_context_hw(void)
  91 {
  92         unsigned long end = SUN4C_VAC_SIZE;
  93
  94         __asm__ __volatile__(
  95                 "1:     addcc   %0, -4096, %0\n\t"
  96                 "       bne     1b\n\t"
  97                 "        sta    %%g0, [%0] %2"
  98         : "=&r" (end)
  99         : "0" (end), "i" (ASI_HWFLUSHCONTEXT)
 100         : "cc");
 101 }
 102
 103 /* Must be called minimally with IRQs disabled. */
 104 static void sun4c_flush_segment_hw(unsigned long addr)
 105 {
 106         if (sun4c_get_segmap(addr) != invalid_segment) {
 107                 unsigned long vac_size = SUN4C_VAC_SIZE;
 108
 109                 __asm__ __volatile__(
 110                         "1:     addcc   %0, -4096, %0\n\t"
 111                         "       bne     1b\n\t"
 112                         "        sta    %%g0, [%2 + %0] %3"
 113                         : "=&r" (vac_size)
 114                         : "0" (vac_size), "r" (addr), "i" (ASI_HWFLUSHSEG)
 115                         : "cc");
 116         }
 117 }
 118
 119 /* File local boot time fixups. */
 120 BTFIXUPDEF_CALL(void, sun4c_flush_page, unsigned long)
 121 BTFIXUPDEF_CALL(void, sun4c_flush_segment, unsigned long)
 122 BTFIXUPDEF_CALL(void, sun4c_flush_context, void)
 123
 124 #define sun4c_flush_page(addr) BTFIXUP_CALL(sun4c_flush_page)(addr)
 125 #define sun4c_flush_segment(addr) BTFIXUP_CALL(sun4c_flush_segment)(addr)
 126 #define sun4c_flush_context() BTFIXUP_CALL(sun4c_flush_context)()
 127
 128 /* Must be called minimally with interrupts disabled. */
 129 static void sun4c_flush_page_hw(unsigned long addr)
 130 {
 131         addr &= PAGE_MASK;
 132         if ((int)sun4c_get_pte(addr) < 0)
 133                 __asm__ __volatile__("sta %%g0, [%0] %1"
 134                                      : : "r" (addr), "i" (ASI_HWFLUSHPAGE));
 135 }
 136
 137 /* Don't inline the software version as it eats too many cache lines if expanded. */
 138 static void sun4c_flush_context_sw(void)
 139 {
 140         unsigned long nbytes = SUN4C_VAC_SIZE;
 141         unsigned long lsize = sun4c_vacinfo.linesize;
 142
 143         __asm__ __volatile__(
 144         "add    %2, %2, %%g1\n\t"
 145         "add    %2, %%g1, %%g2\n\t"
 146         "add    %2, %%g2, %%g3\n\t"
 147         "add    %2, %%g3, %%g4\n\t"
 148         "add    %2, %%g4, %%g5\n\t"
 149         "add    %2, %%g5, %%o4\n\t"
 150         "add    %2, %%o4, %%o5\n"
 151         "1:\n\t"
 152         "subcc  %0, %%o5, %0\n\t"
 153         "sta    %%g0, [%0] %3\n\t"
 154         "sta    %%g0, [%0 + %2] %3\n\t"
 155         "sta    %%g0, [%0 + %%g1] %3\n\t"
 156         "sta    %%g0, [%0 + %%g2] %3\n\t"
 157         "sta    %%g0, [%0 + %%g3] %3\n\t"
 158         "sta    %%g0, [%0 + %%g4] %3\n\t"
 159         "sta    %%g0, [%0 + %%g5] %3\n\t"
 160         "bg     1b\n\t"
 161         " sta   %%g0, [%1 + %%o4] %3\n"
 162         : "=&r" (nbytes)
 163         : "0" (nbytes), "r" (lsize), "i" (ASI_FLUSHCTX)
 164         : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
 165 }
 166
 167 /* Don't inline the software version as it eats too many cache lines if expanded. */
 168 static void sun4c_flush_segment_sw(unsigned long addr)
 169 {
 170         if (sun4c_get_segmap(addr) != invalid_segment) {
 171                 unsigned long nbytes = SUN4C_VAC_SIZE;
 172                 unsigned long lsize = sun4c_vacinfo.linesize;
 173
 174                 __asm__ __volatile__(
 175                 "add    %2, %2, %%g1\n\t"
 176                 "add    %2, %%g1, %%g2\n\t"
 177                 "add    %2, %%g2, %%g3\n\t"
 178                 "add    %2, %%g3, %%g4\n\t"
 179                 "add    %2, %%g4, %%g5\n\t"
 180                 "add    %2, %%g5, %%o4\n\t"
 181                 "add    %2, %%o4, %%o5\n"
 182                 "1:\n\t"
 183                 "subcc  %1, %%o5, %1\n\t"
 184                 "sta    %%g0, [%0] %6\n\t"
 185                 "sta    %%g0, [%0 + %2] %6\n\t"
 186                 "sta    %%g0, [%0 + %%g1] %6\n\t"
 187                 "sta    %%g0, [%0 + %%g2] %6\n\t"
 188                 "sta    %%g0, [%0 + %%g3] %6\n\t"
 189                 "sta    %%g0, [%0 + %%g4] %6\n\t"
 190                 "sta    %%g0, [%0 + %%g5] %6\n\t"
 191                 "sta    %%g0, [%0 + %%o4] %6\n\t"
 192                 "bg     1b\n\t"
 193                 " add   %0, %%o5, %0\n"
 194                 : "=&r" (addr), "=&r" (nbytes), "=&r" (lsize)
 195                 : "0" (addr), "1" (nbytes), "2" (lsize),
 196                   "i" (ASI_FLUSHSEG)
 197                 : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
 198         }
 199 }
 200
 201 /* Don't inline the software version as it eats too many cache lines if expanded. */
 202 static void sun4c_flush_page_sw(unsigned long addr)
 203 {
 204         addr &= PAGE_MASK;
 205         if ((sun4c_get_pte(addr) & (_SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_VALID)) ==
 206             _SUN4C_PAGE_VALID) {
 207                 unsigned long left = PAGE_SIZE;
 208                 unsigned long lsize = sun4c_vacinfo.linesize;
 209
 210                 __asm__ __volatile__(
 211                 "add    %2, %2, %%g1\n\t"
 212                 "add    %2, %%g1, %%g2\n\t"
 213                 "add    %2, %%g2, %%g3\n\t"
 214                 "add    %2, %%g3, %%g4\n\t"
 215                 "add    %2, %%g4, %%g5\n\t"
 216                 "add    %2, %%g5, %%o4\n\t"
 217                 "add    %2, %%o4, %%o5\n"
 218                 "1:\n\t"
 219                 "subcc  %1, %%o5, %1\n\t"
 220                 "sta    %%g0, [%0] %6\n\t"
 221                 "sta    %%g0, [%0 + %2] %6\n\t"
 222                 "sta    %%g0, [%0 + %%g1] %6\n\t"
 223                 "sta    %%g0, [%0 + %%g2] %6\n\t"
 224                 "sta    %%g0, [%0 + %%g3] %6\n\t"
 225                 "sta    %%g0, [%0 + %%g4] %6\n\t"
 226                 "sta    %%g0, [%0 + %%g5] %6\n\t"
 227                 "sta    %%g0, [%0 + %%o4] %6\n\t"
 228                 "bg     1b\n\t"
 229                 " add   %0, %%o5, %0\n"
 230                 : "=&r" (addr), "=&r" (left), "=&r" (lsize)
 231                 : "0" (addr), "1" (left), "2" (lsize),
 232                   "i" (ASI_FLUSHPG)
 233                 : "g1", "g2", "g3", "g4", "g5", "o4", "o5", "cc");
 234         }
 235 }
 236
 237 /* The sun4c's do have an on chip store buffer.  And the way you
 238  * clear them out isn't so obvious.  The only way I can think of
 239  * to accomplish this is to read the current context register,
 240  * store the same value there, then read an external hardware
 241  * register.
 242  */
 243 void sun4c_complete_all_stores(void)
 244 {
 245         volatile int _unused;
 246
 247         _unused = sun4c_get_context();
 248         sun4c_set_context(_unused);
 249 #ifdef CONFIG_SUN_AUXIO
 250         _unused = get_auxio();
 251 #endif
 252 }
 253
 254 /* Bootup utility functions. */
 255 static inline void sun4c_init_clean_segmap(unsigned char pseg)
 256 {
 257         unsigned long vaddr;
 258
 259         sun4c_put_segmap(0, pseg);
 260         for (vaddr = 0; vaddr < SUN4C_REAL_PGDIR_SIZE; vaddr += PAGE_SIZE)
 261                 sun4c_put_pte(vaddr, 0);
 262         sun4c_put_segmap(0, invalid_segment);
 263 }
 264
 265 static inline void sun4c_init_clean_mmu(unsigned long kernel_end)
 266 {
 267         unsigned long vaddr;
 268         unsigned char savectx, ctx;
 269
 270         savectx = sun4c_get_context();
 271         for (ctx = 0; ctx < num_contexts; ctx++) {
 272                 sun4c_set_context(ctx);
 273                 for (vaddr = 0; vaddr < 0x20000000; vaddr += SUN4C_REAL_PGDIR_SIZE)
 274                         sun4c_put_segmap(vaddr, invalid_segment);
 275                 for (vaddr = 0xe0000000; vaddr < KERNBASE; vaddr += SUN4C_REAL_PGDIR_SIZE)
 276                         sun4c_put_segmap(vaddr, invalid_segment);
 277                 for (vaddr = kernel_end; vaddr < KADB_DEBUGGER_BEGVM; vaddr += SUN4C_REAL_PGDIR_SIZE)
 278                         sun4c_put_segmap(vaddr, invalid_segment);
 279                 for (vaddr = LINUX_OPPROM_ENDVM; vaddr; vaddr += SUN4C_REAL_PGDIR_SIZE)
 280                         sun4c_put_segmap(vaddr, invalid_segment);
 281         }
 282         sun4c_set_context(savectx);
 283 }
 284
 285 void __init sun4c_probe_vac(void)
 286 {
 287         sun4c_disable_vac();
 288
 289         if (ARCH_SUN4) {
 290                 switch (idprom->id_machtype) {
 291
 292                 case (SM_SUN4|SM_4_110):
 293                         sun4c_vacinfo.type = VAC_NONE;
 294                         sun4c_vacinfo.num_bytes = 0;
 295                         sun4c_vacinfo.linesize = 0;
 296                         sun4c_vacinfo.do_hwflushes = 0;
 297                         prom_printf("No VAC. Get some bucks and buy a real computer.");
 298                         prom_halt();
 299                         break;
 300
 301                 case (SM_SUN4|SM_4_260):
 302                         sun4c_vacinfo.type = VAC_WRITE_BACK;
 303                         sun4c_vacinfo.num_bytes = 128 * 1024;
 304                         sun4c_vacinfo.linesize = 16;
 305                         sun4c_vacinfo.do_hwflushes = 0;
 306                         break;
 307
 308                 case (SM_SUN4|SM_4_330):
 309                         sun4c_vacinfo.type = VAC_WRITE_THROUGH;
 310                         sun4c_vacinfo.num_bytes = 128 * 1024;
 311                         sun4c_vacinfo.linesize = 16;
 312                         sun4c_vacinfo.do_hwflushes = 0;
 313                         break;
 314
 315                 case (SM_SUN4|SM_4_470):
 316                         sun4c_vacinfo.type = VAC_WRITE_BACK;
 317                         sun4c_vacinfo.num_bytes = 128 * 1024;
 318                         sun4c_vacinfo.linesize = 32;
 319                         sun4c_vacinfo.do_hwflushes = 0;
 320                         break;
 321
 322                 default:
 323                         prom_printf("Cannot initialize VAC - weird sun4 model idprom->id_machtype = %d", idprom->id_machtype);
 324                         prom_halt();
 325                 };
 326         } else {
 327                 sun4c_vacinfo.type = VAC_WRITE_THROUGH;
 328
 329                 if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
 330                     (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
 331                         /* PROM on SS1 lacks this info, to be super safe we
 332                          * hard code it here since this arch is cast in stone.
 333                          */
 334                         sun4c_vacinfo.num_bytes = 65536;
 335                         sun4c_vacinfo.linesize = 16;
 336                 } else {
 337                         sun4c_vacinfo.num_bytes =
 338                          prom_getintdefault(prom_root_node, "vac-size", 65536);
 339                         sun4c_vacinfo.linesize =
 340                          prom_getintdefault(prom_root_node, "vac-linesize", 16);
 341                 }
 342                 sun4c_vacinfo.do_hwflushes =
 343                  prom_getintdefault(prom_root_node, "vac-hwflush", 0);
 344
 345                 if (sun4c_vacinfo.do_hwflushes == 0)
 346                         sun4c_vacinfo.do_hwflushes =
 347                          prom_getintdefault(prom_root_node, "vac_hwflush", 0);
 348
 349                 if (sun4c_vacinfo.num_bytes != 65536) {
 350                         prom_printf("WEIRD Sun4C VAC cache size, "
 351                                     "tell sparclinux@vger.kernel.org");
 352                         prom_halt();
 353                 }
 354         }
 355
 356         sun4c_vacinfo.num_lines =
 357                 (sun4c_vacinfo.num_bytes / sun4c_vacinfo.linesize);
 358         switch (sun4c_vacinfo.linesize) {
 359         case 16:
 360                 sun4c_vacinfo.log2lsize = 4;
 361                 break;
 362         case 32:
 363                 sun4c_vacinfo.log2lsize = 5;
 364                 break;
 365         default:
 366                 prom_printf("probe_vac: Didn't expect vac-linesize of %d, halting\n",
 367                             sun4c_vacinfo.linesize);
 368                 prom_halt();
 369         };
 370
 371         sun4c_flush_all();
 372         sun4c_enable_vac();
 373 }
 374
 375 /* Patch instructions for the low level kernel fault handler. */
 376 extern unsigned long invalid_segment_patch1, invalid_segment_patch1_ff;
 377 extern unsigned long invalid_segment_patch2, invalid_segment_patch2_ff;
 378 extern unsigned long invalid_segment_patch1_1ff, invalid_segment_patch2_1ff;
 379 extern unsigned long num_context_patch1, num_context_patch1_16;
 380 extern unsigned long num_context_patch2_16;
 381 extern unsigned long vac_linesize_patch, vac_linesize_patch_32;
 382 extern unsigned long vac_hwflush_patch1, vac_hwflush_patch1_on;
 383 extern unsigned long vac_hwflush_patch2, vac_hwflush_patch2_on;
 384
 385 #define PATCH_INSN(src, dst) do {       \
 386                 daddr = &(dst);         \
 387                 iaddr = &(src);         \
 388                 *daddr = *iaddr;        \
 389         } while (0)
 390
 391 static void __init patch_kernel_fault_handler(void)
 392 {
 393         unsigned long *iaddr, *daddr;
 394
 395         switch (num_segmaps) {
 396                 case 128:
 397                         /* Default, nothing to do. */
 398                         break;
 399                 case 256:
 400                         PATCH_INSN(invalid_segment_patch1_ff,
 401                                    invalid_segment_patch1);
 402                         PATCH_INSN(invalid_segment_patch2_ff,
 403                                    invalid_segment_patch2);
 404                         break;
 405                 case 512:
 406                         PATCH_INSN(invalid_segment_patch1_1ff,
 407                                    invalid_segment_patch1);
 408                         PATCH_INSN(invalid_segment_patch2_1ff,
 409                                    invalid_segment_patch2);
 410                         break;
 411                 default:
 412                         prom_printf("Unhandled number of segmaps: %d\n",
 413                                     num_segmaps);
 414                         prom_halt();
 415         };
 416         switch (num_contexts) {
 417                 case 8:
 418                         /* Default, nothing to do. */
 419                         break;
 420                 case 16:
 421                         PATCH_INSN(num_context_patch1_16,
 422                                    num_context_patch1);
 423                         break;
 424                 default:
 425                         prom_printf("Unhandled number of contexts: %d\n",
 426                                     num_contexts);
 427                         prom_halt();
 428         };
 429
 430         if (sun4c_vacinfo.do_hwflushes != 0) {
 431                 PATCH_INSN(vac_hwflush_patch1_on, vac_hwflush_patch1);
 432                 PATCH_INSN(vac_hwflush_patch2_on, vac_hwflush_patch2);
 433         } else {
 434                 switch (sun4c_vacinfo.linesize) {
 435                 case 16:
 436                         /* Default, nothing to do. */
 437                         break;
 438                 case 32:
 439                         PATCH_INSN(vac_linesize_patch_32, vac_linesize_patch);
 440                         break;
 441                 default:
 442                         prom_printf("Impossible VAC linesize %d, halting...\n",
 443                                     sun4c_vacinfo.linesize);
 444                         prom_halt();
 445                 };
 446         }
 447 }
 448
 449 static void __init sun4c_probe_mmu(void)
 450 {
 451         if (ARCH_SUN4) {
 452                 switch (idprom->id_machtype) {
 453                 case (SM_SUN4|SM_4_110):
 454                         prom_printf("No support for 4100 yet\n");
 455                         prom_halt();
 456                         num_segmaps = 256;
 457                         num_contexts = 8;
 458                         break;
 459
 460                 case (SM_SUN4|SM_4_260):
 461                         /* should be 512 segmaps. when it get fixed */
 462                         num_segmaps = 256;
 463                         num_contexts = 16;
 464                         break;
 465
 466                 case (SM_SUN4|SM_4_330):
 467                         num_segmaps = 256;
 468                         num_contexts = 16;
 469                         break;
 470
 471                 case (SM_SUN4|SM_4_470):
 472                         /* should be 1024 segmaps. when it get fixed */
 473                         num_segmaps = 256;
 474                         num_contexts = 64;
 475                         break;
 476                 default:
 477                         prom_printf("Invalid SUN4 model\n");
 478                         prom_halt();
 479                 };
 480         } else {
 481                 if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS1)) ||
 482                     (idprom->id_machtype == (SM_SUN4C | SM_4C_SS1PLUS))) {
 483                         /* Hardcode these just to be safe, PROM on SS1 does
 484                         * not have this info available in the root node.
 485                         */
 486                         num_segmaps = 128;
 487                         num_contexts = 8;
 488                 } else {
 489                         num_segmaps =
 490                             prom_getintdefault(prom_root_node, "mmu-npmg", 128);
 491                         num_contexts =
 492                             prom_getintdefault(prom_root_node, "mmu-nctx", 0x8);
 493                 }
 494         }
 495         patch_kernel_fault_handler();
 496 }
 497
 498 volatile unsigned long __iomem *sun4c_memerr_reg = NULL;
 499
 500 void __init sun4c_probe_memerr_reg(void)
 501 {
 502         int node;
 503         struct linux_prom_registers regs[1];
 504
 505         if (ARCH_SUN4) {
 506                 sun4c_memerr_reg = ioremap(sun4_memreg_physaddr, PAGE_SIZE);
 507         } else {
 508                 node = prom_getchild(prom_root_node);
 509                 node = prom_searchsiblings(prom_root_node, "memory-error");
 510                 if (!node)
 511                         return;
 512                 if (prom_getproperty(node, "reg", (char *)regs, sizeof(regs)) <= 0)
 513                         return;
 514                 /* hmm I think regs[0].which_io is zero here anyways */
 515                 sun4c_memerr_reg = ioremap(regs[0].phys_addr, regs[0].reg_size);
 516         }
 517 }
 518
 519 static inline void sun4c_init_ss2_cache_bug(void)
 520 {
 521         extern unsigned long start;
 522
 523         if ((idprom->id_machtype == (SM_SUN4C | SM_4C_SS2)) ||
 524             (idprom->id_machtype == (SM_SUN4C | SM_4C_IPX)) ||
 525             (idprom->id_machtype == (SM_SUN4 | SM_4_330)) ||
 526             (idprom->id_machtype == (SM_SUN4C | SM_4C_ELC))) {
 527                 /* Whee.. */
 528                 printk("SS2 cache bug detected, uncaching trap table page\n");
 529                 sun4c_flush_page((unsigned int) &start);
 530                 sun4c_put_pte(((unsigned long) &start),
 531                         (sun4c_get_pte((unsigned long) &start) | _SUN4C_PAGE_NOCACHE));
 532         }
 533 }
 534
 535 /* Addr is always aligned on a page boundary for us already. */
 536 static int sun4c_map_dma_area(dma_addr_t *pba, unsigned long va,
 537     unsigned long addr, int len)
 538 {
 539         unsigned long page, end;
 540
 541         *pba = addr;
 542
 543         end = PAGE_ALIGN((addr + len));
 544         while (addr < end) {
 545                 page = va;
 546                 sun4c_flush_page(page);
 547                 page -= PAGE_OFFSET;
 548                 page >>= PAGE_SHIFT;
 549                 page |= (_SUN4C_PAGE_VALID | _SUN4C_PAGE_DIRTY |
 550                          _SUN4C_PAGE_NOCACHE | _SUN4C_PAGE_PRIV);
 551                 sun4c_put_pte(addr, page);
 552                 addr += PAGE_SIZE;
 553                 va += PAGE_SIZE;
 554         }
 555
 556         return 0;
 557 }
 558
 559 static struct page *sun4c_translate_dvma(unsigned long busa)
 560 {
 561         /* Fortunately for us, bus_addr == uncached_virt in sun4c. */
 562         unsigned long pte = sun4c_get_pte(busa);
 563         return pfn_to_page(pte & SUN4C_PFN_MASK);
 564 }
 565
 566 static void sun4c_unmap_dma_area(unsigned long busa, int len)
 567 {
 568         /* Fortunately for us, bus_addr == uncached_virt in sun4c. */
 569         /* XXX Implement this */
 570 }
 571
 572 /* TLB management. */
 573
 574 /* Don't change this struct without changing entry.S. This is used
 575  * in the in-window kernel fault handler, and you don't want to mess
 576  * with that. (See sun4c_fault in entry.S).
 577  */
 578 struct sun4c_mmu_entry {
 579         struct sun4c_mmu_entry *next;
 580         struct sun4c_mmu_entry *prev;
 581         unsigned long vaddr;
 582         unsigned char pseg;
 583         unsigned char locked;
 584
 585         /* For user mappings only, and completely hidden from kernel
 586          * TLB miss code.
 587          */
 588         unsigned char ctx;
 589         struct sun4c_mmu_entry *lru_next;
 590         struct sun4c_mmu_entry *lru_prev;
 591 };
 592
 593 static struct sun4c_mmu_entry mmu_entry_pool[SUN4C_MAX_SEGMAPS];
 594
 595 static void __init sun4c_init_mmu_entry_pool(void)
 596 {
 597         int i;
 598
 599         for (i=0; i < SUN4C_MAX_SEGMAPS; i++) {
 600                 mmu_entry_pool[i].pseg = i;
 601                 mmu_entry_pool[i].next = NULL;
 602                 mmu_entry_pool[i].prev = NULL;
 603                 mmu_entry_pool[i].vaddr = 0;
 604                 mmu_entry_pool[i].locked = 0;
 605                 mmu_entry_pool[i].ctx = 0;
 606                 mmu_entry_pool[i].lru_next = NULL;
 607                 mmu_entry_pool[i].lru_prev = NULL;
 608         }
 609         mmu_entry_pool[invalid_segment].locked = 1;
 610 }
 611
 612 static inline void fix_permissions(unsigned long vaddr, unsigned long bits_on,
 613                                    unsigned long bits_off)
 614 {
 615         unsigned long start, end;
 616
 617         end = vaddr + SUN4C_REAL_PGDIR_SIZE;
 618         for (start = vaddr; start < end; start += PAGE_SIZE)
 619                 if (sun4c_get_pte(start) & _SUN4C_PAGE_VALID)
 620                         sun4c_put_pte(start, (sun4c_get_pte(start) | bits_on) &
 621                                       ~bits_off);
 622 }
 623
 624 static inline void sun4c_init_map_kernelprom(unsigned long kernel_end)
 625 {
 626         unsigned long vaddr;
 627         unsigned char pseg, ctx;
 628 #ifdef CONFIG_SUN4
 629         /* sun4/110 and 260 have no kadb. */
 630         if ((idprom->id_machtype != (SM_SUN4 | SM_4_260)) &&
 631             (idprom->id_machtype != (SM_SUN4 | SM_4_110))) {
 632 #endif
 633         for (vaddr = KADB_DEBUGGER_BEGVM;
 634              vaddr < LINUX_OPPROM_ENDVM;
 635              vaddr += SUN4C_REAL_PGDIR_SIZE) {
 636                 pseg = sun4c_get_segmap(vaddr);
 637                 if (pseg != invalid_segment) {
 638                         mmu_entry_pool[pseg].locked = 1;
 639                         for (ctx = 0; ctx < num_contexts; ctx++)
 640                                 prom_putsegment(ctx, vaddr, pseg);
 641                         fix_permissions(vaddr, _SUN4C_PAGE_PRIV, 0);
 642                 }
 643         }
 644 #ifdef CONFIG_SUN4
 645         }
 646 #endif
 647         for (vaddr = KERNBASE; vaddr < kernel_end; vaddr += SUN4C_REAL_PGDIR_SIZE) {
 648                 pseg = sun4c_get_segmap(vaddr);
 649                 mmu_entry_pool[pseg].locked = 1;
 650                 for (ctx = 0; ctx < num_contexts; ctx++)
 651                         prom_putsegment(ctx, vaddr, pseg);
 652                 fix_permissions(vaddr, _SUN4C_PAGE_PRIV, _SUN4C_PAGE_NOCACHE);
 653         }
 654 }
 655
 656 static void __init sun4c_init_lock_area(unsigned long start, unsigned long end)
 657 {
 658         int i, ctx;
 659
 660         while (start < end) {
 661                 for (i = 0; i < invalid_segment; i++)
 662                         if (!mmu_entry_pool[i].locked)
 663                                 break;
 664                 mmu_entry_pool[i].locked = 1;
 665                 sun4c_init_clean_segmap(i);
 666                 for (ctx = 0; ctx < num_contexts; ctx++)
 667                         prom_putsegment(ctx, start, mmu_entry_pool[i].pseg);
 668                 start += SUN4C_REAL_PGDIR_SIZE;
 669         }
 670 }
 671
 672 /* Don't change this struct without changing entry.S. This is used
 673  * in the in-window kernel fault handler, and you don't want to mess
 674  * with that. (See sun4c_fault in entry.S).
 675  */
 676 struct sun4c_mmu_ring {
 677         struct sun4c_mmu_entry ringhd;
 678         int num_entries;
 679 };
 680
 681 static struct sun4c_mmu_ring sun4c_context_ring[SUN4C_MAX_CONTEXTS]; /* used user entries */
 682 static struct sun4c_mmu_ring sun4c_ufree_ring;       /* free user entries */
 683 static struct sun4c_mmu_ring sun4c_ulru_ring;        /* LRU user entries */
 684 struct sun4c_mmu_ring sun4c_kernel_ring;      /* used kernel entries */
 685 struct sun4c_mmu_ring sun4c_kfree_ring;       /* free kernel entries */
 686
 687 static inline void sun4c_init_rings(void)
 688 {
 689         int i;
 690
 691         for (i = 0; i < SUN4C_MAX_CONTEXTS; i++) {
 692                 sun4c_context_ring[i].ringhd.next =
 693                         sun4c_context_ring[i].ringhd.prev =
 694                         &sun4c_context_ring[i].ringhd;
 695                 sun4c_context_ring[i].num_entries = 0;
 696         }
 697         sun4c_ufree_ring.ringhd.next = sun4c_ufree_ring.ringhd.prev =
 698                 &sun4c_ufree_ring.ringhd;
 699         sun4c_ufree_ring.num_entries = 0;
 700         sun4c_ulru_ring.ringhd.lru_next = sun4c_ulru_ring.ringhd.lru_prev =
 701                 &sun4c_ulru_ring.ringhd;
 702         sun4c_ulru_ring.num_entries = 0;
 703         sun4c_kernel_ring.ringhd.next = sun4c_kernel_ring.ringhd.prev =
 704                 &sun4c_kernel_ring.ringhd;
 705         sun4c_kernel_ring.num_entries = 0;
 706         sun4c_kfree_ring.ringhd.next = sun4c_kfree_ring.ringhd.prev =
 707                 &sun4c_kfree_ring.ringhd;
 708         sun4c_kfree_ring.num_entries = 0;
 709 }
 710
 711 static void add_ring(struct sun4c_mmu_ring *ring,
 712                      struct sun4c_mmu_entry *entry)
 713 {
 714         struct sun4c_mmu_entry *head = &ring->ringhd;
 715
 716         entry->prev = head;
 717         (entry->next = head->next)->prev = entry;
 718         head->next = entry;
 719         ring->num_entries++;
 720 }
 721
 722 static __inline__ void add_lru(struct sun4c_mmu_entry *entry)
 723 {
 724         struct sun4c_mmu_ring *ring = &sun4c_ulru_ring;
 725         struct sun4c_mmu_entry *head = &ring->ringhd;
 726
 727         entry->lru_next = head;
 728         (entry->lru_prev = head->lru_prev)->lru_next = entry;
 729         head->lru_prev = entry;
 730 }
 731
 732 static void add_ring_ordered(struct sun4c_mmu_ring *ring,
 733                              struct sun4c_mmu_entry *entry)
 734 {
 735         struct sun4c_mmu_entry *head = &ring->ringhd;
 736         unsigned long addr = entry->vaddr;
 737
 738         while ((head->next != &ring->ringhd) && (head->next->vaddr < addr))
 739                 head = head->next;
 740
 741         entry->prev = head;
 742         (entry->next = head->next)->prev = entry;
 743         head->next = entry;
 744         ring->num_entries++;
 745
 746         add_lru(entry);
 747 }
 748
 749 static __inline__ void remove_ring(struct sun4c_mmu_ring *ring,
 750                                    struct sun4c_mmu_entry *entry)
 751 {
 752         struct sun4c_mmu_entry *next = entry->next;
 753
 754         (next->prev = entry->prev)->next = next;
 755         ring->num_entries--;
 756 }
 757
 758 static void remove_lru(struct sun4c_mmu_entry *entry)
 759 {
 760         struct sun4c_mmu_entry *next = entry->lru_next;
 761
 762         (next->lru_prev = entry->lru_prev)->lru_next = next;
 763 }
 764
 765 static void free_user_entry(int ctx, struct sun4c_mmu_entry *entry)
 766 {
 767         remove_ring(sun4c_context_ring+ctx, entry);
 768         remove_lru(entry);
 769         add_ring(&sun4c_ufree_ring, entry);
 770 }
 771
 772 static void free_kernel_entry(struct sun4c_mmu_entry *entry,
 773                               struct sun4c_mmu_ring *ring)
 774 {
 775         remove_ring(ring, entry);
 776         add_ring(&sun4c_kfree_ring, entry);
 777 }
 778
 779 static void __init sun4c_init_fill_kernel_ring(int howmany)
 780 {
 781         int i;
 782
 783         while (howmany) {
 784                 for (i = 0; i < invalid_segment; i++)
 785                         if (!mmu_entry_pool[i].locked)
 786                                 break;
 787                 mmu_entry_pool[i].locked = 1;
 788                 sun4c_init_clean_segmap(i);
 789                 add_ring(&sun4c_kfree_ring, &mmu_entry_pool[i]);
 790                 howmany--;
 791         }
 792 }
 793
 794 static void __init sun4c_init_fill_user_ring(void)
 795 {
 796         int i;
 797
 798         for (i = 0; i < invalid_segment; i++) {
 799                 if (mmu_entry_pool[i].locked)
 800                         continue;
 801                 sun4c_init_clean_segmap(i);
 802                 add_ring(&sun4c_ufree_ring, &mmu_entry_pool[i]);
 803         }
 804 }
 805
 806 static void sun4c_kernel_unmap(struct sun4c_mmu_entry *kentry)
 807 {
 808         int savectx, ctx;
 809
 810         savectx = sun4c_get_context();
 811         for (ctx = 0; ctx < num_contexts; ctx++) {
 812                 sun4c_set_context(ctx);
 813                 sun4c_put_segmap(kentry->vaddr, invalid_segment);
 814         }
 815         sun4c_set_context(savectx);
 816 }
 817
 818 static void sun4c_kernel_map(struct sun4c_mmu_entry *kentry)
 819 {
 820         int savectx, ctx;
 821
 822         savectx = sun4c_get_context();
 823         for (ctx = 0; ctx < num_contexts; ctx++) {
 824                 sun4c_set_context(ctx);
 825                 sun4c_put_segmap(kentry->vaddr, kentry->pseg);
 826         }
 827         sun4c_set_context(savectx);
 828 }
 829
 830 #define sun4c_user_unmap(__entry) \
 831         sun4c_put_segmap((__entry)->vaddr, invalid_segment)
 832
 833 static void sun4c_demap_context(struct sun4c_mmu_ring *crp, unsigned char ctx)
 834 {
 835         struct sun4c_mmu_entry *head = &crp->ringhd;
 836         unsigned long flags;
 837
 838         local_irq_save(flags);
 839         if (head->next != head) {
 840                 struct sun4c_mmu_entry *entry = head->next;
 841                 int savectx = sun4c_get_context();
 842
 843                 flush_user_windows();
 844                 sun4c_set_context(ctx);
 845                 sun4c_flush_context();
 846                 do {
 847                         struct sun4c_mmu_entry *next = entry->next;
 848
 849                         sun4c_user_unmap(entry);
 850                         free_user_entry(ctx, entry);
 851
 852                         entry = next;
 853                 } while (entry != head);
 854                 sun4c_set_context(savectx);
 855         }
 856         local_irq_restore(flags);
 857 }
 858
 859 static int sun4c_user_taken_entries;  /* This is how much we have.             */
 860 static int max_user_taken_entries;    /* This limits us and prevents deadlock. */
 861
 862 static struct sun4c_mmu_entry *sun4c_kernel_strategy(void)
 863 {
 864         struct sun4c_mmu_entry *this_entry;
 865
 866         /* If some are free, return first one. */
 867         if (sun4c_kfree_ring.num_entries) {
 868                 this_entry = sun4c_kfree_ring.ringhd.next;
 869                 return this_entry;
 870         }
 871
 872         /* Else free one up. */
 873         this_entry = sun4c_kernel_ring.ringhd.prev;
 874         sun4c_flush_segment(this_entry->vaddr);
 875         sun4c_kernel_unmap(this_entry);
 876         free_kernel_entry(this_entry, &sun4c_kernel_ring);
 877         this_entry = sun4c_kfree_ring.ringhd.next;
 878
 879         return this_entry;
 880 }
 881
 882 /* Using this method to free up mmu entries eliminates a lot of
 883  * potential races since we have a kernel that incurs tlb
 884  * replacement faults.  There may be performance penalties.
 885  *
 886  * NOTE: Must be called with interrupts disabled.
 887  */
 888 static struct sun4c_mmu_entry *sun4c_user_strategy(void)
 889 {
 890         struct sun4c_mmu_entry *entry;
 891         unsigned char ctx;
 892         int savectx;
 893
 894         /* If some are free, return first one. */
 895         if (sun4c_ufree_ring.num_entries) {
 896                 entry = sun4c_ufree_ring.ringhd.next;
 897                 goto unlink_out;
 898         }
 899
 900         if (sun4c_user_taken_entries) {
 901                 entry = sun4c_kernel_strategy();
 902                 sun4c_user_taken_entries--;
 903                 goto kunlink_out;
 904         }
 905
 906         /* Grab from the beginning of the LRU list. */
 907         entry = sun4c_ulru_ring.ringhd.lru_next;
 908         ctx = entry->ctx;
 909
 910         savectx = sun4c_get_context();
 911         flush_user_windows();
 912         sun4c_set_context(ctx);
 913         sun4c_flush_segment(entry->vaddr);
 914         sun4c_user_unmap(entry);
 915         remove_ring(sun4c_context_ring + ctx, entry);
 916         remove_lru(entry);
 917         sun4c_set_context(savectx);
 918
 919         return entry;
 920
 921 unlink_out:
 922         remove_ring(&sun4c_ufree_ring, entry);
 923         return entry;
 924 kunlink_out:
 925         remove_ring(&sun4c_kfree_ring, entry);
 926         return entry;
 927 }
 928
 929 /* NOTE: Must be called with interrupts disabled. */
 930 void sun4c_grow_kernel_ring(void)
 931 {
 932         struct sun4c_mmu_entry *entry;
 933
 934         /* Prevent deadlock condition. */
 935         if (sun4c_user_taken_entries >= max_user_taken_entries)
 936                 return;
 937
 938         if (sun4c_ufree_ring.num_entries) {
 939                 entry = sun4c_ufree_ring.ringhd.next;
 940                 remove_ring(&sun4c_ufree_ring, entry);
 941                 add_ring(&sun4c_kfree_ring, entry);
 942                 sun4c_user_taken_entries++;
 943         }
 944 }
 945
 946 /* 2 page buckets for task struct and kernel stack allocation.
 947  *
 948  * TASK_STACK_BEGIN
 949  * bucket[0]
 950  * bucket[1]
 951  *   [ ... ]
 952  * bucket[NR_TASK_BUCKETS-1]
 953  * TASK_STACK_BEGIN + (sizeof(struct task_bucket) * NR_TASK_BUCKETS)
 954  *
 955  * Each slot looks like:
 956  *
 957  *  page 1 --  task struct + beginning of kernel stack
 958  *  page 2 --  rest of kernel stack
 959  */
 960
 961 union task_union *sun4c_bucket[NR_TASK_BUCKETS];
 962
 963 static int sun4c_lowbucket_avail;
 964
 965 #define BUCKET_EMPTY     ((union task_union *) 0)
 966 #define BUCKET_SHIFT     (PAGE_SHIFT + 1)        /* log2(sizeof(struct task_bucket)) */
 967 #define BUCKET_SIZE      (1 << BUCKET_SHIFT)
 968 #define BUCKET_NUM(addr) ((((addr) - SUN4C_LOCK_VADDR) >> BUCKET_SHIFT))
 969 #define BUCKET_ADDR(num) (((num) << BUCKET_SHIFT) + SUN4C_LOCK_VADDR)
 970 #define BUCKET_PTE(page)       \
 971         ((((page) - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(SUN4C_PAGE_KERNEL))
 972 #define BUCKET_PTE_PAGE(pte)   \
 973         (PAGE_OFFSET + (((pte) & SUN4C_PFN_MASK) << PAGE_SHIFT))
 974
 975 static void get_locked_segment(unsigned long addr)
 976 {
 977         struct sun4c_mmu_entry *stolen;
 978         unsigned long flags;
 979
 980         local_irq_save(flags);
 981         addr &= SUN4C_REAL_PGDIR_MASK;
 982         stolen = sun4c_user_strategy();
 983         max_user_taken_entries--;
 984         stolen->vaddr = addr;
 985         flush_user_windows();
 986         sun4c_kernel_map(stolen);
 987         local_irq_restore(flags);
 988 }
 989
 990 static void free_locked_segment(unsigned long addr)
 991 {
 992         struct sun4c_mmu_entry *entry;
 993         unsigned long flags;
 994         unsigned char pseg;
 995
 996         local_irq_save(flags);
 997         addr &= SUN4C_REAL_PGDIR_MASK;
 998         pseg = sun4c_get_segmap(addr);
 999         entry = &mmu_entry_pool[pseg];
1000
1001         flush_user_windows();
1002         sun4c_flush_segment(addr);
1003         sun4c_kernel_unmap(entry);
1004         add_ring(&sun4c_ufree_ring, entry);
1005         max_user_taken_entries++;
1006         local_irq_restore(flags);
1007 }
1008
1009 static inline void garbage_collect(int entry)
1010 {
1011         int start, end;
1012
1013         /* 32 buckets per segment... */
1014         entry &= ~31;
1015         start = entry;
1016         for (end = (start + 32); start < end; start++)
1017                 if (sun4c_bucket[start] != BUCKET_EMPTY)
1018                         return;
1019
1020         /* Entire segment empty, release it. */
1021         free_locked_segment(BUCKET_ADDR(entry));
1022 }
1023
1024 static struct thread_info *sun4c_alloc_thread_info(void)
1025 {
1026         unsigned long addr, pages;
1027         int entry;
1028
1029         pages = __get_free_pages(GFP_KERNEL, THREAD_INFO_ORDER);
1030         if (!pages)
1031                 return NULL;
1032
1033         for (entry = sun4c_lowbucket_avail; entry < NR_TASK_BUCKETS; entry++)
1034                 if (sun4c_bucket[entry] == BUCKET_EMPTY)
1035                         break;
1036         if (entry == NR_TASK_BUCKETS) {
1037                 free_pages(pages, THREAD_INFO_ORDER);
1038                 return NULL;
1039         }
1040         if (entry >= sun4c_lowbucket_avail)
1041                 sun4c_lowbucket_avail = entry + 1;
1042
1043         addr = BUCKET_ADDR(entry);
1044         sun4c_bucket[entry] = (union task_union *) addr;
1045         if(sun4c_get_segmap(addr) == invalid_segment)
1046                 get_locked_segment(addr);
1047
1048         /* We are changing the virtual color of the page(s)
1049          * so we must flush the cache to guarantee consistency.
1050          */
1051         sun4c_flush_page(pages);
1052 #ifndef CONFIG_SUN4
1053         sun4c_flush_page(pages + PAGE_SIZE);
1054 #endif
1055
1056         sun4c_put_pte(addr, BUCKET_PTE(pages));
1057 #ifndef CONFIG_SUN4
1058         sun4c_put_pte(addr + PAGE_SIZE, BUCKET_PTE(pages + PAGE_SIZE));
1059 #endif
1060
1061 #ifdef CONFIG_DEBUG_STACK_USAGE
1062         memset((void *)addr, 0, PAGE_SIZE << THREAD_INFO_ORDER);
1063 #endif /* DEBUG_STACK_USAGE */
1064
1065         return (struct thread_info *) addr;
1066 }
1067
1068 static void sun4c_free_thread_info(struct thread_info *ti)
1069 {
1070         unsigned long tiaddr = (unsigned long) ti;
1071         unsigned long pages = BUCKET_PTE_PAGE(sun4c_get_pte(tiaddr));
1072         int entry = BUCKET_NUM(tiaddr);
1073
1074         /* We are deleting a mapping, so the flush here is mandatory. */
1075         sun4c_flush_page(tiaddr);
1076 #ifndef CONFIG_SUN4
1077         sun4c_flush_page(tiaddr + PAGE_SIZE);
1078 #endif
1079         sun4c_put_pte(tiaddr, 0);
1080 #ifndef CONFIG_SUN4
1081         sun4c_put_pte(tiaddr + PAGE_SIZE, 0);
1082 #endif
1083         sun4c_bucket[entry] = BUCKET_EMPTY;
1084         if (entry < sun4c_lowbucket_avail)
1085                 sun4c_lowbucket_avail = entry;
1086
1087         free_pages(pages, THREAD_INFO_ORDER);
1088         garbage_collect(entry);
1089 }
1090
1091 static void __init sun4c_init_buckets(void)
1092 {
1093         int entry;
1094
1095         if (sizeof(union thread_union) != (PAGE_SIZE << THREAD_INFO_ORDER)) {
1096                 extern void thread_info_size_is_bolixed_pete(void);
1097                 thread_info_size_is_bolixed_pete();
1098         }
1099
1100         for (entry = 0; entry < NR_TASK_BUCKETS; entry++)
1101                 sun4c_bucket[entry] = BUCKET_EMPTY;
1102         sun4c_lowbucket_avail = 0;
1103 }
1104
1105 static unsigned long sun4c_iobuffer_start;
1106 static unsigned long sun4c_iobuffer_end;
1107 static unsigned long sun4c_iobuffer_high;
1108 static unsigned long *sun4c_iobuffer_map;
1109 static int iobuffer_map_size;
1110
1111 /*
1112  * Alias our pages so they do not cause a trap.
1113  * Also one page may be aliased into several I/O areas and we may
1114  * finish these I/O separately.
1115  */
1116 static char *sun4c_lockarea(char *vaddr, unsigned long size)
1117 {
1118         unsigned long base, scan;
1119         unsigned long npages;
1120         unsigned long vpage;
1121         unsigned long pte;
1122         unsigned long apage;
1123         unsigned long high;
1124         unsigned long flags;
1125
1126         npages = (((unsigned long)vaddr & ~PAGE_MASK) +
1127                   size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
1128
1129         scan = 0;
1130         local_irq_save(flags);
1131         for (;;) {
1132                 scan = find_next_zero_bit(sun4c_iobuffer_map,
1133                                           iobuffer_map_size, scan);
1134                 if ((base = scan) + npages > iobuffer_map_size) goto abend;
1135                 for (;;) {
1136                         if (scan >= base + npages) goto found;
1137                         if (test_bit(scan, sun4c_iobuffer_map)) break;
1138                         scan++;
1139                 }
1140         }
1141
1142 found:
1143         high = ((base + npages) << PAGE_SHIFT) + sun4c_iobuffer_start;
1144         high = SUN4C_REAL_PGDIR_ALIGN(high);
1145         while (high > sun4c_iobuffer_high) {
1146                 get_locked_segment(sun4c_iobuffer_high);
1147                 sun4c_iobuffer_high += SUN4C_REAL_PGDIR_SIZE;
1148         }
1149
1150         vpage = ((unsigned long) vaddr) & PAGE_MASK;
1151         for (scan = base; scan < base+npages; scan++) {
1152                 pte = ((vpage-PAGE_OFFSET) >> PAGE_SHIFT);
1153                 pte |= pgprot_val(SUN4C_PAGE_KERNEL);
1154                 pte |= _SUN4C_PAGE_NOCACHE;
1155                 set_bit(scan, sun4c_iobuffer_map);
1156                 apage = (scan << PAGE_SHIFT) + sun4c_iobuffer_start;
1157
1158                 /* Flush original mapping so we see the right things later. */
1159                 sun4c_flush_page(vpage);
1160
1161                 sun4c_put_pte(apage, pte);
1162                 vpage += PAGE_SIZE;
1163         }
1164         local_irq_restore(flags);
1165         return (char *) ((base << PAGE_SHIFT) + sun4c_iobuffer_start +
1166                          (((unsigned long) vaddr) & ~PAGE_MASK));
1167
1168 abend:
1169         local_irq_restore(flags);
1170         printk("DMA vaddr=0x%p size=%08lx\n", vaddr, size);
1171         panic("Out of iobuffer table");
1172         return NULL;
1173 }
1174
1175 static void sun4c_unlockarea(char *vaddr, unsigned long size)
1176 {
1177         unsigned long vpage, npages;
1178         unsigned long flags;
1179         int scan, high;
1180
1181         vpage = (unsigned long)vaddr & PAGE_MASK;
1182         npages = (((unsigned long)vaddr & ~PAGE_MASK) +
1183                   size + (PAGE_SIZE-1)) >> PAGE_SHIFT;
1184
1185         local_irq_save(flags);
1186         while (npages != 0) {
1187                 --npages;
1188
1189                 /* This mapping is marked non-cachable, no flush necessary. */
1190                 sun4c_put_pte(vpage, 0);
1191                 clear_bit((vpage - sun4c_iobuffer_start) >> PAGE_SHIFT,
1192                           sun4c_iobuffer_map);
1193                 vpage += PAGE_SIZE;
1194         }
1195
1196         /* garbage collect */
1197         scan = (sun4c_iobuffer_high - sun4c_iobuffer_start) >> PAGE_SHIFT;
1198         while (scan >= 0 && !sun4c_iobuffer_map[scan >> 5])
1199                 scan -= 32;
1200         scan += 32;
1201         high = sun4c_iobuffer_start + (scan << PAGE_SHIFT);
1202         high = SUN4C_REAL_PGDIR_ALIGN(high) + SUN4C_REAL_PGDIR_SIZE;
1203         while (high < sun4c_iobuffer_high) {
1204                 sun4c_iobuffer_high -= SUN4C_REAL_PGDIR_SIZE;
1205                 free_locked_segment(sun4c_iobuffer_high);
1206         }
1207         local_irq_restore(flags);
1208 }
1209
1210 /* Note the scsi code at init time passes to here buffers
1211  * which sit on the kernel stack, those are already locked
1212  * by implication and fool the page locking code above
1213  * if passed to by mistake.
1214  */
1215 static __u32 sun4c_get_scsi_one(char *bufptr, unsigned long len, struct sbus_bus *sbus)
1216 {
1217         unsigned long page;
1218
1219         page = ((unsigned long)bufptr) & PAGE_MASK;
1220         if (!virt_addr_valid(page)) {
1221                 sun4c_flush_page(page);
1222                 return (__u32)bufptr; /* already locked */
1223         }
1224         return (__u32)sun4c_lockarea(bufptr, len);
1225 }
1226
1227 static void sun4c_get_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
1228 {
1229         while (sz != 0) {
1230                 --sz;
1231                 sg->dvma_address = (__u32)sun4c_lockarea(sg_virt(sg), sg->length);
1232                 sg->dvma_length = sg->length;
1233                 sg = sg_next(sg);
1234         }
1235 }
1236
1237 static void sun4c_release_scsi_one(__u32 bufptr, unsigned long len, struct sbus_bus *sbus)
1238 {
1239         if (bufptr < sun4c_iobuffer_start)
1240                 return; /* On kernel stack or similar, see above */
1241         sun4c_unlockarea((char *)bufptr, len);
1242 }
1243
1244 static void sun4c_release_scsi_sgl(struct scatterlist *sg, int sz, struct sbus_bus *sbus)
1245 {
1246         while (sz != 0) {
1247                 --sz;
1248                 sun4c_unlockarea((char *)sg->dvma_address, sg->length);
1249                 sg = sg_next(sg);
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_pmd_bad(pmd_t pmd)
1753 {
1754         return (((pmd_val(pmd) & ~PAGE_MASK) != PGD_TABLE) ||
1755                 (!virt_addr_valid(pmd_val(pmd))));
1756 }
1757
1758 static int sun4c_pmd_present(pmd_t pmd)
1759 {
1760         return ((pmd_val(pmd) & PGD_PRESENT) != 0);
1761 }
1762
1763 #if 0 /* if PMD takes one word */
1764 static void sun4c_pmd_clear(pmd_t *pmdp)        { *pmdp = __pmd(0); }
1765 #else /* if pmd_t is a longish aggregate */
1766 static void sun4c_pmd_clear(pmd_t *pmdp) {
1767         memset((void *)pmdp, 0, sizeof(pmd_t));
1768 }
1769 #endif
1770
1771 static int sun4c_pgd_none(pgd_t pgd)            { return 0; }
1772 static int sun4c_pgd_bad(pgd_t pgd)             { return 0; }
1773 static int sun4c_pgd_present(pgd_t pgd)         { return 1; }
1774 static void sun4c_pgd_clear(pgd_t * pgdp)       { }
1775
1776 /*
1777  * The following only work if pte_present() is true.
1778  * Undefined behaviour if not..
1779  */
1780 static pte_t sun4c_pte_mkwrite(pte_t pte)
1781 {
1782         pte = __pte(pte_val(pte) | _SUN4C_PAGE_WRITE);
1783         if (pte_val(pte) & _SUN4C_PAGE_MODIFIED)
1784                 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
1785         return pte;
1786 }
1787
1788 static pte_t sun4c_pte_mkdirty(pte_t pte)
1789 {
1790         pte = __pte(pte_val(pte) | _SUN4C_PAGE_MODIFIED);
1791         if (pte_val(pte) & _SUN4C_PAGE_WRITE)
1792                 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_WRITE);
1793         return pte;
1794 }
1795
1796 static pte_t sun4c_pte_mkyoung(pte_t pte)
1797 {
1798         pte = __pte(pte_val(pte) | _SUN4C_PAGE_ACCESSED);
1799         if (pte_val(pte) & _SUN4C_PAGE_READ)
1800                 pte = __pte(pte_val(pte) | _SUN4C_PAGE_SILENT_READ);
1801         return pte;
1802 }
1803
1804 /*
1805  * Conversion functions: convert a page and protection to a page entry,
1806  * and a page entry and page directory to the page they refer to.
1807  */
1808 static pte_t sun4c_mk_pte(struct page *page, pgprot_t pgprot)
1809 {
1810         return __pte(page_to_pfn(page) | pgprot_val(pgprot));
1811 }
1812
1813 static pte_t sun4c_mk_pte_phys(unsigned long phys_page, pgprot_t pgprot)
1814 {
1815         return __pte((phys_page >> PAGE_SHIFT) | pgprot_val(pgprot));
1816 }
1817
1818 static pte_t sun4c_mk_pte_io(unsigned long page, pgprot_t pgprot, int space)
1819 {
1820         return __pte(((page - PAGE_OFFSET) >> PAGE_SHIFT) | pgprot_val(pgprot));
1821 }
1822
1823 static unsigned long sun4c_pte_pfn(pte_t pte)
1824 {
1825         return pte_val(pte) & SUN4C_PFN_MASK;
1826 }
1827
1828 static pte_t sun4c_pgoff_to_pte(unsigned long pgoff)
1829 {
1830         return __pte(pgoff | _SUN4C_PAGE_FILE);
1831 }
1832
1833 static unsigned long sun4c_pte_to_pgoff(pte_t pte)
1834 {
1835         return pte_val(pte) & ((1UL << PTE_FILE_MAX_BITS) - 1);
1836 }
1837
1838
1839 static __inline__ unsigned long sun4c_pmd_page_v(pmd_t pmd)
1840 {
1841         return (pmd_val(pmd) & PAGE_MASK);
1842 }
1843
1844 static struct page *sun4c_pmd_page(pmd_t pmd)
1845 {
1846         return virt_to_page(sun4c_pmd_page_v(pmd));
1847 }
1848
1849 static unsigned long sun4c_pgd_page(pgd_t pgd) { return 0; }
1850
1851 /* to find an entry in a page-table-directory */
1852 static inline pgd_t *sun4c_pgd_offset(struct mm_struct * mm, unsigned long address)
1853 {
1854         return mm->pgd + (address >> SUN4C_PGDIR_SHIFT);
1855 }
1856
1857 /* Find an entry in the second-level page table.. */
1858 static pmd_t *sun4c_pmd_offset(pgd_t * dir, unsigned long address)
1859 {
1860         return (pmd_t *) dir;
1861 }
1862
1863 /* Find an entry in the third-level page table.. */
1864 pte_t *sun4c_pte_offset_kernel(pmd_t * dir, unsigned long address)
1865 {
1866         return (pte_t *) sun4c_pmd_page_v(*dir) +
1867                         ((address >> PAGE_SHIFT) & (SUN4C_PTRS_PER_PTE - 1));
1868 }
1869
1870 static unsigned long sun4c_swp_type(swp_entry_t entry)
1871 {
1872         return (entry.val & SUN4C_SWP_TYPE_MASK);
1873 }
1874
1875 static unsigned long sun4c_swp_offset(swp_entry_t entry)
1876 {
1877         return (entry.val >> SUN4C_SWP_OFF_SHIFT) & SUN4C_SWP_OFF_MASK;
1878 }
1879
1880 static swp_entry_t sun4c_swp_entry(unsigned long type, unsigned long offset)
1881 {
1882         return (swp_entry_t) {
1883                   (offset & SUN4C_SWP_OFF_MASK) << SUN4C_SWP_OFF_SHIFT
1884                 | (type & SUN4C_SWP_TYPE_MASK) };
1885 }
1886
1887 static void sun4c_free_pte_slow(pte_t *pte)
1888 {
1889         free_page((unsigned long)pte);
1890 }
1891
1892 static void sun4c_free_pgd_slow(pgd_t *pgd)
1893 {
1894         free_page((unsigned long)pgd);
1895 }
1896
1897 static pgd_t *sun4c_get_pgd_fast(void)
1898 {
1899         unsigned long *ret;
1900
1901         if ((ret = pgd_quicklist) != NULL) {
1902                 pgd_quicklist = (unsigned long *)(*ret);
1903                 ret[0] = ret[1];
1904                 pgtable_cache_size--;
1905         } else {
1906                 pgd_t *init;
1907
1908                 ret = (unsigned long *)__get_free_page(GFP_KERNEL);
1909                 memset (ret, 0, (KERNBASE / SUN4C_PGDIR_SIZE) * sizeof(pgd_t));
1910                 init = sun4c_pgd_offset(&init_mm, 0);
1911                 memcpy (((pgd_t *)ret) + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
1912                         (PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
1913         }
1914         return (pgd_t *)ret;
1915 }
1916
1917 static void sun4c_free_pgd_fast(pgd_t *pgd)
1918 {
1919         *(unsigned long *)pgd = (unsigned long) pgd_quicklist;
1920         pgd_quicklist = (unsigned long *) pgd;
1921         pgtable_cache_size++;
1922 }
1923
1924
1925 static __inline__ pte_t *
1926 sun4c_pte_alloc_one_fast(struct mm_struct *mm, unsigned long address)
1927 {
1928         unsigned long *ret;
1929
1930         if ((ret = (unsigned long *)pte_quicklist) != NULL) {
1931                 pte_quicklist = (unsigned long *)(*ret);
1932                 ret[0] = ret[1];
1933                 pgtable_cache_size--;
1934         }
1935         return (pte_t *)ret;
1936 }
1937
1938 static pte_t *sun4c_pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
1939 {
1940         pte_t *pte;
1941
1942         if ((pte = sun4c_pte_alloc_one_fast(mm, address)) != NULL)
1943                 return pte;
1944
1945         pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT);
1946         if (pte)
1947                 memset(pte, 0, PAGE_SIZE);
1948         return pte;
1949 }
1950
1951 static struct page *sun4c_pte_alloc_one(struct mm_struct *mm, unsigned long address)
1952 {
1953         pte_t *pte = sun4c_pte_alloc_one_kernel(mm, address);
1954         if (pte == NULL)
1955                 return NULL;
1956         return virt_to_page(pte);
1957 }
1958
1959 static __inline__ void sun4c_free_pte_fast(pte_t *pte)
1960 {
1961         *(unsigned long *)pte = (unsigned long) pte_quicklist;
1962         pte_quicklist = (unsigned long *) pte;
1963         pgtable_cache_size++;
1964 }
1965
1966 static void sun4c_pte_free(struct page *pte)
1967 {
1968         sun4c_free_pte_fast(page_address(pte));
1969 }
1970
1971 /*
1972  * allocating and freeing a pmd is trivial: the 1-entry pmd is
1973  * inside the pgd, so has no extra memory associated with it.
1974  */
1975 static pmd_t *sun4c_pmd_alloc_one(struct mm_struct *mm, unsigned long address)
1976 {
1977         BUG();
1978         return NULL;
1979 }
1980
1981 static void sun4c_free_pmd_fast(pmd_t * pmd) { }
1982
1983 static void sun4c_check_pgt_cache(int low, int high)
1984 {
1985         if (pgtable_cache_size > high) {
1986                 do {
1987                         if (pgd_quicklist)
1988                                 sun4c_free_pgd_slow(sun4c_get_pgd_fast());
1989                         if (pte_quicklist)
1990                                 sun4c_free_pte_slow(sun4c_pte_alloc_one_fast(NULL, 0));
1991                 } while (pgtable_cache_size > low);
1992         }
1993 }
1994
1995 /* An experiment, turn off by default for now... -DaveM */
1996 #define SUN4C_PRELOAD_PSEG
1997
1998 void sun4c_update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t pte)
1999 {
2000         unsigned long flags;
2001         int pseg;
2002
2003         if (vma->vm_mm->context == NO_CONTEXT)
2004                 return;
2005
2006         local_irq_save(flags);
2007         address &= PAGE_MASK;
2008         if ((pseg = sun4c_get_segmap(address)) == invalid_segment) {
2009                 struct sun4c_mmu_entry *entry = sun4c_user_strategy();
2010                 struct mm_struct *mm = vma->vm_mm;
2011                 unsigned long start, end;
2012
2013                 entry->vaddr = start = (address & SUN4C_REAL_PGDIR_MASK);
2014                 entry->ctx = mm->context;
2015                 add_ring_ordered(sun4c_context_ring + mm->context, entry);
2016                 sun4c_put_segmap(entry->vaddr, entry->pseg);
2017                 end = start + SUN4C_REAL_PGDIR_SIZE;
2018                 while (start < end) {
2019 #ifdef SUN4C_PRELOAD_PSEG
2020                         pgd_t *pgdp = sun4c_pgd_offset(mm, start);
2021                         pte_t *ptep;
2022
2023                         if (!pgdp)
2024                                 goto no_mapping;
2025                         ptep = sun4c_pte_offset_kernel((pmd_t *) pgdp, start);
2026                         if (!ptep || !(pte_val(*ptep) & _SUN4C_PAGE_PRESENT))
2027                                 goto no_mapping;
2028                         sun4c_put_pte(start, pte_val(*ptep));
2029                         goto next;
2030
2031                 no_mapping:
2032 #endif
2033                         sun4c_put_pte(start, 0);
2034 #ifdef SUN4C_PRELOAD_PSEG
2035                 next:
2036 #endif
2037                         start += PAGE_SIZE;
2038                 }
2039 #ifndef SUN4C_PRELOAD_PSEG
2040                 sun4c_put_pte(address, pte_val(pte));
2041 #endif
2042                 local_irq_restore(flags);
2043                 return;
2044         } else {
2045                 struct sun4c_mmu_entry *entry = &mmu_entry_pool[pseg];
2046
2047                 remove_lru(entry);
2048                 add_lru(entry);
2049         }
2050
2051         sun4c_put_pte(address, pte_val(pte));
2052         local_irq_restore(flags);
2053 }
2054
2055 extern void sparc_context_init(int);
2056 extern unsigned long end;
2057 extern unsigned long bootmem_init(unsigned long *pages_avail);
2058 extern unsigned long last_valid_pfn;
2059
2060 void __init sun4c_paging_init(void)
2061 {
2062         int i, cnt;
2063         unsigned long kernel_end, vaddr;
2064         extern struct resource sparc_iomap;
2065         unsigned long end_pfn, pages_avail;
2066
2067         kernel_end = (unsigned long) &end;
2068         kernel_end = SUN4C_REAL_PGDIR_ALIGN(kernel_end);
2069
2070         pages_avail = 0;
2071         last_valid_pfn = bootmem_init(&pages_avail);
2072         end_pfn = last_valid_pfn;
2073
2074         sun4c_probe_mmu();
2075         invalid_segment = (num_segmaps - 1);
2076         sun4c_init_mmu_entry_pool();
2077         sun4c_init_rings();
2078         sun4c_init_map_kernelprom(kernel_end);
2079         sun4c_init_clean_mmu(kernel_end);
2080         sun4c_init_fill_kernel_ring(SUN4C_KERNEL_BUCKETS);
2081         sun4c_init_lock_area(sparc_iomap.start, IOBASE_END);
2082         sun4c_init_lock_area(DVMA_VADDR, DVMA_END);
2083         sun4c_init_lock_areas();
2084         sun4c_init_fill_user_ring();
2085
2086         sun4c_set_context(0);
2087         memset(swapper_pg_dir, 0, PAGE_SIZE);
2088         memset(pg0, 0, PAGE_SIZE);
2089         memset(pg1, 0, PAGE_SIZE);
2090         memset(pg2, 0, PAGE_SIZE);
2091         memset(pg3, 0, PAGE_SIZE);
2092
2093         /* Save work later. */
2094         vaddr = VMALLOC_START;
2095         swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg0);
2096         vaddr += SUN4C_PGDIR_SIZE;
2097         swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg1);
2098         vaddr += SUN4C_PGDIR_SIZE;
2099         swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg2);
2100         vaddr += SUN4C_PGDIR_SIZE;
2101         swapper_pg_dir[vaddr>>SUN4C_PGDIR_SHIFT] = __pgd(PGD_TABLE | (unsigned long) pg3);
2102         sun4c_init_ss2_cache_bug();
2103         sparc_context_init(num_contexts);
2104
2105         {
2106                 unsigned long zones_size[MAX_NR_ZONES];
2107                 unsigned long zholes_size[MAX_NR_ZONES];
2108                 unsigned long npages;
2109                 int znum;
2110
2111                 for (znum = 0; znum < MAX_NR_ZONES; znum++)
2112                         zones_size[znum] = zholes_size[znum] = 0;
2113
2114                 npages = max_low_pfn - pfn_base;
2115
2116                 zones_size[ZONE_DMA] = npages;
2117                 zholes_size[ZONE_DMA] = npages - pages_avail;
2118
2119                 npages = highend_pfn - max_low_pfn;
2120                 zones_size[ZONE_HIGHMEM] = npages;
2121                 zholes_size[ZONE_HIGHMEM] = npages - calc_highpages();
2122
2123                 free_area_init_node(0, &contig_page_data, zones_size,
2124                                     pfn_base, zholes_size);
2125         }
2126
2127         cnt = 0;
2128         for (i = 0; i < num_segmaps; i++)
2129                 if (mmu_entry_pool[i].locked)
2130                         cnt++;
2131
2132         max_user_taken_entries = num_segmaps - cnt - 40 - 1;
2133
2134         printk("SUN4C: %d mmu entries for the kernel\n", cnt);
2135 }
2136
2137 static pgprot_t sun4c_pgprot_noncached(pgprot_t prot)
2138 {
2139         prot |= __pgprot(_SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE);
2140
2141         return prot;
2142 }
2143
2144 /* Load up routines and constants for sun4c mmu */
2145 void __init ld_mmu_sun4c(void)
2146 {
2147         extern void ___xchg32_sun4c(void);
2148
2149         printk("Loading sun4c MMU routines\n");
2150
2151         /* First the constants */
2152         BTFIXUPSET_SIMM13(pgdir_shift, SUN4C_PGDIR_SHIFT);
2153         BTFIXUPSET_SETHI(pgdir_size, SUN4C_PGDIR_SIZE);
2154         BTFIXUPSET_SETHI(pgdir_mask, SUN4C_PGDIR_MASK);
2155
2156         BTFIXUPSET_SIMM13(ptrs_per_pmd, SUN4C_PTRS_PER_PMD);
2157         BTFIXUPSET_SIMM13(ptrs_per_pgd, SUN4C_PTRS_PER_PGD);
2158         BTFIXUPSET_SIMM13(user_ptrs_per_pgd, KERNBASE / SUN4C_PGDIR_SIZE);
2159
2160         BTFIXUPSET_INT(page_none, pgprot_val(SUN4C_PAGE_NONE));
2161         PAGE_SHARED = pgprot_val(SUN4C_PAGE_SHARED);
2162         BTFIXUPSET_INT(page_copy, pgprot_val(SUN4C_PAGE_COPY));
2163         BTFIXUPSET_INT(page_readonly, pgprot_val(SUN4C_PAGE_READONLY));
2164         BTFIXUPSET_INT(page_kernel, pgprot_val(SUN4C_PAGE_KERNEL));
2165         page_kernel = pgprot_val(SUN4C_PAGE_KERNEL);
2166
2167         /* Functions */
2168         BTFIXUPSET_CALL(pgprot_noncached, sun4c_pgprot_noncached, BTFIXUPCALL_NORM);
2169         BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4c, BTFIXUPCALL_NORM);
2170         BTFIXUPSET_CALL(do_check_pgt_cache, sun4c_check_pgt_cache, BTFIXUPCALL_NORM);
2171
2172         BTFIXUPSET_CALL(flush_cache_all, sun4c_flush_cache_all, BTFIXUPCALL_NORM);
2173
2174         if (sun4c_vacinfo.do_hwflushes) {
2175                 BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_hw, BTFIXUPCALL_NORM);
2176                 BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_hw, BTFIXUPCALL_NORM);
2177                 BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_hw, BTFIXUPCALL_NORM);
2178         } else {
2179                 BTFIXUPSET_CALL(sun4c_flush_page, sun4c_flush_page_sw, BTFIXUPCALL_NORM);
2180                 BTFIXUPSET_CALL(sun4c_flush_segment, sun4c_flush_segment_sw, BTFIXUPCALL_NORM);
2181                 BTFIXUPSET_CALL(sun4c_flush_context, sun4c_flush_context_sw, BTFIXUPCALL_NORM);
2182         }
2183
2184         BTFIXUPSET_CALL(flush_tlb_mm, sun4c_flush_tlb_mm, BTFIXUPCALL_NORM);
2185         BTFIXUPSET_CALL(flush_cache_mm, sun4c_flush_cache_mm, BTFIXUPCALL_NORM);
2186         BTFIXUPSET_CALL(destroy_context, sun4c_destroy_context, BTFIXUPCALL_NORM);
2187         BTFIXUPSET_CALL(switch_mm, sun4c_switch_mm, BTFIXUPCALL_NORM);
2188         BTFIXUPSET_CALL(flush_cache_page, sun4c_flush_cache_page, BTFIXUPCALL_NORM);
2189         BTFIXUPSET_CALL(flush_tlb_page, sun4c_flush_tlb_page, BTFIXUPCALL_NORM);
2190         BTFIXUPSET_CALL(flush_tlb_range, sun4c_flush_tlb_range, BTFIXUPCALL_NORM);
2191         BTFIXUPSET_CALL(flush_cache_range, sun4c_flush_cache_range, BTFIXUPCALL_NORM);
2192         BTFIXUPSET_CALL(__flush_page_to_ram, sun4c_flush_page_to_ram, BTFIXUPCALL_NORM);
2193         BTFIXUPSET_CALL(flush_tlb_all, sun4c_flush_tlb_all, BTFIXUPCALL_NORM);
2194
2195         BTFIXUPSET_CALL(flush_sig_insns, sun4c_flush_sig_insns, BTFIXUPCALL_NOP);
2196
2197         BTFIXUPSET_CALL(set_pte, sun4c_set_pte, BTFIXUPCALL_STO1O0);
2198
2199         /* The 2.4.18 code does not set this on sun4c, how does it work? XXX */
2200         /* BTFIXUPSET_SETHI(none_mask, 0x00000000); */  /* Defaults to zero? */
2201
2202         BTFIXUPSET_CALL(pte_pfn, sun4c_pte_pfn, BTFIXUPCALL_NORM);
2203 #if 0 /* PAGE_SHIFT <= 12 */ /* Eek. Investigate. XXX */
2204         BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_ANDNINT(PAGE_SIZE - 1));
2205 #else
2206         BTFIXUPSET_CALL(pmd_page, sun4c_pmd_page, BTFIXUPCALL_NORM);
2207 #endif
2208         BTFIXUPSET_CALL(pmd_set, sun4c_pmd_set, BTFIXUPCALL_NORM);
2209         BTFIXUPSET_CALL(pmd_populate, sun4c_pmd_populate, BTFIXUPCALL_NORM);
2210
2211         BTFIXUPSET_CALL(pte_present, sun4c_pte_present, BTFIXUPCALL_NORM);
2212         BTFIXUPSET_CALL(pte_clear, sun4c_pte_clear, BTFIXUPCALL_STG0O0);
2213
2214         BTFIXUPSET_CALL(pmd_bad, sun4c_pmd_bad, BTFIXUPCALL_NORM);
2215         BTFIXUPSET_CALL(pmd_present, sun4c_pmd_present, BTFIXUPCALL_NORM);
2216         BTFIXUPSET_CALL(pmd_clear, sun4c_pmd_clear, BTFIXUPCALL_STG0O0);
2217
2218         BTFIXUPSET_CALL(pgd_none, sun4c_pgd_none, BTFIXUPCALL_RETINT(0));
2219         BTFIXUPSET_CALL(pgd_bad, sun4c_pgd_bad, BTFIXUPCALL_RETINT(0));
2220         BTFIXUPSET_CALL(pgd_present, sun4c_pgd_present, BTFIXUPCALL_RETINT(1));
2221         BTFIXUPSET_CALL(pgd_clear, sun4c_pgd_clear, BTFIXUPCALL_NOP);
2222
2223         BTFIXUPSET_CALL(mk_pte, sun4c_mk_pte, BTFIXUPCALL_NORM);
2224         BTFIXUPSET_CALL(mk_pte_phys, sun4c_mk_pte_phys, BTFIXUPCALL_NORM);
2225         BTFIXUPSET_CALL(mk_pte_io, sun4c_mk_pte_io, BTFIXUPCALL_NORM);
2226
2227         BTFIXUPSET_INT(pte_modify_mask, _SUN4C_PAGE_CHG_MASK);
2228         BTFIXUPSET_CALL(pmd_offset, sun4c_pmd_offset, BTFIXUPCALL_NORM);
2229         BTFIXUPSET_CALL(pte_offset_kernel, sun4c_pte_offset_kernel, BTFIXUPCALL_NORM);
2230         BTFIXUPSET_CALL(free_pte_fast, sun4c_free_pte_fast, BTFIXUPCALL_NORM);
2231         BTFIXUPSET_CALL(pte_free, sun4c_pte_free, BTFIXUPCALL_NORM);
2232         BTFIXUPSET_CALL(pte_alloc_one_kernel, sun4c_pte_alloc_one_kernel, BTFIXUPCALL_NORM);
2233         BTFIXUPSET_CALL(pte_alloc_one, sun4c_pte_alloc_one, BTFIXUPCALL_NORM);
2234         BTFIXUPSET_CALL(free_pmd_fast, sun4c_free_pmd_fast, BTFIXUPCALL_NOP);
2235         BTFIXUPSET_CALL(pmd_alloc_one, sun4c_pmd_alloc_one, BTFIXUPCALL_RETO0);
2236         BTFIXUPSET_CALL(free_pgd_fast, sun4c_free_pgd_fast, BTFIXUPCALL_NORM);
2237         BTFIXUPSET_CALL(get_pgd_fast, sun4c_get_pgd_fast, BTFIXUPCALL_NORM);
2238
2239         BTFIXUPSET_HALF(pte_writei, _SUN4C_PAGE_WRITE);
2240         BTFIXUPSET_HALF(pte_dirtyi, _SUN4C_PAGE_MODIFIED);
2241         BTFIXUPSET_HALF(pte_youngi, _SUN4C_PAGE_ACCESSED);
2242         BTFIXUPSET_HALF(pte_filei, _SUN4C_PAGE_FILE);
2243         BTFIXUPSET_HALF(pte_wrprotecti, _SUN4C_PAGE_WRITE|_SUN4C_PAGE_SILENT_WRITE);
2244         BTFIXUPSET_HALF(pte_mkcleani, _SUN4C_PAGE_MODIFIED|_SUN4C_PAGE_SILENT_WRITE);
2245         BTFIXUPSET_HALF(pte_mkoldi, _SUN4C_PAGE_ACCESSED|_SUN4C_PAGE_SILENT_READ);
2246         BTFIXUPSET_CALL(pte_mkwrite, sun4c_pte_mkwrite, BTFIXUPCALL_NORM);
2247         BTFIXUPSET_CALL(pte_mkdirty, sun4c_pte_mkdirty, BTFIXUPCALL_NORM);
2248         BTFIXUPSET_CALL(pte_mkyoung, sun4c_pte_mkyoung, BTFIXUPCALL_NORM);
2249         BTFIXUPSET_CALL(update_mmu_cache, sun4c_update_mmu_cache, BTFIXUPCALL_NORM);
2250
2251         BTFIXUPSET_CALL(pte_to_pgoff, sun4c_pte_to_pgoff, BTFIXUPCALL_NORM);
2252         BTFIXUPSET_CALL(pgoff_to_pte, sun4c_pgoff_to_pte, BTFIXUPCALL_NORM);
2253
2254         BTFIXUPSET_CALL(mmu_lockarea, sun4c_lockarea, BTFIXUPCALL_NORM);
2255         BTFIXUPSET_CALL(mmu_unlockarea, sun4c_unlockarea, BTFIXUPCALL_NORM);
2256
2257         BTFIXUPSET_CALL(mmu_get_scsi_one, sun4c_get_scsi_one, BTFIXUPCALL_NORM);
2258         BTFIXUPSET_CALL(mmu_get_scsi_sgl, sun4c_get_scsi_sgl, BTFIXUPCALL_NORM);
2259         BTFIXUPSET_CALL(mmu_release_scsi_one, sun4c_release_scsi_one, BTFIXUPCALL_NORM);
2260         BTFIXUPSET_CALL(mmu_release_scsi_sgl, sun4c_release_scsi_sgl, BTFIXUPCALL_NORM);
2261
2262         BTFIXUPSET_CALL(mmu_map_dma_area, sun4c_map_dma_area, BTFIXUPCALL_NORM);
2263         BTFIXUPSET_CALL(mmu_unmap_dma_area, sun4c_unmap_dma_area, BTFIXUPCALL_NORM);
2264         BTFIXUPSET_CALL(mmu_translate_dvma, sun4c_translate_dvma, BTFIXUPCALL_NORM);
2265
2266         BTFIXUPSET_CALL(sparc_mapiorange, sun4c_mapiorange, BTFIXUPCALL_NORM);
2267         BTFIXUPSET_CALL(sparc_unmapiorange, sun4c_unmapiorange, BTFIXUPCALL_NORM);
2268
2269         BTFIXUPSET_CALL(__swp_type, sun4c_swp_type, BTFIXUPCALL_NORM);
2270         BTFIXUPSET_CALL(__swp_offset, sun4c_swp_offset, BTFIXUPCALL_NORM);
2271         BTFIXUPSET_CALL(__swp_entry, sun4c_swp_entry, BTFIXUPCALL_NORM);
2272
2273         BTFIXUPSET_CALL(alloc_thread_info, sun4c_alloc_thread_info, BTFIXUPCALL_NORM);
2274         BTFIXUPSET_CALL(free_thread_info, sun4c_free_thread_info, BTFIXUPCALL_NORM);
2275
2276         BTFIXUPSET_CALL(mmu_info, sun4c_mmu_info, BTFIXUPCALL_NORM);
2277
2278         /* These should _never_ get called with two level tables. */
2279         BTFIXUPSET_CALL(pgd_set, sun4c_pgd_set, BTFIXUPCALL_NOP);
2280         BTFIXUPSET_CALL(pgd_page_vaddr, sun4c_pgd_page, BTFIXUPCALL_RETO0);
2281 }