git.oblomov.eu Git - linux-2.6/blob - arch/powerpc/platforms/iseries/setup.c

   1 /*
   2  *    Copyright (c) 2000 Mike Corrigan <mikejc@us.ibm.com>
   3  *    Copyright (c) 1999-2000 Grant Erickson <grant@lcse.umn.edu>
   4  *
   5  *    Description:
   6  *      Architecture- / platform-specific boot-time initialization code for
   7  *      the IBM iSeries LPAR.  Adapted from original code by Grant Erickson and
   8  *      code by Gary Thomas, Cort Dougan <cort@fsmlabs.com>, and Dan Malek
   9  *      <dan@net4x.com>.
  10  *
  11  *      This program is free software; you can redistribute it and/or
  12  *      modify it under the terms of the GNU General Public License
  13  *      as published by the Free Software Foundation; either version
  14  *      2 of the License, or (at your option) any later version.
  15  */
  16
  17 #undef DEBUG
  18
  19 #include <linux/config.h>
  20 #include <linux/init.h>
  21 #include <linux/threads.h>
  22 #include <linux/smp.h>
  23 #include <linux/param.h>
  24 #include <linux/string.h>
  25 #include <linux/initrd.h>
  26 #include <linux/seq_file.h>
  27 #include <linux/kdev_t.h>
  28 #include <linux/major.h>
  29 #include <linux/root_dev.h>
  30 #include <linux/kernel.h>
  31
  32 #include <asm/processor.h>
  33 #include <asm/machdep.h>
  34 #include <asm/page.h>
  35 #include <asm/mmu.h>
  36 #include <asm/pgtable.h>
  37 #include <asm/mmu_context.h>
  38 #include <asm/cputable.h>
  39 #include <asm/sections.h>
  40 #include <asm/iommu.h>
  41 #include <asm/firmware.h>
  42 #include <asm/system.h>
  43 #include <asm/time.h>
  44 #include <asm/paca.h>
  45 #include <asm/cache.h>
  46 #include <asm/sections.h>
  47 #include <asm/abs_addr.h>
  48 #include <asm/iseries/hv_lp_config.h>
  49 #include <asm/iseries/hv_call_event.h>
  50 #include <asm/iseries/hv_call_xm.h>
  51 #include <asm/iseries/it_lp_queue.h>
  52 #include <asm/iseries/mf.h>
  53 #include <asm/iseries/hv_lp_event.h>
  54 #include <asm/iseries/lpar_map.h>
  55 #include <asm/udbg.h>
  56
  57 #include "naca.h"
  58 #include "setup.h"
  59 #include "irq.h"
  60 #include "vpd_areas.h"
  61 #include "processor_vpd.h"
  62 #include "main_store.h"
  63 #include "call_sm.h"
  64 #include "call_hpt.h"
  65
  66 #ifdef DEBUG
  67 #define DBG(fmt...) udbg_printf(fmt)
  68 #else
  69 #define DBG(fmt...)
  70 #endif
  71
  72 /* Function Prototypes */
  73 static unsigned long build_iSeries_Memory_Map(void);
  74 static void iseries_shared_idle(void);
  75 static void iseries_dedicated_idle(void);
  76 #ifdef CONFIG_PCI
  77 extern void iSeries_pci_final_fixup(void);
  78 #else
  79 static void iSeries_pci_final_fixup(void) { }
  80 #endif
  81
  82 /* Global Variables */
  83 int piranha_simulator;
  84
  85 extern int rd_size;             /* Defined in drivers/block/rd.c */
  86 extern unsigned long embedded_sysmap_start;
  87 extern unsigned long embedded_sysmap_end;
  88
  89 extern unsigned long iSeries_recal_tb;
  90 extern unsigned long iSeries_recal_titan;
  91
  92 static int mf_initialized;
  93
  94 static unsigned long cmd_mem_limit;
  95
  96 struct MemoryBlock {
  97         unsigned long absStart;
  98         unsigned long absEnd;
  99         unsigned long logicalStart;
 100         unsigned long logicalEnd;
 101 };
 102
 103 /*
 104  * Process the main store vpd to determine where the holes in memory are
 105  * and return the number of physical blocks and fill in the array of
 106  * block data.
 107  */
 108 static unsigned long iSeries_process_Condor_mainstore_vpd(
 109                 struct MemoryBlock *mb_array, unsigned long max_entries)
 110 {
 111         unsigned long holeFirstChunk, holeSizeChunks;
 112         unsigned long numMemoryBlocks = 1;
 113         struct IoHriMainStoreSegment4 *msVpd =
 114                 (struct IoHriMainStoreSegment4 *)xMsVpd;
 115         unsigned long holeStart = msVpd->nonInterleavedBlocksStartAdr;
 116         unsigned long holeEnd = msVpd->nonInterleavedBlocksEndAdr;
 117         unsigned long holeSize = holeEnd - holeStart;
 118
 119         printk("Mainstore_VPD: Condor\n");
 120         /*
 121          * Determine if absolute memory has any
 122          * holes so that we can interpret the
 123          * access map we get back from the hypervisor
 124          * correctly.
 125          */
 126         mb_array[0].logicalStart = 0;
 127         mb_array[0].logicalEnd = 0x100000000;
 128         mb_array[0].absStart = 0;
 129         mb_array[0].absEnd = 0x100000000;
 130
 131         if (holeSize) {
 132                 numMemoryBlocks = 2;
 133                 holeStart = holeStart & 0x000fffffffffffff;
 134                 holeStart = addr_to_chunk(holeStart);
 135                 holeFirstChunk = holeStart;
 136                 holeSize = addr_to_chunk(holeSize);
 137                 holeSizeChunks = holeSize;
 138                 printk( "Main store hole: start chunk = %0lx, size = %0lx chunks\n",
 139                                 holeFirstChunk, holeSizeChunks );
 140                 mb_array[0].logicalEnd = holeFirstChunk;
 141                 mb_array[0].absEnd = holeFirstChunk;
 142                 mb_array[1].logicalStart = holeFirstChunk;
 143                 mb_array[1].logicalEnd = 0x100000000 - holeSizeChunks;
 144                 mb_array[1].absStart = holeFirstChunk + holeSizeChunks;
 145                 mb_array[1].absEnd = 0x100000000;
 146         }
 147         return numMemoryBlocks;
 148 }
 149
 150 #define MaxSegmentAreas                 32
 151 #define MaxSegmentAdrRangeBlocks        128
 152 #define MaxAreaRangeBlocks              4
 153
 154 static unsigned long iSeries_process_Regatta_mainstore_vpd(
 155                 struct MemoryBlock *mb_array, unsigned long max_entries)
 156 {
 157         struct IoHriMainStoreSegment5 *msVpdP =
 158                 (struct IoHriMainStoreSegment5 *)xMsVpd;
 159         unsigned long numSegmentBlocks = 0;
 160         u32 existsBits = msVpdP->msAreaExists;
 161         unsigned long area_num;
 162
 163         printk("Mainstore_VPD: Regatta\n");
 164
 165         for (area_num = 0; area_num < MaxSegmentAreas; ++area_num ) {
 166                 unsigned long numAreaBlocks;
 167                 struct IoHriMainStoreArea4 *currentArea;
 168
 169                 if (existsBits & 0x80000000) {
 170                         unsigned long block_num;
 171
 172                         currentArea = &msVpdP->msAreaArray[area_num];
 173                         numAreaBlocks = currentArea->numAdrRangeBlocks;
 174                         printk("ms_vpd: processing area %2ld  blocks=%ld",
 175                                         area_num, numAreaBlocks);
 176                         for (block_num = 0; block_num < numAreaBlocks;
 177                                         ++block_num ) {
 178                                 /* Process an address range block */
 179                                 struct MemoryBlock tempBlock;
 180                                 unsigned long i;
 181
 182                                 tempBlock.absStart =
 183                                         (unsigned long)currentArea->xAdrRangeBlock[block_num].blockStart;
 184                                 tempBlock.absEnd =
 185                                         (unsigned long)currentArea->xAdrRangeBlock[block_num].blockEnd;
 186                                 tempBlock.logicalStart = 0;
 187                                 tempBlock.logicalEnd   = 0;
 188                                 printk("\n          block %ld absStart=%016lx absEnd=%016lx",
 189                                                 block_num, tempBlock.absStart,
 190                                                 tempBlock.absEnd);
 191
 192                                 for (i = 0; i < numSegmentBlocks; ++i) {
 193                                         if (mb_array[i].absStart ==
 194                                                         tempBlock.absStart)
 195                                                 break;
 196                                 }
 197                                 if (i == numSegmentBlocks) {
 198                                         if (numSegmentBlocks == max_entries)
 199                                                 panic("iSeries_process_mainstore_vpd: too many memory blocks");
 200                                         mb_array[numSegmentBlocks] = tempBlock;
 201                                         ++numSegmentBlocks;
 202                                 } else
 203                                         printk(" (duplicate)");
 204                         }
 205                         printk("\n");
 206                 }
 207                 existsBits <<= 1;
 208         }
 209         /* Now sort the blocks found into ascending sequence */
 210         if (numSegmentBlocks > 1) {
 211                 unsigned long m, n;
 212
 213                 for (m = 0; m < numSegmentBlocks - 1; ++m) {
 214                         for (n = numSegmentBlocks - 1; m < n; --n) {
 215                                 if (mb_array[n].absStart <
 216                                                 mb_array[n-1].absStart) {
 217                                         struct MemoryBlock tempBlock;
 218
 219                                         tempBlock = mb_array[n];
 220                                         mb_array[n] = mb_array[n-1];
 221                                         mb_array[n-1] = tempBlock;
 222                                 }
 223                         }
 224                 }
 225         }
 226         /*
 227          * Assign "logical" addresses to each block.  These
 228          * addresses correspond to the hypervisor "bitmap" space.
 229          * Convert all addresses into units of 256K chunks.
 230          */
 231         {
 232         unsigned long i, nextBitmapAddress;
 233
 234         printk("ms_vpd: %ld sorted memory blocks\n", numSegmentBlocks);
 235         nextBitmapAddress = 0;
 236         for (i = 0; i < numSegmentBlocks; ++i) {
 237                 unsigned long length = mb_array[i].absEnd -
 238                         mb_array[i].absStart;
 239
 240                 mb_array[i].logicalStart = nextBitmapAddress;
 241                 mb_array[i].logicalEnd = nextBitmapAddress + length;
 242                 nextBitmapAddress += length;
 243                 printk("          Bitmap range: %016lx - %016lx\n"
 244                                 "        Absolute range: %016lx - %016lx\n",
 245                                 mb_array[i].logicalStart,
 246                                 mb_array[i].logicalEnd,
 247                                 mb_array[i].absStart, mb_array[i].absEnd);
 248                 mb_array[i].absStart = addr_to_chunk(mb_array[i].absStart &
 249                                 0x000fffffffffffff);
 250                 mb_array[i].absEnd = addr_to_chunk(mb_array[i].absEnd &
 251                                 0x000fffffffffffff);
 252                 mb_array[i].logicalStart =
 253                         addr_to_chunk(mb_array[i].logicalStart);
 254                 mb_array[i].logicalEnd = addr_to_chunk(mb_array[i].logicalEnd);
 255         }
 256         }
 257
 258         return numSegmentBlocks;
 259 }
 260
 261 static unsigned long iSeries_process_mainstore_vpd(struct MemoryBlock *mb_array,
 262                 unsigned long max_entries)
 263 {
 264         unsigned long i;
 265         unsigned long mem_blocks = 0;
 266
 267         if (cpu_has_feature(CPU_FTR_SLB))
 268                 mem_blocks = iSeries_process_Regatta_mainstore_vpd(mb_array,
 269                                 max_entries);
 270         else
 271                 mem_blocks = iSeries_process_Condor_mainstore_vpd(mb_array,
 272                                 max_entries);
 273
 274         printk("Mainstore_VPD: numMemoryBlocks = %ld \n", mem_blocks);
 275         for (i = 0; i < mem_blocks; ++i) {
 276                 printk("Mainstore_VPD: block %3ld logical chunks %016lx - %016lx\n"
 277                        "                             abs chunks %016lx - %016lx\n",
 278                         i, mb_array[i].logicalStart, mb_array[i].logicalEnd,
 279                         mb_array[i].absStart, mb_array[i].absEnd);
 280         }
 281         return mem_blocks;
 282 }
 283
 284 static void __init iSeries_get_cmdline(void)
 285 {
 286         char *p, *q;
 287
 288         /* copy the command line parameter from the primary VSP  */
 289         HvCallEvent_dmaToSp(cmd_line, 2 * 64* 1024, 256,
 290                         HvLpDma_Direction_RemoteToLocal);
 291
 292         p = cmd_line;
 293         q = cmd_line + 255;
 294         while(p < q) {
 295                 if (!*p || *p == '\n')
 296                         break;
 297                 ++p;
 298         }
 299         *p = 0;
 300 }
 301
 302 static void __init iSeries_init_early(void)
 303 {
 304         DBG(" -> iSeries_init_early()\n");
 305
 306         ppc64_firmware_features = FW_FEATURE_ISERIES;
 307
 308         ppc64_interrupt_controller = IC_ISERIES;
 309
 310 #if defined(CONFIG_BLK_DEV_INITRD)
 311         /*
 312          * If the init RAM disk has been configured and there is
 313          * a non-zero starting address for it, set it up
 314          */
 315         if (naca.xRamDisk) {
 316                 initrd_start = (unsigned long)__va(naca.xRamDisk);
 317                 initrd_end = initrd_start + naca.xRamDiskSize * HW_PAGE_SIZE;
 318                 initrd_below_start_ok = 1;      // ramdisk in kernel space
 319                 ROOT_DEV = Root_RAM0;
 320                 if (((rd_size * 1024) / HW_PAGE_SIZE) < naca.xRamDiskSize)
 321                         rd_size = (naca.xRamDiskSize * HW_PAGE_SIZE) / 1024;
 322         } else
 323 #endif /* CONFIG_BLK_DEV_INITRD */
 324         {
 325             /* ROOT_DEV = MKDEV(VIODASD_MAJOR, 1); */
 326         }
 327
 328         iSeries_recal_tb = get_tb();
 329         iSeries_recal_titan = HvCallXm_loadTod();
 330
 331         /*
 332          * Initialize the hash table management pointers
 333          */
 334         hpte_init_iSeries();
 335
 336         /*
 337          * Initialize the DMA/TCE management
 338          */
 339         iommu_init_early_iSeries();
 340
 341         /* Initialize machine-dependency vectors */
 342 #ifdef CONFIG_SMP
 343         smp_init_iSeries();
 344 #endif
 345         if (itLpNaca.xPirEnvironMode == 0)
 346                 piranha_simulator = 1;
 347
 348         /* Associate Lp Event Queue 0 with processor 0 */
 349         HvCallEvent_setLpEventQueueInterruptProc(0, 0);
 350
 351         mf_init();
 352         mf_initialized = 1;
 353         mb();
 354
 355         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 356          * look sensible. If not, clear initrd reference.
 357          */
 358 #ifdef CONFIG_BLK_DEV_INITRD
 359         if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
 360             initrd_end > initrd_start)
 361                 ROOT_DEV = Root_RAM0;
 362         else
 363                 initrd_start = initrd_end = 0;
 364 #endif /* CONFIG_BLK_DEV_INITRD */
 365
 366         DBG(" <- iSeries_init_early()\n");
 367 }
 368
 369 struct mschunks_map mschunks_map = {
 370         /* XXX We don't use these, but Piranha might need them. */
 371         .chunk_size  = MSCHUNKS_CHUNK_SIZE,
 372         .chunk_shift = MSCHUNKS_CHUNK_SHIFT,
 373         .chunk_mask  = MSCHUNKS_OFFSET_MASK,
 374 };
 375 EXPORT_SYMBOL(mschunks_map);
 376
 377 void mschunks_alloc(unsigned long num_chunks)
 378 {
 379         klimit = _ALIGN(klimit, sizeof(u32));
 380         mschunks_map.mapping = (u32 *)klimit;
 381         klimit += num_chunks * sizeof(u32);
 382         mschunks_map.num_chunks = num_chunks;
 383 }
 384
 385 /*
 386  * The iSeries may have very large memories ( > 128 GB ) and a partition
 387  * may get memory in "chunks" that may be anywhere in the 2**52 real
 388  * address space.  The chunks are 256K in size.  To map this to the
 389  * memory model Linux expects, the AS/400 specific code builds a
 390  * translation table to translate what Linux thinks are "physical"
 391  * addresses to the actual real addresses.  This allows us to make
 392  * it appear to Linux that we have contiguous memory starting at
 393  * physical address zero while in fact this could be far from the truth.
 394  * To avoid confusion, I'll let the words physical and/or real address
 395  * apply to the Linux addresses while I'll use "absolute address" to
 396  * refer to the actual hardware real address.
 397  *
 398  * build_iSeries_Memory_Map gets information from the Hypervisor and
 399  * looks at the Main Store VPD to determine the absolute addresses
 400  * of the memory that has been assigned to our partition and builds
 401  * a table used to translate Linux's physical addresses to these
 402  * absolute addresses.  Absolute addresses are needed when
 403  * communicating with the hypervisor (e.g. to build HPT entries)
 404  *
 405  * Returns the physical memory size
 406  */
 407
 408 static unsigned long __init build_iSeries_Memory_Map(void)
 409 {
 410         u32 loadAreaFirstChunk, loadAreaLastChunk, loadAreaSize;
 411         u32 nextPhysChunk;
 412         u32 hptFirstChunk, hptLastChunk, hptSizeChunks, hptSizePages;
 413         u32 totalChunks,moreChunks;
 414         u32 currChunk, thisChunk, absChunk;
 415         u32 currDword;
 416         u32 chunkBit;
 417         u64 map;
 418         struct MemoryBlock mb[32];
 419         unsigned long numMemoryBlocks, curBlock;
 420
 421         /* Chunk size on iSeries is 256K bytes */
 422         totalChunks = (u32)HvLpConfig_getMsChunks();
 423         mschunks_alloc(totalChunks);
 424
 425         /*
 426          * Get absolute address of our load area
 427          * and map it to physical address 0
 428          * This guarantees that the loadarea ends up at physical 0
 429          * otherwise, it might not be returned by PLIC as the first
 430          * chunks
 431          */
 432
 433         loadAreaFirstChunk = (u32)addr_to_chunk(itLpNaca.xLoadAreaAddr);
 434         loadAreaSize =  itLpNaca.xLoadAreaChunks;
 435
 436         /*
 437          * Only add the pages already mapped here.
 438          * Otherwise we might add the hpt pages
 439          * The rest of the pages of the load area
 440          * aren't in the HPT yet and can still
 441          * be assigned an arbitrary physical address
 442          */
 443         if ((loadAreaSize * 64) > HvPagesToMap)
 444                 loadAreaSize = HvPagesToMap / 64;
 445
 446         loadAreaLastChunk = loadAreaFirstChunk + loadAreaSize - 1;
 447
 448         /*
 449          * TODO Do we need to do something if the HPT is in the 64MB load area?
 450          * This would be required if the itLpNaca.xLoadAreaChunks includes
 451          * the HPT size
 452          */
 453
 454         printk("Mapping load area - physical addr = 0000000000000000\n"
 455                 "                    absolute addr = %016lx\n",
 456                 chunk_to_addr(loadAreaFirstChunk));
 457         printk("Load area size %dK\n", loadAreaSize * 256);
 458
 459         for (nextPhysChunk = 0; nextPhysChunk < loadAreaSize; ++nextPhysChunk)
 460                 mschunks_map.mapping[nextPhysChunk] =
 461                         loadAreaFirstChunk + nextPhysChunk;
 462
 463         /*
 464          * Get absolute address of our HPT and remember it so
 465          * we won't map it to any physical address
 466          */
 467         hptFirstChunk = (u32)addr_to_chunk(HvCallHpt_getHptAddress());
 468         hptSizePages = (u32)HvCallHpt_getHptPages();
 469         hptSizeChunks = hptSizePages >>
 470                 (MSCHUNKS_CHUNK_SHIFT - HW_PAGE_SHIFT);
 471         hptLastChunk = hptFirstChunk + hptSizeChunks - 1;
 472
 473         printk("HPT absolute addr = %016lx, size = %dK\n",
 474                         chunk_to_addr(hptFirstChunk), hptSizeChunks * 256);
 475
 476         ppc64_pft_size = __ilog2(hptSizePages * HW_PAGE_SIZE);
 477
 478         /*
 479          * The actual hashed page table is in the hypervisor,
 480          * we have no direct access
 481          */
 482         htab_address = NULL;
 483
 484         /*
 485          * Determine if absolute memory has any
 486          * holes so that we can interpret the
 487          * access map we get back from the hypervisor
 488          * correctly.
 489          */
 490         numMemoryBlocks = iSeries_process_mainstore_vpd(mb, 32);
 491
 492         /*
 493          * Process the main store access map from the hypervisor
 494          * to build up our physical -> absolute translation table
 495          */
 496         curBlock = 0;
 497         currChunk = 0;
 498         currDword = 0;
 499         moreChunks = totalChunks;
 500
 501         while (moreChunks) {
 502                 map = HvCallSm_get64BitsOfAccessMap(itLpNaca.xLpIndex,
 503                                 currDword);
 504                 thisChunk = currChunk;
 505                 while (map) {
 506                         chunkBit = map >> 63;
 507                         map <<= 1;
 508                         if (chunkBit) {
 509                                 --moreChunks;
 510                                 while (thisChunk >= mb[curBlock].logicalEnd) {
 511                                         ++curBlock;
 512                                         if (curBlock >= numMemoryBlocks)
 513                                                 panic("out of memory blocks");
 514                                 }
 515                                 if (thisChunk < mb[curBlock].logicalStart)
 516                                         panic("memory block error");
 517
 518                                 absChunk = mb[curBlock].absStart +
 519                                         (thisChunk - mb[curBlock].logicalStart);
 520                                 if (((absChunk < hptFirstChunk) ||
 521                                      (absChunk > hptLastChunk)) &&
 522                                     ((absChunk < loadAreaFirstChunk) ||
 523                                      (absChunk > loadAreaLastChunk))) {
 524                                         mschunks_map.mapping[nextPhysChunk] =
 525                                                 absChunk;
 526                                         ++nextPhysChunk;
 527                                 }
 528                         }
 529                         ++thisChunk;
 530                 }
 531                 ++currDword;
 532                 currChunk += 64;
 533         }
 534
 535         /*
 536          * main store size (in chunks) is
 537          *   totalChunks - hptSizeChunks
 538          * which should be equal to
 539          *   nextPhysChunk
 540          */
 541         return chunk_to_addr(nextPhysChunk);
 542 }
 543
 544 /*
 545  * Document me.
 546  */
 547 static void __init iSeries_setup_arch(void)
 548 {
 549         if (get_paca()->lppaca.shared_proc) {
 550                 ppc_md.idle_loop = iseries_shared_idle;
 551                 printk(KERN_INFO "Using shared processor idle loop\n");
 552         } else {
 553                 ppc_md.idle_loop = iseries_dedicated_idle;
 554                 printk(KERN_INFO "Using dedicated idle loop\n");
 555         }
 556
 557         /* Setup the Lp Event Queue */
 558         setup_hvlpevent_queue();
 559
 560         printk("Max  logical processors = %d\n",
 561                         itVpdAreas.xSlicMaxLogicalProcs);
 562         printk("Max physical processors = %d\n",
 563                         itVpdAreas.xSlicMaxPhysicalProcs);
 564 }
 565
 566 static void iSeries_show_cpuinfo(struct seq_file *m)
 567 {
 568         seq_printf(m, "machine\t\t: 64-bit iSeries Logical Partition\n");
 569 }
 570
 571 /*
 572  * Document me.
 573  */
 574 static void iSeries_restart(char *cmd)
 575 {
 576         mf_reboot();
 577 }
 578
 579 /*
 580  * Document me.
 581  */
 582 static void iSeries_power_off(void)
 583 {
 584         mf_power_off();
 585 }
 586
 587 /*
 588  * Document me.
 589  */
 590 static void iSeries_halt(void)
 591 {
 592         mf_power_off();
 593 }
 594
 595 static void __init iSeries_progress(char * st, unsigned short code)
 596 {
 597         printk("Progress: [%04x] - %s\n", (unsigned)code, st);
 598         if (!piranha_simulator && mf_initialized) {
 599                 if (code != 0xffff)
 600                         mf_display_progress(code);
 601                 else
 602                         mf_clear_src();
 603         }
 604 }
 605
 606 static void __init iSeries_fixup_klimit(void)
 607 {
 608         /*
 609          * Change klimit to take into account any ram disk
 610          * that may be included
 611          */
 612         if (naca.xRamDisk)
 613                 klimit = KERNELBASE + (u64)naca.xRamDisk +
 614                         (naca.xRamDiskSize * HW_PAGE_SIZE);
 615         else {
 616                 /*
 617                  * No ram disk was included - check and see if there
 618                  * was an embedded system map.  Change klimit to take
 619                  * into account any embedded system map
 620                  */
 621                 if (embedded_sysmap_end)
 622                         klimit = KERNELBASE + ((embedded_sysmap_end + 4095) &
 623                                         0xfffffffffffff000);
 624         }
 625 }
 626
 627 static int __init iSeries_src_init(void)
 628 {
 629         /* clear the progress line */
 630         ppc_md.progress(" ", 0xffff);
 631         return 0;
 632 }
 633
 634 late_initcall(iSeries_src_init);
 635
 636 static inline void process_iSeries_events(void)
 637 {
 638         asm volatile ("li 0,0x5555; sc" : : : "r0", "r3");
 639 }
 640
 641 static void yield_shared_processor(void)
 642 {
 643         unsigned long tb;
 644
 645         HvCall_setEnabledInterrupts(HvCall_MaskIPI |
 646                                     HvCall_MaskLpEvent |
 647                                     HvCall_MaskLpProd |
 648                                     HvCall_MaskTimeout);
 649
 650         tb = get_tb();
 651         /* Compute future tb value when yield should expire */
 652         HvCall_yieldProcessor(HvCall_YieldTimed, tb+tb_ticks_per_jiffy);
 653
 654         /*
 655          * The decrementer stops during the yield.  Force a fake decrementer
 656          * here and let the timer_interrupt code sort out the actual time.
 657          */
 658         get_paca()->lppaca.int_dword.fields.decr_int = 1;
 659         process_iSeries_events();
 660 }
 661
 662 static void iseries_shared_idle(void)
 663 {
 664         while (1) {
 665                 while (!need_resched() && !hvlpevent_is_pending()) {
 666                         local_irq_disable();
 667                         ppc64_runlatch_off();
 668
 669                         /* Recheck with irqs off */
 670                         if (!need_resched() && !hvlpevent_is_pending())
 671                                 yield_shared_processor();
 672
 673                         HMT_medium();
 674                         local_irq_enable();
 675                 }
 676
 677                 ppc64_runlatch_on();
 678
 679                 if (hvlpevent_is_pending())
 680                         process_iSeries_events();
 681
 682                 preempt_enable_no_resched();
 683                 schedule();
 684                 preempt_disable();
 685         }
 686 }
 687
 688 static void iseries_dedicated_idle(void)
 689 {
 690         set_thread_flag(TIF_POLLING_NRFLAG);
 691
 692         while (1) {
 693                 if (!need_resched()) {
 694                         while (!need_resched()) {
 695                                 ppc64_runlatch_off();
 696                                 HMT_low();
 697
 698                                 if (hvlpevent_is_pending()) {
 699                                         HMT_medium();
 700                                         ppc64_runlatch_on();
 701                                         process_iSeries_events();
 702                                 }
 703                         }
 704
 705                         HMT_medium();
 706                 }
 707
 708                 ppc64_runlatch_on();
 709                 preempt_enable_no_resched();
 710                 schedule();
 711                 preempt_disable();
 712         }
 713 }
 714
 715 #ifndef CONFIG_PCI
 716 void __init iSeries_init_IRQ(void) { }
 717 #endif
 718
 719 static int __init iseries_probe(int platform)
 720 {
 721         return PLATFORM_ISERIES_LPAR == platform;
 722 }
 723
 724 struct machdep_calls __initdata iseries_md = {
 725         .setup_arch     = iSeries_setup_arch,
 726         .show_cpuinfo   = iSeries_show_cpuinfo,
 727         .init_IRQ       = iSeries_init_IRQ,
 728         .get_irq        = iSeries_get_irq,
 729         .init_early     = iSeries_init_early,
 730         .pcibios_fixup  = iSeries_pci_final_fixup,
 731         .restart        = iSeries_restart,
 732         .power_off      = iSeries_power_off,
 733         .halt           = iSeries_halt,
 734         .get_boot_time  = iSeries_get_boot_time,
 735         .set_rtc_time   = iSeries_set_rtc_time,
 736         .get_rtc_time   = iSeries_get_rtc_time,
 737         .calibrate_decr = generic_calibrate_decr,
 738         .progress       = iSeries_progress,
 739         .probe          = iseries_probe,
 740         /* XXX Implement enable_pmcs for iSeries */
 741 };
 742
 743 struct blob {
 744         unsigned char data[PAGE_SIZE];
 745         unsigned long next;
 746 };
 747
 748 struct iseries_flat_dt {
 749         struct boot_param_header header;
 750         u64 reserve_map[2];
 751         struct blob dt;
 752         struct blob strings;
 753 };
 754
 755 struct iseries_flat_dt iseries_dt;
 756
 757 void dt_init(struct iseries_flat_dt *dt)
 758 {
 759         dt->header.off_mem_rsvmap =
 760                 offsetof(struct iseries_flat_dt, reserve_map);
 761         dt->header.off_dt_struct = offsetof(struct iseries_flat_dt, dt);
 762         dt->header.off_dt_strings = offsetof(struct iseries_flat_dt, strings);
 763         dt->header.totalsize = sizeof(struct iseries_flat_dt);
 764         dt->header.dt_strings_size = sizeof(struct blob);
 765
 766         /* There is no notion of hardware cpu id on iSeries */
 767         dt->header.boot_cpuid_phys = smp_processor_id();
 768
 769         dt->dt.next = (unsigned long)&dt->dt.data;
 770         dt->strings.next = (unsigned long)&dt->strings.data;
 771
 772         dt->header.magic = OF_DT_HEADER;
 773         dt->header.version = 0x10;
 774         dt->header.last_comp_version = 0x10;
 775
 776         dt->reserve_map[0] = 0;
 777         dt->reserve_map[1] = 0;
 778 }
 779
 780 void dt_check_blob(struct blob *b)
 781 {
 782         if (b->next >= (unsigned long)&b->next) {
 783                 DBG("Ran out of space in flat device tree blob!\n");
 784                 BUG();
 785         }
 786 }
 787
 788 void dt_push_u32(struct iseries_flat_dt *dt, u32 value)
 789 {
 790         *((u32*)dt->dt.next) = value;
 791         dt->dt.next += sizeof(u32);
 792
 793         dt_check_blob(&dt->dt);
 794 }
 795
 796 void dt_push_u64(struct iseries_flat_dt *dt, u64 value)
 797 {
 798         *((u64*)dt->dt.next) = value;
 799         dt->dt.next += sizeof(u64);
 800
 801         dt_check_blob(&dt->dt);
 802 }
 803
 804 unsigned long dt_push_bytes(struct blob *blob, char *data, int len)
 805 {
 806         unsigned long start = blob->next - (unsigned long)blob->data;
 807
 808         memcpy((char *)blob->next, data, len);
 809         blob->next = _ALIGN(blob->next + len, 4);
 810
 811         dt_check_blob(blob);
 812
 813         return start;
 814 }
 815
 816 void dt_start_node(struct iseries_flat_dt *dt, char *name)
 817 {
 818         dt_push_u32(dt, OF_DT_BEGIN_NODE);
 819         dt_push_bytes(&dt->dt, name, strlen(name) + 1);
 820 }
 821
 822 #define dt_end_node(dt) dt_push_u32(dt, OF_DT_END_NODE)
 823
 824 void dt_prop(struct iseries_flat_dt *dt, char *name, char *data, int len)
 825 {
 826         unsigned long offset;
 827
 828         dt_push_u32(dt, OF_DT_PROP);
 829
 830         /* Length of the data */
 831         dt_push_u32(dt, len);
 832
 833         /* Put the property name in the string blob. */
 834         offset = dt_push_bytes(&dt->strings, name, strlen(name) + 1);
 835
 836         /* The offset of the properties name in the string blob. */
 837         dt_push_u32(dt, (u32)offset);
 838
 839         /* The actual data. */
 840         dt_push_bytes(&dt->dt, data, len);
 841 }
 842
 843 void dt_prop_str(struct iseries_flat_dt *dt, char *name, char *data)
 844 {
 845         dt_prop(dt, name, data, strlen(data) + 1); /* + 1 for NULL */
 846 }
 847
 848 void dt_prop_u32(struct iseries_flat_dt *dt, char *name, u32 data)
 849 {
 850         dt_prop(dt, name, (char *)&data, sizeof(u32));
 851 }
 852
 853 void dt_prop_u64(struct iseries_flat_dt *dt, char *name, u64 data)
 854 {
 855         dt_prop(dt, name, (char *)&data, sizeof(u64));
 856 }
 857
 858 void dt_prop_u64_list(struct iseries_flat_dt *dt, char *name, u64 *data, int n)
 859 {
 860         dt_prop(dt, name, (char *)data, sizeof(u64) * n);
 861 }
 862
 863 void dt_prop_empty(struct iseries_flat_dt *dt, char *name)
 864 {
 865         dt_prop(dt, name, NULL, 0);
 866 }
 867
 868 void dt_cpus(struct iseries_flat_dt *dt)
 869 {
 870         unsigned char buf[32];
 871         unsigned char *p;
 872         unsigned int i, index;
 873         struct IoHriProcessorVpd *d;
 874
 875         /* yuck */
 876         snprintf(buf, 32, "PowerPC,%s", cur_cpu_spec->cpu_name);
 877         p = strchr(buf, ' ');
 878         if (!p) p = buf + strlen(buf);
 879
 880         dt_start_node(dt, "cpus");
 881         dt_prop_u32(dt, "#address-cells", 1);
 882         dt_prop_u32(dt, "#size-cells", 0);
 883
 884         for (i = 0; i < NR_CPUS; i++) {
 885                 if (paca[i].lppaca.dyn_proc_status >= 2)
 886                         continue;
 887
 888                 snprintf(p, 32 - (p - buf), "@%d", i);
 889                 dt_start_node(dt, buf);
 890
 891                 dt_prop_str(dt, "device_type", "cpu");
 892
 893                 index = paca[i].lppaca.dyn_hv_phys_proc_index;
 894                 d = &xIoHriProcessorVpd[index];
 895
 896                 dt_prop_u32(dt, "i-cache-size", d->xInstCacheSize * 1024);
 897                 dt_prop_u32(dt, "i-cache-line-size", d->xInstCacheOperandSize);
 898
 899                 dt_prop_u32(dt, "d-cache-size", d->xDataL1CacheSizeKB * 1024);
 900                 dt_prop_u32(dt, "d-cache-line-size", d->xDataCacheOperandSize);
 901
 902                 /* magic conversions to Hz copied from old code */
 903                 dt_prop_u32(dt, "clock-frequency",
 904                         ((1UL << 34) * 1000000) / d->xProcFreq);
 905                 dt_prop_u32(dt, "timebase-frequency",
 906                         ((1UL << 32) * 1000000) / d->xTimeBaseFreq);
 907
 908                 dt_prop_u32(dt, "reg", i);
 909
 910                 dt_end_node(dt);
 911         }
 912
 913         dt_end_node(dt);
 914 }
 915
 916 void build_flat_dt(struct iseries_flat_dt *dt, unsigned long phys_mem_size)
 917 {
 918         u64 tmp[2];
 919
 920         dt_init(dt);
 921
 922         dt_start_node(dt, "");
 923
 924         dt_prop_u32(dt, "#address-cells", 2);
 925         dt_prop_u32(dt, "#size-cells", 2);
 926
 927         /* /memory */
 928         dt_start_node(dt, "memory@0");
 929         dt_prop_str(dt, "name", "memory");
 930         dt_prop_str(dt, "device_type", "memory");
 931         tmp[0] = 0;
 932         tmp[1] = phys_mem_size;
 933         dt_prop_u64_list(dt, "reg", tmp, 2);
 934         dt_end_node(dt);
 935
 936         /* /chosen */
 937         dt_start_node(dt, "chosen");
 938         dt_prop_u32(dt, "linux,platform", PLATFORM_ISERIES_LPAR);
 939         if (cmd_mem_limit)
 940                 dt_prop_u64(dt, "linux,memory-limit", cmd_mem_limit);
 941         dt_end_node(dt);
 942
 943         dt_cpus(dt);
 944
 945         dt_end_node(dt);
 946
 947         dt_push_u32(dt, OF_DT_END);
 948 }
 949
 950 void * __init iSeries_early_setup(void)
 951 {
 952         unsigned long phys_mem_size;
 953
 954         iSeries_fixup_klimit();
 955
 956         /*
 957          * Initialize the table which translate Linux physical addresses to
 958          * AS/400 absolute addresses
 959          */
 960         phys_mem_size = build_iSeries_Memory_Map();
 961
 962         iSeries_get_cmdline();
 963
 964         /* Save unparsed command line copy for /proc/cmdline */
 965         strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);
 966
 967         /* Parse early parameters, in particular mem=x */
 968         parse_early_param();
 969
 970         build_flat_dt(&iseries_dt, phys_mem_size);
 971
 972         return (void *) __pa(&iseries_dt);
 973 }
 974
 975 /*
 976  * On iSeries we just parse the mem=X option from the command line.
 977  * On pSeries it's a bit more complicated, see prom_init_mem()
 978  */
 979 static int __init early_parsemem(char *p)
 980 {
 981         if (p)
 982                 cmd_mem_limit = ALIGN(memparse(p, &p), PAGE_SIZE);
 983         return 0;
 984 }
 985 early_param("mem", early_parsemem);
 986
 987 static void hvputc(char c)
 988 {
 989         if (c == '\n')
 990                 hvputc('\r');
 991
 992         HvCall_writeLogBuffer(&c, 1);
 993 }
 994
 995 void __init udbg_init_iseries(void)
 996 {
 997         udbg_putc = hvputc;
 998 }