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 #include <asm/irq.h>
  57
  58 #include "naca.h"
  59 #include "setup.h"
  60 #include "irq.h"
  61 #include "vpd_areas.h"
  62 #include "processor_vpd.h"
  63 #include "main_store.h"
  64 #include "call_sm.h"
  65 #include "call_hpt.h"
  66
  67 #ifdef DEBUG
  68 #define DBG(fmt...) udbg_printf(fmt)
  69 #else
  70 #define DBG(fmt...)
  71 #endif
  72
  73 /* Function Prototypes */
  74 static unsigned long build_iSeries_Memory_Map(void);
  75 static void iseries_shared_idle(void);
  76 static void iseries_dedicated_idle(void);
  77 #ifdef CONFIG_PCI
  78 extern void iSeries_pci_final_fixup(void);
  79 #else
  80 static void iSeries_pci_final_fixup(void) { }
  81 #endif
  82
  83 extern int rd_size;             /* Defined in drivers/block/rd.c */
  84 extern unsigned long embedded_sysmap_start;
  85 extern unsigned long embedded_sysmap_end;
  86
  87 extern unsigned long iSeries_recal_tb;
  88 extern unsigned long iSeries_recal_titan;
  89
  90 struct MemoryBlock {
  91         unsigned long absStart;
  92         unsigned long absEnd;
  93         unsigned long logicalStart;
  94         unsigned long logicalEnd;
  95 };
  96
  97 /*
  98  * Process the main store vpd to determine where the holes in memory are
  99  * and return the number of physical blocks and fill in the array of
 100  * block data.
 101  */
 102 static unsigned long iSeries_process_Condor_mainstore_vpd(
 103                 struct MemoryBlock *mb_array, unsigned long max_entries)
 104 {
 105         unsigned long holeFirstChunk, holeSizeChunks;
 106         unsigned long numMemoryBlocks = 1;
 107         struct IoHriMainStoreSegment4 *msVpd =
 108                 (struct IoHriMainStoreSegment4 *)xMsVpd;
 109         unsigned long holeStart = msVpd->nonInterleavedBlocksStartAdr;
 110         unsigned long holeEnd = msVpd->nonInterleavedBlocksEndAdr;
 111         unsigned long holeSize = holeEnd - holeStart;
 112
 113         printk("Mainstore_VPD: Condor\n");
 114         /*
 115          * Determine if absolute memory has any
 116          * holes so that we can interpret the
 117          * access map we get back from the hypervisor
 118          * correctly.
 119          */
 120         mb_array[0].logicalStart = 0;
 121         mb_array[0].logicalEnd = 0x100000000;
 122         mb_array[0].absStart = 0;
 123         mb_array[0].absEnd = 0x100000000;
 124
 125         if (holeSize) {
 126                 numMemoryBlocks = 2;
 127                 holeStart = holeStart & 0x000fffffffffffff;
 128                 holeStart = addr_to_chunk(holeStart);
 129                 holeFirstChunk = holeStart;
 130                 holeSize = addr_to_chunk(holeSize);
 131                 holeSizeChunks = holeSize;
 132                 printk( "Main store hole: start chunk = %0lx, size = %0lx chunks\n",
 133                                 holeFirstChunk, holeSizeChunks );
 134                 mb_array[0].logicalEnd = holeFirstChunk;
 135                 mb_array[0].absEnd = holeFirstChunk;
 136                 mb_array[1].logicalStart = holeFirstChunk;
 137                 mb_array[1].logicalEnd = 0x100000000 - holeSizeChunks;
 138                 mb_array[1].absStart = holeFirstChunk + holeSizeChunks;
 139                 mb_array[1].absEnd = 0x100000000;
 140         }
 141         return numMemoryBlocks;
 142 }
 143
 144 #define MaxSegmentAreas                 32
 145 #define MaxSegmentAdrRangeBlocks        128
 146 #define MaxAreaRangeBlocks              4
 147
 148 static unsigned long iSeries_process_Regatta_mainstore_vpd(
 149                 struct MemoryBlock *mb_array, unsigned long max_entries)
 150 {
 151         struct IoHriMainStoreSegment5 *msVpdP =
 152                 (struct IoHriMainStoreSegment5 *)xMsVpd;
 153         unsigned long numSegmentBlocks = 0;
 154         u32 existsBits = msVpdP->msAreaExists;
 155         unsigned long area_num;
 156
 157         printk("Mainstore_VPD: Regatta\n");
 158
 159         for (area_num = 0; area_num < MaxSegmentAreas; ++area_num ) {
 160                 unsigned long numAreaBlocks;
 161                 struct IoHriMainStoreArea4 *currentArea;
 162
 163                 if (existsBits & 0x80000000) {
 164                         unsigned long block_num;
 165
 166                         currentArea = &msVpdP->msAreaArray[area_num];
 167                         numAreaBlocks = currentArea->numAdrRangeBlocks;
 168                         printk("ms_vpd: processing area %2ld  blocks=%ld",
 169                                         area_num, numAreaBlocks);
 170                         for (block_num = 0; block_num < numAreaBlocks;
 171                                         ++block_num ) {
 172                                 /* Process an address range block */
 173                                 struct MemoryBlock tempBlock;
 174                                 unsigned long i;
 175
 176                                 tempBlock.absStart =
 177                                         (unsigned long)currentArea->xAdrRangeBlock[block_num].blockStart;
 178                                 tempBlock.absEnd =
 179                                         (unsigned long)currentArea->xAdrRangeBlock[block_num].blockEnd;
 180                                 tempBlock.logicalStart = 0;
 181                                 tempBlock.logicalEnd   = 0;
 182                                 printk("\n          block %ld absStart=%016lx absEnd=%016lx",
 183                                                 block_num, tempBlock.absStart,
 184                                                 tempBlock.absEnd);
 185
 186                                 for (i = 0; i < numSegmentBlocks; ++i) {
 187                                         if (mb_array[i].absStart ==
 188                                                         tempBlock.absStart)
 189                                                 break;
 190                                 }
 191                                 if (i == numSegmentBlocks) {
 192                                         if (numSegmentBlocks == max_entries)
 193                                                 panic("iSeries_process_mainstore_vpd: too many memory blocks");
 194                                         mb_array[numSegmentBlocks] = tempBlock;
 195                                         ++numSegmentBlocks;
 196                                 } else
 197                                         printk(" (duplicate)");
 198                         }
 199                         printk("\n");
 200                 }
 201                 existsBits <<= 1;
 202         }
 203         /* Now sort the blocks found into ascending sequence */
 204         if (numSegmentBlocks > 1) {
 205                 unsigned long m, n;
 206
 207                 for (m = 0; m < numSegmentBlocks - 1; ++m) {
 208                         for (n = numSegmentBlocks - 1; m < n; --n) {
 209                                 if (mb_array[n].absStart <
 210                                                 mb_array[n-1].absStart) {
 211                                         struct MemoryBlock tempBlock;
 212
 213                                         tempBlock = mb_array[n];
 214                                         mb_array[n] = mb_array[n-1];
 215                                         mb_array[n-1] = tempBlock;
 216                                 }
 217                         }
 218                 }
 219         }
 220         /*
 221          * Assign "logical" addresses to each block.  These
 222          * addresses correspond to the hypervisor "bitmap" space.
 223          * Convert all addresses into units of 256K chunks.
 224          */
 225         {
 226         unsigned long i, nextBitmapAddress;
 227
 228         printk("ms_vpd: %ld sorted memory blocks\n", numSegmentBlocks);
 229         nextBitmapAddress = 0;
 230         for (i = 0; i < numSegmentBlocks; ++i) {
 231                 unsigned long length = mb_array[i].absEnd -
 232                         mb_array[i].absStart;
 233
 234                 mb_array[i].logicalStart = nextBitmapAddress;
 235                 mb_array[i].logicalEnd = nextBitmapAddress + length;
 236                 nextBitmapAddress += length;
 237                 printk("          Bitmap range: %016lx - %016lx\n"
 238                                 "        Absolute range: %016lx - %016lx\n",
 239                                 mb_array[i].logicalStart,
 240                                 mb_array[i].logicalEnd,
 241                                 mb_array[i].absStart, mb_array[i].absEnd);
 242                 mb_array[i].absStart = addr_to_chunk(mb_array[i].absStart &
 243                                 0x000fffffffffffff);
 244                 mb_array[i].absEnd = addr_to_chunk(mb_array[i].absEnd &
 245                                 0x000fffffffffffff);
 246                 mb_array[i].logicalStart =
 247                         addr_to_chunk(mb_array[i].logicalStart);
 248                 mb_array[i].logicalEnd = addr_to_chunk(mb_array[i].logicalEnd);
 249         }
 250         }
 251
 252         return numSegmentBlocks;
 253 }
 254
 255 static unsigned long iSeries_process_mainstore_vpd(struct MemoryBlock *mb_array,
 256                 unsigned long max_entries)
 257 {
 258         unsigned long i;
 259         unsigned long mem_blocks = 0;
 260
 261         if (cpu_has_feature(CPU_FTR_SLB))
 262                 mem_blocks = iSeries_process_Regatta_mainstore_vpd(mb_array,
 263                                 max_entries);
 264         else
 265                 mem_blocks = iSeries_process_Condor_mainstore_vpd(mb_array,
 266                                 max_entries);
 267
 268         printk("Mainstore_VPD: numMemoryBlocks = %ld \n", mem_blocks);
 269         for (i = 0; i < mem_blocks; ++i) {
 270                 printk("Mainstore_VPD: block %3ld logical chunks %016lx - %016lx\n"
 271                        "                             abs chunks %016lx - %016lx\n",
 272                         i, mb_array[i].logicalStart, mb_array[i].logicalEnd,
 273                         mb_array[i].absStart, mb_array[i].absEnd);
 274         }
 275         return mem_blocks;
 276 }
 277
 278 static void __init iSeries_get_cmdline(void)
 279 {
 280         char *p, *q;
 281
 282         /* copy the command line parameter from the primary VSP  */
 283         HvCallEvent_dmaToSp(cmd_line, 2 * 64* 1024, 256,
 284                         HvLpDma_Direction_RemoteToLocal);
 285
 286         p = cmd_line;
 287         q = cmd_line + 255;
 288         while(p < q) {
 289                 if (!*p || *p == '\n')
 290                         break;
 291                 ++p;
 292         }
 293         *p = 0;
 294 }
 295
 296 static void __init iSeries_init_early(void)
 297 {
 298         DBG(" -> iSeries_init_early()\n");
 299
 300         ppc64_interrupt_controller = IC_ISERIES;
 301
 302 #if defined(CONFIG_BLK_DEV_INITRD)
 303         /*
 304          * If the init RAM disk has been configured and there is
 305          * a non-zero starting address for it, set it up
 306          */
 307         if (naca.xRamDisk) {
 308                 initrd_start = (unsigned long)__va(naca.xRamDisk);
 309                 initrd_end = initrd_start + naca.xRamDiskSize * HW_PAGE_SIZE;
 310                 initrd_below_start_ok = 1;      // ramdisk in kernel space
 311                 ROOT_DEV = Root_RAM0;
 312                 if (((rd_size * 1024) / HW_PAGE_SIZE) < naca.xRamDiskSize)
 313                         rd_size = (naca.xRamDiskSize * HW_PAGE_SIZE) / 1024;
 314         } else
 315 #endif /* CONFIG_BLK_DEV_INITRD */
 316         {
 317             /* ROOT_DEV = MKDEV(VIODASD_MAJOR, 1); */
 318         }
 319
 320         iSeries_recal_tb = get_tb();
 321         iSeries_recal_titan = HvCallXm_loadTod();
 322
 323         /*
 324          * Initialize the hash table management pointers
 325          */
 326         hpte_init_iSeries();
 327
 328         /*
 329          * Initialize the DMA/TCE management
 330          */
 331         iommu_init_early_iSeries();
 332
 333         /* Initialize machine-dependency vectors */
 334 #ifdef CONFIG_SMP
 335         smp_init_iSeries();
 336 #endif
 337
 338         /* Associate Lp Event Queue 0 with processor 0 */
 339         HvCallEvent_setLpEventQueueInterruptProc(0, 0);
 340
 341         mf_init();
 342
 343         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 344          * look sensible. If not, clear initrd reference.
 345          */
 346 #ifdef CONFIG_BLK_DEV_INITRD
 347         if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
 348             initrd_end > initrd_start)
 349                 ROOT_DEV = Root_RAM0;
 350         else
 351                 initrd_start = initrd_end = 0;
 352 #endif /* CONFIG_BLK_DEV_INITRD */
 353
 354         DBG(" <- iSeries_init_early()\n");
 355 }
 356
 357 struct mschunks_map mschunks_map = {
 358         /* XXX We don't use these, but Piranha might need them. */
 359         .chunk_size  = MSCHUNKS_CHUNK_SIZE,
 360         .chunk_shift = MSCHUNKS_CHUNK_SHIFT,
 361         .chunk_mask  = MSCHUNKS_OFFSET_MASK,
 362 };
 363 EXPORT_SYMBOL(mschunks_map);
 364
 365 void mschunks_alloc(unsigned long num_chunks)
 366 {
 367         klimit = _ALIGN(klimit, sizeof(u32));
 368         mschunks_map.mapping = (u32 *)klimit;
 369         klimit += num_chunks * sizeof(u32);
 370         mschunks_map.num_chunks = num_chunks;
 371 }
 372
 373 /*
 374  * The iSeries may have very large memories ( > 128 GB ) and a partition
 375  * may get memory in "chunks" that may be anywhere in the 2**52 real
 376  * address space.  The chunks are 256K in size.  To map this to the
 377  * memory model Linux expects, the AS/400 specific code builds a
 378  * translation table to translate what Linux thinks are "physical"
 379  * addresses to the actual real addresses.  This allows us to make
 380  * it appear to Linux that we have contiguous memory starting at
 381  * physical address zero while in fact this could be far from the truth.
 382  * To avoid confusion, I'll let the words physical and/or real address
 383  * apply to the Linux addresses while I'll use "absolute address" to
 384  * refer to the actual hardware real address.
 385  *
 386  * build_iSeries_Memory_Map gets information from the Hypervisor and
 387  * looks at the Main Store VPD to determine the absolute addresses
 388  * of the memory that has been assigned to our partition and builds
 389  * a table used to translate Linux's physical addresses to these
 390  * absolute addresses.  Absolute addresses are needed when
 391  * communicating with the hypervisor (e.g. to build HPT entries)
 392  *
 393  * Returns the physical memory size
 394  */
 395
 396 static unsigned long __init build_iSeries_Memory_Map(void)
 397 {
 398         u32 loadAreaFirstChunk, loadAreaLastChunk, loadAreaSize;
 399         u32 nextPhysChunk;
 400         u32 hptFirstChunk, hptLastChunk, hptSizeChunks, hptSizePages;
 401         u32 totalChunks,moreChunks;
 402         u32 currChunk, thisChunk, absChunk;
 403         u32 currDword;
 404         u32 chunkBit;
 405         u64 map;
 406         struct MemoryBlock mb[32];
 407         unsigned long numMemoryBlocks, curBlock;
 408
 409         /* Chunk size on iSeries is 256K bytes */
 410         totalChunks = (u32)HvLpConfig_getMsChunks();
 411         mschunks_alloc(totalChunks);
 412
 413         /*
 414          * Get absolute address of our load area
 415          * and map it to physical address 0
 416          * This guarantees that the loadarea ends up at physical 0
 417          * otherwise, it might not be returned by PLIC as the first
 418          * chunks
 419          */
 420
 421         loadAreaFirstChunk = (u32)addr_to_chunk(itLpNaca.xLoadAreaAddr);
 422         loadAreaSize =  itLpNaca.xLoadAreaChunks;
 423
 424         /*
 425          * Only add the pages already mapped here.
 426          * Otherwise we might add the hpt pages
 427          * The rest of the pages of the load area
 428          * aren't in the HPT yet and can still
 429          * be assigned an arbitrary physical address
 430          */
 431         if ((loadAreaSize * 64) > HvPagesToMap)
 432                 loadAreaSize = HvPagesToMap / 64;
 433
 434         loadAreaLastChunk = loadAreaFirstChunk + loadAreaSize - 1;
 435
 436         /*
 437          * TODO Do we need to do something if the HPT is in the 64MB load area?
 438          * This would be required if the itLpNaca.xLoadAreaChunks includes
 439          * the HPT size
 440          */
 441
 442         printk("Mapping load area - physical addr = 0000000000000000\n"
 443                 "                    absolute addr = %016lx\n",
 444                 chunk_to_addr(loadAreaFirstChunk));
 445         printk("Load area size %dK\n", loadAreaSize * 256);
 446
 447         for (nextPhysChunk = 0; nextPhysChunk < loadAreaSize; ++nextPhysChunk)
 448                 mschunks_map.mapping[nextPhysChunk] =
 449                         loadAreaFirstChunk + nextPhysChunk;
 450
 451         /*
 452          * Get absolute address of our HPT and remember it so
 453          * we won't map it to any physical address
 454          */
 455         hptFirstChunk = (u32)addr_to_chunk(HvCallHpt_getHptAddress());
 456         hptSizePages = (u32)HvCallHpt_getHptPages();
 457         hptSizeChunks = hptSizePages >>
 458                 (MSCHUNKS_CHUNK_SHIFT - HW_PAGE_SHIFT);
 459         hptLastChunk = hptFirstChunk + hptSizeChunks - 1;
 460
 461         printk("HPT absolute addr = %016lx, size = %dK\n",
 462                         chunk_to_addr(hptFirstChunk), hptSizeChunks * 256);
 463
 464         /*
 465          * Determine if absolute memory has any
 466          * holes so that we can interpret the
 467          * access map we get back from the hypervisor
 468          * correctly.
 469          */
 470         numMemoryBlocks = iSeries_process_mainstore_vpd(mb, 32);
 471
 472         /*
 473          * Process the main store access map from the hypervisor
 474          * to build up our physical -> absolute translation table
 475          */
 476         curBlock = 0;
 477         currChunk = 0;
 478         currDword = 0;
 479         moreChunks = totalChunks;
 480
 481         while (moreChunks) {
 482                 map = HvCallSm_get64BitsOfAccessMap(itLpNaca.xLpIndex,
 483                                 currDword);
 484                 thisChunk = currChunk;
 485                 while (map) {
 486                         chunkBit = map >> 63;
 487                         map <<= 1;
 488                         if (chunkBit) {
 489                                 --moreChunks;
 490                                 while (thisChunk >= mb[curBlock].logicalEnd) {
 491                                         ++curBlock;
 492                                         if (curBlock >= numMemoryBlocks)
 493                                                 panic("out of memory blocks");
 494                                 }
 495                                 if (thisChunk < mb[curBlock].logicalStart)
 496                                         panic("memory block error");
 497
 498                                 absChunk = mb[curBlock].absStart +
 499                                         (thisChunk - mb[curBlock].logicalStart);
 500                                 if (((absChunk < hptFirstChunk) ||
 501                                      (absChunk > hptLastChunk)) &&
 502                                     ((absChunk < loadAreaFirstChunk) ||
 503                                      (absChunk > loadAreaLastChunk))) {
 504                                         mschunks_map.mapping[nextPhysChunk] =
 505                                                 absChunk;
 506                                         ++nextPhysChunk;
 507                                 }
 508                         }
 509                         ++thisChunk;
 510                 }
 511                 ++currDword;
 512                 currChunk += 64;
 513         }
 514
 515         /*
 516          * main store size (in chunks) is
 517          *   totalChunks - hptSizeChunks
 518          * which should be equal to
 519          *   nextPhysChunk
 520          */
 521         return chunk_to_addr(nextPhysChunk);
 522 }
 523
 524 /*
 525  * Document me.
 526  */
 527 static void __init iSeries_setup_arch(void)
 528 {
 529         if (get_lppaca()->shared_proc) {
 530                 ppc_md.idle_loop = iseries_shared_idle;
 531                 printk(KERN_DEBUG "Using shared processor idle loop\n");
 532         } else {
 533                 ppc_md.idle_loop = iseries_dedicated_idle;
 534                 printk(KERN_DEBUG "Using dedicated idle loop\n");
 535         }
 536
 537         /* Setup the Lp Event Queue */
 538         setup_hvlpevent_queue();
 539
 540         printk("Max  logical processors = %d\n",
 541                         itVpdAreas.xSlicMaxLogicalProcs);
 542         printk("Max physical processors = %d\n",
 543                         itVpdAreas.xSlicMaxPhysicalProcs);
 544 }
 545
 546 static void iSeries_show_cpuinfo(struct seq_file *m)
 547 {
 548         seq_printf(m, "machine\t\t: 64-bit iSeries Logical Partition\n");
 549 }
 550
 551 static void __init iSeries_progress(char * st, unsigned short code)
 552 {
 553         printk("Progress: [%04x] - %s\n", (unsigned)code, st);
 554         mf_display_progress(code);
 555 }
 556
 557 static void __init iSeries_fixup_klimit(void)
 558 {
 559         /*
 560          * Change klimit to take into account any ram disk
 561          * that may be included
 562          */
 563         if (naca.xRamDisk)
 564                 klimit = KERNELBASE + (u64)naca.xRamDisk +
 565                         (naca.xRamDiskSize * HW_PAGE_SIZE);
 566         else {
 567                 /*
 568                  * No ram disk was included - check and see if there
 569                  * was an embedded system map.  Change klimit to take
 570                  * into account any embedded system map
 571                  */
 572                 if (embedded_sysmap_end)
 573                         klimit = KERNELBASE + ((embedded_sysmap_end + 4095) &
 574                                         0xfffffffffffff000);
 575         }
 576 }
 577
 578 static int __init iSeries_src_init(void)
 579 {
 580         /* clear the progress line */
 581         ppc_md.progress(" ", 0xffff);
 582         return 0;
 583 }
 584
 585 late_initcall(iSeries_src_init);
 586
 587 static inline void process_iSeries_events(void)
 588 {
 589         asm volatile ("li 0,0x5555; sc" : : : "r0", "r3");
 590 }
 591
 592 static void yield_shared_processor(void)
 593 {
 594         unsigned long tb;
 595
 596         HvCall_setEnabledInterrupts(HvCall_MaskIPI |
 597                                     HvCall_MaskLpEvent |
 598                                     HvCall_MaskLpProd |
 599                                     HvCall_MaskTimeout);
 600
 601         tb = get_tb();
 602         /* Compute future tb value when yield should expire */
 603         HvCall_yieldProcessor(HvCall_YieldTimed, tb+tb_ticks_per_jiffy);
 604
 605         /*
 606          * The decrementer stops during the yield.  Force a fake decrementer
 607          * here and let the timer_interrupt code sort out the actual time.
 608          */
 609         get_lppaca()->int_dword.fields.decr_int = 1;
 610         ppc64_runlatch_on();
 611         process_iSeries_events();
 612 }
 613
 614 static void iseries_shared_idle(void)
 615 {
 616         while (1) {
 617                 while (!need_resched() && !hvlpevent_is_pending()) {
 618                         local_irq_disable();
 619                         ppc64_runlatch_off();
 620
 621                         /* Recheck with irqs off */
 622                         if (!need_resched() && !hvlpevent_is_pending())
 623                                 yield_shared_processor();
 624
 625                         HMT_medium();
 626                         local_irq_enable();
 627                 }
 628
 629                 ppc64_runlatch_on();
 630
 631                 if (hvlpevent_is_pending())
 632                         process_iSeries_events();
 633
 634                 preempt_enable_no_resched();
 635                 schedule();
 636                 preempt_disable();
 637         }
 638 }
 639
 640 static void iseries_dedicated_idle(void)
 641 {
 642         set_thread_flag(TIF_POLLING_NRFLAG);
 643
 644         while (1) {
 645                 if (!need_resched()) {
 646                         while (!need_resched()) {
 647                                 ppc64_runlatch_off();
 648                                 HMT_low();
 649
 650                                 if (hvlpevent_is_pending()) {
 651                                         HMT_medium();
 652                                         ppc64_runlatch_on();
 653                                         process_iSeries_events();
 654                                 }
 655                         }
 656
 657                         HMT_medium();
 658                 }
 659
 660                 ppc64_runlatch_on();
 661                 preempt_enable_no_resched();
 662                 schedule();
 663                 preempt_disable();
 664         }
 665 }
 666
 667 #ifndef CONFIG_PCI
 668 void __init iSeries_init_IRQ(void) { }
 669 #endif
 670
 671 static int __init iseries_probe(void)
 672 {
 673         unsigned long root = of_get_flat_dt_root();
 674         if (!of_flat_dt_is_compatible(root, "IBM,iSeries"))
 675                 return 0;
 676
 677         powerpc_firmware_features |= FW_FEATURE_ISERIES;
 678         powerpc_firmware_features |= FW_FEATURE_LPAR;
 679
 680         /*
 681          * The Hypervisor only allows us up to 256 interrupt
 682          * sources (the irq number is passed in a u8).
 683          */
 684         virt_irq_max = 255;
 685
 686         return 1;
 687 }
 688
 689 define_machine(iseries) {
 690         .name           = "iSeries",
 691         .setup_arch     = iSeries_setup_arch,
 692         .show_cpuinfo   = iSeries_show_cpuinfo,
 693         .init_IRQ       = iSeries_init_IRQ,
 694         .get_irq        = iSeries_get_irq,
 695         .init_early     = iSeries_init_early,
 696         .pcibios_fixup  = iSeries_pci_final_fixup,
 697         .restart        = mf_reboot,
 698         .power_off      = mf_power_off,
 699         .halt           = mf_power_off,
 700         .get_boot_time  = iSeries_get_boot_time,
 701         .set_rtc_time   = iSeries_set_rtc_time,
 702         .get_rtc_time   = iSeries_get_rtc_time,
 703         .calibrate_decr = generic_calibrate_decr,
 704         .progress       = iSeries_progress,
 705         .probe          = iseries_probe,
 706         /* XXX Implement enable_pmcs for iSeries */
 707 };
 708
 709 void * __init iSeries_early_setup(void)
 710 {
 711         unsigned long phys_mem_size;
 712
 713         iSeries_fixup_klimit();
 714
 715         /*
 716          * Initialize the table which translate Linux physical addresses to
 717          * AS/400 absolute addresses
 718          */
 719         phys_mem_size = build_iSeries_Memory_Map();
 720
 721         iSeries_get_cmdline();
 722
 723         return (void *) __pa(build_flat_dt(phys_mem_size));
 724 }
 725
 726 static void hvputc(char c)
 727 {
 728         if (c == '\n')
 729                 hvputc('\r');
 730
 731         HvCall_writeLogBuffer(&c, 1);
 732 }
 733
 734 void __init udbg_init_iseries(void)
 735 {
 736         udbg_putc = hvputc;
 737 }