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/init.h>
  20 #include <linux/threads.h>
  21 #include <linux/smp.h>
  22 #include <linux/param.h>
  23 #include <linux/string.h>
  24 #include <linux/initrd.h>
  25 #include <linux/seq_file.h>
  26 #include <linux/kdev_t.h>
  27 #include <linux/major.h>
  28 #include <linux/root_dev.h>
  29 #include <linux/kernel.h>
  30
  31 #include <asm/processor.h>
  32 #include <asm/machdep.h>
  33 #include <asm/page.h>
  34 #include <asm/mmu.h>
  35 #include <asm/pgtable.h>
  36 #include <asm/mmu_context.h>
  37 #include <asm/cputable.h>
  38 #include <asm/sections.h>
  39 #include <asm/iommu.h>
  40 #include <asm/firmware.h>
  41 #include <asm/system.h>
  42 #include <asm/time.h>
  43 #include <asm/paca.h>
  44 #include <asm/cache.h>
  45 #include <asm/sections.h>
  46 #include <asm/abs_addr.h>
  47 #include <asm/iseries/hv_lp_config.h>
  48 #include <asm/iseries/hv_call_event.h>
  49 #include <asm/iseries/hv_call_xm.h>
  50 #include <asm/iseries/it_lp_queue.h>
  51 #include <asm/iseries/mf.h>
  52 #include <asm/iseries/hv_lp_event.h>
  53 #include <asm/iseries/lpar_map.h>
  54 #include <asm/udbg.h>
  55 #include <asm/irq.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 extern int rd_size;             /* Defined in drivers/block/rd.c */
  83
  84 extern unsigned long iSeries_recal_tb;
  85 extern unsigned long iSeries_recal_titan;
  86
  87 struct MemoryBlock {
  88         unsigned long absStart;
  89         unsigned long absEnd;
  90         unsigned long logicalStart;
  91         unsigned long logicalEnd;
  92 };
  93
  94 /*
  95  * Process the main store vpd to determine where the holes in memory are
  96  * and return the number of physical blocks and fill in the array of
  97  * block data.
  98  */
  99 static unsigned long iSeries_process_Condor_mainstore_vpd(
 100                 struct MemoryBlock *mb_array, unsigned long max_entries)
 101 {
 102         unsigned long holeFirstChunk, holeSizeChunks;
 103         unsigned long numMemoryBlocks = 1;
 104         struct IoHriMainStoreSegment4 *msVpd =
 105                 (struct IoHriMainStoreSegment4 *)xMsVpd;
 106         unsigned long holeStart = msVpd->nonInterleavedBlocksStartAdr;
 107         unsigned long holeEnd = msVpd->nonInterleavedBlocksEndAdr;
 108         unsigned long holeSize = holeEnd - holeStart;
 109
 110         printk("Mainstore_VPD: Condor\n");
 111         /*
 112          * Determine if absolute memory has any
 113          * holes so that we can interpret the
 114          * access map we get back from the hypervisor
 115          * correctly.
 116          */
 117         mb_array[0].logicalStart = 0;
 118         mb_array[0].logicalEnd = 0x100000000;
 119         mb_array[0].absStart = 0;
 120         mb_array[0].absEnd = 0x100000000;
 121
 122         if (holeSize) {
 123                 numMemoryBlocks = 2;
 124                 holeStart = holeStart & 0x000fffffffffffff;
 125                 holeStart = addr_to_chunk(holeStart);
 126                 holeFirstChunk = holeStart;
 127                 holeSize = addr_to_chunk(holeSize);
 128                 holeSizeChunks = holeSize;
 129                 printk( "Main store hole: start chunk = %0lx, size = %0lx chunks\n",
 130                                 holeFirstChunk, holeSizeChunks );
 131                 mb_array[0].logicalEnd = holeFirstChunk;
 132                 mb_array[0].absEnd = holeFirstChunk;
 133                 mb_array[1].logicalStart = holeFirstChunk;
 134                 mb_array[1].logicalEnd = 0x100000000 - holeSizeChunks;
 135                 mb_array[1].absStart = holeFirstChunk + holeSizeChunks;
 136                 mb_array[1].absEnd = 0x100000000;
 137         }
 138         return numMemoryBlocks;
 139 }
 140
 141 #define MaxSegmentAreas                 32
 142 #define MaxSegmentAdrRangeBlocks        128
 143 #define MaxAreaRangeBlocks              4
 144
 145 static unsigned long iSeries_process_Regatta_mainstore_vpd(
 146                 struct MemoryBlock *mb_array, unsigned long max_entries)
 147 {
 148         struct IoHriMainStoreSegment5 *msVpdP =
 149                 (struct IoHriMainStoreSegment5 *)xMsVpd;
 150         unsigned long numSegmentBlocks = 0;
 151         u32 existsBits = msVpdP->msAreaExists;
 152         unsigned long area_num;
 153
 154         printk("Mainstore_VPD: Regatta\n");
 155
 156         for (area_num = 0; area_num < MaxSegmentAreas; ++area_num ) {
 157                 unsigned long numAreaBlocks;
 158                 struct IoHriMainStoreArea4 *currentArea;
 159
 160                 if (existsBits & 0x80000000) {
 161                         unsigned long block_num;
 162
 163                         currentArea = &msVpdP->msAreaArray[area_num];
 164                         numAreaBlocks = currentArea->numAdrRangeBlocks;
 165                         printk("ms_vpd: processing area %2ld  blocks=%ld",
 166                                         area_num, numAreaBlocks);
 167                         for (block_num = 0; block_num < numAreaBlocks;
 168                                         ++block_num ) {
 169                                 /* Process an address range block */
 170                                 struct MemoryBlock tempBlock;
 171                                 unsigned long i;
 172
 173                                 tempBlock.absStart =
 174                                         (unsigned long)currentArea->xAdrRangeBlock[block_num].blockStart;
 175                                 tempBlock.absEnd =
 176                                         (unsigned long)currentArea->xAdrRangeBlock[block_num].blockEnd;
 177                                 tempBlock.logicalStart = 0;
 178                                 tempBlock.logicalEnd   = 0;
 179                                 printk("\n          block %ld absStart=%016lx absEnd=%016lx",
 180                                                 block_num, tempBlock.absStart,
 181                                                 tempBlock.absEnd);
 182
 183                                 for (i = 0; i < numSegmentBlocks; ++i) {
 184                                         if (mb_array[i].absStart ==
 185                                                         tempBlock.absStart)
 186                                                 break;
 187                                 }
 188                                 if (i == numSegmentBlocks) {
 189                                         if (numSegmentBlocks == max_entries)
 190                                                 panic("iSeries_process_mainstore_vpd: too many memory blocks");
 191                                         mb_array[numSegmentBlocks] = tempBlock;
 192                                         ++numSegmentBlocks;
 193                                 } else
 194                                         printk(" (duplicate)");
 195                         }
 196                         printk("\n");
 197                 }
 198                 existsBits <<= 1;
 199         }
 200         /* Now sort the blocks found into ascending sequence */
 201         if (numSegmentBlocks > 1) {
 202                 unsigned long m, n;
 203
 204                 for (m = 0; m < numSegmentBlocks - 1; ++m) {
 205                         for (n = numSegmentBlocks - 1; m < n; --n) {
 206                                 if (mb_array[n].absStart <
 207                                                 mb_array[n-1].absStart) {
 208                                         struct MemoryBlock tempBlock;
 209
 210                                         tempBlock = mb_array[n];
 211                                         mb_array[n] = mb_array[n-1];
 212                                         mb_array[n-1] = tempBlock;
 213                                 }
 214                         }
 215                 }
 216         }
 217         /*
 218          * Assign "logical" addresses to each block.  These
 219          * addresses correspond to the hypervisor "bitmap" space.
 220          * Convert all addresses into units of 256K chunks.
 221          */
 222         {
 223         unsigned long i, nextBitmapAddress;
 224
 225         printk("ms_vpd: %ld sorted memory blocks\n", numSegmentBlocks);
 226         nextBitmapAddress = 0;
 227         for (i = 0; i < numSegmentBlocks; ++i) {
 228                 unsigned long length = mb_array[i].absEnd -
 229                         mb_array[i].absStart;
 230
 231                 mb_array[i].logicalStart = nextBitmapAddress;
 232                 mb_array[i].logicalEnd = nextBitmapAddress + length;
 233                 nextBitmapAddress += length;
 234                 printk("          Bitmap range: %016lx - %016lx\n"
 235                                 "        Absolute range: %016lx - %016lx\n",
 236                                 mb_array[i].logicalStart,
 237                                 mb_array[i].logicalEnd,
 238                                 mb_array[i].absStart, mb_array[i].absEnd);
 239                 mb_array[i].absStart = addr_to_chunk(mb_array[i].absStart &
 240                                 0x000fffffffffffff);
 241                 mb_array[i].absEnd = addr_to_chunk(mb_array[i].absEnd &
 242                                 0x000fffffffffffff);
 243                 mb_array[i].logicalStart =
 244                         addr_to_chunk(mb_array[i].logicalStart);
 245                 mb_array[i].logicalEnd = addr_to_chunk(mb_array[i].logicalEnd);
 246         }
 247         }
 248
 249         return numSegmentBlocks;
 250 }
 251
 252 static unsigned long iSeries_process_mainstore_vpd(struct MemoryBlock *mb_array,
 253                 unsigned long max_entries)
 254 {
 255         unsigned long i;
 256         unsigned long mem_blocks = 0;
 257
 258         if (cpu_has_feature(CPU_FTR_SLB))
 259                 mem_blocks = iSeries_process_Regatta_mainstore_vpd(mb_array,
 260                                 max_entries);
 261         else
 262                 mem_blocks = iSeries_process_Condor_mainstore_vpd(mb_array,
 263                                 max_entries);
 264
 265         printk("Mainstore_VPD: numMemoryBlocks = %ld \n", mem_blocks);
 266         for (i = 0; i < mem_blocks; ++i) {
 267                 printk("Mainstore_VPD: block %3ld logical chunks %016lx - %016lx\n"
 268                        "                             abs chunks %016lx - %016lx\n",
 269                         i, mb_array[i].logicalStart, mb_array[i].logicalEnd,
 270                         mb_array[i].absStart, mb_array[i].absEnd);
 271         }
 272         return mem_blocks;
 273 }
 274
 275 static void __init iSeries_get_cmdline(void)
 276 {
 277         char *p, *q;
 278
 279         /* copy the command line parameter from the primary VSP  */
 280         HvCallEvent_dmaToSp(cmd_line, 2 * 64* 1024, 256,
 281                         HvLpDma_Direction_RemoteToLocal);
 282
 283         p = cmd_line;
 284         q = cmd_line + 255;
 285         while(p < q) {
 286                 if (!*p || *p == '\n')
 287                         break;
 288                 ++p;
 289         }
 290         *p = 0;
 291 }
 292
 293 static void __init iSeries_init_early(void)
 294 {
 295         DBG(" -> iSeries_init_early()\n");
 296
 297 #if defined(CONFIG_BLK_DEV_INITRD)
 298         /*
 299          * If the init RAM disk has been configured and there is
 300          * a non-zero starting address for it, set it up
 301          */
 302         if (naca.xRamDisk) {
 303                 initrd_start = (unsigned long)__va(naca.xRamDisk);
 304                 initrd_end = initrd_start + naca.xRamDiskSize * HW_PAGE_SIZE;
 305                 initrd_below_start_ok = 1;      // ramdisk in kernel space
 306                 ROOT_DEV = Root_RAM0;
 307                 if (((rd_size * 1024) / HW_PAGE_SIZE) < naca.xRamDiskSize)
 308                         rd_size = (naca.xRamDiskSize * HW_PAGE_SIZE) / 1024;
 309         } else
 310 #endif /* CONFIG_BLK_DEV_INITRD */
 311         {
 312             /* ROOT_DEV = MKDEV(VIODASD_MAJOR, 1); */
 313         }
 314
 315         iSeries_recal_tb = get_tb();
 316         iSeries_recal_titan = HvCallXm_loadTod();
 317
 318         /*
 319          * Initialize the DMA/TCE management
 320          */
 321         iommu_init_early_iSeries();
 322
 323         /* Initialize machine-dependency vectors */
 324 #ifdef CONFIG_SMP
 325         smp_init_iSeries();
 326 #endif
 327
 328         /* Associate Lp Event Queue 0 with processor 0 */
 329         HvCallEvent_setLpEventQueueInterruptProc(0, 0);
 330
 331         mf_init();
 332
 333         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 334          * look sensible. If not, clear initrd reference.
 335          */
 336 #ifdef CONFIG_BLK_DEV_INITRD
 337         if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
 338             initrd_end > initrd_start)
 339                 ROOT_DEV = Root_RAM0;
 340         else
 341                 initrd_start = initrd_end = 0;
 342 #endif /* CONFIG_BLK_DEV_INITRD */
 343
 344         DBG(" <- iSeries_init_early()\n");
 345 }
 346
 347 struct mschunks_map mschunks_map = {
 348         /* XXX We don't use these, but Piranha might need them. */
 349         .chunk_size  = MSCHUNKS_CHUNK_SIZE,
 350         .chunk_shift = MSCHUNKS_CHUNK_SHIFT,
 351         .chunk_mask  = MSCHUNKS_OFFSET_MASK,
 352 };
 353 EXPORT_SYMBOL(mschunks_map);
 354
 355 void mschunks_alloc(unsigned long num_chunks)
 356 {
 357         klimit = _ALIGN(klimit, sizeof(u32));
 358         mschunks_map.mapping = (u32 *)klimit;
 359         klimit += num_chunks * sizeof(u32);
 360         mschunks_map.num_chunks = num_chunks;
 361 }
 362
 363 /*
 364  * The iSeries may have very large memories ( > 128 GB ) and a partition
 365  * may get memory in "chunks" that may be anywhere in the 2**52 real
 366  * address space.  The chunks are 256K in size.  To map this to the
 367  * memory model Linux expects, the AS/400 specific code builds a
 368  * translation table to translate what Linux thinks are "physical"
 369  * addresses to the actual real addresses.  This allows us to make
 370  * it appear to Linux that we have contiguous memory starting at
 371  * physical address zero while in fact this could be far from the truth.
 372  * To avoid confusion, I'll let the words physical and/or real address
 373  * apply to the Linux addresses while I'll use "absolute address" to
 374  * refer to the actual hardware real address.
 375  *
 376  * build_iSeries_Memory_Map gets information from the Hypervisor and
 377  * looks at the Main Store VPD to determine the absolute addresses
 378  * of the memory that has been assigned to our partition and builds
 379  * a table used to translate Linux's physical addresses to these
 380  * absolute addresses.  Absolute addresses are needed when
 381  * communicating with the hypervisor (e.g. to build HPT entries)
 382  *
 383  * Returns the physical memory size
 384  */
 385
 386 static unsigned long __init build_iSeries_Memory_Map(void)
 387 {
 388         u32 loadAreaFirstChunk, loadAreaLastChunk, loadAreaSize;
 389         u32 nextPhysChunk;
 390         u32 hptFirstChunk, hptLastChunk, hptSizeChunks, hptSizePages;
 391         u32 totalChunks,moreChunks;
 392         u32 currChunk, thisChunk, absChunk;
 393         u32 currDword;
 394         u32 chunkBit;
 395         u64 map;
 396         struct MemoryBlock mb[32];
 397         unsigned long numMemoryBlocks, curBlock;
 398
 399         /* Chunk size on iSeries is 256K bytes */
 400         totalChunks = (u32)HvLpConfig_getMsChunks();
 401         mschunks_alloc(totalChunks);
 402
 403         /*
 404          * Get absolute address of our load area
 405          * and map it to physical address 0
 406          * This guarantees that the loadarea ends up at physical 0
 407          * otherwise, it might not be returned by PLIC as the first
 408          * chunks
 409          */
 410
 411         loadAreaFirstChunk = (u32)addr_to_chunk(itLpNaca.xLoadAreaAddr);
 412         loadAreaSize =  itLpNaca.xLoadAreaChunks;
 413
 414         /*
 415          * Only add the pages already mapped here.
 416          * Otherwise we might add the hpt pages
 417          * The rest of the pages of the load area
 418          * aren't in the HPT yet and can still
 419          * be assigned an arbitrary physical address
 420          */
 421         if ((loadAreaSize * 64) > HvPagesToMap)
 422                 loadAreaSize = HvPagesToMap / 64;
 423
 424         loadAreaLastChunk = loadAreaFirstChunk + loadAreaSize - 1;
 425
 426         /*
 427          * TODO Do we need to do something if the HPT is in the 64MB load area?
 428          * This would be required if the itLpNaca.xLoadAreaChunks includes
 429          * the HPT size
 430          */
 431
 432         printk("Mapping load area - physical addr = 0000000000000000\n"
 433                 "                    absolute addr = %016lx\n",
 434                 chunk_to_addr(loadAreaFirstChunk));
 435         printk("Load area size %dK\n", loadAreaSize * 256);
 436
 437         for (nextPhysChunk = 0; nextPhysChunk < loadAreaSize; ++nextPhysChunk)
 438                 mschunks_map.mapping[nextPhysChunk] =
 439                         loadAreaFirstChunk + nextPhysChunk;
 440
 441         /*
 442          * Get absolute address of our HPT and remember it so
 443          * we won't map it to any physical address
 444          */
 445         hptFirstChunk = (u32)addr_to_chunk(HvCallHpt_getHptAddress());
 446         hptSizePages = (u32)HvCallHpt_getHptPages();
 447         hptSizeChunks = hptSizePages >>
 448                 (MSCHUNKS_CHUNK_SHIFT - HW_PAGE_SHIFT);
 449         hptLastChunk = hptFirstChunk + hptSizeChunks - 1;
 450
 451         printk("HPT absolute addr = %016lx, size = %dK\n",
 452                         chunk_to_addr(hptFirstChunk), hptSizeChunks * 256);
 453
 454         /*
 455          * Determine if absolute memory has any
 456          * holes so that we can interpret the
 457          * access map we get back from the hypervisor
 458          * correctly.
 459          */
 460         numMemoryBlocks = iSeries_process_mainstore_vpd(mb, 32);
 461
 462         /*
 463          * Process the main store access map from the hypervisor
 464          * to build up our physical -> absolute translation table
 465          */
 466         curBlock = 0;
 467         currChunk = 0;
 468         currDword = 0;
 469         moreChunks = totalChunks;
 470
 471         while (moreChunks) {
 472                 map = HvCallSm_get64BitsOfAccessMap(itLpNaca.xLpIndex,
 473                                 currDword);
 474                 thisChunk = currChunk;
 475                 while (map) {
 476                         chunkBit = map >> 63;
 477                         map <<= 1;
 478                         if (chunkBit) {
 479                                 --moreChunks;
 480                                 while (thisChunk >= mb[curBlock].logicalEnd) {
 481                                         ++curBlock;
 482                                         if (curBlock >= numMemoryBlocks)
 483                                                 panic("out of memory blocks");
 484                                 }
 485                                 if (thisChunk < mb[curBlock].logicalStart)
 486                                         panic("memory block error");
 487
 488                                 absChunk = mb[curBlock].absStart +
 489                                         (thisChunk - mb[curBlock].logicalStart);
 490                                 if (((absChunk < hptFirstChunk) ||
 491                                      (absChunk > hptLastChunk)) &&
 492                                     ((absChunk < loadAreaFirstChunk) ||
 493                                      (absChunk > loadAreaLastChunk))) {
 494                                         mschunks_map.mapping[nextPhysChunk] =
 495                                                 absChunk;
 496                                         ++nextPhysChunk;
 497                                 }
 498                         }
 499                         ++thisChunk;
 500                 }
 501                 ++currDword;
 502                 currChunk += 64;
 503         }
 504
 505         /*
 506          * main store size (in chunks) is
 507          *   totalChunks - hptSizeChunks
 508          * which should be equal to
 509          *   nextPhysChunk
 510          */
 511         return chunk_to_addr(nextPhysChunk);
 512 }
 513
 514 /*
 515  * Document me.
 516  */
 517 static void __init iSeries_setup_arch(void)
 518 {
 519         if (get_lppaca()->shared_proc) {
 520                 ppc_md.idle_loop = iseries_shared_idle;
 521                 printk(KERN_DEBUG "Using shared processor idle loop\n");
 522         } else {
 523                 ppc_md.idle_loop = iseries_dedicated_idle;
 524                 printk(KERN_DEBUG "Using dedicated idle loop\n");
 525         }
 526
 527         /* Setup the Lp Event Queue */
 528         setup_hvlpevent_queue();
 529
 530         printk("Max  logical processors = %d\n",
 531                         itVpdAreas.xSlicMaxLogicalProcs);
 532         printk("Max physical processors = %d\n",
 533                         itVpdAreas.xSlicMaxPhysicalProcs);
 534 }
 535
 536 static void iSeries_show_cpuinfo(struct seq_file *m)
 537 {
 538         seq_printf(m, "machine\t\t: 64-bit iSeries Logical Partition\n");
 539 }
 540
 541 static void __init iSeries_progress(char * st, unsigned short code)
 542 {
 543         printk("Progress: [%04x] - %s\n", (unsigned)code, st);
 544         mf_display_progress(code);
 545 }
 546
 547 static void __init iSeries_fixup_klimit(void)
 548 {
 549         /*
 550          * Change klimit to take into account any ram disk
 551          * that may be included
 552          */
 553         if (naca.xRamDisk)
 554                 klimit = KERNELBASE + (u64)naca.xRamDisk +
 555                         (naca.xRamDiskSize * HW_PAGE_SIZE);
 556 }
 557
 558 static int __init iSeries_src_init(void)
 559 {
 560         /* clear the progress line */
 561         ppc_md.progress(" ", 0xffff);
 562         return 0;
 563 }
 564
 565 late_initcall(iSeries_src_init);
 566
 567 static inline void process_iSeries_events(void)
 568 {
 569         asm volatile ("li 0,0x5555; sc" : : : "r0", "r3");
 570 }
 571
 572 static void yield_shared_processor(void)
 573 {
 574         unsigned long tb;
 575
 576         HvCall_setEnabledInterrupts(HvCall_MaskIPI |
 577                                     HvCall_MaskLpEvent |
 578                                     HvCall_MaskLpProd |
 579                                     HvCall_MaskTimeout);
 580
 581         tb = get_tb();
 582         /* Compute future tb value when yield should expire */
 583         HvCall_yieldProcessor(HvCall_YieldTimed, tb+tb_ticks_per_jiffy);
 584
 585         /*
 586          * The decrementer stops during the yield.  Force a fake decrementer
 587          * here and let the timer_interrupt code sort out the actual time.
 588          */
 589         get_lppaca()->int_dword.fields.decr_int = 1;
 590         ppc64_runlatch_on();
 591         process_iSeries_events();
 592 }
 593
 594 static void iseries_shared_idle(void)
 595 {
 596         while (1) {
 597                 while (!need_resched() && !hvlpevent_is_pending()) {
 598                         local_irq_disable();
 599                         ppc64_runlatch_off();
 600
 601                         /* Recheck with irqs off */
 602                         if (!need_resched() && !hvlpevent_is_pending())
 603                                 yield_shared_processor();
 604
 605                         HMT_medium();
 606                         local_irq_enable();
 607                 }
 608
 609                 ppc64_runlatch_on();
 610
 611                 if (hvlpevent_is_pending())
 612                         process_iSeries_events();
 613
 614                 preempt_enable_no_resched();
 615                 schedule();
 616                 preempt_disable();
 617         }
 618 }
 619
 620 static void iseries_dedicated_idle(void)
 621 {
 622         set_thread_flag(TIF_POLLING_NRFLAG);
 623
 624         while (1) {
 625                 if (!need_resched()) {
 626                         while (!need_resched()) {
 627                                 ppc64_runlatch_off();
 628                                 HMT_low();
 629
 630                                 if (hvlpevent_is_pending()) {
 631                                         HMT_medium();
 632                                         ppc64_runlatch_on();
 633                                         process_iSeries_events();
 634                                 }
 635                         }
 636
 637                         HMT_medium();
 638                 }
 639
 640                 ppc64_runlatch_on();
 641                 preempt_enable_no_resched();
 642                 schedule();
 643                 preempt_disable();
 644         }
 645 }
 646
 647 #ifndef CONFIG_PCI
 648 void __init iSeries_init_IRQ(void) { }
 649 #endif
 650
 651 static int __init iseries_probe(void)
 652 {
 653         unsigned long root = of_get_flat_dt_root();
 654         if (!of_flat_dt_is_compatible(root, "IBM,iSeries"))
 655                 return 0;
 656
 657         powerpc_firmware_features |= FW_FEATURE_ISERIES;
 658         powerpc_firmware_features |= FW_FEATURE_LPAR;
 659
 660         hpte_init_iSeries();
 661
 662         return 1;
 663 }
 664
 665 define_machine(iseries) {
 666         .name           = "iSeries",
 667         .setup_arch     = iSeries_setup_arch,
 668         .show_cpuinfo   = iSeries_show_cpuinfo,
 669         .init_IRQ       = iSeries_init_IRQ,
 670         .get_irq        = iSeries_get_irq,
 671         .init_early     = iSeries_init_early,
 672         .pcibios_fixup  = iSeries_pci_final_fixup,
 673         .restart        = mf_reboot,
 674         .power_off      = mf_power_off,
 675         .halt           = mf_power_off,
 676         .get_boot_time  = iSeries_get_boot_time,
 677         .set_rtc_time   = iSeries_set_rtc_time,
 678         .get_rtc_time   = iSeries_get_rtc_time,
 679         .calibrate_decr = generic_calibrate_decr,
 680         .progress       = iSeries_progress,
 681         .probe          = iseries_probe,
 682         /* XXX Implement enable_pmcs for iSeries */
 683 };
 684
 685 void * __init iSeries_early_setup(void)
 686 {
 687         unsigned long phys_mem_size;
 688
 689         iSeries_fixup_klimit();
 690
 691         /*
 692          * Initialize the table which translate Linux physical addresses to
 693          * AS/400 absolute addresses
 694          */
 695         phys_mem_size = build_iSeries_Memory_Map();
 696
 697         iSeries_get_cmdline();
 698
 699         return (void *) __pa(build_flat_dt(phys_mem_size));
 700 }
 701
 702 static void hvputc(char c)
 703 {
 704         if (c == '\n')
 705                 hvputc('\r');
 706
 707         HvCall_writeLogBuffer(&c, 1);
 708 }
 709
 710 void __init udbg_init_iseries(void)
 711 {
 712         udbg_putc = hvputc;
 713 }