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