Linux-2.6.12-rc2

[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / arch / ppc64 / kernel / iSeries_setup.c

/*
 *    Copyright (c) 2000 Mike Corrigan <mikejc@us.ibm.com>
 *    Copyright (c) 1999-2000 Grant Erickson <grant@lcse.umn.edu>
 *
 *    Module name: iSeries_setup.c
 *
 *    Description:
 *      Architecture- / platform-specific boot-time initialization code for
 *      the IBM iSeries LPAR.  Adapted from original code by Grant Erickson and
 *      code by Gary Thomas, Cort Dougan <cort@fsmlabs.com>, and Dan Malek
 *      <dan@net4x.com>.
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */

#undef DEBUG

#include <linux/config.h>
#include <linux/init.h>
#include <linux/threads.h>
#include <linux/smp.h>
#include <linux/param.h>
#include <linux/string.h>
#include <linux/bootmem.h>
#include <linux/initrd.h>
#include <linux/seq_file.h>
#include <linux/kdev_t.h>
#include <linux/major.h>
#include <linux/root_dev.h>

#include <asm/processor.h>
#include <asm/machdep.h>
#include <asm/page.h>
#include <asm/mmu.h>
#include <asm/pgtable.h>
#include <asm/mmu_context.h>
#include <asm/cputable.h>
#include <asm/sections.h>
#include <asm/iommu.h>

#include <asm/time.h>
#include "iSeries_setup.h"
#include <asm/naca.h>
#include <asm/paca.h>
#include <asm/cache.h>
#include <asm/sections.h>
#include <asm/iSeries/LparData.h>
#include <asm/iSeries/HvCallHpt.h>
#include <asm/iSeries/HvLpConfig.h>
#include <asm/iSeries/HvCallEvent.h>
#include <asm/iSeries/HvCallSm.h>
#include <asm/iSeries/HvCallXm.h>
#include <asm/iSeries/ItLpQueue.h>
#include <asm/iSeries/IoHriMainStore.h>
#include <asm/iSeries/iSeries_proc.h>
#include <asm/iSeries/mf.h>
#include <asm/iSeries/HvLpEvent.h>
#include <asm/iSeries/iSeries_irq.h>

extern void hvlog(char *fmt, ...);

#ifdef DEBUG
#define DBG(fmt...) hvlog(fmt)
#else
#define DBG(fmt...)
#endif

/* Function Prototypes */
extern void ppcdbg_initialize(void);

static void build_iSeries_Memory_Map(void);
static void setup_iSeries_cache_sizes(void);
static void iSeries_bolt_kernel(unsigned long saddr, unsigned long eaddr);
extern void iSeries_pci_final_fixup(void);

/* Global Variables */
static unsigned long procFreqHz;
static unsigned long procFreqMhz;
static unsigned long procFreqMhzHundreths;

static unsigned long tbFreqHz;
static unsigned long tbFreqMhz;
static unsigned long tbFreqMhzHundreths;

int piranha_simulator;

extern int rd_size;             /* Defined in drivers/block/rd.c */
extern unsigned long klimit;
extern unsigned long embedded_sysmap_start;
extern unsigned long embedded_sysmap_end;

extern unsigned long iSeries_recal_tb;
extern unsigned long iSeries_recal_titan;

static int mf_initialized;

struct MemoryBlock {
        unsigned long absStart;
        unsigned long absEnd;
        unsigned long logicalStart;
        unsigned long logicalEnd;
};

/*
 * Process the main store vpd to determine where the holes in memory are
 * and return the number of physical blocks and fill in the array of
 * block data.
 */
static unsigned long iSeries_process_Condor_mainstore_vpd(
                struct MemoryBlock *mb_array, unsigned long max_entries)
{
        unsigned long holeFirstChunk, holeSizeChunks;
        unsigned long numMemoryBlocks = 1;
        struct IoHriMainStoreSegment4 *msVpd =
                (struct IoHriMainStoreSegment4 *)xMsVpd;
        unsigned long holeStart = msVpd->nonInterleavedBlocksStartAdr;
        unsigned long holeEnd = msVpd->nonInterleavedBlocksEndAdr;
        unsigned long holeSize = holeEnd - holeStart;

        printk("Mainstore_VPD: Condor\n");
        /*
         * Determine if absolute memory has any
         * holes so that we can interpret the
         * access map we get back from the hypervisor
         * correctly.
         */
        mb_array[0].logicalStart = 0;
        mb_array[0].logicalEnd = 0x100000000;
        mb_array[0].absStart = 0;
        mb_array[0].absEnd = 0x100000000;

        if (holeSize) {
                numMemoryBlocks = 2;
                holeStart = holeStart & 0x000fffffffffffff;
                holeStart = addr_to_chunk(holeStart);
                holeFirstChunk = holeStart;
                holeSize = addr_to_chunk(holeSize);
                holeSizeChunks = holeSize;
                printk( "Main store hole: start chunk = %0lx, size = %0lx chunks\n",
                                holeFirstChunk, holeSizeChunks );
                mb_array[0].logicalEnd = holeFirstChunk;
                mb_array[0].absEnd = holeFirstChunk;
                mb_array[1].logicalStart = holeFirstChunk;
                mb_array[1].logicalEnd = 0x100000000 - holeSizeChunks;
                mb_array[1].absStart = holeFirstChunk + holeSizeChunks;
                mb_array[1].absEnd = 0x100000000;
        }
        return numMemoryBlocks;
}

#define MaxSegmentAreas                 32
#define MaxSegmentAdrRangeBlocks        128
#define MaxAreaRangeBlocks              4

static unsigned long iSeries_process_Regatta_mainstore_vpd(
                struct MemoryBlock *mb_array, unsigned long max_entries)
{
        struct IoHriMainStoreSegment5 *msVpdP =
                (struct IoHriMainStoreSegment5 *)xMsVpd;
        unsigned long numSegmentBlocks = 0;
        u32 existsBits = msVpdP->msAreaExists;
        unsigned long area_num;

        printk("Mainstore_VPD: Regatta\n");

        for (area_num = 0; area_num < MaxSegmentAreas; ++area_num ) {
                unsigned long numAreaBlocks;
                struct IoHriMainStoreArea4 *currentArea;

                if (existsBits & 0x80000000) {
                        unsigned long block_num;

                        currentArea = &msVpdP->msAreaArray[area_num];
                        numAreaBlocks = currentArea->numAdrRangeBlocks;
                        printk("ms_vpd: processing area %2ld  blocks=%ld",
                                        area_num, numAreaBlocks);
                        for (block_num = 0; block_num < numAreaBlocks;
                                        ++block_num ) {
                                /* Process an address range block */
                                struct MemoryBlock tempBlock;
                                unsigned long i;

                                tempBlock.absStart =
                                        (unsigned long)currentArea->xAdrRangeBlock[block_num].blockStart;
                                tempBlock.absEnd =
                                        (unsigned long)currentArea->xAdrRangeBlock[block_num].blockEnd;
                                tempBlock.logicalStart = 0;
                                tempBlock.logicalEnd   = 0;
                                printk("\n          block %ld absStart=%016lx absEnd=%016lx",
                                                block_num, tempBlock.absStart,
                                                tempBlock.absEnd);

                                for (i = 0; i < numSegmentBlocks; ++i) {
                                        if (mb_array[i].absStart ==
                                                        tempBlock.absStart)
                                                break;
                                }
                                if (i == numSegmentBlocks) {
                                        if (numSegmentBlocks == max_entries)
                                                panic("iSeries_process_mainstore_vpd: too many memory blocks");
                                        mb_array[numSegmentBlocks] = tempBlock;
                                        ++numSegmentBlocks;
                                } else
                                        printk(" (duplicate)");
                        }
                        printk("\n");
                }
                existsBits <<= 1;
        }
        /* Now sort the blocks found into ascending sequence */
        if (numSegmentBlocks > 1) {
                unsigned long m, n;

                for (m = 0; m < numSegmentBlocks - 1; ++m) {
                        for (n = numSegmentBlocks - 1; m < n; --n) {
                                if (mb_array[n].absStart <
                                                mb_array[n-1].absStart) {
                                        struct MemoryBlock tempBlock;

                                        tempBlock = mb_array[n];
                                        mb_array[n] = mb_array[n-1];
                                        mb_array[n-1] = tempBlock;
                                }
                        }
                }
        }
        /*
         * Assign "logical" addresses to each block.  These
         * addresses correspond to the hypervisor "bitmap" space.
         * Convert all addresses into units of 256K chunks.
         */
        {
        unsigned long i, nextBitmapAddress;

        printk("ms_vpd: %ld sorted memory blocks\n", numSegmentBlocks);
        nextBitmapAddress = 0;
        for (i = 0; i < numSegmentBlocks; ++i) {
                unsigned long length = mb_array[i].absEnd -
                        mb_array[i].absStart;

                mb_array[i].logicalStart = nextBitmapAddress;
                mb_array[i].logicalEnd = nextBitmapAddress + length;
                nextBitmapAddress += length;
                printk("          Bitmap range: %016lx - %016lx\n"
                                "        Absolute range: %016lx - %016lx\n",
                                mb_array[i].logicalStart,
                                mb_array[i].logicalEnd,
                                mb_array[i].absStart, mb_array[i].absEnd);
                mb_array[i].absStart = addr_to_chunk(mb_array[i].absStart &
                                0x000fffffffffffff);
                mb_array[i].absEnd = addr_to_chunk(mb_array[i].absEnd &
                                0x000fffffffffffff);
                mb_array[i].logicalStart =
                        addr_to_chunk(mb_array[i].logicalStart);
                mb_array[i].logicalEnd = addr_to_chunk(mb_array[i].logicalEnd);
        }
        }

        return numSegmentBlocks;
}

static unsigned long iSeries_process_mainstore_vpd(struct MemoryBlock *mb_array,
                unsigned long max_entries)
{
        unsigned long i;
        unsigned long mem_blocks = 0;

        if (cpu_has_feature(CPU_FTR_SLB))
                mem_blocks = iSeries_process_Regatta_mainstore_vpd(mb_array,
                                max_entries);
        else
                mem_blocks = iSeries_process_Condor_mainstore_vpd(mb_array,
                                max_entries);

        printk("Mainstore_VPD: numMemoryBlocks = %ld \n", mem_blocks);
        for (i = 0; i < mem_blocks; ++i) {
                printk("Mainstore_VPD: block %3ld logical chunks %016lx - %016lx\n"
                       "                             abs chunks %016lx - %016lx\n",
                        i, mb_array[i].logicalStart, mb_array[i].logicalEnd,
                        mb_array[i].absStart, mb_array[i].absEnd);
        }
        return mem_blocks;
}

static void __init iSeries_get_cmdline(void)
{
        char *p, *q;

        /* copy the command line parameter from the primary VSP  */
        HvCallEvent_dmaToSp(cmd_line, 2 * 64* 1024, 256,
                        HvLpDma_Direction_RemoteToLocal);

        p = cmd_line;
        q = cmd_line + 255;
        while(p < q) {
                if (!*p || *p == '\n')
                        break;
                ++p;
        }
        *p = 0;
}

static void __init iSeries_init_early(void)
{
        extern unsigned long memory_limit;

        DBG(" -> iSeries_init_early()\n");

        ppcdbg_initialize();

#if defined(CONFIG_BLK_DEV_INITRD)
        /*
         * If the init RAM disk has been configured and there is
         * a non-zero starting address for it, set it up
         */
        if (naca.xRamDisk) {
                initrd_start = (unsigned long)__va(naca.xRamDisk);
                initrd_end = initrd_start + naca.xRamDiskSize * PAGE_SIZE;
                initrd_below_start_ok = 1;      // ramdisk in kernel space
                ROOT_DEV = Root_RAM0;
                if (((rd_size * 1024) / PAGE_SIZE) < naca.xRamDiskSize)
                        rd_size = (naca.xRamDiskSize * PAGE_SIZE) / 1024;
        } else
#endif /* CONFIG_BLK_DEV_INITRD */
        {
            /* ROOT_DEV = MKDEV(VIODASD_MAJOR, 1); */
        }

        iSeries_recal_tb = get_tb();
        iSeries_recal_titan = HvCallXm_loadTod();

        /*
         * Cache sizes must be initialized before hpte_init_iSeries is called
         * as the later need them for flush_icache_range()
         */
        setup_iSeries_cache_sizes();

        /*
         * Initialize the hash table management pointers
         */
        hpte_init_iSeries();

        /*
         * Initialize the DMA/TCE management
         */
        iommu_init_early_iSeries();

        /*
         * Initialize the table which translate Linux physical addresses to
         * AS/400 absolute addresses
         */
        build_iSeries_Memory_Map();

        iSeries_get_cmdline();

        /* Save unparsed command line copy for /proc/cmdline */
        strlcpy(saved_command_line, cmd_line, COMMAND_LINE_SIZE);

        /* Parse early parameters, in particular mem=x */
        parse_early_param();

        if (memory_limit) {
                if (memory_limit < systemcfg->physicalMemorySize)
                        systemcfg->physicalMemorySize = memory_limit;
                else {
                        printk("Ignoring mem=%lu >= ram_top.\n", memory_limit);
                        memory_limit = 0;
                }
        }

        /* Bolt kernel mappings for all of memory (or just a bit if we've got a limit) */
        iSeries_bolt_kernel(0, systemcfg->physicalMemorySize);

        lmb_init();
        lmb_add(0, systemcfg->physicalMemorySize);
        lmb_analyze();
        lmb_reserve(0, __pa(klimit));

        /* Initialize machine-dependency vectors */
#ifdef CONFIG_SMP
        smp_init_iSeries();
#endif
        if (itLpNaca.xPirEnvironMode == 0)
                piranha_simulator = 1;

        /* Associate Lp Event Queue 0 with processor 0 */
        HvCallEvent_setLpEventQueueInterruptProc(0, 0);

        mf_init();
        mf_initialized = 1;
        mb();

        /* If we were passed an initrd, set the ROOT_DEV properly if the values
         * look sensible. If not, clear initrd reference.
         */
#ifdef CONFIG_BLK_DEV_INITRD
        if (initrd_start >= KERNELBASE && initrd_end >= KERNELBASE &&
            initrd_end > initrd_start)
                ROOT_DEV = Root_RAM0;
        else
                initrd_start = initrd_end = 0;
#endif /* CONFIG_BLK_DEV_INITRD */

        DBG(" <- iSeries_init_early()\n");
}

/*
 * The iSeries may have very large memories ( > 128 GB ) and a partition
 * may get memory in "chunks" that may be anywhere in the 2**52 real
 * address space.  The chunks are 256K in size.  To map this to the
 * memory model Linux expects, the AS/400 specific code builds a
 * translation table to translate what Linux thinks are "physical"
 * addresses to the actual real addresses.  This allows us to make
 * it appear to Linux that we have contiguous memory starting at
 * physical address zero while in fact this could be far from the truth.
 * To avoid confusion, I'll let the words physical and/or real address
 * apply to the Linux addresses while I'll use "absolute address" to
 * refer to the actual hardware real address.
 *
 * build_iSeries_Memory_Map gets information from the Hypervisor and
 * looks at the Main Store VPD to determine the absolute addresses
 * of the memory that has been assigned to our partition and builds
 * a table used to translate Linux's physical addresses to these
 * absolute addresses.  Absolute addresses are needed when
 * communicating with the hypervisor (e.g. to build HPT entries)
 */

static void __init build_iSeries_Memory_Map(void)
{
        u32 loadAreaFirstChunk, loadAreaLastChunk, loadAreaSize;
        u32 nextPhysChunk;
        u32 hptFirstChunk, hptLastChunk, hptSizeChunks, hptSizePages;
        u32 num_ptegs;
        u32 totalChunks,moreChunks;
        u32 currChunk, thisChunk, absChunk;
        u32 currDword;
        u32 chunkBit;
        u64 map;
        struct MemoryBlock mb[32];
        unsigned long numMemoryBlocks, curBlock;

        /* Chunk size on iSeries is 256K bytes */
        totalChunks = (u32)HvLpConfig_getMsChunks();
        klimit = msChunks_alloc(klimit, totalChunks, 1UL << 18);

        /*
         * Get absolute address of our load area
         * and map it to physical address 0
         * This guarantees that the loadarea ends up at physical 0
         * otherwise, it might not be returned by PLIC as the first
         * chunks
         */

        loadAreaFirstChunk = (u32)addr_to_chunk(itLpNaca.xLoadAreaAddr);
        loadAreaSize =  itLpNaca.xLoadAreaChunks;

        /*
         * Only add the pages already mapped here.
         * Otherwise we might add the hpt pages
         * The rest of the pages of the load area
         * aren't in the HPT yet and can still
         * be assigned an arbitrary physical address
         */
        if ((loadAreaSize * 64) > HvPagesToMap)
                loadAreaSize = HvPagesToMap / 64;

        loadAreaLastChunk = loadAreaFirstChunk + loadAreaSize - 1;

        /*
         * TODO Do we need to do something if the HPT is in the 64MB load area?
         * This would be required if the itLpNaca.xLoadAreaChunks includes
         * the HPT size
         */

        printk("Mapping load area - physical addr = 0000000000000000\n"
                "                    absolute addr = %016lx\n",
                chunk_to_addr(loadAreaFirstChunk));
        printk("Load area size %dK\n", loadAreaSize * 256);

        for (nextPhysChunk = 0; nextPhysChunk < loadAreaSize; ++nextPhysChunk)
                msChunks.abs[nextPhysChunk] =
                        loadAreaFirstChunk + nextPhysChunk;

        /*
         * Get absolute address of our HPT and remember it so
         * we won't map it to any physical address
         */
        hptFirstChunk = (u32)addr_to_chunk(HvCallHpt_getHptAddress());
        hptSizePages = (u32)HvCallHpt_getHptPages();
        hptSizeChunks = hptSizePages >> (msChunks.chunk_shift - PAGE_SHIFT);
        hptLastChunk = hptFirstChunk + hptSizeChunks - 1;

        printk("HPT absolute addr = %016lx, size = %dK\n",
                        chunk_to_addr(hptFirstChunk), hptSizeChunks * 256);

        /* Fill in the hashed page table hash mask */
        num_ptegs = hptSizePages *
                (PAGE_SIZE / (sizeof(HPTE) * HPTES_PER_GROUP));
        htab_hash_mask = num_ptegs - 1;

        /*
         * The actual hashed page table is in the hypervisor,
         * we have no direct access
         */
        htab_address = NULL;

        /*
         * Determine if absolute memory has any
         * holes so that we can interpret the
         * access map we get back from the hypervisor
         * correctly.
         */
        numMemoryBlocks = iSeries_process_mainstore_vpd(mb, 32);

        /*
         * Process the main store access map from the hypervisor
         * to build up our physical -> absolute translation table
         */
        curBlock = 0;
        currChunk = 0;
        currDword = 0;
        moreChunks = totalChunks;

        while (moreChunks) {
                map = HvCallSm_get64BitsOfAccessMap(itLpNaca.xLpIndex,
                                currDword);
                thisChunk = currChunk;
                while (map) {
                        chunkBit = map >> 63;
                        map <<= 1;
                        if (chunkBit) {
                                --moreChunks;
                                while (thisChunk >= mb[curBlock].logicalEnd) {
                                        ++curBlock;
                                        if (curBlock >= numMemoryBlocks)
                                                panic("out of memory blocks");
                                }
                                if (thisChunk < mb[curBlock].logicalStart)
                                        panic("memory block error");

                                absChunk = mb[curBlock].absStart +
                                        (thisChunk - mb[curBlock].logicalStart);
                                if (((absChunk < hptFirstChunk) ||
                                     (absChunk > hptLastChunk)) &&
                                    ((absChunk < loadAreaFirstChunk) ||
                                     (absChunk > loadAreaLastChunk))) {
                                        msChunks.abs[nextPhysChunk] = absChunk;
                                        ++nextPhysChunk;
                                }
                        }
                        ++thisChunk;
                }
                ++currDword;
                currChunk += 64;
        }

        /*
         * main store size (in chunks) is
         *   totalChunks - hptSizeChunks
         * which should be equal to
         *   nextPhysChunk
         */
        systemcfg->physicalMemorySize = chunk_to_addr(nextPhysChunk);
}

/*
 * Set up the variables that describe the cache line sizes
 * for this machine.
 */
static void __init setup_iSeries_cache_sizes(void)
{
        unsigned int i, n;
        unsigned int procIx = get_paca()->lppaca.dyn_hv_phys_proc_index;

        systemcfg->icache_size =
        ppc64_caches.isize = xIoHriProcessorVpd[procIx].xInstCacheSize * 1024;
        systemcfg->icache_line_size =
        ppc64_caches.iline_size =
                xIoHriProcessorVpd[procIx].xInstCacheOperandSize;
        systemcfg->dcache_size =
        ppc64_caches.dsize =
                xIoHriProcessorVpd[procIx].xDataL1CacheSizeKB * 1024;
        systemcfg->dcache_line_size =
        ppc64_caches.dline_size =
                xIoHriProcessorVpd[procIx].xDataCacheOperandSize;
        ppc64_caches.ilines_per_page = PAGE_SIZE / ppc64_caches.iline_size;
        ppc64_caches.dlines_per_page = PAGE_SIZE / ppc64_caches.dline_size;

        i = ppc64_caches.iline_size;
        n = 0;
        while ((i = (i / 2)))
                ++n;
        ppc64_caches.log_iline_size = n;

        i = ppc64_caches.dline_size;
        n = 0;
        while ((i = (i / 2)))
                ++n;
        ppc64_caches.log_dline_size = n;

        printk("D-cache line size = %d\n",
                        (unsigned int)ppc64_caches.dline_size);
        printk("I-cache line size = %d\n",
                        (unsigned int)ppc64_caches.iline_size);
}

/*
 * Create a pte. Used during initialization only.
 */
static void iSeries_make_pte(unsigned long va, unsigned long pa,
                             int mode)
{
        HPTE local_hpte, rhpte;
        unsigned long hash, vpn;
        long slot;

        vpn = va >> PAGE_SHIFT;
        hash = hpt_hash(vpn, 0);

        local_hpte.dw1.dword1 = pa | mode;
        local_hpte.dw0.dword0 = 0;
        local_hpte.dw0.dw0.avpn = va >> 23;
        local_hpte.dw0.dw0.bolted = 1;          /* bolted */
        local_hpte.dw0.dw0.v = 1;

        slot = HvCallHpt_findValid(&rhpte, vpn);
        if (slot < 0) {
                /* Must find space in primary group */
                panic("hash_page: hpte already exists\n");
        }
        HvCallHpt_addValidate(slot, 0, (HPTE *)&local_hpte );
}

/*
 * Bolt the kernel addr space into the HPT
 */
static void __init iSeries_bolt_kernel(unsigned long saddr, unsigned long eaddr)
{
        unsigned long pa;
        unsigned long mode_rw = _PAGE_ACCESSED | _PAGE_COHERENT | PP_RWXX;
        HPTE hpte;

        for (pa = saddr; pa < eaddr ;pa += PAGE_SIZE) {
                unsigned long ea = (unsigned long)__va(pa);
                unsigned long vsid = get_kernel_vsid(ea);
                unsigned long va = (vsid << 28) | (pa & 0xfffffff);
                unsigned long vpn = va >> PAGE_SHIFT;
                unsigned long slot = HvCallHpt_findValid(&hpte, vpn);

                /* Make non-kernel text non-executable */
                if (!in_kernel_text(ea))
                        mode_rw |= HW_NO_EXEC;

                if (hpte.dw0.dw0.v) {
                        /* HPTE exists, so just bolt it */
                        HvCallHpt_setSwBits(slot, 0x10, 0);
                        /* And make sure the pp bits are correct */
                        HvCallHpt_setPp(slot, PP_RWXX);
                } else
                        /* No HPTE exists, so create a new bolted one */
                        iSeries_make_pte(va, phys_to_abs(pa), mode_rw);
        }
}

extern unsigned long ppc_proc_freq;
extern unsigned long ppc_tb_freq;

/*
 * Document me.
 */
static void __init iSeries_setup_arch(void)
{
        void *eventStack;
        unsigned procIx = get_paca()->lppaca.dyn_hv_phys_proc_index;

        /* Add an eye catcher and the systemcfg layout version number */
        strcpy(systemcfg->eye_catcher, "SYSTEMCFG:PPC64");
        systemcfg->version.major = SYSTEMCFG_MAJOR;
        systemcfg->version.minor = SYSTEMCFG_MINOR;

        /* Setup the Lp Event Queue */

        /* Allocate a page for the Event Stack
         * The hypervisor wants the absolute real address, so
         * we subtract out the KERNELBASE and add in the
         * absolute real address of the kernel load area
         */
        eventStack = alloc_bootmem_pages(LpEventStackSize);
        memset(eventStack, 0, LpEventStackSize);

        /* Invoke the hypervisor to initialize the event stack */
        HvCallEvent_setLpEventStack(0, eventStack, LpEventStackSize);

        /* Initialize fields in our Lp Event Queue */
        xItLpQueue.xSlicEventStackPtr = (char *)eventStack;
        xItLpQueue.xSlicCurEventPtr = (char *)eventStack;
        xItLpQueue.xSlicLastValidEventPtr = (char *)eventStack +
                                        (LpEventStackSize - LpEventMaxSize);
        xItLpQueue.xIndex = 0;

        /* Compute processor frequency */
        procFreqHz = ((1UL << 34) * 1000000) /
                        xIoHriProcessorVpd[procIx].xProcFreq;
        procFreqMhz = procFreqHz / 1000000;
        procFreqMhzHundreths = (procFreqHz / 10000) - (procFreqMhz * 100);
        ppc_proc_freq = procFreqHz;

        /* Compute time base frequency */
        tbFreqHz = ((1UL << 32) * 1000000) /
                xIoHriProcessorVpd[procIx].xTimeBaseFreq;
        tbFreqMhz = tbFreqHz / 1000000;
        tbFreqMhzHundreths = (tbFreqHz / 10000) - (tbFreqMhz * 100);
        ppc_tb_freq = tbFreqHz;

        printk("Max  logical processors = %d\n",
                        itVpdAreas.xSlicMaxLogicalProcs);
        printk("Max physical processors = %d\n",
                        itVpdAreas.xSlicMaxPhysicalProcs);
        printk("Processor frequency = %lu.%02lu\n", procFreqMhz,
                        procFreqMhzHundreths);
        printk("Time base frequency = %lu.%02lu\n", tbFreqMhz,
                        tbFreqMhzHundreths);
        systemcfg->processor = xIoHriProcessorVpd[procIx].xPVR;
        printk("Processor version = %x\n", systemcfg->processor);
}

static void iSeries_get_cpuinfo(struct seq_file *m)
{
        seq_printf(m, "machine\t\t: 64-bit iSeries Logical Partition\n");
}

/*
 * Document me.
 * and Implement me.
 */
static int iSeries_get_irq(struct pt_regs *regs)
{
        /* -2 means ignore this interrupt */
        return -2;
}

/*
 * Document me.
 */
static void iSeries_restart(char *cmd)
{
        mf_reboot();
}

/*
 * Document me.
 */
static void iSeries_power_off(void)
{
        mf_power_off();
}

/*
 * Document me.
 */
static void iSeries_halt(void)
{
        mf_power_off();
}

extern void setup_default_decr(void);

/*
 * void __init iSeries_calibrate_decr()
 *
 * Description:
 *   This routine retrieves the internal processor frequency from the VPD,
 *   and sets up the kernel timer decrementer based on that value.
 *
 */
static void __init iSeries_calibrate_decr(void)
{
        unsigned long   cyclesPerUsec;
        struct div_result divres;

        /* Compute decrementer (and TB) frequency in cycles/sec */
        cyclesPerUsec = ppc_tb_freq / 1000000;

        /*
         * Set the amount to refresh the decrementer by.  This
         * is the number of decrementer ticks it takes for
         * 1/HZ seconds.
         */
        tb_ticks_per_jiffy = ppc_tb_freq / HZ;

#if 0
        /* TEST CODE FOR ADJTIME */
        tb_ticks_per_jiffy += tb_ticks_per_jiffy / 5000;
        /* END OF TEST CODE */
#endif

        /*
         * tb_ticks_per_sec = freq; would give better accuracy
         * but tb_ticks_per_sec = tb_ticks_per_jiffy*HZ; assures
         * that jiffies (and xtime) will match the time returned
         * by do_gettimeofday.
         */
        tb_ticks_per_sec = tb_ticks_per_jiffy * HZ;
        tb_ticks_per_usec = cyclesPerUsec;
        tb_to_us = mulhwu_scale_factor(ppc_tb_freq, 1000000);
        div128_by_32(1024 * 1024, 0, tb_ticks_per_sec, &divres);
        tb_to_xs = divres.result_low;
        setup_default_decr();
}

static void __init iSeries_progress(char * st, unsigned short code)
{
        printk("Progress: [%04x] - %s\n", (unsigned)code, st);
        if (!piranha_simulator && mf_initialized) {
                if (code != 0xffff)
                        mf_display_progress(code);
                else
                        mf_clear_src();
        }
}

static void __init iSeries_fixup_klimit(void)
{
        /*
         * Change klimit to take into account any ram disk
         * that may be included
         */
        if (naca.xRamDisk)
                klimit = KERNELBASE + (u64)naca.xRamDisk +
                        (naca.xRamDiskSize * PAGE_SIZE);
        else {
                /*
                 * No ram disk was included - check and see if there
                 * was an embedded system map.  Change klimit to take
                 * into account any embedded system map
                 */
                if (embedded_sysmap_end)
                        klimit = KERNELBASE + ((embedded_sysmap_end + 4095) &
                                        0xfffffffffffff000);
        }
}

static int __init iSeries_src_init(void)
{
        /* clear the progress line */
        ppc_md.progress(" ", 0xffff);
        return 0;
}

late_initcall(iSeries_src_init);

void __init iSeries_early_setup(void)
{
        iSeries_fixup_klimit();

        ppc_md.setup_arch = iSeries_setup_arch;
        ppc_md.get_cpuinfo = iSeries_get_cpuinfo;
        ppc_md.init_IRQ = iSeries_init_IRQ;
        ppc_md.get_irq = iSeries_get_irq;
        ppc_md.init_early = iSeries_init_early,

        ppc_md.pcibios_fixup  = iSeries_pci_final_fixup;

        ppc_md.restart = iSeries_restart;
        ppc_md.power_off = iSeries_power_off;
        ppc_md.halt = iSeries_halt;

        ppc_md.get_boot_time = iSeries_get_boot_time;
        ppc_md.set_rtc_time = iSeries_set_rtc_time;
        ppc_md.get_rtc_time = iSeries_get_rtc_time;
        ppc_md.calibrate_decr = iSeries_calibrate_decr;
        ppc_md.progress = iSeries_progress;
}