iseries_setup.c

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/*
 *    Copyright (c) 2000 Mike Corrigan <[e-mail]>
 *    Copyright (c) 1999-2000 Grant Erickson <[e-mail]>
 *
 *    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 <[e-mail]>, and Dan Malek
 *      <[e-mail]>.
 *
 *      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.
 */
 
#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/time.h>
#include "iSeries_setup.h"
#include <asm/naca.h>
#include <asm/paca.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>

/* Function Prototypes */
extern void abort(void);
extern void ppcdbg_initialize(void);
extern void iSeries_pcibios_init(void);
extern void tce_init_iSeries(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 build_valid_hpte(unsigned long vsid, unsigned long ea, unsigned long pa,
			     pte_t *ptep, unsigned hpteflags, unsigned bolted);
static void iSeries_setup_dprofile(void);
extern void iSeries_setup_arch(void);
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;

unsigned long dprof_shift;
unsigned long dprof_len;
unsigned int *dprof_buffer;

int piranha_simulator;

int boot_cpuid;

extern char _end[];

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.
 */
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

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;
}

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

	if (cur_cpu_spec->cpu_features & 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;
}

void __init iSeries_init_early(void)
{
	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();

	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 = NULL;

	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;

	hpte_init_iSeries();
	tce_init_iSeries();

	/*
	 * Initialize the table which translate Linux physical addresses to
	 * AS/400 absolute addresses
	 */
	build_iSeries_Memory_Map();
	setup_iSeries_cache_sizes();
	/* Initialize machine-dependency vectors */
#ifdef CONFIG_SMP
	smp_init_iSeries();
#endif
	if (itLpNaca.xPirEnvironMode == 0) 
		piranha_simulator = 1;
}

void __init iSeries_init(unsigned long r3, unsigned long r4, unsigned long r5, 
	   unsigned long r6, unsigned long r7)
{
	char *p, *q;

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

	/* 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;

        if (strstr(cmd_line, "dprofile=")) {
                for (q = cmd_line; (p = strstr(q, "dprofile=")) != 0; ) {
			unsigned long size, new_klimit;

                        q = p + 9;
                        if ((p > cmd_line) && (p[-1] != ' '))
                                continue;
                        dprof_shift = simple_strtoul(q, &q, 0);
			dprof_len = (unsigned long)_etext -
				(unsigned long)_stext;
			dprof_len >>= dprof_shift;
			size = ((dprof_len * sizeof(unsigned int)) +
					(PAGE_SIZE-1)) & PAGE_MASK;
			dprof_buffer = (unsigned int *)((klimit +
						(PAGE_SIZE-1)) & PAGE_MASK);
			new_klimit = ((unsigned long)dprof_buffer) + size;
			lmb_reserve(__pa(klimit), (new_klimit-klimit));
			klimit = new_klimit;
			memset(dprof_buffer, 0, size);
                }
        }

	iSeries_setup_dprofile();

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

/*
 * 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;