srmmu.c 47.7 KB
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/*
 * srmmu.c:  SRMMU specific routines for memory management.
 *
 * Copyright (C) 1995 David S. Miller  (davem@caip.rutgers.edu)
 * Copyright (C) 1995,2002 Pete Zaitcev (zaitcev@yahoo.com)
 * Copyright (C) 1996 Eddie C. Dost    (ecd@skynet.be)
 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 * Copyright (C) 1999,2000 Anton Blanchard (anton@samba.org)
 */

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#include <linux/seq_file.h>
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#include <linux/spinlock.h>
#include <linux/bootmem.h>
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#include <linux/pagemap.h>
#include <linux/vmalloc.h>
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#include <linux/kdebug.h>
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#include <linux/kernel.h>
#include <linux/init.h>
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#include <linux/log2.h>
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#include <linux/gfp.h>
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#include <linux/fs.h>
#include <linux/mm.h>
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#include <asm/mmu_context.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
#include <asm/io-unit.h>
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#include <asm/pgalloc.h>
#include <asm/pgtable.h>
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#include <asm/bitext.h>
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#include <asm/vaddrs.h>
#include <asm/cache.h>
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#include <asm/traps.h>
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#include <asm/oplib.h>
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#include <asm/mbus.h>
#include <asm/page.h>
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#include <asm/asi.h>
#include <asm/msi.h>
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#include <asm/smp.h>
#include <asm/io.h>
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/* Now the cpu specific definitions. */
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#include <asm/turbosparc.h>
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#include <asm/tsunami.h>
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#include <asm/viking.h>
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#include <asm/swift.h>
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#include <asm/leon.h>
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#include <asm/mxcc.h>
#include <asm/ross.h>
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#include "srmmu.h"

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enum mbus_module srmmu_modtype;
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static unsigned int hwbug_bitmask;
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int vac_cache_size;
int vac_line_size;

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struct ctx_list *ctx_list_pool;
struct ctx_list ctx_free;
struct ctx_list ctx_used;

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extern struct resource sparc_iomap;

extern unsigned long last_valid_pfn;

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static pgd_t *srmmu_swapper_pg_dir;
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const struct sparc32_cachetlb_ops *sparc32_cachetlb_ops;

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#ifdef CONFIG_SMP
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const struct sparc32_cachetlb_ops *local_ops;

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#define FLUSH_BEGIN(mm)
#define FLUSH_END
#else
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#define FLUSH_BEGIN(mm) if ((mm)->context != NO_CONTEXT) {
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#define FLUSH_END	}
#endif

int flush_page_for_dma_global = 1;

char *srmmu_name;

ctxd_t *srmmu_ctx_table_phys;
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static ctxd_t *srmmu_context_table;
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int viking_mxcc_present;
static DEFINE_SPINLOCK(srmmu_context_spinlock);

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static int is_hypersparc;
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static int srmmu_cache_pagetables;
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/* these will be initialized in srmmu_nocache_calcsize() */
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static unsigned long srmmu_nocache_size;
static unsigned long srmmu_nocache_end;
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/* 1 bit <=> 256 bytes of nocache <=> 64 PTEs */
#define SRMMU_NOCACHE_BITMAP_SHIFT (PAGE_SHIFT - 4)

/* The context table is a nocache user with the biggest alignment needs. */
#define SRMMU_NOCACHE_ALIGN_MAX (sizeof(ctxd_t)*SRMMU_MAX_CONTEXTS)

void *srmmu_nocache_pool;
void *srmmu_nocache_bitmap;
static struct bit_map srmmu_nocache_map;

static inline int srmmu_pmd_none(pmd_t pmd)
{ return !(pmd_val(pmd) & 0xFFFFFFF); }

/* XXX should we hyper_flush_whole_icache here - Anton */
static inline void srmmu_ctxd_set(ctxd_t *ctxp, pgd_t *pgdp)
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{ set_pte((pte_t *)ctxp, (SRMMU_ET_PTD | (__nocache_pa((unsigned long) pgdp) >> 4))); }
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void pmd_set(pmd_t *pmdp, pte_t *ptep)
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{
	unsigned long ptp;	/* Physical address, shifted right by 4 */
	int i;

	ptp = __nocache_pa((unsigned long) ptep) >> 4;
	for (i = 0; i < PTRS_PER_PTE/SRMMU_REAL_PTRS_PER_PTE; i++) {
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		set_pte((pte_t *)&pmdp->pmdv[i], SRMMU_ET_PTD | ptp);
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		ptp += (SRMMU_REAL_PTRS_PER_PTE*sizeof(pte_t) >> 4);
	}
}

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void pmd_populate(struct mm_struct *mm, pmd_t *pmdp, struct page *ptep)
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{
	unsigned long ptp;	/* Physical address, shifted right by 4 */
	int i;

	ptp = page_to_pfn(ptep) << (PAGE_SHIFT-4);	/* watch for overflow */
	for (i = 0; i < PTRS_PER_PTE/SRMMU_REAL_PTRS_PER_PTE; i++) {
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		set_pte((pte_t *)&pmdp->pmdv[i], SRMMU_ET_PTD | ptp);
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		ptp += (SRMMU_REAL_PTRS_PER_PTE*sizeof(pte_t) >> 4);
	}
}

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/* Find an entry in the third-level page table.. */
pte_t *pte_offset_kernel(pmd_t *dir, unsigned long address)
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{
	void *pte;

	pte = __nocache_va((dir->pmdv[0] & SRMMU_PTD_PMASK) << 4);
	return (pte_t *) pte +
	    ((address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1));
}

/*
 * size: bytes to allocate in the nocache area.
 * align: bytes, number to align at.
 * Returns the virtual address of the allocated area.
 */
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static void *__srmmu_get_nocache(int size, int align)
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{
	int offset;
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	unsigned long addr;
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	if (size < SRMMU_NOCACHE_BITMAP_SHIFT) {
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		printk(KERN_ERR "Size 0x%x too small for nocache request\n",
		       size);
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		size = SRMMU_NOCACHE_BITMAP_SHIFT;
	}
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	if (size & (SRMMU_NOCACHE_BITMAP_SHIFT - 1)) {
		printk(KERN_ERR "Size 0x%x unaligned int nocache request\n",
		       size);
		size += SRMMU_NOCACHE_BITMAP_SHIFT - 1;
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	}
	BUG_ON(align > SRMMU_NOCACHE_ALIGN_MAX);

	offset = bit_map_string_get(&srmmu_nocache_map,
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				    size >> SRMMU_NOCACHE_BITMAP_SHIFT,
				    align >> SRMMU_NOCACHE_BITMAP_SHIFT);
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	if (offset == -1) {
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		printk(KERN_ERR "srmmu: out of nocache %d: %d/%d\n",
		       size, (int) srmmu_nocache_size,
		       srmmu_nocache_map.used << SRMMU_NOCACHE_BITMAP_SHIFT);
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		return 0;
	}

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	addr = SRMMU_NOCACHE_VADDR + (offset << SRMMU_NOCACHE_BITMAP_SHIFT);
	return (void *)addr;
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}

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void *srmmu_get_nocache(int size, int align)
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{
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	void *tmp;
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	tmp = __srmmu_get_nocache(size, align);

	if (tmp)
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		memset(tmp, 0, size);
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	return tmp;
}

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void srmmu_free_nocache(void *addr, int size)
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{
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	unsigned long vaddr;
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	int offset;

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	vaddr = (unsigned long)addr;
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	if (vaddr < SRMMU_NOCACHE_VADDR) {
		printk("Vaddr %lx is smaller than nocache base 0x%lx\n",
		    vaddr, (unsigned long)SRMMU_NOCACHE_VADDR);
		BUG();
	}
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	if (vaddr + size > srmmu_nocache_end) {
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		printk("Vaddr %lx is bigger than nocache end 0x%lx\n",
		    vaddr, srmmu_nocache_end);
		BUG();
	}
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	if (!is_power_of_2(size)) {
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		printk("Size 0x%x is not a power of 2\n", size);
		BUG();
	}
	if (size < SRMMU_NOCACHE_BITMAP_SHIFT) {
		printk("Size 0x%x is too small\n", size);
		BUG();
	}
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	if (vaddr & (size - 1)) {
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		printk("Vaddr %lx is not aligned to size 0x%x\n", vaddr, size);
		BUG();
	}

	offset = (vaddr - SRMMU_NOCACHE_VADDR) >> SRMMU_NOCACHE_BITMAP_SHIFT;
	size = size >> SRMMU_NOCACHE_BITMAP_SHIFT;

	bit_map_clear(&srmmu_nocache_map, offset, size);
}

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static void srmmu_early_allocate_ptable_skeleton(unsigned long start,
						 unsigned long end);
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extern unsigned long probe_memory(void);	/* in fault.c */

/*
 * Reserve nocache dynamically proportionally to the amount of
 * system RAM. -- Tomas Szepe <szepe@pinerecords.com>, June 2002
 */
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static void __init srmmu_nocache_calcsize(void)
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{
	unsigned long sysmemavail = probe_memory() / 1024;
	int srmmu_nocache_npages;

	srmmu_nocache_npages =
		sysmemavail / SRMMU_NOCACHE_ALCRATIO / 1024 * 256;

 /* P3 XXX The 4x overuse: corroborated by /proc/meminfo. */
	// if (srmmu_nocache_npages < 256) srmmu_nocache_npages = 256;
	if (srmmu_nocache_npages < SRMMU_MIN_NOCACHE_PAGES)
		srmmu_nocache_npages = SRMMU_MIN_NOCACHE_PAGES;

	/* anything above 1280 blows up */
	if (srmmu_nocache_npages > SRMMU_MAX_NOCACHE_PAGES)
		srmmu_nocache_npages = SRMMU_MAX_NOCACHE_PAGES;

	srmmu_nocache_size = srmmu_nocache_npages * PAGE_SIZE;
	srmmu_nocache_end = SRMMU_NOCACHE_VADDR + srmmu_nocache_size;
}

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static void __init srmmu_nocache_init(void)
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{
	unsigned int bitmap_bits;
	pgd_t *pgd;
	pmd_t *pmd;
	pte_t *pte;
	unsigned long paddr, vaddr;
	unsigned long pteval;

	bitmap_bits = srmmu_nocache_size >> SRMMU_NOCACHE_BITMAP_SHIFT;

	srmmu_nocache_pool = __alloc_bootmem(srmmu_nocache_size,
		SRMMU_NOCACHE_ALIGN_MAX, 0UL);
	memset(srmmu_nocache_pool, 0, srmmu_nocache_size);

	srmmu_nocache_bitmap = __alloc_bootmem(bitmap_bits >> 3, SMP_CACHE_BYTES, 0UL);
	bit_map_init(&srmmu_nocache_map, srmmu_nocache_bitmap, bitmap_bits);

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	srmmu_swapper_pg_dir = __srmmu_get_nocache(SRMMU_PGD_TABLE_SIZE, SRMMU_PGD_TABLE_SIZE);
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	memset(__nocache_fix(srmmu_swapper_pg_dir), 0, SRMMU_PGD_TABLE_SIZE);
	init_mm.pgd = srmmu_swapper_pg_dir;

	srmmu_early_allocate_ptable_skeleton(SRMMU_NOCACHE_VADDR, srmmu_nocache_end);

	paddr = __pa((unsigned long)srmmu_nocache_pool);
	vaddr = SRMMU_NOCACHE_VADDR;

	while (vaddr < srmmu_nocache_end) {
		pgd = pgd_offset_k(vaddr);
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		pmd = pmd_offset(__nocache_fix(pgd), vaddr);
		pte = pte_offset_kernel(__nocache_fix(pmd), vaddr);
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		pteval = ((paddr >> 4) | SRMMU_ET_PTE | SRMMU_PRIV);

		if (srmmu_cache_pagetables)
			pteval |= SRMMU_CACHE;

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		set_pte(__nocache_fix(pte), __pte(pteval));
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		vaddr += PAGE_SIZE;
		paddr += PAGE_SIZE;
	}

	flush_cache_all();
	flush_tlb_all();
}

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pgd_t *get_pgd_fast(void)
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{
	pgd_t *pgd = NULL;

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	pgd = __srmmu_get_nocache(SRMMU_PGD_TABLE_SIZE, SRMMU_PGD_TABLE_SIZE);
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	if (pgd) {
		pgd_t *init = pgd_offset_k(0);
		memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
		memcpy(pgd + USER_PTRS_PER_PGD, init + USER_PTRS_PER_PGD,
						(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
	}

	return pgd;
}

/*
 * Hardware needs alignment to 256 only, but we align to whole page size
 * to reduce fragmentation problems due to the buddy principle.
 * XXX Provide actual fragmentation statistics in /proc.
 *
 * Alignments up to the page size are the same for physical and virtual
 * addresses of the nocache area.
 */
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pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
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{
	unsigned long pte;
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	struct page *page;
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	if ((pte = (unsigned long)pte_alloc_one_kernel(mm, address)) == 0)
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		return NULL;
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	page = pfn_to_page(__nocache_pa(pte) >> PAGE_SHIFT);
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	pgtable_page_ctor(page);
	return page;
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}

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void pte_free(struct mm_struct *mm, pgtable_t pte)
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{
	unsigned long p;

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	pgtable_page_dtor(pte);
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	p = (unsigned long)page_address(pte);	/* Cached address (for test) */
	if (p == 0)
		BUG();
	p = page_to_pfn(pte) << PAGE_SHIFT;	/* Physical address */
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	/* free non cached virtual address*/
	srmmu_free_nocache(__nocache_va(p), PTE_SIZE);
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}

/*
 */
static inline void alloc_context(struct mm_struct *old_mm, struct mm_struct *mm)
{
	struct ctx_list *ctxp;

	ctxp = ctx_free.next;
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	if (ctxp != &ctx_free) {
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		remove_from_ctx_list(ctxp);
		add_to_used_ctxlist(ctxp);
		mm->context = ctxp->ctx_number;
		ctxp->ctx_mm = mm;
		return;
	}
	ctxp = ctx_used.next;
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	if (ctxp->ctx_mm == old_mm)
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		ctxp = ctxp->next;
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	if (ctxp == &ctx_used)
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		panic("out of mmu contexts");
	flush_cache_mm(ctxp->ctx_mm);
	flush_tlb_mm(ctxp->ctx_mm);
	remove_from_ctx_list(ctxp);
	add_to_used_ctxlist(ctxp);
	ctxp->ctx_mm->context = NO_CONTEXT;
	ctxp->ctx_mm = mm;
	mm->context = ctxp->ctx_number;
}

static inline void free_context(int context)
{
	struct ctx_list *ctx_old;

	ctx_old = ctx_list_pool + context;
	remove_from_ctx_list(ctx_old);
	add_to_free_ctxlist(ctx_old);
}


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void switch_mm(struct mm_struct *old_mm, struct mm_struct *mm,
	       struct task_struct *tsk)
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{
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	if (mm->context == NO_CONTEXT) {
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		spin_lock(&srmmu_context_spinlock);
		alloc_context(old_mm, mm);
		spin_unlock(&srmmu_context_spinlock);
		srmmu_ctxd_set(&srmmu_context_table[mm->context], mm->pgd);
	}

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	if (sparc_cpu_model == sparc_leon)
		leon_switch_mm();

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	if (is_hypersparc)
		hyper_flush_whole_icache();

	srmmu_set_context(mm->context);
}

/* Low level IO area allocation on the SRMMU. */
static inline void srmmu_mapioaddr(unsigned long physaddr,
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				   unsigned long virt_addr, int bus_type)
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{
	pgd_t *pgdp;
	pmd_t *pmdp;
	pte_t *ptep;
	unsigned long tmp;

	physaddr &= PAGE_MASK;
	pgdp = pgd_offset_k(virt_addr);
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	pmdp = pmd_offset(pgdp, virt_addr);
	ptep = pte_offset_kernel(pmdp, virt_addr);
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	tmp = (physaddr >> 4) | SRMMU_ET_PTE;

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	/* I need to test whether this is consistent over all
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	 * sun4m's.  The bus_type represents the upper 4 bits of
	 * 36-bit physical address on the I/O space lines...
	 */
	tmp |= (bus_type << 28);
	tmp |= SRMMU_PRIV;
	__flush_page_to_ram(virt_addr);
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	set_pte(ptep, __pte(tmp));
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}

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void srmmu_mapiorange(unsigned int bus, unsigned long xpa,
		      unsigned long xva, unsigned int len)
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{
	while (len != 0) {
		len -= PAGE_SIZE;
		srmmu_mapioaddr(xpa, xva, bus);
		xva += PAGE_SIZE;
		xpa += PAGE_SIZE;
	}
	flush_tlb_all();
}

static inline void srmmu_unmapioaddr(unsigned long virt_addr)
{
	pgd_t *pgdp;
	pmd_t *pmdp;
	pte_t *ptep;

	pgdp = pgd_offset_k(virt_addr);
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	pmdp = pmd_offset(pgdp, virt_addr);
	ptep = pte_offset_kernel(pmdp, virt_addr);
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	/* No need to flush uncacheable page. */
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	__pte_clear(ptep);
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}

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void srmmu_unmapiorange(unsigned long virt_addr, unsigned int len)
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{
	while (len != 0) {
		len -= PAGE_SIZE;
		srmmu_unmapioaddr(virt_addr);
		virt_addr += PAGE_SIZE;
	}
	flush_tlb_all();
}

/* tsunami.S */
extern void tsunami_flush_cache_all(void);
extern void tsunami_flush_cache_mm(struct mm_struct *mm);
extern void tsunami_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end);
extern void tsunami_flush_cache_page(struct vm_area_struct *vma, unsigned long page);
extern void tsunami_flush_page_to_ram(unsigned long page);
extern void tsunami_flush_page_for_dma(unsigned long page);
extern void tsunami_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr);
extern void tsunami_flush_tlb_all(void);
extern void tsunami_flush_tlb_mm(struct mm_struct *mm);
extern void tsunami_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end);
extern void tsunami_flush_tlb_page(struct vm_area_struct *vma, unsigned long page);
extern void tsunami_setup_blockops(void);

/* swift.S */
extern void swift_flush_cache_all(void);
extern void swift_flush_cache_mm(struct mm_struct *mm);
extern void swift_flush_cache_range(struct vm_area_struct *vma,
				    unsigned long start, unsigned long end);
extern void swift_flush_cache_page(struct vm_area_struct *vma, unsigned long page);
extern void swift_flush_page_to_ram(unsigned long page);
extern void swift_flush_page_for_dma(unsigned long page);
extern void swift_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr);
extern void swift_flush_tlb_all(void);
extern void swift_flush_tlb_mm(struct mm_struct *mm);
extern void swift_flush_tlb_range(struct vm_area_struct *vma,
				  unsigned long start, unsigned long end);
extern void swift_flush_tlb_page(struct vm_area_struct *vma, unsigned long page);

#if 0  /* P3: deadwood to debug precise flushes on Swift. */
void swift_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
{
	int cctx, ctx1;

	page &= PAGE_MASK;
	if ((ctx1 = vma->vm_mm->context) != -1) {
		cctx = srmmu_get_context();
/* Is context # ever different from current context? P3 */
		if (cctx != ctx1) {
			printk("flush ctx %02x curr %02x\n", ctx1, cctx);
			srmmu_set_context(ctx1);
			swift_flush_page(page);
			__asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
					"r" (page), "i" (ASI_M_FLUSH_PROBE));
			srmmu_set_context(cctx);
		} else {
			 /* Rm. prot. bits from virt. c. */
			/* swift_flush_cache_all(); */
			/* swift_flush_cache_page(vma, page); */
			swift_flush_page(page);

			__asm__ __volatile__("sta %%g0, [%0] %1\n\t" : :
				"r" (page), "i" (ASI_M_FLUSH_PROBE));
			/* same as above: srmmu_flush_tlb_page() */
		}
	}
}
#endif

/*
 * The following are all MBUS based SRMMU modules, and therefore could
 * be found in a multiprocessor configuration.  On the whole, these
 * chips seems to be much more touchy about DVMA and page tables
 * with respect to cache coherency.
 */

/* viking.S */
extern void viking_flush_cache_all(void);
extern void viking_flush_cache_mm(struct mm_struct *mm);
extern void viking_flush_cache_range(struct vm_area_struct *vma, unsigned long start,
				     unsigned long end);
extern void viking_flush_cache_page(struct vm_area_struct *vma, unsigned long page);
extern void viking_flush_page_to_ram(unsigned long page);
extern void viking_flush_page_for_dma(unsigned long page);
extern void viking_flush_sig_insns(struct mm_struct *mm, unsigned long addr);
extern void viking_flush_page(unsigned long page);
extern void viking_mxcc_flush_page(unsigned long page);
extern void viking_flush_tlb_all(void);
extern void viking_flush_tlb_mm(struct mm_struct *mm);
extern void viking_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
				   unsigned long end);
extern void viking_flush_tlb_page(struct vm_area_struct *vma,
				  unsigned long page);
extern void sun4dsmp_flush_tlb_all(void);
extern void sun4dsmp_flush_tlb_mm(struct mm_struct *mm);
extern void sun4dsmp_flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
				   unsigned long end);
extern void sun4dsmp_flush_tlb_page(struct vm_area_struct *vma,
				  unsigned long page);

/* hypersparc.S */
extern void hypersparc_flush_cache_all(void);
extern void hypersparc_flush_cache_mm(struct mm_struct *mm);
extern void hypersparc_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end);
extern void hypersparc_flush_cache_page(struct vm_area_struct *vma, unsigned long page);
extern void hypersparc_flush_page_to_ram(unsigned long page);
extern void hypersparc_flush_page_for_dma(unsigned long page);
extern void hypersparc_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr);
extern void hypersparc_flush_tlb_all(void);
extern void hypersparc_flush_tlb_mm(struct mm_struct *mm);
extern void hypersparc_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end);
extern void hypersparc_flush_tlb_page(struct vm_area_struct *vma, unsigned long page);
extern void hypersparc_setup_blockops(void);

/*
 * NOTE: All of this startup code assumes the low 16mb (approx.) of
 *       kernel mappings are done with one single contiguous chunk of
 *       ram.  On small ram machines (classics mainly) we only get
 *       around 8mb mapped for us.
 */

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static void __init early_pgtable_allocfail(char *type)
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{
	prom_printf("inherit_prom_mappings: Cannot alloc kernel %s.\n", type);
	prom_halt();
}

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static void __init srmmu_early_allocate_ptable_skeleton(unsigned long start,
							unsigned long end)
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{
	pgd_t *pgdp;
	pmd_t *pmdp;
	pte_t *ptep;

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	while (start < end) {
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		pgdp = pgd_offset_k(start);
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		if (pgd_none(*(pgd_t *)__nocache_fix(pgdp))) {
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			pmdp = __srmmu_get_nocache(
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			    SRMMU_PMD_TABLE_SIZE, SRMMU_PMD_TABLE_SIZE);
			if (pmdp == NULL)
				early_pgtable_allocfail("pmd");
			memset(__nocache_fix(pmdp), 0, SRMMU_PMD_TABLE_SIZE);
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			pgd_set(__nocache_fix(pgdp), pmdp);
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		}
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		pmdp = pmd_offset(__nocache_fix(pgdp), start);
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		if (srmmu_pmd_none(*(pmd_t *)__nocache_fix(pmdp))) {
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			ptep = __srmmu_get_nocache(PTE_SIZE, PTE_SIZE);
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			if (ptep == NULL)
				early_pgtable_allocfail("pte");
			memset(__nocache_fix(ptep), 0, PTE_SIZE);
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			pmd_set(__nocache_fix(pmdp), ptep);
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		}
		if (start > (0xffffffffUL - PMD_SIZE))
			break;
		start = (start + PMD_SIZE) & PMD_MASK;
	}
}

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static void __init srmmu_allocate_ptable_skeleton(unsigned long start,
						  unsigned long end)
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{
	pgd_t *pgdp;
	pmd_t *pmdp;
	pte_t *ptep;

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	while (start < end) {
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		pgdp = pgd_offset_k(start);
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		if (pgd_none(*pgdp)) {
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			pmdp = __srmmu_get_nocache(SRMMU_PMD_TABLE_SIZE, SRMMU_PMD_TABLE_SIZE);
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			if (pmdp == NULL)
				early_pgtable_allocfail("pmd");
			memset(pmdp, 0, SRMMU_PMD_TABLE_SIZE);
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			pgd_set(pgdp, pmdp);
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		}
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		pmdp = pmd_offset(pgdp, start);
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		if (srmmu_pmd_none(*pmdp)) {
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			ptep = __srmmu_get_nocache(PTE_SIZE,
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							     PTE_SIZE);
			if (ptep == NULL)
				early_pgtable_allocfail("pte");
			memset(ptep, 0, PTE_SIZE);
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			pmd_set(pmdp, ptep);
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		}
		if (start > (0xffffffffUL - PMD_SIZE))
			break;
		start = (start + PMD_SIZE) & PMD_MASK;
	}
}

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/* These flush types are not available on all chips... */
static inline unsigned long srmmu_probe(unsigned long vaddr)
{
	unsigned long retval;

	if (sparc_cpu_model != sparc_leon) {

		vaddr &= PAGE_MASK;
		__asm__ __volatile__("lda [%1] %2, %0\n\t" :
				     "=r" (retval) :
				     "r" (vaddr | 0x400), "i" (ASI_M_FLUSH_PROBE));
	} else {
		retval = leon_swprobe(vaddr, 0);
	}
	return retval;
}

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/*
 * This is much cleaner than poking around physical address space
 * looking at the prom's page table directly which is what most
 * other OS's do.  Yuck... this is much better.
 */
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static void __init srmmu_inherit_prom_mappings(unsigned long start,
					       unsigned long end)
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{
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	unsigned long probed;
	unsigned long addr;
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	pgd_t *pgdp;
	pmd_t *pmdp;
	pte_t *ptep;
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	int what; /* 0 = normal-pte, 1 = pmd-level pte, 2 = pgd-level pte */
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	while (start <= end) {
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		if (start == 0)
			break; /* probably wrap around */
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		if (start == 0xfef00000)
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			start = KADB_DEBUGGER_BEGVM;
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		probed = srmmu_probe(start);
		if (!probed) {
			/* continue probing until we find an entry */
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			start += PAGE_SIZE;
			continue;
		}
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		/* A red snapper, see what it really is. */
		what = 0;
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		addr = start - PAGE_SIZE;
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		if (!(start & ~(SRMMU_REAL_PMD_MASK))) {
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			if (srmmu_probe(addr + SRMMU_REAL_PMD_SIZE) == probed)
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				what = 1;
		}
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		if (!(start & ~(SRMMU_PGDIR_MASK))) {
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			if (srmmu_probe(addr + SRMMU_PGDIR_SIZE) == probed)
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				what = 2;
		}
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		pgdp = pgd_offset_k(start);
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		if (what == 2) {
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			*(pgd_t *)__nocache_fix(pgdp) = __pgd(probed);
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			start += SRMMU_PGDIR_SIZE;
			continue;
		}
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		if (pgd_none(*(pgd_t *)__nocache_fix(pgdp))) {
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			pmdp = __srmmu_get_nocache(SRMMU_PMD_TABLE_SIZE,
						   SRMMU_PMD_TABLE_SIZE);
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			if (pmdp == NULL)
				early_pgtable_allocfail("pmd");
			memset(__nocache_fix(pmdp), 0, SRMMU_PMD_TABLE_SIZE);
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			pgd_set(__nocache_fix(pgdp), pmdp);
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		}
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		pmdp = pmd_offset(__nocache_fix(pgdp), start);
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		if (srmmu_pmd_none(*(pmd_t *)__nocache_fix(pmdp))) {
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			ptep = __srmmu_get_nocache(PTE_SIZE, PTE_SIZE);
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			if (ptep == NULL)
				early_pgtable_allocfail("pte");
			memset(__nocache_fix(ptep), 0, PTE_SIZE);
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			pmd_set(__nocache_fix(pmdp), ptep);
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		}
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		if (what == 1) {
			/* We bend the rule where all 16 PTPs in a pmd_t point
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			 * inside the same PTE page, and we leak a perfectly
			 * good hardware PTE piece. Alternatives seem worse.
			 */
			unsigned int x;	/* Index of HW PMD in soft cluster */
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			unsigned long *val;
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			x = (start >> PMD_SHIFT) & 15;
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			val = &pmdp->pmdv[x];
			*(unsigned long *)__nocache_fix(val) = probed;
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			start += SRMMU_REAL_PMD_SIZE;
			continue;
		}
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		ptep = pte_offset_kernel(__nocache_fix(pmdp), start);
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		*(pte_t *)__nocache_fix(ptep) = __pte(probed);
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		start += PAGE_SIZE;
	}
}

#define KERNEL_PTE(page_shifted) ((page_shifted)|SRMMU_CACHE|SRMMU_PRIV|SRMMU_VALID)

/* Create a third-level SRMMU 16MB page mapping. */
static void __init do_large_mapping(unsigned long vaddr, unsigned long phys_base)
{
	pgd_t *pgdp = pgd_offset_k(vaddr);
	unsigned long big_pte;

	big_pte = KERNEL_PTE(phys_base >> 4);
	*(pgd_t *)__nocache_fix(pgdp) = __pgd(big_pte);
}

/* Map sp_bank entry SP_ENTRY, starting at virtual address VBASE. */
static unsigned long __init map_spbank(unsigned long vbase, int sp_entry)
{
	unsigned long pstart = (sp_banks[sp_entry].base_addr & SRMMU_PGDIR_MASK);
	unsigned long vstart = (vbase & SRMMU_PGDIR_MASK);
	unsigned long vend = SRMMU_PGDIR_ALIGN(vbase + sp_banks[sp_entry].num_bytes);
	/* Map "low" memory only */
	const unsigned long min_vaddr = PAGE_OFFSET;
	const unsigned long max_vaddr = PAGE_OFFSET + SRMMU_MAXMEM;

	if (vstart < min_vaddr || vstart >= max_vaddr)
		return vstart;
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	if (vend > max_vaddr || vend < min_vaddr)
		vend = max_vaddr;

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	while (vstart < vend) {
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		do_large_mapping(vstart, pstart);
		vstart += SRMMU_PGDIR_SIZE; pstart += SRMMU_PGDIR_SIZE;
	}
	return vstart;
}

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static void __init map_kernel(void)
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{
	int i;

	if (phys_base > 0) {
		do_large_mapping(PAGE_OFFSET, phys_base);
	}

	for (i = 0; sp_banks[i].num_bytes != 0; i++) {
		map_spbank((unsigned long)__va(sp_banks[i].base_addr), i);
	}
}

/* Paging initialization on the Sparc Reference MMU. */
extern void sparc_context_init(int);

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void (*poke_srmmu)(void) __cpuinitdata = NULL;
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extern unsigned long bootmem_init(unsigned long *pages_avail);

void __init srmmu_paging_init(void)
{
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	int i;
	phandle cpunode;
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	char node_str[128];
	pgd_t *pgd;
	pmd_t *pmd;
	pte_t *pte;
	unsigned long pages_avail;

	sparc_iomap.start = SUN4M_IOBASE_VADDR;	/* 16MB of IOSPACE on all sun4m's. */

	if (sparc_cpu_model == sun4d)
		num_contexts = 65536; /* We know it is Viking */
	else {
		/* Find the number of contexts on the srmmu. */
		cpunode = prom_getchild(prom_root_node);
		num_contexts = 0;
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		while (cpunode != 0) {
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			prom_getstring(cpunode, "device_type", node_str, sizeof(node_str));
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			if (!strcmp(node_str, "cpu")) {
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				num_contexts = prom_getintdefault(cpunode, "mmu-nctx", 0x8);
				break;
			}
			cpunode = prom_getsibling(cpunode);
		}
	}

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	if (!num_contexts) {
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		prom_printf("Something wrong, can't find cpu node in paging_init.\n");
		prom_halt();
	}

	pages_avail = 0;
	last_valid_pfn = bootmem_init(&pages_avail);

	srmmu_nocache_calcsize();
	srmmu_nocache_init();
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	srmmu_inherit_prom_mappings(0xfe400000, (LINUX_OPPROM_ENDVM - PAGE_SIZE));
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	map_kernel();

	/* ctx table has to be physically aligned to its size */
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	srmmu_context_table = __srmmu_get_nocache(num_contexts * sizeof(ctxd_t), num_contexts * sizeof(ctxd_t));
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	srmmu_ctx_table_phys = (ctxd_t *)__nocache_pa((unsigned long)srmmu_context_table);

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	for (i = 0; i < num_contexts; i++)
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		srmmu_ctxd_set((ctxd_t *)__nocache_fix(&srmmu_context_table[i]), srmmu_swapper_pg_dir);

	flush_cache_all();
	srmmu_set_ctable_ptr((unsigned long)srmmu_ctx_table_phys);
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#ifdef CONFIG_SMP
	/* Stop from hanging here... */
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	local_ops->tlb_all();
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#else
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	flush_tlb_all();
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#endif
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	poke_srmmu();

	srmmu_allocate_ptable_skeleton(sparc_iomap.start, IOBASE_END);
	srmmu_allocate_ptable_skeleton(DVMA_VADDR, DVMA_END);

	srmmu_allocate_ptable_skeleton(
		__fix_to_virt(__end_of_fixed_addresses - 1), FIXADDR_TOP);
	srmmu_allocate_ptable_skeleton(PKMAP_BASE, PKMAP_END);

	pgd = pgd_offset_k(PKMAP_BASE);
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	pmd = pmd_offset(pgd, PKMAP_BASE);
	pte = pte_offset_kernel(pmd, PKMAP_BASE);
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	pkmap_page_table = pte;

	flush_cache_all();
	flush_tlb_all();

	sparc_context_init(num_contexts);

	kmap_init();

	{
		unsigned long zones_size[MAX_NR_ZONES];
		unsigned long zholes_size[MAX_NR_ZONES];
		unsigned long npages;
		int znum;

		for (znum = 0; znum < MAX_NR_ZONES; znum++)
			zones_size[znum] = zholes_size[znum] = 0;

		npages = max_low_pfn - pfn_base;

		zones_size[ZONE_DMA] = npages;
		zholes_size[ZONE_DMA] = npages - pages_avail;

		npages = highend_pfn - max_low_pfn;
		zones_size[ZONE_HIGHMEM] = npages;
		zholes_size[ZONE_HIGHMEM] = npages - calc_highpages();

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		free_area_init_node(0, zones_size, pfn_base, zholes_size);
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	}
}

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void mmu_info(struct seq_file *m)
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{
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	seq_printf(m,
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		   "MMU type\t: %s\n"
		   "contexts\t: %d\n"
		   "nocache total\t: %ld\n"
		   "nocache used\t: %d\n",
		   srmmu_name,
		   num_contexts,
		   srmmu_nocache_size,
		   srmmu_nocache_map.used << SRMMU_NOCACHE_BITMAP_SHIFT);
}

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void destroy_context(struct mm_struct *mm)
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{

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	if (mm->context != NO_CONTEXT) {
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		flush_cache_mm(mm);
		srmmu_ctxd_set(&srmmu_context_table[mm->context], srmmu_swapper_pg_dir);
		flush_tlb_mm(mm);
		spin_lock(&srmmu_context_spinlock);
		free_context(mm->context);
		spin_unlock(&srmmu_context_spinlock);
		mm->context = NO_CONTEXT;
	}
}

/* Init various srmmu chip types. */
static void __init srmmu_is_bad(void)
{
	prom_printf("Could not determine SRMMU chip type.\n");
	prom_halt();
}

static void __init init_vac_layout(void)
{
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	phandle nd;
	int cache_lines;
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	char node_str[128];
#ifdef CONFIG_SMP
	int cpu = 0;
	unsigned long max_size = 0;
	unsigned long min_line_size = 0x10000000;
#endif

	nd = prom_getchild(prom_root_node);
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	while ((nd = prom_getsibling(nd)) != 0) {
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		prom_getstring(nd, "device_type", node_str, sizeof(node_str));
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		if (!strcmp(node_str, "cpu")) {
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			vac_line_size = prom_getint(nd, "cache-line-size");
			if (vac_line_size == -1) {
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				prom_printf("can't determine cache-line-size, halting.\n");
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				prom_halt();
			}
			cache_lines = prom_getint(nd, "cache-nlines");
			if (cache_lines == -1) {
				prom_printf("can't determine cache-nlines, halting.\n");
				prom_halt();
			}

			vac_cache_size = cache_lines * vac_line_size;
#ifdef CONFIG_SMP
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			if (vac_cache_size > max_size)
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				max_size = vac_cache_size;
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			if (vac_line_size < min_line_size)
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				min_line_size = vac_line_size;
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			//FIXME: cpus not contiguous!!
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			cpu++;
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			if (cpu >= nr_cpu_ids || !cpu_online(cpu))
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				break;
#else
			break;
#endif
		}
	}
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	if (nd == 0) {
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		prom_printf("No CPU nodes found, halting.\n");
		prom_halt();
	}
#ifdef CONFIG_SMP
	vac_cache_size = max_size;
	vac_line_size = min_line_size;
#endif
	printk("SRMMU: Using VAC size of %d bytes, line size %d bytes.\n",
	       (int)vac_cache_size, (int)vac_line_size);
}

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static void __cpuinit poke_hypersparc(void)
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{
	volatile unsigned long clear;
	unsigned long mreg = srmmu_get_mmureg();

	hyper_flush_unconditional_combined();

	mreg &= ~(HYPERSPARC_CWENABLE);
	mreg |= (HYPERSPARC_CENABLE | HYPERSPARC_WBENABLE);
	mreg |= (HYPERSPARC_CMODE);

	srmmu_set_mmureg(mreg);

#if 0 /* XXX I think this is bad news... -DaveM */
	hyper_clear_all_tags();
#endif

	put_ross_icr(HYPERSPARC_ICCR_FTD | HYPERSPARC_ICCR_ICE);
	hyper_flush_whole_icache();
	clear = srmmu_get_faddr();
	clear = srmmu_get_fstatus();
}

1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031
static const struct sparc32_cachetlb_ops hypersparc_ops = {
	.cache_all	= hypersparc_flush_cache_all,
	.cache_mm	= hypersparc_flush_cache_mm,
	.cache_page	= hypersparc_flush_cache_page,
	.cache_range	= hypersparc_flush_cache_range,
	.tlb_all	= hypersparc_flush_tlb_all,
	.tlb_mm		= hypersparc_flush_tlb_mm,
	.tlb_page	= hypersparc_flush_tlb_page,
	.tlb_range	= hypersparc_flush_tlb_range,
	.page_to_ram	= hypersparc_flush_page_to_ram,
	.sig_insns	= hypersparc_flush_sig_insns,
	.page_for_dma	= hypersparc_flush_page_for_dma,
};

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static void __init init_hypersparc(void)
{
	srmmu_name = "ROSS HyperSparc";
	srmmu_modtype = HyperSparc;

	init_vac_layout();

	is_hypersparc = 1;
1040
	sparc32_cachetlb_ops = &hypersparc_ops;
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	poke_srmmu = poke_hypersparc;

	hypersparc_setup_blockops();
}

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static void __cpuinit poke_swift(void)
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{
	unsigned long mreg;

	/* Clear any crap from the cache or else... */
	swift_flush_cache_all();

	/* Enable I & D caches */
	mreg = srmmu_get_mmureg();
	mreg |= (SWIFT_IE | SWIFT_DE);
	/*
	 * The Swift branch folding logic is completely broken.  At
	 * trap time, if things are just right, if can mistakenly
	 * think that a trap is coming from kernel mode when in fact
	 * it is coming from user mode (it mis-executes the branch in
	 * the trap code).  So you see things like crashme completely
	 * hosing your machine which is completely unacceptable.  Turn
	 * this shit off... nice job Fujitsu.
	 */
	mreg &= ~(SWIFT_BF);
	srmmu_set_mmureg(mreg);
}

1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083
static const struct sparc32_cachetlb_ops swift_ops = {
	.cache_all	= swift_flush_cache_all,
	.cache_mm	= swift_flush_cache_mm,
	.cache_page	= swift_flush_cache_page,
	.cache_range	= swift_flush_cache_range,
	.tlb_all	= swift_flush_tlb_all,
	.tlb_mm		= swift_flush_tlb_mm,
	.tlb_page	= swift_flush_tlb_page,
	.tlb_range	= swift_flush_tlb_range,
	.page_to_ram	= swift_flush_page_to_ram,
	.sig_insns	= swift_flush_sig_insns,
	.page_for_dma	= swift_flush_page_for_dma,
};

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#define SWIFT_MASKID_ADDR  0x10003018
static void __init init_swift(void)
{
	unsigned long swift_rev;

	__asm__ __volatile__("lda [%1] %2, %0\n\t"
			     "srl %0, 0x18, %0\n\t" :
			     "=r" (swift_rev) :
			     "r" (SWIFT_MASKID_ADDR), "i" (ASI_M_BYPASS));
	srmmu_name = "Fujitsu Swift";
1094
	switch (swift_rev) {
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	case 0x11:
	case 0x20:
	case 0x23:
	case 0x30:
		srmmu_modtype = Swift_lots_o_bugs;
		hwbug_bitmask |= (HWBUG_KERN_ACCBROKEN | HWBUG_KERN_CBITBROKEN);
		/*
		 * Gee george, I wonder why Sun is so hush hush about
		 * this hardware bug... really braindamage stuff going
		 * on here.  However I think we can find a way to avoid
		 * all of the workaround overhead under Linux.  Basically,
		 * any page fault can cause kernel pages to become user
		 * accessible (the mmu gets confused and clears some of
		 * the ACC bits in kernel ptes).  Aha, sounds pretty
		 * horrible eh?  But wait, after extensive testing it appears
		 * that if you use pgd_t level large kernel pte's (like the
		 * 4MB pages on the Pentium) the bug does not get tripped
		 * at all.  This avoids almost all of the major overhead.
		 * Welcome to a world where your vendor tells you to,
		 * "apply this kernel patch" instead of "sorry for the
		 * broken hardware, send it back and we'll give you
		 * properly functioning parts"
		 */
		break;
	case 0x25:
	case 0x31:
		srmmu_modtype = Swift_bad_c;
		hwbug_bitmask |= HWBUG_KERN_CBITBROKEN;
		/*
		 * You see Sun allude to this hardware bug but never
		 * admit things directly, they'll say things like,
		 * "the Swift chip cache problems" or similar.
		 */
		break;
	default:
		srmmu_modtype = Swift_ok;
		break;
1132
	}
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	sparc32_cachetlb_ops = &swift_ops;
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	flush_page_for_dma_global = 0;

	/*
	 * Are you now convinced that the Swift is one of the
	 * biggest VLSI abortions of all time?  Bravo Fujitsu!
	 * Fujitsu, the !#?!%$'d up processor people.  I bet if
	 * you examined the microcode of the Swift you'd find
	 * XXX's all over the place.
	 */
	poke_srmmu = poke_swift;
}

static void turbosparc_flush_cache_all(void)
{
	flush_user_windows();
	turbosparc_idflash_clear();
}

static void turbosparc_flush_cache_mm(struct mm_struct *mm)
{
	FLUSH_BEGIN(mm)
	flush_user_windows();
	turbosparc_idflash_clear();
	FLUSH_END
}

static void turbosparc_flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
{
	FLUSH_BEGIN(vma->vm_mm)
	flush_user_windows();
	turbosparc_idflash_clear();
	FLUSH_END
}

static void turbosparc_flush_cache_page(struct vm_area_struct *vma, unsigned long page)
{
	FLUSH_BEGIN(vma->vm_mm)
	flush_user_windows();
	if (vma->vm_flags & VM_EXEC)
		turbosparc_flush_icache();
	turbosparc_flush_dcache();
	FLUSH_END
}

/* TurboSparc is copy-back, if we turn it on, but this does not work. */
static void turbosparc_flush_page_to_ram(unsigned long page)
{
#ifdef TURBOSPARC_WRITEBACK
	volatile unsigned long clear;

1185
	if (srmmu_probe(page))
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		turbosparc_flush_page_cache(page);
	clear = srmmu_get_fstatus();
#endif
}

static void turbosparc_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
{
}

static void turbosparc_flush_page_for_dma(unsigned long page)
{
	turbosparc_flush_dcache();
}

static void turbosparc_flush_tlb_all(void)
{
	srmmu_flush_whole_tlb();
}

static void turbosparc_flush_tlb_mm(struct mm_struct *mm)
{
	FLUSH_BEGIN(mm)
	srmmu_flush_whole_tlb();
	FLUSH_END
}

static void turbosparc_flush_tlb_range(struct vm_area_struct *vma, unsigned long start, unsigned long end)
{
	FLUSH_BEGIN(vma->vm_mm)
	srmmu_flush_whole_tlb();
	FLUSH_END
}

static void turbosparc_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
{
	FLUSH_BEGIN(vma->vm_mm)
	srmmu_flush_whole_tlb();
	FLUSH_END
}


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static void __cpuinit poke_turbosparc(void)
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{
	unsigned long mreg = srmmu_get_mmureg();
	unsigned long ccreg;

	/* Clear any crap from the cache or else... */
	turbosparc_flush_cache_all();
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	/* Temporarily disable I & D caches */
	mreg &= ~(TURBOSPARC_ICENABLE | TURBOSPARC_DCENABLE);
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	mreg &= ~(TURBOSPARC_PCENABLE);		/* Don't check parity */
	srmmu_set_mmureg(mreg);
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	ccreg = turbosparc_get_ccreg();

#ifdef TURBOSPARC_WRITEBACK
	ccreg |= (TURBOSPARC_SNENABLE);		/* Do DVMA snooping in Dcache */
	ccreg &= ~(TURBOSPARC_uS2 | TURBOSPARC_WTENABLE);
			/* Write-back D-cache, emulate VLSI
			 * abortion number three, not number one */
#else
	/* For now let's play safe, optimize later */
	ccreg |= (TURBOSPARC_SNENABLE | TURBOSPARC_WTENABLE);
			/* Do DVMA snooping in Dcache, Write-thru D-cache */
	ccreg &= ~(TURBOSPARC_uS2);
			/* Emulate VLSI abortion number three, not number one */
#endif

	switch (ccreg & 7) {
	case 0: /* No SE cache */
	case 7: /* Test mode */
		break;
	default:
		ccreg |= (TURBOSPARC_SCENABLE);
	}
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	turbosparc_set_ccreg(ccreg);
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	mreg |= (TURBOSPARC_ICENABLE | TURBOSPARC_DCENABLE); /* I & D caches on */
	mreg |= (TURBOSPARC_ICSNOOP);		/* Icache snooping on */
	srmmu_set_mmureg(mreg);
}

1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281
static const struct sparc32_cachetlb_ops turbosparc_ops = {
	.cache_all	= turbosparc_flush_cache_all,
	.cache_mm	= turbosparc_flush_cache_mm,
	.cache_page	= turbosparc_flush_cache_page,
	.cache_range	= turbosparc_flush_cache_range,
	.tlb_all	= turbosparc_flush_tlb_all,
	.tlb_mm		= turbosparc_flush_tlb_mm,
	.tlb_page	= turbosparc_flush_tlb_page,
	.tlb_range	= turbosparc_flush_tlb_range,
	.page_to_ram	= turbosparc_flush_page_to_ram,
	.sig_insns	= turbosparc_flush_sig_insns,
	.page_for_dma	= turbosparc_flush_page_for_dma,
};

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static void __init init_turbosparc(void)
{
	srmmu_name = "Fujitsu TurboSparc";
	srmmu_modtype = TurboSparc;
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	sparc32_cachetlb_ops = &turbosparc_ops;
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	poke_srmmu = poke_turbosparc;
}

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static void __cpuinit poke_tsunami(void)
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{
	unsigned long mreg = srmmu_get_mmureg();

	tsunami_flush_icache();
	tsunami_flush_dcache();
	mreg &= ~TSUNAMI_ITD;
	mreg |= (TSUNAMI_IENAB | TSUNAMI_DENAB);
	srmmu_set_mmureg(mreg);
}

1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314
static const struct sparc32_cachetlb_ops tsunami_ops = {
	.cache_all	= tsunami_flush_cache_all,
	.cache_mm	= tsunami_flush_cache_mm,
	.cache_page	= tsunami_flush_cache_page,
	.cache_range	= tsunami_flush_cache_range,
	.tlb_all	= tsunami_flush_tlb_all,
	.tlb_mm		= tsunami_flush_tlb_mm,
	.tlb_page	= tsunami_flush_tlb_page,
	.tlb_range	= tsunami_flush_tlb_range,
	.page_to_ram	= tsunami_flush_page_to_ram,
	.sig_insns	= tsunami_flush_sig_insns,
	.page_for_dma	= tsunami_flush_page_for_dma,
};

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static void __init init_tsunami(void)
{
	/*
	 * Tsunami's pretty sane, Sun and TI actually got it
	 * somewhat right this time.  Fujitsu should have
	 * taken some lessons from them.
	 */

	srmmu_name = "TI Tsunami";
	srmmu_modtype = Tsunami;
1325
	sparc32_cachetlb_ops = &tsunami_ops;
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	poke_srmmu = poke_tsunami;

	tsunami_setup_blockops();
}

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static void __cpuinit poke_viking(void)
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{
	unsigned long mreg = srmmu_get_mmureg();
	static int smp_catch;

1336
	if (viking_mxcc_present) {
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		unsigned long mxcc_control = mxcc_get_creg();

		mxcc_control |= (MXCC_CTL_ECE | MXCC_CTL_PRE | MXCC_CTL_MCE);
		mxcc_control &= ~(MXCC_CTL_RRC);
		mxcc_set_creg(mxcc_control);

		/*
		 * We don't need memory parity checks.
		 * XXX This is a mess, have to dig out later. ecd.
		viking_mxcc_turn_off_parity(&mreg, &mxcc_control);
		 */

		/* We do cache ptables on MXCC. */
		mreg |= VIKING_TCENABLE;
	} else {
		unsigned long bpreg;

		mreg &= ~(VIKING_TCENABLE);
1355
		if (smp_catch++) {
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			/* Must disable mixed-cmd mode here for other cpu's. */
			bpreg = viking_get_bpreg();
			bpreg &= ~(VIKING_ACTION_MIX);
			viking_set_bpreg(bpreg);

			/* Just in case PROM does something funny. */
			msi_set_sync();
		}
	}

	mreg |= VIKING_SPENABLE;
	mreg |= (VIKING_ICENABLE | VIKING_DCENABLE);
	mreg |= VIKING_SBENABLE;
	mreg &= ~(VIKING_ACENABLE);
	srmmu_set_mmureg(mreg);
}

1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415 1416 1417 1418
static struct sparc32_cachetlb_ops viking_ops = {
	.cache_all	= viking_flush_cache_all,
	.cache_mm	= viking_flush_cache_mm,
	.cache_page	= viking_flush_cache_page,
	.cache_range	= viking_flush_cache_range,
	.tlb_all	= viking_flush_tlb_all,
	.tlb_mm		= viking_flush_tlb_mm,
	.tlb_page	= viking_flush_tlb_page,
	.tlb_range	= viking_flush_tlb_range,
	.page_to_ram	= viking_flush_page_to_ram,
	.sig_insns	= viking_flush_sig_insns,
	.page_for_dma	= viking_flush_page_for_dma,
};

#ifdef CONFIG_SMP
/* On sun4d the cpu broadcasts local TLB flushes, so we can just
 * perform the local TLB flush and all the other cpus will see it.
 * But, unfortunately, there is a bug in the sun4d XBUS backplane
 * that requires that we add some synchronization to these flushes.
 *
 * The bug is that the fifo which keeps track of all the pending TLB
 * broadcasts in the system is an entry or two too small, so if we
 * have too many going at once we'll overflow that fifo and lose a TLB
 * flush resulting in corruption.
 *
 * Our workaround is to take a global spinlock around the TLB flushes,
 * which guarentees we won't ever have too many pending.  It's a big
 * hammer, but a semaphore like system to make sure we only have N TLB
 * flushes going at once will require SMP locking anyways so there's
 * no real value in trying any harder than this.
 */
static struct sparc32_cachetlb_ops viking_sun4d_smp_ops = {
	.cache_all	= viking_flush_cache_all,
	.cache_mm	= viking_flush_cache_mm,
	.cache_page	= viking_flush_cache_page,
	.cache_range	= viking_flush_cache_range,
	.tlb_all	= sun4dsmp_flush_tlb_all,
	.tlb_mm		= sun4dsmp_flush_tlb_mm,
	.tlb_page	= sun4dsmp_flush_tlb_page,
	.tlb_range	= sun4dsmp_flush_tlb_range,
	.page_to_ram	= viking_flush_page_to_ram,
	.sig_insns	= viking_flush_sig_insns,
	.page_for_dma	= viking_flush_page_for_dma,
};
#endif

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static void __init init_viking(void)
{
	unsigned long mreg = srmmu_get_mmureg();

	/* Ahhh, the viking.  SRMMU VLSI abortion number two... */
1424
	if (mreg & VIKING_MMODE) {
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		srmmu_name = "TI Viking";
		viking_mxcc_present = 0;
		msi_set_sync();

		/*
		 * We need this to make sure old viking takes no hits
		 * on it's cache for dma snoops to workaround the
		 * "load from non-cacheable memory" interrupt bug.
		 * This is only necessary because of the new way in
		 * which we use the IOMMU.
		 */
1436 1437 1438 1439
		viking_ops.page_for_dma = viking_flush_page;
#ifdef CONFIG_SMP
		viking_sun4d_smp_ops.page_for_dma = viking_flush_page;
#endif
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		flush_page_for_dma_global = 0;
	} else {
		srmmu_name = "TI Viking/MXCC";
		viking_mxcc_present = 1;
		srmmu_cache_pagetables = 1;
	}

1447 1448
	sparc32_cachetlb_ops = (const struct sparc32_cachetlb_ops *)
		&viking_ops;
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#ifdef CONFIG_SMP
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	if (sparc_cpu_model == sun4d)
		sparc32_cachetlb_ops = (const struct sparc32_cachetlb_ops *)
			&viking_sun4d_smp_ops;
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#endif

	poke_srmmu = poke_viking;
}

/* Probe for the srmmu chip version. */
static void __init get_srmmu_type(void)
{
	unsigned long mreg, psr;
	unsigned long mod_typ, mod_rev, psr_typ, psr_vers;

	srmmu_modtype = SRMMU_INVAL_MOD;
	hwbug_bitmask = 0;

	mreg = srmmu_get_mmureg(); psr = get_psr();
	mod_typ = (mreg & 0xf0000000) >> 28;
	mod_rev = (mreg & 0x0f000000) >> 24;
	psr_typ = (psr >> 28) & 0xf;
	psr_vers = (psr >> 24) & 0xf;

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	/* First, check for sparc-leon. */
	if (sparc_cpu_model == sparc_leon) {
		init_leon();
		return;
	}

	/* Second, check for HyperSparc or Cypress. */
1480 1481
	if (mod_typ == 1) {
		switch (mod_rev) {
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		case 7:
			/* UP or MP Hypersparc */
			init_hypersparc();
			break;
		case 0:
		case 2:
		case 10:
		case 11:
		case 12:
		case 13:
		case 14:
		case 15:
		default:
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			prom_printf("Sparc-Linux Cypress support does not longer exit.\n");
			prom_halt();
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			break;
1498
		}
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		return;
	}
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	/* Now Fujitsu TurboSparc. It might happen that it is
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	 * in Swift emulation mode, so we will check later...
	 */
	if (psr_typ == 0 && psr_vers == 5) {
		init_turbosparc();
		return;
	}

	/* Next check for Fujitsu Swift. */
1511
	if (psr_typ == 0 && psr_vers == 4) {
1512
		phandle cpunode;
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		char node_str[128];

		/* Look if it is not a TurboSparc emulating Swift... */
		cpunode = prom_getchild(prom_root_node);
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		while ((cpunode = prom_getsibling(cpunode)) != 0) {
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			prom_getstring(cpunode, "device_type", node_str, sizeof(node_str));
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			if (!strcmp(node_str, "cpu")) {
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				if (!prom_getintdefault(cpunode, "psr-implementation", 1) &&
				    prom_getintdefault(cpunode, "psr-version", 1) == 5) {
					init_turbosparc();
					return;
				}
				break;
			}
		}
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		init_swift();
		return;
	}

	/* Now the Viking family of srmmu. */
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	if (psr_typ == 4 &&
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	   ((psr_vers == 0) ||
	    ((psr_vers == 1) && (mod_typ == 0) && (mod_rev == 0)))) {
		init_viking();
		return;
	}

	/* Finally the Tsunami. */
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	if (psr_typ == 4 && psr_vers == 1 && (mod_typ || mod_rev)) {
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		init_tsunami();
		return;
	}

	/* Oh well */
	srmmu_is_bad();
}

#ifdef CONFIG_SMP
/* Local cross-calls. */
static void smp_flush_page_for_dma(unsigned long page)
{
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	xc1((smpfunc_t) local_ops->page_for_dma, page);
	local_ops->page_for_dma(page);
}

static void smp_flush_cache_all(void)
{
	xc0((smpfunc_t) local_ops->cache_all);
	local_ops->cache_all();
}

static void smp_flush_tlb_all(void)
{
	xc0((smpfunc_t) local_ops->tlb_all);
	local_ops->tlb_all();
}

static void smp_flush_cache_mm(struct mm_struct *mm)
{
	if (mm->context != NO_CONTEXT) {
		cpumask_t cpu_mask;
		cpumask_copy(&cpu_mask, mm_cpumask(mm));
		cpumask_clear_cpu(smp_processor_id(), &cpu_mask);
		if (!cpumask_empty(&cpu_mask))
			xc1((smpfunc_t) local_ops->cache_mm, (unsigned long) mm);
		local_ops->cache_mm(mm);
	}
}

static void smp_flush_tlb_mm(struct mm_struct *mm)
{
	if (mm->context != NO_CONTEXT) {
		cpumask_t cpu_mask;
		cpumask_copy(&cpu_mask, mm_cpumask(mm));
		cpumask_clear_cpu(smp_processor_id(), &cpu_mask);
		if (!cpumask_empty(&cpu_mask)) {
			xc1((smpfunc_t) local_ops->tlb_mm, (unsigned long) mm);
			if (atomic_read(&mm->mm_users) == 1 && current->active_mm == mm)
				cpumask_copy(mm_cpumask(mm),
					     cpumask_of(smp_processor_id()));
		}
		local_ops->tlb_mm(mm);
	}
}

static void smp_flush_cache_range(struct vm_area_struct *vma,
				  unsigned long start,
				  unsigned long end)
{
	struct mm_struct *mm = vma->vm_mm;

	if (mm->context != NO_CONTEXT) {
		cpumask_t cpu_mask;
		cpumask_copy(&cpu_mask, mm_cpumask(mm));
		cpumask_clear_cpu(smp_processor_id(), &cpu_mask);
		if (!cpumask_empty(&cpu_mask))
			xc3((smpfunc_t) local_ops->cache_range,
			    (unsigned long) vma, start, end);
		local_ops->cache_range(vma, start, end);
	}
}

static void smp_flush_tlb_range(struct vm_area_struct *vma,
				unsigned long start,
				unsigned long end)
{
	struct mm_struct *mm = vma->vm_mm;

	if (mm->context != NO_CONTEXT) {
		cpumask_t cpu_mask;
		cpumask_copy(&cpu_mask, mm_cpumask(mm));
		cpumask_clear_cpu(smp_processor_id(), &cpu_mask);
		if (!cpumask_empty(&cpu_mask))
			xc3((smpfunc_t) local_ops->tlb_range,
			    (unsigned long) vma, start, end);
		local_ops->tlb_range(vma, start, end);
	}
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}

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static void smp_flush_cache_page(struct vm_area_struct *vma, unsigned long page)
{
	struct mm_struct *mm = vma->vm_mm;

	if (mm->context != NO_CONTEXT) {
		cpumask_t cpu_mask;
		cpumask_copy(&cpu_mask, mm_cpumask(mm));
		cpumask_clear_cpu(smp_processor_id(), &cpu_mask);
		if (!cpumask_empty(&cpu_mask))
			xc2((smpfunc_t) local_ops->cache_page,
			    (unsigned long) vma, page);
		local_ops->cache_page(vma, page);
	}
}

static void smp_flush_tlb_page(struct vm_area_struct *vma, unsigned long page)
{
	struct mm_struct *mm = vma->vm_mm;

	if (mm->context != NO_CONTEXT) {
		cpumask_t cpu_mask;
		cpumask_copy(&cpu_mask, mm_cpumask(mm));
		cpumask_clear_cpu(smp_processor_id(), &cpu_mask);
		if (!cpumask_empty(&cpu_mask))
			xc2((smpfunc_t) local_ops->tlb_page,
			    (unsigned long) vma, page);
		local_ops->tlb_page(vma, page);
	}
}

static void smp_flush_page_to_ram(unsigned long page)
{
	/* Current theory is that those who call this are the one's
	 * who have just dirtied their cache with the pages contents
	 * in kernel space, therefore we only run this on local cpu.
	 *
	 * XXX This experiment failed, research further... -DaveM
	 */
#if 1
	xc1((smpfunc_t) local_ops->page_to_ram, page);
#endif
	local_ops->page_to_ram(page);
}

static void smp_flush_sig_insns(struct mm_struct *mm, unsigned long insn_addr)
{
	cpumask_t cpu_mask;
	cpumask_copy(&cpu_mask, mm_cpumask(mm));
	cpumask_clear_cpu(smp_processor_id(), &cpu_mask);
	if (!cpumask_empty(&cpu_mask))
		xc2((smpfunc_t) local_ops->sig_insns,
		    (unsigned long) mm, insn_addr);
	local_ops->sig_insns(mm, insn_addr);
}

static struct sparc32_cachetlb_ops smp_cachetlb_ops = {
	.cache_all	= smp_flush_cache_all,
	.cache_mm	= smp_flush_cache_mm,
	.cache_page	= smp_flush_cache_page,
	.cache_range	= smp_flush_cache_range,
	.tlb_all	= smp_flush_tlb_all,
	.tlb_mm		= smp_flush_tlb_mm,
	.tlb_page	= smp_flush_tlb_page,
	.tlb_range	= smp_flush_tlb_range,
	.page_to_ram	= smp_flush_page_to_ram,
	.sig_insns	= smp_flush_sig_insns,
	.page_for_dma	= smp_flush_page_for_dma,
};
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#endif

/* Load up routines and constants for sun4m and sun4d mmu */
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void __init load_mmu(void)
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{
	extern void ld_mmu_iommu(void);
	extern void ld_mmu_iounit(void);

	/* Functions */
	get_srmmu_type();

#ifdef CONFIG_SMP
	/* El switcheroo... */
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	local_ops = sparc32_cachetlb_ops;
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	if (sparc_cpu_model == sun4d || sparc_cpu_model == sparc_leon) {
		smp_cachetlb_ops.tlb_all = local_ops->tlb_all;
		smp_cachetlb_ops.tlb_mm = local_ops->tlb_mm;
		smp_cachetlb_ops.tlb_range = local_ops->tlb_range;
		smp_cachetlb_ops.tlb_page = local_ops->tlb_page;
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	}
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	if (poke_srmmu == poke_viking) {
		/* Avoid unnecessary cross calls. */
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		smp_cachetlb_ops.cache_all = local_ops->cache_all;
		smp_cachetlb_ops.cache_mm = local_ops->cache_mm;
		smp_cachetlb_ops.cache_range = local_ops->cache_range;
		smp_cachetlb_ops.cache_page = local_ops->cache_page;

		smp_cachetlb_ops.page_to_ram = local_ops->page_to_ram;
		smp_cachetlb_ops.sig_insns = local_ops->sig_insns;
		smp_cachetlb_ops.page_for_dma = local_ops->page_for_dma;
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	}
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	/* It really is const after this point. */
	sparc32_cachetlb_ops = (const struct sparc32_cachetlb_ops *)
		&smp_cachetlb_ops;
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#endif

	if (sparc_cpu_model == sun4d)
		ld_mmu_iounit();
	else
		ld_mmu_iommu();
#ifdef CONFIG_SMP
	if (sparc_cpu_model == sun4d)
		sun4d_init_smp();
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	else if (sparc_cpu_model == sparc_leon)
		leon_init_smp();
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	else
		sun4m_init_smp();
#endif
}