[deliverable/linux.git] / arch / mips / mm / init.c

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 1994 - 2000 Ralf Baechle
 * Copyright (C) 1999, 2000 Silicon Graphics, Inc.
 * Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
 * Copyright (C) 2000 MIPS Technologies, Inc.  All rights reserved.
 */
#include <linux/init.h>
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/pagemap.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/bootmem.h>
#include <linux/highmem.h>
#include <linux/swap.h>
#include <linux/proc_fs.h>
#include <linux/pfn.h>

#include <asm/asm-offsets.h>
#include <asm/bootinfo.h>
#include <asm/cachectl.h>
#include <asm/cpu.h>
#include <asm/dma.h>
#include <asm/kmap_types.h>
#include <asm/mmu_context.h>
#include <asm/sections.h>
#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/tlb.h>
#include <asm/fixmap.h>

/* Atomicity and interruptability */
#ifdef CONFIG_MIPS_MT_SMTC

#include <asm/mipsmtregs.h>

#define ENTER_CRITICAL(flags) \
	{ \
	unsigned int mvpflags; \
	local_irq_save(flags);\
	mvpflags = dvpe()
#define EXIT_CRITICAL(flags) \
	evpe(mvpflags); \
	local_irq_restore(flags); \
	}
#else

#define ENTER_CRITICAL(flags) local_irq_save(flags)
#define EXIT_CRITICAL(flags) local_irq_restore(flags)

#endif /* CONFIG_MIPS_MT_SMTC */

DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);

/*
 * We have up to 8 empty zeroed pages so we can map one of the right colour
 * when needed.  This is necessary only on R4000 / R4400 SC and MC versions
 * where we have to avoid VCED / VECI exceptions for good performance at
 * any price.  Since page is never written to after the initialization we
 * don't have to care about aliases on other CPUs.
 */
unsigned long empty_zero_page, zero_page_mask;

/*
 * Not static inline because used by IP27 special magic initialization code
 */
unsigned long setup_zero_pages(void)
{
	unsigned int order;
	unsigned long size;
	struct page *page;

	if (cpu_has_vce)
		order = 3;
	else
		order = 0;

	empty_zero_page = __get_free_pages(GFP_KERNEL | __GFP_ZERO, order);
	if (!empty_zero_page)
		panic("Oh boy, that early out of memory?");

	page = virt_to_page((void *)empty_zero_page);
	split_page(page, order);
	while (page < virt_to_page((void *)(empty_zero_page + (PAGE_SIZE << order)))) {
		SetPageReserved(page);
		page++;
	}

	size = PAGE_SIZE << order;
	zero_page_mask = (size - 1) & PAGE_MASK;

	return 1UL << order;
}

/*
 * These are almost like kmap_atomic / kunmap_atmic except they take an
 * additional address argument as the hint.
 */

#define kmap_get_fixmap_pte(vaddr)					\
	pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr))

#ifdef CONFIG_MIPS_MT_SMTC
static pte_t *kmap_coherent_pte;
static void __init kmap_coherent_init(void)
{
	unsigned long vaddr;

	/* cache the first coherent kmap pte */
	vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
	kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
}
#else
static inline void kmap_coherent_init(void) {}
#endif

void *kmap_coherent(struct page *page, unsigned long addr)
{
	enum fixed_addresses idx;
	unsigned long vaddr, flags, entrylo;
	unsigned long old_ctx;
	pte_t pte;
	int tlbidx;

	inc_preempt_count();
	idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
#ifdef CONFIG_MIPS_MT_SMTC
	idx += FIX_N_COLOURS * smp_processor_id();
#endif
	vaddr = __fix_to_virt(FIX_CMAP_END - idx);
	pte = mk_pte(page, PAGE_KERNEL);
#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
	entrylo = pte.pte_high;
#else
	entrylo = pte_val(pte) >> 6;
#endif

	ENTER_CRITICAL(flags);
	old_ctx = read_c0_entryhi();
	write_c0_entryhi(vaddr & (PAGE_MASK << 1));
	write_c0_entrylo0(entrylo);
	write_c0_entrylo1(entrylo);
#ifdef CONFIG_MIPS_MT_SMTC
	set_pte(kmap_coherent_pte - (FIX_CMAP_END - idx), pte);
	/* preload TLB instead of local_flush_tlb_one() */
	mtc0_tlbw_hazard();
	tlb_probe();
	tlb_probe_hazard();
	tlbidx = read_c0_index();
	mtc0_tlbw_hazard();
	if (tlbidx < 0)
		tlb_write_random();
	else
		tlb_write_indexed();
#else
	tlbidx = read_c0_wired();
	write_c0_wired(tlbidx + 1);
	write_c0_index(tlbidx);
	mtc0_tlbw_hazard();
	tlb_write_indexed();
#endif
	tlbw_use_hazard();
	write_c0_entryhi(old_ctx);
	EXIT_CRITICAL(flags);

	return (void*) vaddr;
}

#define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))

void kunmap_coherent(void)
{
#ifndef CONFIG_MIPS_MT_SMTC
	unsigned int wired;
	unsigned long flags, old_ctx;

	ENTER_CRITICAL(flags);
	old_ctx = read_c0_entryhi();
	wired = read_c0_wired() - 1;
	write_c0_wired(wired);
	write_c0_index(wired);
	write_c0_entryhi(UNIQUE_ENTRYHI(wired));
	write_c0_entrylo0(0);
	write_c0_entrylo1(0);
	mtc0_tlbw_hazard();
	tlb_write_indexed();
	tlbw_use_hazard();
	write_c0_entryhi(old_ctx);
	EXIT_CRITICAL(flags);
#endif
	dec_preempt_count();
	preempt_check_resched();
}

void copy_user_highpage(struct page *to, struct page *from,
	unsigned long vaddr, struct vm_area_struct *vma)
{
	void *vfrom, *vto;

	vto = kmap_atomic(to, KM_USER1);
	if (cpu_has_dc_aliases) {
		vfrom = kmap_coherent(from, vaddr);
		copy_page(vto, vfrom);
		kunmap_coherent();
	} else {
		vfrom = kmap_atomic(from, KM_USER0);
		copy_page(vto, vfrom);
		kunmap_atomic(vfrom, KM_USER0);
	}
	if (((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc) ||
	    pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
		flush_data_cache_page((unsigned long)vto);
	kunmap_atomic(vto, KM_USER1);
	/* Make sure this page is cleared on other CPU's too before using it */
	smp_wmb();
}

EXPORT_SYMBOL(copy_user_highpage);

void copy_to_user_page(struct vm_area_struct *vma,
	struct page *page, unsigned long vaddr, void *dst, const void *src,
	unsigned long len)
{
	if (cpu_has_dc_aliases) {
		void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
		memcpy(vto, src, len);
		kunmap_coherent();
	} else
		memcpy(dst, src, len);
	if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc)
		flush_cache_page(vma, vaddr, page_to_pfn(page));
}

EXPORT_SYMBOL(copy_to_user_page);

void copy_from_user_page(struct vm_area_struct *vma,
	struct page *page, unsigned long vaddr, void *dst, const void *src,
	unsigned long len)
{
	if (cpu_has_dc_aliases) {
		void *vfrom =
			kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
		memcpy(dst, vfrom, len);
		kunmap_coherent();
	} else
		memcpy(dst, src, len);
}

EXPORT_SYMBOL(copy_from_user_page);


#ifdef CONFIG_HIGHMEM
unsigned long highstart_pfn, highend_pfn;

pte_t *kmap_pte;
pgprot_t kmap_prot;

static void __init kmap_init(void)
{
	unsigned long kmap_vstart;

	/* cache the first kmap pte */
	kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
	kmap_pte = kmap_get_fixmap_pte(kmap_vstart);

	kmap_prot = PAGE_KERNEL;
}
#endif /* CONFIG_HIGHMEM */

void __init fixrange_init(unsigned long start, unsigned long end,
	pgd_t *pgd_base)
{
#if defined(CONFIG_HIGHMEM) || defined(CONFIG_MIPS_MT_SMTC)
	pgd_t *pgd;
	pud_t *pud;
	pmd_t *pmd;
	pte_t *pte;
	int i, j, k;
	unsigned long vaddr;

	vaddr = start;
	i = __pgd_offset(vaddr);
	j = __pud_offset(vaddr);
	k = __pmd_offset(vaddr);
	pgd = pgd_base + i;

	for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
		pud = (pud_t *)pgd;
		for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
			pmd = (pmd_t *)pud;
			for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
				if (pmd_none(*pmd)) {
					pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
					set_pmd(pmd, __pmd((unsigned long)pte));
					if (pte != pte_offset_kernel(pmd, 0))
						BUG();
				}
				vaddr += PMD_SIZE;
			}
			k = 0;
		}
		j = 0;
	}
#endif
}

#ifndef CONFIG_NEED_MULTIPLE_NODES
static int __init page_is_ram(unsigned long pagenr)
{
	int i;

	for (i = 0; i < boot_mem_map.nr_map; i++) {
		unsigned long addr, end;

		if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
			/* not usable memory */
			continue;

		addr = PFN_UP(boot_mem_map.map[i].addr);
		end = PFN_DOWN(boot_mem_map.map[i].addr +
			       boot_mem_map.map[i].size);

		if (pagenr >= addr && pagenr < end)
			return 1;
	}

	return 0;
}

void __init paging_init(void)
{
	unsigned long zones_size[MAX_NR_ZONES] = { 0, };
#ifndef CONFIG_FLATMEM
	unsigned long zholes_size[MAX_NR_ZONES] = { 0, };
	unsigned long i, j, pfn;
#endif

	pagetable_init();

#ifdef CONFIG_HIGHMEM
	kmap_init();
#endif
	kmap_coherent_init();

#ifdef CONFIG_ZONE_DMA
	if (min_low_pfn < MAX_DMA_PFN && MAX_DMA_PFN <= max_low_pfn) {
		zones_size[ZONE_DMA] = MAX_DMA_PFN - min_low_pfn;
		zones_size[ZONE_NORMAL] = max_low_pfn - MAX_DMA_PFN;
	} else if (max_low_pfn < MAX_DMA_PFN)
		zones_size[ZONE_DMA] = max_low_pfn - min_low_pfn;
	else
#endif
	zones_size[ZONE_NORMAL] = max_low_pfn - min_low_pfn;

#ifdef CONFIG_HIGHMEM
	zones_size[ZONE_HIGHMEM] = highend_pfn - highstart_pfn;

	if (cpu_has_dc_aliases && zones_size[ZONE_HIGHMEM]) {
		printk(KERN_WARNING "This processor doesn't support highmem."
		       " %ldk highmem ignored\n", zones_size[ZONE_HIGHMEM]);
		zones_size[ZONE_HIGHMEM] = 0;
	}
#endif

#ifdef CONFIG_FLATMEM
	free_area_init(zones_size);
#else
	pfn = min_low_pfn;
	for (i = 0; i < MAX_NR_ZONES; i++)
		for (j = 0; j < zones_size[i]; j++, pfn++)
			if (!page_is_ram(pfn))
				zholes_size[i]++;
	free_area_init_node(0, NODE_DATA(0), zones_size, 0, zholes_size);
#endif
}

static struct kcore_list kcore_mem, kcore_vmalloc;
#ifdef CONFIG_64BIT
static struct kcore_list kcore_kseg0;
#endif

void __init mem_init(void)
{
	unsigned long codesize, reservedpages, datasize, initsize;
	unsigned long tmp, ram;

#ifdef CONFIG_HIGHMEM
#ifdef CONFIG_DISCONTIGMEM
#error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
#endif
	max_mapnr = highend_pfn;
#else
	max_mapnr = max_low_pfn;
#endif
	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);

	totalram_pages += free_all_bootmem();
	totalram_pages -= setup_zero_pages();	/* Setup zeroed pages.  */

	reservedpages = ram = 0;
	for (tmp = 0; tmp < max_low_pfn; tmp++)
		if (page_is_ram(tmp)) {
			ram++;
			if (PageReserved(pfn_to_page(tmp)))
				reservedpages++;
		}
	num_physpages = ram;

#ifdef CONFIG_HIGHMEM
	for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
		struct page *page = mem_map + tmp;

		if (!page_is_ram(tmp)) {
			SetPageReserved(page);
			continue;
		}
		ClearPageReserved(page);
		init_page_count(page);
		__free_page(page);
		totalhigh_pages++;
	}
	totalram_pages += totalhigh_pages;
	num_physpages += totalhigh_pages;
#endif

	codesize =  (unsigned long) &_etext - (unsigned long) &_text;
	datasize =  (unsigned long) &_edata - (unsigned long) &_etext;
	initsize =  (unsigned long) &__init_end - (unsigned long) &__init_begin;

#ifdef CONFIG_64BIT
	if ((unsigned long) &_text > (unsigned long) CKSEG0)
		/* The -4 is a hack so that user tools don't have to handle
		   the overflow.  */
		kclist_add(&kcore_kseg0, (void *) CKSEG0, 0x80000000 - 4);
#endif
	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
		   VMALLOC_END-VMALLOC_START);

	printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
	       "%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
	       (unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
	       ram << (PAGE_SHIFT-10),
	       codesize >> 10,
	       reservedpages << (PAGE_SHIFT-10),
	       datasize >> 10,
	       initsize >> 10,
	       (unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
}
#endif /* !CONFIG_NEED_MULTIPLE_NODES */

void free_init_pages(const char *what, unsigned long begin, unsigned long end)
{
	unsigned long pfn;

	for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
		struct page *page = pfn_to_page(pfn);
		void *addr = phys_to_virt(PFN_PHYS(pfn));

		ClearPageReserved(page);
		init_page_count(page);
		memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
		__free_page(page);
		totalram_pages++;
	}
	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
}

#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
	free_init_pages("initrd memory",
			virt_to_phys((void *)start),
			virt_to_phys((void *)end));
}
#endif

void __init_refok free_initmem(void)
{
	prom_free_prom_memory();
	free_init_pages("unused kernel memory",
			__pa_symbol(&__init_begin),
			__pa_symbol(&__init_end));
}

unsigned long pgd_current[NR_CPUS];
/*
 * On 64-bit we've got three-level pagetables with a slightly
 * different layout ...
 */
#define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))

/*
 * gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
 * are constants.  So we use the variants from asm-offset.h until that gcc
 * will officially be retired.
 */
pgd_t swapper_pg_dir[_PTRS_PER_PGD] __page_aligned(_PGD_ORDER);
#ifdef CONFIG_64BIT
#ifdef MODULE_START
pgd_t module_pg_dir[PTRS_PER_PGD] __page_aligned(PGD_ORDER);
#endif
pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned(PMD_ORDER);
#endif
pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* This file is subject to the terms and conditions of the GNU General Public
	3	* License. See the file "COPYING" in the main directory of this archive
	4	* for more details.
	5	*
	6	* Copyright (C) 1994 - 2000 Ralf Baechle
	7	* Copyright (C) 1999, 2000 Silicon Graphics, Inc.
	8	* Kevin D. Kissell, kevink@mips.com and Carsten Langgaard, carstenl@mips.com
	9	* Copyright (C) 2000 MIPS Technologies, Inc. All rights reserved.
	10	*/
1da177e4 LT	11	#include <linux/init.h>
	12	#include <linux/module.h>
	13	#include <linux/signal.h>
	14	#include <linux/sched.h>
	15	#include <linux/kernel.h>
	16	#include <linux/errno.h>
	17	#include <linux/string.h>
	18	#include <linux/types.h>
	19	#include <linux/pagemap.h>
	20	#include <linux/ptrace.h>
	21	#include <linux/mman.h>
	22	#include <linux/mm.h>
	23	#include <linux/bootmem.h>
	24	#include <linux/highmem.h>
	25	#include <linux/swap.h>
3d503753	26	#include <linux/proc_fs.h>
22a9835c	27	#include <linux/pfn.h>
1da177e4	28
9975e77d	29	#include <asm/asm-offsets.h>
1da177e4 LT	30	#include <asm/bootinfo.h>
	31	#include <asm/cachectl.h>
	32	#include <asm/cpu.h>
	33	#include <asm/dma.h>
f8829cae	34	#include <asm/kmap_types.h>
1da177e4 LT	35	#include <asm/mmu_context.h>
	36	#include <asm/sections.h>
	37	#include <asm/pgtable.h>
	38	#include <asm/pgalloc.h>
	39	#include <asm/tlb.h>
f8829cae RB	40	#include <asm/fixmap.h>
	41
	42	/* Atomicity and interruptability */
	43	#ifdef CONFIG_MIPS_MT_SMTC
	44
	45	#include <asm/mipsmtregs.h>
	46
	47	#define ENTER_CRITICAL(flags) \
	48	{ \
	49	unsigned int mvpflags; \
	50	local_irq_save(flags);\
	51	mvpflags = dvpe()
	52	#define EXIT_CRITICAL(flags) \
	53	evpe(mvpflags); \
	54	local_irq_restore(flags); \
	55	}
	56	#else
	57
	58	#define ENTER_CRITICAL(flags) local_irq_save(flags)
	59	#define EXIT_CRITICAL(flags) local_irq_restore(flags)
	60
	61	#endif /* CONFIG_MIPS_MT_SMTC */
1da177e4 LT	62
	63	DEFINE_PER_CPU(struct mmu_gather, mmu_gathers);
	64
1da177e4 LT	65	/*
	66	* We have up to 8 empty zeroed pages so we can map one of the right colour
	67	* when needed. This is necessary only on R4000 / R4400 SC and MC versions
	68	* where we have to avoid VCED / VECI exceptions for good performance at
	69	* any price. Since page is never written to after the initialization we
	70	* don't have to care about aliases on other CPUs.
	71	*/
	72	unsigned long empty_zero_page, zero_page_mask;
	73
	74	/*
	75	* Not static inline because used by IP27 special magic initialization code
	76	*/
	77	unsigned long setup_zero_pages(void)
	78	{
8dfcc9ba NP	79	unsigned int order;
8dfcc9ba NP	80	unsigned long size;
1da177e4 LT	81	struct page *page;
	82
	83	if (cpu_has_vce)
	84	order = 3;
	85	else
	86	order = 0;
	87
	88	empty_zero_page = __get_free_pages(GFP_KERNEL \| __GFP_ZERO, order);
	89	if (!empty_zero_page)
	90	panic("Oh boy, that early out of memory?");
	91
99e3b942	92	page = virt_to_page((void *)empty_zero_page);
8dfcc9ba	93	split_page(page, order);
99e3b942	94	while (page < virt_to_page((void *)(empty_zero_page + (PAGE_SIZE << order)))) {
68352e6e	95	SetPageReserved(page);
1da177e4 LT	96	page++;
	97	}
	98
	99	size = PAGE_SIZE << order;
	100	zero_page_mask = (size - 1) & PAGE_MASK;
	101
	102	return 1UL << order;
	103	}
	104
f8829cae RB	105	/*
	106	* These are almost like kmap_atomic / kunmap_atmic except they take an
	107	* additional address argument as the hint.
	108	*/
1da177e4 LT	109
1da177e4 LT	110	#define kmap_get_fixmap_pte(vaddr) \
c6e8b587	111	pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr), (vaddr)), (vaddr)), (vaddr))
1da177e4	112
f8829cae RB	113	#ifdef CONFIG_MIPS_MT_SMTC
	114	static pte_t *kmap_coherent_pte;
	115	static void __init kmap_coherent_init(void)
	116	{
	117	unsigned long vaddr;
	118
	119	/* cache the first coherent kmap pte */
	120	vaddr = __fix_to_virt(FIX_CMAP_BEGIN);
	121	kmap_coherent_pte = kmap_get_fixmap_pte(vaddr);
	122	}
	123	#else
	124	static inline void kmap_coherent_init(void) {}
	125	#endif
	126
7575a49f	127	void kmap_coherent(struct page page, unsigned long addr)
f8829cae RB	128	{
	129	enum fixed_addresses idx;
	130	unsigned long vaddr, flags, entrylo;
	131	unsigned long old_ctx;
	132	pte_t pte;
	133	int tlbidx;
	134
	135	inc_preempt_count();
	136	idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
	137	#ifdef CONFIG_MIPS_MT_SMTC
	138	idx += FIX_N_COLOURS * smp_processor_id();
	139	#endif
	140	vaddr = __fix_to_virt(FIX_CMAP_END - idx);
	141	pte = mk_pte(page, PAGE_KERNEL);
	142	#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
	143	entrylo = pte.pte_high;
	144	#else
	145	entrylo = pte_val(pte) >> 6;
	146	#endif
	147
	148	ENTER_CRITICAL(flags);
	149	old_ctx = read_c0_entryhi();
	150	write_c0_entryhi(vaddr & (PAGE_MASK << 1));
	151	write_c0_entrylo0(entrylo);
	152	write_c0_entrylo1(entrylo);
	153	#ifdef CONFIG_MIPS_MT_SMTC
	154	set_pte(kmap_coherent_pte - (FIX_CMAP_END - idx), pte);
	155	/* preload TLB instead of local_flush_tlb_one() */
	156	mtc0_tlbw_hazard();
	157	tlb_probe();
	158	tlb_probe_hazard();
	159	tlbidx = read_c0_index();
	160	mtc0_tlbw_hazard();
	161	if (tlbidx < 0)
	162	tlb_write_random();
	163	else
	164	tlb_write_indexed();
	165	#else
	166	tlbidx = read_c0_wired();
	167	write_c0_wired(tlbidx + 1);
	168	write_c0_index(tlbidx);
	169	mtc0_tlbw_hazard();
	170	tlb_write_indexed();
	171	#endif
	172	tlbw_use_hazard();
	173	write_c0_entryhi(old_ctx);
	174	EXIT_CRITICAL(flags);
	175
	176	return (void*) vaddr;
	177	}
	178
	179	#define UNIQUE_ENTRYHI(idx) (CKSEG0 + ((idx) << (PAGE_SHIFT + 1)))
	180
eacb9d61	181	void kunmap_coherent(void)
f8829cae RB	182	{
	183	#ifndef CONFIG_MIPS_MT_SMTC
	184	unsigned int wired;
	185	unsigned long flags, old_ctx;
	186
	187	ENTER_CRITICAL(flags);
	188	old_ctx = read_c0_entryhi();
	189	wired = read_c0_wired() - 1;
	190	write_c0_wired(wired);
	191	write_c0_index(wired);
	192	write_c0_entryhi(UNIQUE_ENTRYHI(wired));
	193	write_c0_entrylo0(0);
	194	write_c0_entrylo1(0);
	195	mtc0_tlbw_hazard();
	196	tlb_write_indexed();
	197	tlbw_use_hazard();
	198	write_c0_entryhi(old_ctx);
	199	EXIT_CRITICAL(flags);
	200	#endif
	201	dec_preempt_count();
	202	preempt_check_resched();
	203	}
	204
bcd02280 AN	205	void copy_user_highpage(struct page to, struct page from,
	206	unsigned long vaddr, struct vm_area_struct *vma)
	207	{
	208	void vfrom, vto;
	209
	210	vto = kmap_atomic(to, KM_USER1);
	211	if (cpu_has_dc_aliases) {
	212	vfrom = kmap_coherent(from, vaddr);
	213	copy_page(vto, vfrom);
eacb9d61	214	kunmap_coherent();
bcd02280 AN	215	} else {
	216	vfrom = kmap_atomic(from, KM_USER0);
	217	copy_page(vto, vfrom);
	218	kunmap_atomic(vfrom, KM_USER0);
	219	}
	220	if (((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc) \|\|
	221	pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
	222	flush_data_cache_page((unsigned long)vto);
	223	kunmap_atomic(vto, KM_USER1);
	224	/* Make sure this page is cleared on other CPU's too before using it */
	225	smp_wmb();
	226	}
	227
	228	EXPORT_SYMBOL(copy_user_highpage);
	229
f8829cae RB	230	void copy_to_user_page(struct vm_area_struct *vma,
	231	struct page page, unsigned long vaddr, void dst, const void *src,
	232	unsigned long len)
	233	{
	234	if (cpu_has_dc_aliases) {
	235	void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
	236	memcpy(vto, src, len);
eacb9d61	237	kunmap_coherent();
f8829cae RB	238	} else
	239	memcpy(dst, src, len);
	240	if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc)
	241	flush_cache_page(vma, vaddr, page_to_pfn(page));
	242	}
	243
	244	EXPORT_SYMBOL(copy_to_user_page);
	245
	246	void copy_from_user_page(struct vm_area_struct *vma,
	247	struct page page, unsigned long vaddr, void dst, const void *src,
	248	unsigned long len)
	249	{
	250	if (cpu_has_dc_aliases) {
	251	void *vfrom =
	252	kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
	253	memcpy(dst, vfrom, len);
eacb9d61	254	kunmap_coherent();
f8829cae RB	255	} else
	256	memcpy(dst, src, len);
	257	}
	258
	259	EXPORT_SYMBOL(copy_from_user_page);
	260
	261
	262	#ifdef CONFIG_HIGHMEM
bf15f767 RB	263	unsigned long highstart_pfn, highend_pfn;
bf15f767 RB	264
f8829cae RB	265	pte_t *kmap_pte;
	266	pgprot_t kmap_prot;
	267
1da177e4 LT	268	static void __init kmap_init(void)
	269	{
	270	unsigned long kmap_vstart;
	271
	272	/* cache the first kmap pte */
	273	kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
	274	kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
	275
	276	kmap_prot = PAGE_KERNEL;
	277	}
f8829cae	278	#endif /* CONFIG_HIGHMEM */
1da177e4	279
84fd089a	280	void __init fixrange_init(unsigned long start, unsigned long end,
1da177e4 LT	281	pgd_t *pgd_base)
1da177e4 LT	282	{
f8829cae	283	#if defined(CONFIG_HIGHMEM) \|\| defined(CONFIG_MIPS_MT_SMTC)
1da177e4	284	pgd_t *pgd;
c6e8b587	285	pud_t *pud;
1da177e4 LT	286	pmd_t *pmd;
1da177e4 LT	287	pte_t *pte;
c6e8b587	288	int i, j, k;
1da177e4 LT	289	unsigned long vaddr;
	290
	291	vaddr = start;
	292	i = __pgd_offset(vaddr);
c6e8b587 RB	293	j = __pud_offset(vaddr);
c6e8b587 RB	294	k = __pmd_offset(vaddr);
1da177e4 LT	295	pgd = pgd_base + i;
	296
	297	for ( ; (i < PTRS_PER_PGD) && (vaddr != end); pgd++, i++) {
c6e8b587 RB	298	pud = (pud_t *)pgd;
	299	for ( ; (j < PTRS_PER_PUD) && (vaddr != end); pud++, j++) {
	300	pmd = (pmd_t *)pud;
	301	for (; (k < PTRS_PER_PMD) && (vaddr != end); pmd++, k++) {
	302	if (pmd_none(*pmd)) {
	303	pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
f8829cae	304	set_pmd(pmd, __pmd((unsigned long)pte));
c6e8b587 RB	305	if (pte != pte_offset_kernel(pmd, 0))
	306	BUG();
	307	}
	308	vaddr += PMD_SIZE;
1da177e4	309	}
c6e8b587	310	k = 0;
1da177e4 LT	311	}
	312	j = 0;
	313	}
f8829cae	314	#endif
1da177e4	315	}
1da177e4	316
b4819b59	317	#ifndef CONFIG_NEED_MULTIPLE_NODES
565200a1 AN	318	static int __init page_is_ram(unsigned long pagenr)
	319	{
	320	int i;
	321
	322	for (i = 0; i < boot_mem_map.nr_map; i++) {
	323	unsigned long addr, end;
	324
	325	if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
	326	/* not usable memory */
	327	continue;
	328
	329	addr = PFN_UP(boot_mem_map.map[i].addr);
	330	end = PFN_DOWN(boot_mem_map.map[i].addr +
	331	boot_mem_map.map[i].size);
	332
	333	if (pagenr >= addr && pagenr < end)
	334	return 1;
	335	}
	336
	337	return 0;
	338	}
	339
1da177e4 LT	340	void __init paging_init(void)
1da177e4 LT	341	{
b58e5d05	342	unsigned long zones_size[MAX_NR_ZONES] = { 0, };
565200a1	343	#ifndef CONFIG_FLATMEM
b58e5d05	344	unsigned long zholes_size[MAX_NR_ZONES] = { 0, };
565200a1 AN	345	unsigned long i, j, pfn;
565200a1 AN	346	#endif
1da177e4 LT	347
	348	pagetable_init();
	349
	350	#ifdef CONFIG_HIGHMEM
	351	kmap_init();
	352	#endif
f8829cae	353	kmap_coherent_init();
1da177e4	354
05502339 AN	355	#ifdef CONFIG_ZONE_DMA
	356	if (min_low_pfn < MAX_DMA_PFN && MAX_DMA_PFN <= max_low_pfn) {
	357	zones_size[ZONE_DMA] = MAX_DMA_PFN - min_low_pfn;
	358	zones_size[ZONE_NORMAL] = max_low_pfn - MAX_DMA_PFN;
	359	} else if (max_low_pfn < MAX_DMA_PFN)
	360	zones_size[ZONE_DMA] = max_low_pfn - min_low_pfn;
db84dc61	361	else
1da177e4	362	#endif
05502339	363	zones_size[ZONE_NORMAL] = max_low_pfn - min_low_pfn;
db84dc61	364
1da177e4	365	#ifdef CONFIG_HIGHMEM
cbb8fc07 FBH	366	zones_size[ZONE_HIGHMEM] = highend_pfn - highstart_pfn;
	367
	368	if (cpu_has_dc_aliases && zones_size[ZONE_HIGHMEM]) {
	369	printk(KERN_WARNING "This processor doesn't support highmem."
	370	" %ldk highmem ignored\n", zones_size[ZONE_HIGHMEM]);
	371	zones_size[ZONE_HIGHMEM] = 0;
	372	}
1da177e4 LT	373	#endif
1da177e4 LT	374
565200a1	375	#ifdef CONFIG_FLATMEM
1da177e4	376	free_area_init(zones_size);
565200a1	377	#else
80e89593	378	pfn = min_low_pfn;
565200a1 AN	379	for (i = 0; i < MAX_NR_ZONES; i++)
	380	for (j = 0; j < zones_size[i]; j++, pfn++)
	381	if (!page_is_ram(pfn))
	382	zholes_size[i]++;
	383	free_area_init_node(0, NODE_DATA(0), zones_size, 0, zholes_size);
	384	#endif
1da177e4 LT	385	}
1da177e4 LT	386
3d503753 DJ	387	static struct kcore_list kcore_mem, kcore_vmalloc;
	388	#ifdef CONFIG_64BIT
	389	static struct kcore_list kcore_kseg0;
	390	#endif
	391
1da177e4 LT	392	void __init mem_init(void)
	393	{
	394	unsigned long codesize, reservedpages, datasize, initsize;
	395	unsigned long tmp, ram;
	396
	397	#ifdef CONFIG_HIGHMEM
	398	#ifdef CONFIG_DISCONTIGMEM
	399	#error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
	400	#endif
565200a1	401	max_mapnr = highend_pfn;
1da177e4	402	#else
565200a1	403	max_mapnr = max_low_pfn;
1da177e4 LT	404	#endif
	405	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
	406
	407	totalram_pages += free_all_bootmem();
	408	totalram_pages -= setup_zero_pages(); /* Setup zeroed pages. */
	409
	410	reservedpages = ram = 0;
	411	for (tmp = 0; tmp < max_low_pfn; tmp++)
	412	if (page_is_ram(tmp)) {
	413	ram++;
b1c231f5	414	if (PageReserved(pfn_to_page(tmp)))
1da177e4 LT	415	reservedpages++;
1da177e4 LT	416	}
565200a1	417	num_physpages = ram;
1da177e4 LT	418
	419	#ifdef CONFIG_HIGHMEM
	420	for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
	421	struct page *page = mem_map + tmp;
	422
	423	if (!page_is_ram(tmp)) {
	424	SetPageReserved(page);
	425	continue;
	426	}
	427	ClearPageReserved(page);
7835e98b	428	init_page_count(page);
1da177e4 LT	429	__free_page(page);
	430	totalhigh_pages++;
	431	}
	432	totalram_pages += totalhigh_pages;
565200a1	433	num_physpages += totalhigh_pages;
1da177e4 LT	434	#endif
	435
	436	codesize = (unsigned long) &_etext - (unsigned long) &_text;
	437	datasize = (unsigned long) &_edata - (unsigned long) &_etext;
	438	initsize = (unsigned long) &__init_end - (unsigned long) &__init_begin;
	439
3d503753 DJ	440	#ifdef CONFIG_64BIT
	441	if ((unsigned long) &_text > (unsigned long) CKSEG0)
	442	/* The -4 is a hack so that user tools don't have to handle
	443	the overflow. */
	444	kclist_add(&kcore_kseg0, (void *) CKSEG0, 0x80000000 - 4);
	445	#endif
	446	kclist_add(&kcore_mem, __va(0), max_low_pfn << PAGE_SHIFT);
	447	kclist_add(&kcore_vmalloc, (void *)VMALLOC_START,
	448	VMALLOC_END-VMALLOC_START);
	449
1da177e4 LT	450	printk(KERN_INFO "Memory: %luk/%luk available (%ldk kernel code, "
	451	"%ldk reserved, %ldk data, %ldk init, %ldk highmem)\n",
	452	(unsigned long) nr_free_pages() << (PAGE_SHIFT-10),
	453	ram << (PAGE_SHIFT-10),
	454	codesize >> 10,
	455	reservedpages << (PAGE_SHIFT-10),
	456	datasize >> 10,
	457	initsize >> 10,
	458	(unsigned long) (totalhigh_pages << (PAGE_SHIFT-10)));
	459	}
b4819b59	460	#endif /* !CONFIG_NEED_MULTIPLE_NODES */
1da177e4	461
c44e8d5e	462	void free_init_pages(const char *what, unsigned long begin, unsigned long end)
6fd11a21	463	{
acd86b86	464	unsigned long pfn;
6fd11a21	465
acd86b86 FBH	466	for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
	467	struct page *page = pfn_to_page(pfn);
	468	void *addr = phys_to_virt(PFN_PHYS(pfn));
	469
	470	ClearPageReserved(page);
	471	init_page_count(page);
	472	memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
	473	__free_page(page);
6fd11a21 RB	474	totalram_pages++;
	475	}
	476	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
	477	}
	478
1da177e4 LT	479	#ifdef CONFIG_BLK_DEV_INITRD
	480	void free_initrd_mem(unsigned long start, unsigned long end)
	481	{
acd86b86 FBH	482	free_init_pages("initrd memory",
	483	virt_to_phys((void *)start),
	484	virt_to_phys((void *)end));
1da177e4 LT	485	}
	486	#endif
	487
fb4bb133	488	void __init_refok free_initmem(void)
1da177e4	489	{
c44e8d5e	490	prom_free_prom_memory();
acd86b86 FBH	491	free_init_pages("unused kernel memory",
	492	__pa_symbol(&__init_begin),
	493	__pa_symbol(&__init_end));
1da177e4	494	}
69a6c312 AN	495
	496	unsigned long pgd_current[NR_CPUS];
	497	/*
	498	* On 64-bit we've got three-level pagetables with a slightly
	499	* different layout ...
	500	*/
	501	#define __page_aligned(order) __attribute__((__aligned__(PAGE_SIZE<<order)))
9975e77d RB	502
	503	/*
	504	* gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
	505	* are constants. So we use the variants from asm-offset.h until that gcc
	506	* will officially be retired.
	507	*/
	508	pgd_t swapper_pg_dir[_PTRS_PER_PGD] __page_aligned(_PGD_ORDER);
69a6c312 AN	509	#ifdef CONFIG_64BIT
	510	#ifdef MODULE_START
	511	pgd_t module_pg_dir[PTRS_PER_PGD] __page_aligned(PGD_ORDER);
	512	#endif
	513	pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned(PMD_ORDER);
	514	#endif
	515	pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned(PTE_ORDER);