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