[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/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);

unsigned long highstart_pfn, highend_pfn;

/*
 * 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

static inline 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)))

static inline 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_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
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
extern void pagetable_init(void);

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, };
	unsigned long max_dma, low;
#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();

	max_dma = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
	low = max_low_pfn;

#ifdef CONFIG_ISA
	if (low < max_dma)
		zones_size[ZONE_DMA] = low;
	else {
		zones_size[ZONE_DMA] = max_dma;
		zones_size[ZONE_NORMAL] = low - max_dma;
	}
#else
	zones_size[ZONE_DMA] = low;
#endif
#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 = 0;
	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 */

static void free_init_pages(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

extern unsigned long prom_free_prom_memory(void);

void free_initmem(void)
{
	unsigned long freed;

	freed = prom_free_prom_memory();
	if (freed)
		printk(KERN_INFO "Freeing firmware memory: %ldk freed\n",freed);

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