[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/bug.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/smp.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 <linux/hardirq.h>
#include <linux/gfp.h>
#include <linux/kcore.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>

/*
 * 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;
EXPORT_SYMBOL_GPL(empty_zero_page);

/*
 * Not static inline because used by IP27 special magic initialization code
 */
void setup_zero_pages(void)
{
	unsigned int order, i;
	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);
	for (i = 0; i < (1 << order); i++, page++)
		mark_page_reserved(page);

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

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;

	BUG_ON(Page_dcache_dirty(page));

	pagefault_disable();
	idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
	idx += in_interrupt() ? FIX_N_COLOURS : 0;
	vaddr = __fix_to_virt(FIX_CMAP_END - idx);
	pte = mk_pte(page, PAGE_KERNEL);
#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
	entrylo = pte.pte_high;
#else
	entrylo = pte_to_entrylo(pte_val(pte));
#endif

	local_irq_save(flags);
	old_ctx = read_c0_entryhi();
	write_c0_entryhi(vaddr & (PAGE_MASK << 1));
	write_c0_entrylo0(entrylo);
	write_c0_entrylo1(entrylo);
	tlbidx = read_c0_wired();
	write_c0_wired(tlbidx + 1);
	write_c0_index(tlbidx);
	mtc0_tlbw_hazard();
	tlb_write_indexed();
	tlbw_use_hazard();
	write_c0_entryhi(old_ctx);
	local_irq_restore(flags);

	return (void*) vaddr;
}

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

	local_irq_save(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);
	local_irq_restore(flags);
	pagefault_enable();
}

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);
	if (cpu_has_dc_aliases &&
	    page_mapped(from) && !Page_dcache_dirty(from)) {
		vfrom = kmap_coherent(from, vaddr);
		copy_page(vto, vfrom);
		kunmap_coherent();
	} else {
		vfrom = kmap_atomic(from);
		copy_page(vto, vfrom);
		kunmap_atomic(vfrom);
	}
	if ((!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);
	/* Make sure this page is cleared on other CPU's too before using it */
	smp_wmb();
}

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 &&
	    page_mapped(page) && !Page_dcache_dirty(page)) {
		void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
		memcpy(vto, src, len);
		kunmap_coherent();
	} else {
		memcpy(dst, src, len);
		if (cpu_has_dc_aliases)
			SetPageDcacheDirty(page);
	}
	if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc)
		flush_cache_page(vma, vaddr, page_to_pfn(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 &&
	    page_mapped(page) && !Page_dcache_dirty(page)) {
		void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
		memcpy(dst, vfrom, len);
		kunmap_coherent();
	} else {
		memcpy(dst, src, len);
		if (cpu_has_dc_aliases)
			SetPageDcacheDirty(page);
	}
}
EXPORT_SYMBOL_GPL(copy_from_user_page);

void __init fixrange_init(unsigned long start, unsigned long end,
	pgd_t *pgd_base)
{
#ifdef CONFIG_HIGHMEM
	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));
					BUG_ON(pte != pte_offset_kernel(pmd, 0));
				}
				vaddr += PMD_SIZE;
			}
			k = 0;
		}
		j = 0;
	}
#endif
}

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

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

		switch (boot_mem_map.map[i].type) {
		case BOOT_MEM_RAM:
		case BOOT_MEM_INIT_RAM:
			break;
		default:
			/* 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 max_zone_pfns[MAX_NR_ZONES];
	unsigned long lastpfn __maybe_unused;

	pagetable_init();

#ifdef CONFIG_HIGHMEM
	kmap_init();
#endif
#ifdef CONFIG_ZONE_DMA
	max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
#endif
#ifdef CONFIG_ZONE_DMA32
	max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
#endif
	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
	lastpfn = max_low_pfn;
#ifdef CONFIG_HIGHMEM
	max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
	lastpfn = highend_pfn;

	if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
		printk(KERN_WARNING "This processor doesn't support highmem."
		       " %ldk highmem ignored\n",
		       (highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
		max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
		lastpfn = max_low_pfn;
	}
#endif

	free_area_init_nodes(max_zone_pfns);
}

#ifdef CONFIG_64BIT
static struct kcore_list kcore_kseg0;
#endif

static inline void mem_init_free_highmem(void)
{
#ifdef CONFIG_HIGHMEM
	unsigned long tmp;

	for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
		struct page *page = pfn_to_page(tmp);

		if (!page_is_ram(tmp))
			SetPageReserved(page);
		else
			free_highmem_page(page);
	}
#endif
}

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

	free_all_bootmem();
	setup_zero_pages();	/* Setup zeroed pages.  */
	mem_init_free_highmem();
	mem_init_print_info(NULL);

#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, KCORE_TEXT);
#endif
}
#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));

		memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
		free_reserved_page(page);
	}
	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_reserved_area((void *)start, (void *)end, POISON_FREE_INITMEM,
			   "initrd");
}
#endif

void (*free_init_pages_eva)(void *begin, void *end) = NULL;

void __init_refok free_initmem(void)
{
	prom_free_prom_memory();
	/*
	 * Let the platform define a specific function to free the
	 * init section since EVA may have used any possible mapping
	 * between virtual and physical addresses.
	 */
	if (free_init_pages_eva)
		free_init_pages_eva((void *)&__init_begin, (void *)&__init_end);
	else
		free_initmem_default(POISON_FREE_INITMEM);
}

#ifndef CONFIG_MIPS_PGD_C0_CONTEXT
unsigned long pgd_current[NR_CPUS];
#endif

/*
 * 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.
 *
 * Align swapper_pg_dir in to 64K, allows its address to be loaded
 * with a single LUI instruction in the TLB handlers.  If we used
 * __aligned(64K), its size would get rounded up to the alignment
 * size, and waste space.  So we place it in its own section and align
 * it in the linker script.
 */
pgd_t swapper_pg_dir[_PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
#ifndef __PAGETABLE_PMD_FOLDED
pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss;
#endif
pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;
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	*/
b868868a	11	#include <linux/bug.h>
1da177e4 LT	12	#include <linux/init.h>
	13	#include <linux/module.h>
	14	#include <linux/signal.h>
	15	#include <linux/sched.h>
631330f5	16	#include <linux/smp.h>
1da177e4 LT	17	#include <linux/kernel.h>
	18	#include <linux/errno.h>
	19	#include <linux/string.h>
	20	#include <linux/types.h>
	21	#include <linux/pagemap.h>
	22	#include <linux/ptrace.h>
	23	#include <linux/mman.h>
	24	#include <linux/mm.h>
	25	#include <linux/bootmem.h>
	26	#include <linux/highmem.h>
	27	#include <linux/swap.h>
3d503753	28	#include <linux/proc_fs.h>
22a9835c	29	#include <linux/pfn.h>
0f334a3e	30	#include <linux/hardirq.h>
5a0e3ad6	31	#include <linux/gfp.h>
2f96b8c1	32	#include <linux/kcore.h>
1da177e4	33
9975e77d	34	#include <asm/asm-offsets.h>
1da177e4 LT	35	#include <asm/bootinfo.h>
	36	#include <asm/cachectl.h>
	37	#include <asm/cpu.h>
	38	#include <asm/dma.h>
f8829cae	39	#include <asm/kmap_types.h>
1da177e4 LT	40	#include <asm/mmu_context.h>
	41	#include <asm/sections.h>
	42	#include <asm/pgtable.h>
	43	#include <asm/pgalloc.h>
	44	#include <asm/tlb.h>
f8829cae RB	45	#include <asm/fixmap.h>
f8829cae RB	46
1da177e4 LT	47	/*
1da177e4 LT	48	* We have up to 8 empty zeroed pages so we can map one of the right colour
70342287	49	* when needed. This is necessary only on R4000 / R4400 SC and MC versions
1da177e4 LT	50	* where we have to avoid VCED / VECI exceptions for good performance at
	51	* any price. Since page is never written to after the initialization we
	52	* don't have to care about aliases on other CPUs.
	53	*/
	54	unsigned long empty_zero_page, zero_page_mask;
497d2adc	55	EXPORT_SYMBOL_GPL(empty_zero_page);
1da177e4 LT	56
	57	/*
	58	* Not static inline because used by IP27 special magic initialization code
	59	*/
31605922	60	void setup_zero_pages(void)
1da177e4	61	{
31605922	62	unsigned int order, i;
1da177e4 LT	63	struct page *page;
	64
	65	if (cpu_has_vce)
	66	order = 3;
	67	else
	68	order = 0;
	69
	70	empty_zero_page = __get_free_pages(GFP_KERNEL \| __GFP_ZERO, order);
	71	if (!empty_zero_page)
	72	panic("Oh boy, that early out of memory?");
	73
99e3b942	74	page = virt_to_page((void *)empty_zero_page);
8dfcc9ba	75	split_page(page, order);
31605922 JL	76	for (i = 0; i < (1 << order); i++, page++)
31605922 JL	77	mark_page_reserved(page);
1da177e4	78
31605922	79	zero_page_mask = ((PAGE_SIZE << order) - 1) & PAGE_MASK;
1da177e4 LT	80	}
1da177e4 LT	81
7575a49f	82	void kmap_coherent(struct page page, unsigned long addr)
f8829cae RB	83	{
	84	enum fixed_addresses idx;
	85	unsigned long vaddr, flags, entrylo;
	86	unsigned long old_ctx;
	87	pte_t pte;
	88	int tlbidx;
	89
b868868a RB	90	BUG_ON(Page_dcache_dirty(page));
b868868a RB	91
bdb43806	92	pagefault_disable();
f8829cae	93	idx = (addr >> PAGE_SHIFT) & (FIX_N_COLOURS - 1);
0f334a3e	94	idx += in_interrupt() ? FIX_N_COLOURS : 0;
f8829cae RB	95	vaddr = __fix_to_virt(FIX_CMAP_END - idx);
f8829cae RB	96	pte = mk_pte(page, PAGE_KERNEL);
962f480e	97	#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
f8829cae RB	98	entrylo = pte.pte_high;
f8829cae RB	99	#else
6dd9344c	100	entrylo = pte_to_entrylo(pte_val(pte));
f8829cae RB	101	#endif
f8829cae RB	102
b633648c	103	local_irq_save(flags);
f8829cae RB	104	old_ctx = read_c0_entryhi();
	105	write_c0_entryhi(vaddr & (PAGE_MASK << 1));
	106	write_c0_entrylo0(entrylo);
	107	write_c0_entrylo1(entrylo);
f8829cae RB	108	tlbidx = read_c0_wired();
	109	write_c0_wired(tlbidx + 1);
	110	write_c0_index(tlbidx);
	111	mtc0_tlbw_hazard();
	112	tlb_write_indexed();
f8829cae RB	113	tlbw_use_hazard();
f8829cae RB	114	write_c0_entryhi(old_ctx);
b633648c	115	local_irq_restore(flags);
f8829cae RB	116
	117	return (void*) vaddr;
	118	}
	119
eacb9d61	120	void kunmap_coherent(void)
f8829cae	121	{
f8829cae RB	122	unsigned int wired;
	123	unsigned long flags, old_ctx;
	124
b633648c	125	local_irq_save(flags);
f8829cae RB	126	old_ctx = read_c0_entryhi();
	127	wired = read_c0_wired() - 1;
	128	write_c0_wired(wired);
	129	write_c0_index(wired);
	130	write_c0_entryhi(UNIQUE_ENTRYHI(wired));
	131	write_c0_entrylo0(0);
	132	write_c0_entrylo1(0);
	133	mtc0_tlbw_hazard();
	134	tlb_write_indexed();
	135	tlbw_use_hazard();
	136	write_c0_entryhi(old_ctx);
b633648c	137	local_irq_restore(flags);
bdb43806	138	pagefault_enable();
f8829cae RB	139	}
f8829cae RB	140
bcd02280 AN	141	void copy_user_highpage(struct page to, struct page from,
	142	unsigned long vaddr, struct vm_area_struct *vma)
	143	{
	144	void vfrom, vto;
	145
9c02048f	146	vto = kmap_atomic(to);
9a74b3eb RB	147	if (cpu_has_dc_aliases &&
9a74b3eb RB	148	page_mapped(from) && !Page_dcache_dirty(from)) {
bcd02280 AN	149	vfrom = kmap_coherent(from, vaddr);
bcd02280 AN	150	copy_page(vto, vfrom);
eacb9d61	151	kunmap_coherent();
bcd02280	152	} else {
9c02048f	153	vfrom = kmap_atomic(from);
bcd02280	154	copy_page(vto, vfrom);
9c02048f	155	kunmap_atomic(vfrom);
bcd02280	156	}
39b8d525	157	if ((!cpu_has_ic_fills_f_dc) \|\|
bcd02280 AN	158	pages_do_alias((unsigned long)vto, vaddr & PAGE_MASK))
bcd02280 AN	159	flush_data_cache_page((unsigned long)vto);
9c02048f	160	kunmap_atomic(vto);
bcd02280 AN	161	/* Make sure this page is cleared on other CPU's too before using it */
	162	smp_wmb();
	163	}
	164
f8829cae RB	165	void copy_to_user_page(struct vm_area_struct *vma,
	166	struct page page, unsigned long vaddr, void dst, const void *src,
	167	unsigned long len)
	168	{
9a74b3eb RB	169	if (cpu_has_dc_aliases &&
9a74b3eb RB	170	page_mapped(page) && !Page_dcache_dirty(page)) {
f8829cae RB	171	void *vto = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
f8829cae RB	172	memcpy(vto, src, len);
eacb9d61	173	kunmap_coherent();
985c30ef	174	} else {
f8829cae	175	memcpy(dst, src, len);
985c30ef RB	176	if (cpu_has_dc_aliases)
	177	SetPageDcacheDirty(page);
	178	}
f8829cae RB	179	if ((vma->vm_flags & VM_EXEC) && !cpu_has_ic_fills_f_dc)
	180	flush_cache_page(vma, vaddr, page_to_pfn(page));
	181	}
	182
f8829cae RB	183	void copy_from_user_page(struct vm_area_struct *vma,
	184	struct page page, unsigned long vaddr, void dst, const void *src,
	185	unsigned long len)
	186	{
9a74b3eb RB	187	if (cpu_has_dc_aliases &&
9a74b3eb RB	188	page_mapped(page) && !Page_dcache_dirty(page)) {
985c30ef	189	void *vfrom = kmap_coherent(page, vaddr) + (vaddr & ~PAGE_MASK);
f8829cae	190	memcpy(dst, vfrom, len);
eacb9d61	191	kunmap_coherent();
985c30ef	192	} else {
f8829cae	193	memcpy(dst, src, len);
985c30ef RB	194	if (cpu_has_dc_aliases)
	195	SetPageDcacheDirty(page);
	196	}
f8829cae	197	}
bf9621aa	198	EXPORT_SYMBOL_GPL(copy_from_user_page);
f8829cae	199
84fd089a	200	void __init fixrange_init(unsigned long start, unsigned long end,
1da177e4 LT	201	pgd_t *pgd_base)
1da177e4 LT	202	{
b633648c	203	#ifdef CONFIG_HIGHMEM
1da177e4	204	pgd_t *pgd;
c6e8b587	205	pud_t *pud;
1da177e4 LT	206	pmd_t *pmd;
1da177e4 LT	207	pte_t *pte;
c6e8b587	208	int i, j, k;
1da177e4 LT	209	unsigned long vaddr;
	210
	211	vaddr = start;
	212	i = __pgd_offset(vaddr);
c6e8b587 RB	213	j = __pud_offset(vaddr);
c6e8b587 RB	214	k = __pmd_offset(vaddr);
1da177e4 LT	215	pgd = pgd_base + i;
1da177e4 LT	216
464fd83e	217	for ( ; (i < PTRS_PER_PGD) && (vaddr < end); pgd++, i++) {
c6e8b587	218	pud = (pud_t *)pgd;
464fd83e	219	for ( ; (j < PTRS_PER_PUD) && (vaddr < end); pud++, j++) {
c6e8b587	220	pmd = (pmd_t *)pud;
464fd83e	221	for (; (k < PTRS_PER_PMD) && (vaddr < end); pmd++, k++) {
c6e8b587 RB	222	if (pmd_none(*pmd)) {
c6e8b587 RB	223	pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
f8829cae	224	set_pmd(pmd, __pmd((unsigned long)pte));
b72b7092	225	BUG_ON(pte != pte_offset_kernel(pmd, 0));
c6e8b587 RB	226	}
c6e8b587 RB	227	vaddr += PMD_SIZE;
1da177e4	228	}
c6e8b587	229	k = 0;
1da177e4 LT	230	}
	231	j = 0;
	232	}
f8829cae	233	#endif
1da177e4	234	}
1da177e4	235
b4819b59	236	#ifndef CONFIG_NEED_MULTIPLE_NODES
61ef2489	237	int page_is_ram(unsigned long pagenr)
565200a1 AN	238	{
	239	int i;
	240
	241	for (i = 0; i < boot_mem_map.nr_map; i++) {
	242	unsigned long addr, end;
	243
43064c0c DD	244	switch (boot_mem_map.map[i].type) {
	245	case BOOT_MEM_RAM:
	246	case BOOT_MEM_INIT_RAM:
	247	break;
	248	default:
565200a1 AN	249	/* not usable memory */
565200a1 AN	250	continue;
43064c0c	251	}
565200a1 AN	252
	253	addr = PFN_UP(boot_mem_map.map[i].addr);
	254	end = PFN_DOWN(boot_mem_map.map[i].addr +
	255	boot_mem_map.map[i].size);
	256
	257	if (pagenr >= addr && pagenr < end)
	258	return 1;
	259	}
	260
	261	return 0;
	262	}
	263
1da177e4 LT	264	void __init paging_init(void)
1da177e4 LT	265	{
cce335ae	266	unsigned long max_zone_pfns[MAX_NR_ZONES];
d3ce0e98	267	unsigned long lastpfn __maybe_unused;
1da177e4 LT	268
	269	pagetable_init();
	270
	271	#ifdef CONFIG_HIGHMEM
	272	kmap_init();
	273	#endif
05502339	274	#ifdef CONFIG_ZONE_DMA
cce335ae	275	max_zone_pfns[ZONE_DMA] = MAX_DMA_PFN;
1da177e4	276	#endif
cce335ae RB	277	#ifdef CONFIG_ZONE_DMA32
	278	max_zone_pfns[ZONE_DMA32] = MAX_DMA32_PFN;
	279	#endif
	280	max_zone_pfns[ZONE_NORMAL] = max_low_pfn;
	281	lastpfn = max_low_pfn;
1da177e4	282	#ifdef CONFIG_HIGHMEM
cce335ae RB	283	max_zone_pfns[ZONE_HIGHMEM] = highend_pfn;
cce335ae RB	284	lastpfn = highend_pfn;
cbb8fc07	285
cce335ae	286	if (cpu_has_dc_aliases && max_low_pfn != highend_pfn) {
cbb8fc07	287	printk(KERN_WARNING "This processor doesn't support highmem."
cce335ae RB	288	" %ldk highmem ignored\n",
	289	(highend_pfn - max_low_pfn) << (PAGE_SHIFT - 10));
	290	max_zone_pfns[ZONE_HIGHMEM] = max_low_pfn;
	291	lastpfn = max_low_pfn;
cbb8fc07	292	}
1da177e4 LT	293	#endif
1da177e4 LT	294
cce335ae	295	free_area_init_nodes(max_zone_pfns);
1da177e4 LT	296	}
1da177e4 LT	297
3d503753 DJ	298	#ifdef CONFIG_64BIT
	299	static struct kcore_list kcore_kseg0;
	300	#endif
	301
1132137e	302	static inline void mem_init_free_highmem(void)
1da177e4	303	{
1132137e JL	304	#ifdef CONFIG_HIGHMEM
1132137e JL	305	unsigned long tmp;
1da177e4	306
1132137e JL	307	for (tmp = highstart_pfn; tmp < highend_pfn; tmp++) {
	308	struct page *page = pfn_to_page(tmp);
	309
	310	if (!page_is_ram(tmp))
	311	SetPageReserved(page);
	312	else
	313	free_highmem_page(page);
	314	}
	315	#endif
	316	}
	317
	318	void __init mem_init(void)
	319	{
1da177e4 LT	320	#ifdef CONFIG_HIGHMEM
	321	#ifdef CONFIG_DISCONTIGMEM
	322	#error "CONFIG_HIGHMEM and CONFIG_DISCONTIGMEM dont work together yet"
	323	#endif
b6da0ffb	324	max_mapnr = highend_pfn ? highend_pfn : max_low_pfn;
1da177e4	325	#else
565200a1	326	max_mapnr = max_low_pfn;
1da177e4 LT	327	#endif
	328	high_memory = (void *) __va(max_low_pfn << PAGE_SHIFT);
	329
0c988534	330	free_all_bootmem();
31605922	331	setup_zero_pages(); /* Setup zeroed pages. */
1132137e JL	332	mem_init_free_highmem();
1132137e JL	333	mem_init_print_info(NULL);
1da177e4	334
3d503753 DJ	335	#ifdef CONFIG_64BIT
	336	if ((unsigned long) &_text > (unsigned long) CKSEG0)
	337	/* The -4 is a hack so that user tools don't have to handle
	338	the overflow. */
c30bb2a2 KH	339	kclist_add(&kcore_kseg0, (void *) CKSEG0,
c30bb2a2 KH	340	0x80000000 - 4, KCORE_TEXT);
3d503753	341	#endif
1da177e4	342	}
b4819b59	343	#endif /* !CONFIG_NEED_MULTIPLE_NODES */
1da177e4	344
c44e8d5e	345	void free_init_pages(const char *what, unsigned long begin, unsigned long end)
6fd11a21	346	{
acd86b86	347	unsigned long pfn;
6fd11a21	348
acd86b86 FBH	349	for (pfn = PFN_UP(begin); pfn < PFN_DOWN(end); pfn++) {
	350	struct page *page = pfn_to_page(pfn);
	351	void *addr = phys_to_virt(PFN_PHYS(pfn));
	352
acd86b86	353	memset(addr, POISON_FREE_INITMEM, PAGE_SIZE);
31605922	354	free_reserved_page(page);
6fd11a21 RB	355	}
	356	printk(KERN_INFO "Freeing %s: %ldk freed\n", what, (end - begin) >> 10);
	357	}
	358
1da177e4 LT	359	#ifdef CONFIG_BLK_DEV_INITRD
	360	void free_initrd_mem(unsigned long start, unsigned long end)
	361	{
11199692 JL	362	free_reserved_area((void )start, (void )end, POISON_FREE_INITMEM,
11199692 JL	363	"initrd");
1da177e4 LT	364	}
	365	#endif
	366
0893d3fb MC	367	void (free_init_pages_eva)(void begin, void *end) = NULL;
0893d3fb MC	368
fb4bb133	369	void __init_refok free_initmem(void)
1da177e4	370	{
c44e8d5e	371	prom_free_prom_memory();
0893d3fb MC	372	/*
	373	* Let the platform define a specific function to free the
	374	* init section since EVA may have used any possible mapping
	375	* between virtual and physical addresses.
	376	*/
	377	if (free_init_pages_eva)
	378	free_init_pages_eva((void )&__init_begin, (void )&__init_end);
	379	else
	380	free_initmem_default(POISON_FREE_INITMEM);
1da177e4	381	}
69a6c312	382
82622284	383	#ifndef CONFIG_MIPS_PGD_C0_CONTEXT
69a6c312	384	unsigned long pgd_current[NR_CPUS];
82622284	385	#endif
9975e77d RB	386
	387	/*
	388	* gcc 3.3 and older have trouble determining that PTRS_PER_PGD and PGD_ORDER
	389	* are constants. So we use the variants from asm-offset.h until that gcc
	390	* will officially be retired.
485172b3 DD	391	*
	392	* Align swapper_pg_dir in to 64K, allows its address to be loaded
	393	* with a single LUI instruction in the TLB handlers. If we used
	394	* __aligned(64K), its size would get rounded up to the alignment
	395	* size, and waste space. So we place it in its own section and align
	396	* it in the linker script.
9975e77d	397	*/
485172b3	398	pgd_t swapper_pg_dir[_PTRS_PER_PGD] __section(.bss..swapper_pg_dir);
325f8a0a	399	#ifndef __PAGETABLE_PMD_FOLDED
485172b3	400	pmd_t invalid_pmd_table[PTRS_PER_PMD] __page_aligned_bss;
69a6c312	401	#endif
485172b3	402	pte_t invalid_pte_table[PTRS_PER_PTE] __page_aligned_bss;