[deliverable/linux.git] / arch / powerpc / mm / pgtable_32.c

/*
 * This file contains the routines setting up the linux page tables.
 *  -- paulus
 *
 *  Derived from arch/ppc/mm/init.c:
 *    Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
 *
 *  Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
 *  and Cort Dougan (PReP) (cort@cs.nmt.edu)
 *    Copyright (C) 1996 Paul Mackerras
 *
 *  Derived from "arch/i386/mm/init.c"
 *    Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
 *
 *  This program is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  as published by the Free Software Foundation; either version
 *  2 of the License, or (at your option) any later version.
 *
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/init.h>
#include <linux/highmem.h>
#include <linux/memblock.h>
#include <linux/slab.h>

#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/fixmap.h>
#include <asm/io.h>
#include <asm/setup.h>

#include "mmu_decl.h"

unsigned long ioremap_base;
unsigned long ioremap_bot;
EXPORT_SYMBOL(ioremap_bot);	/* aka VMALLOC_END */

extern char etext[], _stext[];

#define PGDIR_ORDER	(32 + PGD_T_LOG2 - PGDIR_SHIFT)

#ifndef CONFIG_PPC_4K_PAGES
static struct kmem_cache *pgtable_cache;

void pgtable_cache_init(void)
{
	pgtable_cache = kmem_cache_create("PGDIR cache", 1 << PGDIR_ORDER,
					  1 << PGDIR_ORDER, 0, NULL);
	if (pgtable_cache == NULL)
		panic("Couldn't allocate pgtable caches");
}
#endif

pgd_t *pgd_alloc(struct mm_struct *mm)
{
	pgd_t *ret;

	/* pgdir take page or two with 4K pages and a page fraction otherwise */
#ifndef CONFIG_PPC_4K_PAGES
	ret = kmem_cache_alloc(pgtable_cache, GFP_KERNEL | __GFP_ZERO);
#else
	ret = (pgd_t *)__get_free_pages(GFP_KERNEL|__GFP_ZERO,
			PGDIR_ORDER - PAGE_SHIFT);
#endif
	return ret;
}

void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
#ifndef CONFIG_PPC_4K_PAGES
	kmem_cache_free(pgtable_cache, (void *)pgd);
#else
	free_pages((unsigned long)pgd, PGDIR_ORDER - PAGE_SHIFT);
#endif
}

__init_refok pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
{
	pte_t *pte;

	if (slab_is_available()) {
		pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
	} else {
		pte = __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE));
		if (pte)
			clear_page(pte);
	}
	return pte;
}

pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
{
	struct page *ptepage;

	gfp_t flags = GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO;

	ptepage = alloc_pages(flags, 0);
	if (!ptepage)
		return NULL;
	if (!pgtable_page_ctor(ptepage)) {
		__free_page(ptepage);
		return NULL;
	}
	return ptepage;
}

void __iomem *
ioremap(phys_addr_t addr, unsigned long size)
{
	return __ioremap_caller(addr, size, _PAGE_NO_CACHE | _PAGE_GUARDED,
				__builtin_return_address(0));
}
EXPORT_SYMBOL(ioremap);

void __iomem *
ioremap_wc(phys_addr_t addr, unsigned long size)
{
	return __ioremap_caller(addr, size, _PAGE_NO_CACHE,
				__builtin_return_address(0));
}
EXPORT_SYMBOL(ioremap_wc);

void __iomem *
ioremap_prot(phys_addr_t addr, unsigned long size, unsigned long flags)
{
	/* writeable implies dirty for kernel addresses */
	if ((flags & (_PAGE_RW | _PAGE_RO)) != _PAGE_RO)
		flags |= _PAGE_DIRTY | _PAGE_HWWRITE;

	/* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */
	flags &= ~(_PAGE_USER | _PAGE_EXEC);

#ifdef _PAGE_BAP_SR
	/* _PAGE_USER contains _PAGE_BAP_SR on BookE using the new PTE format
	 * which means that we just cleared supervisor access... oops ;-) This
	 * restores it
	 */
	flags |= _PAGE_BAP_SR;
#endif

	return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
}
EXPORT_SYMBOL(ioremap_prot);

void __iomem *
__ioremap(phys_addr_t addr, unsigned long size, unsigned long flags)
{
	return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
}

void __iomem *
__ioremap_caller(phys_addr_t addr, unsigned long size, unsigned long flags,
		 void *caller)
{
	unsigned long v, i;
	phys_addr_t p;
	int err;

	/* Make sure we have the base flags */
	if ((flags & _PAGE_PRESENT) == 0)
		flags |= pgprot_val(PAGE_KERNEL);

	/* Non-cacheable page cannot be coherent */
	if (flags & _PAGE_NO_CACHE)
		flags &= ~_PAGE_COHERENT;

	/*
	 * Choose an address to map it to.
	 * Once the vmalloc system is running, we use it.
	 * Before then, we use space going down from ioremap_base
	 * (ioremap_bot records where we're up to).
	 */
	p = addr & PAGE_MASK;
	size = PAGE_ALIGN(addr + size) - p;

	/*
	 * If the address lies within the first 16 MB, assume it's in ISA
	 * memory space
	 */
	if (p < 16*1024*1024)
		p += _ISA_MEM_BASE;

#ifndef CONFIG_CRASH_DUMP
	/*
	 * Don't allow anybody to remap normal RAM that we're using.
	 * mem_init() sets high_memory so only do the check after that.
	 */
	if (slab_is_available() && (p < virt_to_phys(high_memory)) &&
	    !(__allow_ioremap_reserved && memblock_is_region_reserved(p, size))) {
		printk("__ioremap(): phys addr 0x%llx is RAM lr %ps\n",
		       (unsigned long long)p, __builtin_return_address(0));
		return NULL;
	}
#endif

	if (size == 0)
		return NULL;

	/*
	 * Is it already mapped?  Perhaps overlapped by a previous
	 * mapping.
	 */
	v = p_block_mapped(p);
	if (v)
		goto out;

	if (slab_is_available()) {
		struct vm_struct *area;
		area = get_vm_area_caller(size, VM_IOREMAP, caller);
		if (area == 0)
			return NULL;
		area->phys_addr = p;
		v = (unsigned long) area->addr;
	} else {
		v = (ioremap_bot -= size);
	}

	/*
	 * Should check if it is a candidate for a BAT mapping
	 */

	err = 0;
	for (i = 0; i < size && err == 0; i += PAGE_SIZE)
		err = map_page(v+i, p+i, flags);
	if (err) {
		if (slab_is_available())
			vunmap((void *)v);
		return NULL;
	}

out:
	return (void __iomem *) (v + ((unsigned long)addr & ~PAGE_MASK));
}
EXPORT_SYMBOL(__ioremap);

void iounmap(volatile void __iomem *addr)
{
	/*
	 * If mapped by BATs then there is nothing to do.
	 * Calling vfree() generates a benign warning.
	 */
	if (v_block_mapped((unsigned long)addr))
		return;

	if (addr > high_memory && (unsigned long) addr < ioremap_bot)
		vunmap((void *) (PAGE_MASK & (unsigned long)addr));
}
EXPORT_SYMBOL(iounmap);

int map_page(unsigned long va, phys_addr_t pa, int flags)
{
	pmd_t *pd;
	pte_t *pg;
	int err = -ENOMEM;

	/* Use upper 10 bits of VA to index the first level map */
	pd = pmd_offset(pud_offset(pgd_offset_k(va), va), va);
	/* Use middle 10 bits of VA to index the second-level map */
	pg = pte_alloc_kernel(pd, va);
	if (pg != 0) {
		err = 0;
		/* The PTE should never be already set nor present in the
		 * hash table
		 */
		BUG_ON((pte_val(*pg) & (_PAGE_PRESENT | _PAGE_HASHPTE)) &&
		       flags);
		set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT,
						     __pgprot(flags)));
	}
	smp_wmb();
	return err;
}

/*
 * Map in a chunk of physical memory starting at start.
 */
void __init __mapin_ram_chunk(unsigned long offset, unsigned long top)
{
	unsigned long v, s, f;
	phys_addr_t p;
	int ktext;

	s = offset;
	v = PAGE_OFFSET + s;
	p = memstart_addr + s;
	for (; s < top; s += PAGE_SIZE) {
		ktext = ((char *) v >= _stext && (char *) v < etext);
		f = ktext ? pgprot_val(PAGE_KERNEL_TEXT) : pgprot_val(PAGE_KERNEL);
		map_page(v, p, f);
#ifdef CONFIG_PPC_STD_MMU_32
		if (ktext)
			hash_preload(&init_mm, v, 0, 0x300);
#endif
		v += PAGE_SIZE;
		p += PAGE_SIZE;
	}
}

void __init mapin_ram(void)
{
	unsigned long s, top;

#ifndef CONFIG_WII
	top = total_lowmem;
	s = mmu_mapin_ram(top);
	__mapin_ram_chunk(s, top);
#else
	if (!wii_hole_size) {
		s = mmu_mapin_ram(total_lowmem);
		__mapin_ram_chunk(s, total_lowmem);
	} else {
		top = wii_hole_start;
		s = mmu_mapin_ram(top);
		__mapin_ram_chunk(s, top);

		top = memblock_end_of_DRAM();
		s = wii_mmu_mapin_mem2(top);
		__mapin_ram_chunk(s, top);
	}
#endif
}

/* Scan the real Linux page tables and return a PTE pointer for
 * a virtual address in a context.
 * Returns true (1) if PTE was found, zero otherwise.  The pointer to
 * the PTE pointer is unmodified if PTE is not found.
 */
int
get_pteptr(struct mm_struct *mm, unsigned long addr, pte_t **ptep, pmd_t **pmdp)
{
        pgd_t	*pgd;
	pud_t	*pud;
        pmd_t	*pmd;
        pte_t	*pte;
        int     retval = 0;

        pgd = pgd_offset(mm, addr & PAGE_MASK);
        if (pgd) {
		pud = pud_offset(pgd, addr & PAGE_MASK);
		if (pud && pud_present(*pud)) {
			pmd = pmd_offset(pud, addr & PAGE_MASK);
			if (pmd_present(*pmd)) {
				pte = pte_offset_map(pmd, addr & PAGE_MASK);
				if (pte) {
					retval = 1;
					*ptep = pte;
					if (pmdp)
						*pmdp = pmd;
					/* XXX caller needs to do pte_unmap, yuck */
				}
			}
		}
        }
        return(retval);
}

#ifdef CONFIG_DEBUG_PAGEALLOC

static int __change_page_attr(struct page *page, pgprot_t prot)
{
	pte_t *kpte;
	pmd_t *kpmd;
	unsigned long address;

	BUG_ON(PageHighMem(page));
	address = (unsigned long)page_address(page);

	if (v_block_mapped(address))
		return 0;
	if (!get_pteptr(&init_mm, address, &kpte, &kpmd))
		return -EINVAL;
	__set_pte_at(&init_mm, address, kpte, mk_pte(page, prot), 0);
	wmb();
	flush_tlb_page(NULL, address);
	pte_unmap(kpte);

	return 0;
}

/*
 * Change the page attributes of an page in the linear mapping.
 *
 * THIS CONFLICTS WITH BAT MAPPINGS, DEBUG USE ONLY
 */
static int change_page_attr(struct page *page, int numpages, pgprot_t prot)
{
	int i, err = 0;
	unsigned long flags;

	local_irq_save(flags);
	for (i = 0; i < numpages; i++, page++) {
		err = __change_page_attr(page, prot);
		if (err)
			break;
	}
	local_irq_restore(flags);
	return err;
}


void __kernel_map_pages(struct page *page, int numpages, int enable)
{
	if (PageHighMem(page))
		return;

	change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0));
}
#endif /* CONFIG_DEBUG_PAGEALLOC */

static int fixmaps;

void __set_fixmap (enum fixed_addresses idx, phys_addr_t phys, pgprot_t flags)
{
	unsigned long address = __fix_to_virt(idx);

	if (idx >= __end_of_fixed_addresses) {
		BUG();
		return;
	}

	map_page(address, phys, pgprot_val(flags));
	fixmaps++;
}

void __this_fixmap_does_not_exist(void)
{
	WARN_ON(1);
}
Commit	Line	Data
14cf11af PM	1	/*
	2	* This file contains the routines setting up the linux page tables.
	3	* -- paulus
	4	*
	5	* Derived from arch/ppc/mm/init.c:
	6	* Copyright (C) 1995-1996 Gary Thomas (gdt@linuxppc.org)
	7	*
	8	* Modifications by Paul Mackerras (PowerMac) (paulus@cs.anu.edu.au)
	9	* and Cort Dougan (PReP) (cort@cs.nmt.edu)
	10	* Copyright (C) 1996 Paul Mackerras
14cf11af PM	11	*
	12	* Derived from "arch/i386/mm/init.c"
	13	* Copyright (C) 1991, 1992, 1993, 1994 Linus Torvalds
	14	*
	15	* This program is free software; you can redistribute it and/or
	16	* modify it under the terms of the GNU General Public License
	17	* as published by the Free Software Foundation; either version
	18	* 2 of the License, or (at your option) any later version.
	19	*
	20	*/
	21
14cf11af PM	22	#include <linux/kernel.h>
	23	#include <linux/module.h>
	24	#include <linux/types.h>
	25	#include <linux/mm.h>
	26	#include <linux/vmalloc.h>
	27	#include <linux/init.h>
	28	#include <linux/highmem.h>
95f72d1e	29	#include <linux/memblock.h>
5a0e3ad6	30	#include <linux/slab.h>
14cf11af PM	31
	32	#include <asm/pgtable.h>
	33	#include <asm/pgalloc.h>
2c419bde	34	#include <asm/fixmap.h>
14cf11af	35	#include <asm/io.h>
ae3a197e	36	#include <asm/setup.h>
14cf11af PM	37
	38	#include "mmu_decl.h"
	39
	40	unsigned long ioremap_base;
	41	unsigned long ioremap_bot;
920573bd	42	EXPORT_SYMBOL(ioremap_bot); /* aka VMALLOC_END */
14cf11af	43
14cf11af PM	44	extern char etext[], _stext[];
14cf11af PM	45
ca9153a3	46	#define PGDIR_ORDER (32 + PGD_T_LOG2 - PGDIR_SHIFT)
14cf11af	47
ce67f5d0 LC	48	#ifndef CONFIG_PPC_4K_PAGES
	49	static struct kmem_cache *pgtable_cache;
	50
	51	void pgtable_cache_init(void)
	52	{
	53	pgtable_cache = kmem_cache_create("PGDIR cache", 1 << PGDIR_ORDER,
	54	1 << PGDIR_ORDER, 0, NULL);
	55	if (pgtable_cache == NULL)
	56	panic("Couldn't allocate pgtable caches");
	57	}
	58	#endif
	59
14cf11af PM	60	pgd_t pgd_alloc(struct mm_struct mm)
	61	{
	62	pgd_t *ret;
	63
ca9153a3 IY	64	/* pgdir take page or two with 4K pages and a page fraction otherwise */
ca9153a3 IY	65	#ifndef CONFIG_PPC_4K_PAGES
ce67f5d0	66	ret = kmem_cache_alloc(pgtable_cache, GFP_KERNEL \| __GFP_ZERO);
ca9153a3 IY	67	#else
	68	ret = (pgd_t *)__get_free_pages(GFP_KERNEL\|__GFP_ZERO,
	69	PGDIR_ORDER - PAGE_SHIFT);
	70	#endif
14cf11af PM	71	return ret;
	72	}
	73
5e541973	74	void pgd_free(struct mm_struct mm, pgd_t pgd)
14cf11af	75	{
ca9153a3	76	#ifndef CONFIG_PPC_4K_PAGES
ce67f5d0	77	kmem_cache_free(pgtable_cache, (void *)pgd);
ca9153a3 IY	78	#else
	79	free_pages((unsigned long)pgd, PGDIR_ORDER - PAGE_SHIFT);
	80	#endif
14cf11af PM	81	}
14cf11af PM	82
f1aed924	83	__init_refok pte_t pte_alloc_one_kernel(struct mm_struct mm, unsigned long address)
14cf11af PM	84	{
14cf11af PM	85	pte_t *pte;
14cf11af	86
f691fa10	87	if (slab_is_available()) {
14cf11af PM	88	pte = (pte_t *)__get_free_page(GFP_KERNEL\|__GFP_REPEAT\|__GFP_ZERO);
14cf11af PM	89	} else {
10239733	90	pte = __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE));
14cf11af PM	91	if (pte)
	92	clear_page(pte);
	93	}
	94	return pte;
	95	}
	96
2f569afd	97	pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
14cf11af PM	98	{
	99	struct page *ptepage;
	100
2f569afd	101	gfp_t flags = GFP_KERNEL \| __GFP_REPEAT \| __GFP_ZERO;
14cf11af PM	102
14cf11af PM	103	ptepage = alloc_pages(flags, 0);
2f569afd MS	104	if (!ptepage)
2f569afd MS	105	return NULL;
4f804943 KS	106	if (!pgtable_page_ctor(ptepage)) {
	107	__free_page(ptepage);
	108	return NULL;
	109	}
14cf11af PM	110	return ptepage;
	111	}
	112
14cf11af PM	113	void __iomem *
	114	ioremap(phys_addr_t addr, unsigned long size)
	115	{
1cdab55d BH	116	return __ioremap_caller(addr, size, _PAGE_NO_CACHE \| _PAGE_GUARDED,
1cdab55d BH	117	__builtin_return_address(0));
14cf11af	118	}
920573bd	119	EXPORT_SYMBOL(ioremap);
14cf11af	120
be135f40 AB	121	void __iomem *
	122	ioremap_wc(phys_addr_t addr, unsigned long size)
	123	{
	124	return __ioremap_caller(addr, size, _PAGE_NO_CACHE,
	125	__builtin_return_address(0));
	126	}
	127	EXPORT_SYMBOL(ioremap_wc);
	128
68a64357	129	void __iomem *
40f1ce7f	130	ioremap_prot(phys_addr_t addr, unsigned long size, unsigned long flags)
68a64357	131	{
a1f242ff	132	/* writeable implies dirty for kernel addresses */
a7b9f671	133	if ((flags & (_PAGE_RW \| _PAGE_RO)) != _PAGE_RO)
a1f242ff BH	134	flags \|= _PAGE_DIRTY \| _PAGE_HWWRITE;
	135
	136	/* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */
ea3cc330	137	flags &= ~(_PAGE_USER \| _PAGE_EXEC);
a1f242ff	138
55052eec BH	139	#ifdef _PAGE_BAP_SR
	140	/* _PAGE_USER contains _PAGE_BAP_SR on BookE using the new PTE format
	141	* which means that we just cleared supervisor access... oops ;-) This
	142	* restores it
	143	*/
	144	flags \|= _PAGE_BAP_SR;
	145	#endif
	146
1cdab55d	147	return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
68a64357	148	}
40f1ce7f	149	EXPORT_SYMBOL(ioremap_prot);
68a64357	150
14cf11af PM	151	void __iomem *
14cf11af PM	152	__ioremap(phys_addr_t addr, unsigned long size, unsigned long flags)
1cdab55d BH	153	{
	154	return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
	155	}
	156
	157	void __iomem *
	158	__ioremap_caller(phys_addr_t addr, unsigned long size, unsigned long flags,
	159	void *caller)
14cf11af PM	160	{
	161	unsigned long v, i;
	162	phys_addr_t p;
	163	int err;
	164
a1f242ff BH	165	/* Make sure we have the base flags */
a1f242ff BH	166	if ((flags & _PAGE_PRESENT) == 0)
4f9c53c8	167	flags \|= pgprot_val(PAGE_KERNEL);
a1f242ff BH	168
	169	/* Non-cacheable page cannot be coherent */
	170	if (flags & _PAGE_NO_CACHE)
	171	flags &= ~_PAGE_COHERENT;
	172
14cf11af PM	173	/*
	174	* Choose an address to map it to.
	175	* Once the vmalloc system is running, we use it.
	176	* Before then, we use space going down from ioremap_base
	177	* (ioremap_bot records where we're up to).
	178	*/
	179	p = addr & PAGE_MASK;
	180	size = PAGE_ALIGN(addr + size) - p;
	181
	182	/*
	183	* If the address lies within the first 16 MB, assume it's in ISA
	184	* memory space
	185	*/
	186	if (p < 1610241024)
	187	p += _ISA_MEM_BASE;
	188
01695a96	189	#ifndef CONFIG_CRASH_DUMP
14cf11af PM	190	/*
	191	* Don't allow anybody to remap normal RAM that we're using.
	192	* mem_init() sets high_memory so only do the check after that.
	193	*/
f691fa10	194	if (slab_is_available() && (p < virt_to_phys(high_memory)) &&
95f72d1e	195	!(__allow_ioremap_reserved && memblock_is_region_reserved(p, size))) {
cc83458d	196	printk("__ioremap(): phys addr 0x%llx is RAM lr %ps\n",
37f01d64	197	(unsigned long long)p, __builtin_return_address(0));
14cf11af PM	198	return NULL;
14cf11af PM	199	}
01695a96	200	#endif
14cf11af PM	201
	202	if (size == 0)
	203	return NULL;
	204
	205	/*
	206	* Is it already mapped? Perhaps overlapped by a previous
3084cdb7	207	* mapping.
14cf11af	208	*/
3084cdb7 CL	209	v = p_block_mapped(p);
3084cdb7 CL	210	if (v)
14cf11af PM	211	goto out;
14cf11af PM	212
f691fa10	213	if (slab_is_available()) {
14cf11af	214	struct vm_struct *area;
1cdab55d	215	area = get_vm_area_caller(size, VM_IOREMAP, caller);
14cf11af PM	216	if (area == 0)
14cf11af PM	217	return NULL;
7a9d1256	218	area->phys_addr = p;
14cf11af PM	219	v = (unsigned long) area->addr;
	220	} else {
	221	v = (ioremap_bot -= size);
	222	}
	223
14cf11af PM	224	/*
	225	* Should check if it is a candidate for a BAT mapping
	226	*/
	227
	228	err = 0;
	229	for (i = 0; i < size && err == 0; i += PAGE_SIZE)
	230	err = map_page(v+i, p+i, flags);
	231	if (err) {
f691fa10	232	if (slab_is_available())
14cf11af PM	233	vunmap((void *)v);
	234	return NULL;
	235	}
	236
	237	out:
	238	return (void __iomem *) (v + ((unsigned long)addr & ~PAGE_MASK));
	239	}
920573bd	240	EXPORT_SYMBOL(__ioremap);
14cf11af PM	241
	242	void iounmap(volatile void __iomem *addr)
	243	{
	244	/*
	245	* If mapped by BATs then there is nothing to do.
	246	* Calling vfree() generates a benign warning.
	247	*/
3084cdb7 CL	248	if (v_block_mapped((unsigned long)addr))
3084cdb7 CL	249	return;
14cf11af PM	250
	251	if (addr > high_memory && (unsigned long) addr < ioremap_bot)
	252	vunmap((void *) (PAGE_MASK & (unsigned long)addr));
	253	}
920573bd	254	EXPORT_SYMBOL(iounmap);
14cf11af	255
68a64357	256	int map_page(unsigned long va, phys_addr_t pa, int flags)
14cf11af PM	257	{
	258	pmd_t *pd;
	259	pte_t *pg;
	260	int err = -ENOMEM;
	261
14cf11af	262	/* Use upper 10 bits of VA to index the first level map */
d1953c88	263	pd = pmd_offset(pud_offset(pgd_offset_k(va), va), va);
14cf11af	264	/* Use middle 10 bits of VA to index the second-level map */
e2f2e58e	265	pg = pte_alloc_kernel(pd, va);
14cf11af PM	266	if (pg != 0) {
14cf11af PM	267	err = 0;
3be4e699 BH	268	/* The PTE should never be already set nor present in the
	269	* hash table
	270	*/
7021d86a AV	271	BUG_ON((pte_val(*pg) & (_PAGE_PRESENT \| _PAGE_HASHPTE)) &&
7021d86a AV	272	flags);
3be4e699 BH	273	set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT,
3be4e699 BH	274	__pgprot(flags)));
14cf11af	275	}
47ce8af4	276	smp_wmb();
14cf11af PM	277	return err;
	278	}
	279
	280	/*
de32400d	281	* Map in a chunk of physical memory starting at start.
14cf11af	282	*/
de32400d	283	void __init __mapin_ram_chunk(unsigned long offset, unsigned long top)
14cf11af	284	{
99c62dd7 KG	285	unsigned long v, s, f;
99c62dd7 KG	286	phys_addr_t p;
ee4f2ea4	287	int ktext;
14cf11af	288
de32400d	289	s = offset;
ccdcef72	290	v = PAGE_OFFSET + s;
99c62dd7	291	p = memstart_addr + s;
de32400d	292	for (; s < top; s += PAGE_SIZE) {
ee4f2ea4	293	ktext = ((char ) v >= _stext && (char ) v < etext);
4f9c53c8	294	f = ktext ? pgprot_val(PAGE_KERNEL_TEXT) : pgprot_val(PAGE_KERNEL);
14cf11af	295	map_page(v, p, f);
ee4f2ea4 BH	296	#ifdef CONFIG_PPC_STD_MMU_32
	297	if (ktext)
	298	hash_preload(&init_mm, v, 0, 0x300);
	299	#endif
14cf11af PM	300	v += PAGE_SIZE;
	301	p += PAGE_SIZE;
	302	}
	303	}
	304
de32400d AH	305	void __init mapin_ram(void)
	306	{
	307	unsigned long s, top;
	308
	309	#ifndef CONFIG_WII
	310	top = total_lowmem;
	311	s = mmu_mapin_ram(top);
	312	__mapin_ram_chunk(s, top);
	313	#else
	314	if (!wii_hole_size) {
	315	s = mmu_mapin_ram(total_lowmem);
	316	__mapin_ram_chunk(s, total_lowmem);
	317	} else {
	318	top = wii_hole_start;
	319	s = mmu_mapin_ram(top);
	320	__mapin_ram_chunk(s, top);
	321
95f72d1e	322	top = memblock_end_of_DRAM();
de32400d AH	323	s = wii_mmu_mapin_mem2(top);
	324	__mapin_ram_chunk(s, top);
	325	}
	326	#endif
	327	}
	328
14cf11af PM	329	/* Scan the real Linux page tables and return a PTE pointer for
	330	* a virtual address in a context.
	331	* Returns true (1) if PTE was found, zero otherwise. The pointer to
	332	* the PTE pointer is unmodified if PTE is not found.
	333	*/
	334	int
bab70a4a	335	get_pteptr(struct mm_struct mm, unsigned long addr, pte_t ptep, pmd_t *pmdp)
14cf11af PM	336	{
14cf11af PM	337	pgd_t *pgd;
d1953c88	338	pud_t *pud;
14cf11af PM	339	pmd_t *pmd;
	340	pte_t *pte;
	341	int retval = 0;
	342
	343	pgd = pgd_offset(mm, addr & PAGE_MASK);
	344	if (pgd) {
d1953c88 DG	345	pud = pud_offset(pgd, addr & PAGE_MASK);
	346	if (pud && pud_present(*pud)) {
	347	pmd = pmd_offset(pud, addr & PAGE_MASK);
	348	if (pmd_present(*pmd)) {
	349	pte = pte_offset_map(pmd, addr & PAGE_MASK);
	350	if (pte) {
	351	retval = 1;
	352	*ptep = pte;
	353	if (pmdp)
	354	*pmdp = pmd;
	355	/* XXX caller needs to do pte_unmap, yuck */
	356	}
	357	}
	358	}
14cf11af PM	359	}
	360	return(retval);
	361	}
	362
88df6e90 BH	363	#ifdef CONFIG_DEBUG_PAGEALLOC
	364
	365	static int __change_page_attr(struct page *page, pgprot_t prot)
	366	{
	367	pte_t *kpte;
	368	pmd_t *kpmd;
	369	unsigned long address;
	370
	371	BUG_ON(PageHighMem(page));
	372	address = (unsigned long)page_address(page);
	373
3084cdb7	374	if (v_block_mapped(address))
88df6e90 BH	375	return 0;
	376	if (!get_pteptr(&init_mm, address, &kpte, &kpmd))
	377	return -EINVAL;
50891457	378	__set_pte_at(&init_mm, address, kpte, mk_pte(page, prot), 0);
88df6e90	379	wmb();
f63837f0	380	flush_tlb_page(NULL, address);
88df6e90 BH	381	pte_unmap(kpte);
	382
	383	return 0;
	384	}
	385
	386	/*
	387	* Change the page attributes of an page in the linear mapping.
	388	*
	389	* THIS CONFLICTS WITH BAT MAPPINGS, DEBUG USE ONLY
	390	*/
	391	static int change_page_attr(struct page *page, int numpages, pgprot_t prot)
	392	{
	393	int i, err = 0;
	394	unsigned long flags;
	395
	396	local_irq_save(flags);
	397	for (i = 0; i < numpages; i++, page++) {
	398	err = __change_page_attr(page, prot);
	399	if (err)
	400	break;
	401	}
	402	local_irq_restore(flags);
	403	return err;
	404	}
	405
	406
031bc574	407	void __kernel_map_pages(struct page *page, int numpages, int enable)
88df6e90 BH	408	{
	409	if (PageHighMem(page))
	410	return;
	411
	412	change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0));
	413	}
	414	#endif /* CONFIG_DEBUG_PAGEALLOC */
2c419bde KG	415
2c419bde KG	416	static int fixmaps;
2c419bde KG	417
	418	void __set_fixmap (enum fixed_addresses idx, phys_addr_t phys, pgprot_t flags)
	419	{
	420	unsigned long address = __fix_to_virt(idx);
	421
	422	if (idx >= __end_of_fixed_addresses) {
	423	BUG();
	424	return;
	425	}
	426
46a74179	427	map_page(address, phys, pgprot_val(flags));
2c419bde KG	428	fixmaps++;
	429	}
	430
	431	void __this_fixmap_does_not_exist(void)
	432	{
	433	WARN_ON(1);
	434	}