[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 <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/io.h>

#include "mmu_decl.h"

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

#if defined(CONFIG_6xx) || defined(CONFIG_POWER3)
#define HAVE_BATS	1
#endif

#if defined(CONFIG_FSL_BOOKE)
#define HAVE_TLBCAM	1
#endif

extern char etext[], _stext[];

#ifdef CONFIG_SMP
extern void hash_page_sync(void);
#endif

#ifdef HAVE_BATS
extern unsigned long v_mapped_by_bats(unsigned long va);
extern unsigned long p_mapped_by_bats(unsigned long pa);
void setbat(int index, unsigned long virt, unsigned long phys,
	    unsigned int size, int flags);

#else /* !HAVE_BATS */
#define v_mapped_by_bats(x)	(0UL)
#define p_mapped_by_bats(x)	(0UL)
#endif /* HAVE_BATS */

#ifdef HAVE_TLBCAM
extern unsigned int tlbcam_index;
extern unsigned long v_mapped_by_tlbcam(unsigned long va);
extern unsigned long p_mapped_by_tlbcam(unsigned long pa);
#else /* !HAVE_TLBCAM */
#define v_mapped_by_tlbcam(x)	(0UL)
#define p_mapped_by_tlbcam(x)	(0UL)
#endif /* HAVE_TLBCAM */

#ifdef CONFIG_PTE_64BIT
/* 44x uses an 8kB pgdir because it has 8-byte Linux PTEs. */
#define PGDIR_ORDER	1
#else
#define PGDIR_ORDER	0
#endif

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

	ret = (pgd_t *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, PGDIR_ORDER);
	return ret;
}

void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
	free_pages((unsigned long)pgd, PGDIR_ORDER);
}

__init_refok pte_t *pte_alloc_one_kernel(struct mm_struct *mm, unsigned long address)
{
	pte_t *pte;
	extern int mem_init_done;
	extern void *early_get_page(void);

	if (mem_init_done) {
		pte = (pte_t *)__get_free_page(GFP_KERNEL|__GFP_REPEAT|__GFP_ZERO);
	} else {
		pte = (pte_t *)early_get_page();
		if (pte)
			clear_page(pte);
	}
	return pte;
}

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

#ifdef CONFIG_HIGHPTE
	gfp_t flags = GFP_KERNEL | __GFP_HIGHMEM | __GFP_REPEAT | __GFP_ZERO;
#else
	gfp_t flags = GFP_KERNEL | __GFP_REPEAT | __GFP_ZERO;
#endif

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

void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
{
#ifdef CONFIG_SMP
	hash_page_sync();
#endif
	free_page((unsigned long)pte);
}

void pte_free(struct mm_struct *mm, pgtable_t ptepage)
{
#ifdef CONFIG_SMP
	hash_page_sync();
#endif
	pgtable_page_dtor(ptepage);
	__free_page(ptepage);
}

void __iomem *
ioremap(phys_addr_t addr, unsigned long size)
{
	return __ioremap(addr, size, _PAGE_NO_CACHE);
}
EXPORT_SYMBOL(ioremap);

void __iomem *
ioremap_flags(phys_addr_t addr, unsigned long size, unsigned long flags)
{
	return __ioremap(addr, size, flags);
}
EXPORT_SYMBOL(ioremap_flags);

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

	/*
	 * 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;

	/*
	 * 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 (mem_init_done && (p < virt_to_phys(high_memory))) {
		printk("__ioremap(): phys addr 0x%llx is RAM lr %p\n",
		       (unsigned long long)p, __builtin_return_address(0));
		return NULL;
	}

	if (size == 0)
		return NULL;

	/*
	 * Is it already mapped?  Perhaps overlapped by a previous
	 * BAT mapping.  If the whole area is mapped then we're done,
	 * otherwise remap it since we want to keep the virt addrs for
	 * each request contiguous.
	 *
	 * We make the assumption here that if the bottom and top
	 * of the range we want are mapped then it's mapped to the
	 * same virt address (and this is contiguous).
	 *  -- Cort
	 */
	if ((v = p_mapped_by_bats(p)) /*&& p_mapped_by_bats(p+size-1)*/ )
		goto out;

	if ((v = p_mapped_by_tlbcam(p)))
		goto out;

	if (mem_init_done) {
		struct vm_struct *area;
		area = get_vm_area(size, VM_IOREMAP);
		if (area == 0)
			return NULL;
		v = (unsigned long) area->addr;
	} else {
		v = (ioremap_bot -= size);
	}

	if ((flags & _PAGE_PRESENT) == 0)
		flags |= _PAGE_KERNEL;
	if (flags & _PAGE_NO_CACHE)
		flags |= _PAGE_GUARDED;

	/*
	 * 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 (mem_init_done)
			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_mapped_by_bats((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));
		set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT,
						     __pgprot(flags)));
	}
	return err;
}

/*
 * Map in all of physical memory starting at KERNELBASE.
 */
void __init mapin_ram(void)
{
	unsigned long v, s, f;
	phys_addr_t p;
	int ktext;

	s = mmu_mapin_ram();
	v = KERNELBASE + s;
	p = memstart_addr + s;
	for (; s < total_lowmem; s += PAGE_SIZE) {
		ktext = ((char *) v >= _stext && (char *) v < etext);
		f = ktext ?_PAGE_RAM_TEXT : _PAGE_RAM;
		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;
	}
}

/* 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_mapped_by_bats(address) || v_mapped_by_tlbcam(address))
		return 0;
	if (!get_pteptr(&init_mm, address, &kpte, &kpmd))
		return -EINVAL;
	set_pte_at(&init_mm, address, kpte, mk_pte(page, prot));
	wmb();
	flush_HPTE(0, address, pmd_val(*kpmd));
	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 */
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>
	29
	30	#include <asm/pgtable.h>
	31	#include <asm/pgalloc.h>
	32	#include <asm/io.h>
	33
	34	#include "mmu_decl.h"
	35
	36	unsigned long ioremap_base;
	37	unsigned long ioremap_bot;
920573bd	38	EXPORT_SYMBOL(ioremap_bot); /* aka VMALLOC_END */
14cf11af PM	39
	40	#if defined(CONFIG_6xx) \|\| defined(CONFIG_POWER3)
	41	#define HAVE_BATS 1
	42	#endif
	43
	44	#if defined(CONFIG_FSL_BOOKE)
	45	#define HAVE_TLBCAM 1
	46	#endif
	47
	48	extern char etext[], _stext[];
	49
	50	#ifdef CONFIG_SMP
	51	extern void hash_page_sync(void);
	52	#endif
	53
	54	#ifdef HAVE_BATS
	55	extern unsigned long v_mapped_by_bats(unsigned long va);
	56	extern unsigned long p_mapped_by_bats(unsigned long pa);
	57	void setbat(int index, unsigned long virt, unsigned long phys,
	58	unsigned int size, int flags);
	59
	60	#else /* !HAVE_BATS */
	61	#define v_mapped_by_bats(x) (0UL)
	62	#define p_mapped_by_bats(x) (0UL)
	63	#endif /* HAVE_BATS */
	64
	65	#ifdef HAVE_TLBCAM
	66	extern unsigned int tlbcam_index;
	67	extern unsigned long v_mapped_by_tlbcam(unsigned long va);
	68	extern unsigned long p_mapped_by_tlbcam(unsigned long pa);
	69	#else /* !HAVE_TLBCAM */
	70	#define v_mapped_by_tlbcam(x) (0UL)
	71	#define p_mapped_by_tlbcam(x) (0UL)
	72	#endif /* HAVE_TLBCAM */
	73
	74	#ifdef CONFIG_PTE_64BIT
	75	/* 44x uses an 8kB pgdir because it has 8-byte Linux PTEs. */
	76	#define PGDIR_ORDER 1
	77	#else
	78	#define PGDIR_ORDER 0
	79	#endif
	80
	81	pgd_t pgd_alloc(struct mm_struct mm)
	82	{
	83	pgd_t *ret;
	84
	85	ret = (pgd_t *)__get_free_pages(GFP_KERNEL\|__GFP_ZERO, PGDIR_ORDER);
	86	return ret;
	87	}
	88
5e541973	89	void pgd_free(struct mm_struct mm, pgd_t pgd)
14cf11af PM	90	{
	91	free_pages((unsigned long)pgd, PGDIR_ORDER);
	92	}
	93
f1aed924	94	__init_refok pte_t pte_alloc_one_kernel(struct mm_struct mm, unsigned long address)
14cf11af PM	95	{
	96	pte_t *pte;
	97	extern int mem_init_done;
	98	extern void *early_get_page(void);
	99
	100	if (mem_init_done) {
	101	pte = (pte_t *)__get_free_page(GFP_KERNEL\|__GFP_REPEAT\|__GFP_ZERO);
	102	} else {
	103	pte = (pte_t *)early_get_page();
	104	if (pte)
	105	clear_page(pte);
	106	}
	107	return pte;
	108	}
	109
2f569afd	110	pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
14cf11af PM	111	{
	112	struct page *ptepage;
	113
	114	#ifdef CONFIG_HIGHPTE
2f569afd	115	gfp_t flags = GFP_KERNEL \| __GFP_HIGHMEM \| __GFP_REPEAT \| __GFP_ZERO;
14cf11af	116	#else
2f569afd	117	gfp_t flags = GFP_KERNEL \| __GFP_REPEAT \| __GFP_ZERO;
14cf11af PM	118	#endif
	119
	120	ptepage = alloc_pages(flags, 0);
2f569afd MS	121	if (!ptepage)
	122	return NULL;
	123	pgtable_page_ctor(ptepage);
14cf11af PM	124	return ptepage;
	125	}
	126
5e541973	127	void pte_free_kernel(struct mm_struct mm, pte_t pte)
14cf11af PM	128	{
	129	#ifdef CONFIG_SMP
	130	hash_page_sync();
	131	#endif
	132	free_page((unsigned long)pte);
	133	}
	134
2f569afd	135	void pte_free(struct mm_struct *mm, pgtable_t ptepage)
14cf11af PM	136	{
	137	#ifdef CONFIG_SMP
	138	hash_page_sync();
	139	#endif
2f569afd	140	pgtable_page_dtor(ptepage);
14cf11af PM	141	__free_page(ptepage);
	142	}
	143
14cf11af PM	144	void __iomem *
	145	ioremap(phys_addr_t addr, unsigned long size)
	146	{
	147	return __ioremap(addr, size, _PAGE_NO_CACHE);
	148	}
920573bd	149	EXPORT_SYMBOL(ioremap);
14cf11af	150
68a64357 BH	151	void __iomem *
	152	ioremap_flags(phys_addr_t addr, unsigned long size, unsigned long flags)
	153	{
	154	return __ioremap(addr, size, flags);
	155	}
	156	EXPORT_SYMBOL(ioremap_flags);
	157
14cf11af PM	158	void __iomem *
	159	__ioremap(phys_addr_t addr, unsigned long size, unsigned long flags)
	160	{
	161	unsigned long v, i;
	162	phys_addr_t p;
	163	int err;
	164
	165	/*
	166	* Choose an address to map it to.
	167	* Once the vmalloc system is running, we use it.
	168	* Before then, we use space going down from ioremap_base
	169	* (ioremap_bot records where we're up to).
	170	*/
	171	p = addr & PAGE_MASK;
	172	size = PAGE_ALIGN(addr + size) - p;
	173
	174	/*
	175	* If the address lies within the first 16 MB, assume it's in ISA
	176	* memory space
	177	*/
	178	if (p < 1610241024)
	179	p += _ISA_MEM_BASE;
	180
	181	/*
	182	* Don't allow anybody to remap normal RAM that we're using.
	183	* mem_init() sets high_memory so only do the check after that.
	184	*/
7c8c6b97	185	if (mem_init_done && (p < virt_to_phys(high_memory))) {
37f01d64 DG	186	printk("__ioremap(): phys addr 0x%llx is RAM lr %p\n",
37f01d64 DG	187	(unsigned long long)p, __builtin_return_address(0));
14cf11af PM	188	return NULL;
	189	}
	190
	191	if (size == 0)
	192	return NULL;
	193
	194	/*
	195	* Is it already mapped? Perhaps overlapped by a previous
	196	* BAT mapping. If the whole area is mapped then we're done,
	197	* otherwise remap it since we want to keep the virt addrs for
	198	* each request contiguous.
	199	*
	200	* We make the assumption here that if the bottom and top
	201	* of the range we want are mapped then it's mapped to the
	202	* same virt address (and this is contiguous).
	203	* -- Cort
	204	*/
	205	if ((v = p_mapped_by_bats(p)) /&& p_mapped_by_bats(p+size-1)/ )
	206	goto out;
	207
	208	if ((v = p_mapped_by_tlbcam(p)))
	209	goto out;
	210
	211	if (mem_init_done) {
	212	struct vm_struct *area;
	213	area = get_vm_area(size, VM_IOREMAP);
	214	if (area == 0)
	215	return NULL;
	216	v = (unsigned long) area->addr;
	217	} else {
	218	v = (ioremap_bot -= size);
	219	}
	220
	221	if ((flags & _PAGE_PRESENT) == 0)
	222	flags \|= _PAGE_KERNEL;
	223	if (flags & _PAGE_NO_CACHE)
	224	flags \|= _PAGE_GUARDED;
	225
	226	/*
	227	* Should check if it is a candidate for a BAT mapping
	228	*/
	229
	230	err = 0;
	231	for (i = 0; i < size && err == 0; i += PAGE_SIZE)
	232	err = map_page(v+i, p+i, flags);
	233	if (err) {
	234	if (mem_init_done)
	235	vunmap((void *)v);
	236	return NULL;
	237	}
	238
	239	out:
	240	return (void __iomem *) (v + ((unsigned long)addr & ~PAGE_MASK));
	241	}
920573bd	242	EXPORT_SYMBOL(__ioremap);
14cf11af PM	243
	244	void iounmap(volatile void __iomem *addr)
	245	{
	246	/*
	247	* If mapped by BATs then there is nothing to do.
	248	* Calling vfree() generates a benign warning.
	249	*/
	250	if (v_mapped_by_bats((unsigned long)addr)) return;
	251
	252	if (addr > high_memory && (unsigned long) addr < ioremap_bot)
	253	vunmap((void *) (PAGE_MASK & (unsigned long)addr));
	254	}
920573bd	255	EXPORT_SYMBOL(iounmap);
14cf11af	256
68a64357	257	int map_page(unsigned long va, phys_addr_t pa, int flags)
14cf11af PM	258	{
	259	pmd_t *pd;
	260	pte_t *pg;
	261	int err = -ENOMEM;
	262
14cf11af	263	/* Use upper 10 bits of VA to index the first level map */
d1953c88	264	pd = pmd_offset(pud_offset(pgd_offset_k(va), va), va);
14cf11af	265	/* Use middle 10 bits of VA to index the second-level map */
e2f2e58e	266	pg = pte_alloc_kernel(pd, va);
14cf11af PM	267	if (pg != 0) {
14cf11af PM	268	err = 0;
3be4e699 BH	269	/* The PTE should never be already set nor present in the
	270	* hash table
	271	*/
	272	BUG_ON(pte_val(*pg) & (_PAGE_PRESENT \| _PAGE_HASHPTE));
	273	set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT,
	274	__pgprot(flags)));
14cf11af	275	}
14cf11af PM	276	return err;
	277	}
	278
	279	/*
	280	* Map in all of physical memory starting at KERNELBASE.
	281	*/
	282	void __init mapin_ram(void)
	283	{
99c62dd7 KG	284	unsigned long v, s, f;
99c62dd7 KG	285	phys_addr_t p;
ee4f2ea4	286	int ktext;
14cf11af PM	287
	288	s = mmu_mapin_ram();
	289	v = KERNELBASE + s;
99c62dd7	290	p = memstart_addr + s;
14cf11af	291	for (; s < total_lowmem; s += PAGE_SIZE) {
ee4f2ea4 BH	292	ktext = ((char ) v >= _stext && (char ) v < etext);
ee4f2ea4 BH	293	f = ktext ?_PAGE_RAM_TEXT : _PAGE_RAM;
14cf11af	294	map_page(v, p, f);
ee4f2ea4 BH	295	#ifdef CONFIG_PPC_STD_MMU_32
	296	if (ktext)
	297	hash_preload(&init_mm, v, 0, 0x300);
	298	#endif
14cf11af PM	299	v += PAGE_SIZE;
	300	p += PAGE_SIZE;
	301	}
	302	}
	303
14cf11af PM	304	/* Scan the real Linux page tables and return a PTE pointer for
	305	* a virtual address in a context.
	306	* Returns true (1) if PTE was found, zero otherwise. The pointer to
	307	* the PTE pointer is unmodified if PTE is not found.
	308	*/
	309	int
bab70a4a	310	get_pteptr(struct mm_struct mm, unsigned long addr, pte_t ptep, pmd_t *pmdp)
14cf11af PM	311	{
14cf11af PM	312	pgd_t *pgd;
d1953c88	313	pud_t *pud;
14cf11af PM	314	pmd_t *pmd;
	315	pte_t *pte;
	316	int retval = 0;
	317
	318	pgd = pgd_offset(mm, addr & PAGE_MASK);
	319	if (pgd) {
d1953c88 DG	320	pud = pud_offset(pgd, addr & PAGE_MASK);
	321	if (pud && pud_present(*pud)) {
	322	pmd = pmd_offset(pud, addr & PAGE_MASK);
	323	if (pmd_present(*pmd)) {
	324	pte = pte_offset_map(pmd, addr & PAGE_MASK);
	325	if (pte) {
	326	retval = 1;
	327	*ptep = pte;
	328	if (pmdp)
	329	*pmdp = pmd;
	330	/* XXX caller needs to do pte_unmap, yuck */
	331	}
	332	}
	333	}
14cf11af PM	334	}
	335	return(retval);
	336	}
	337
88df6e90 BH	338	#ifdef CONFIG_DEBUG_PAGEALLOC
	339
	340	static int __change_page_attr(struct page *page, pgprot_t prot)
	341	{
	342	pte_t *kpte;
	343	pmd_t *kpmd;
	344	unsigned long address;
	345
	346	BUG_ON(PageHighMem(page));
	347	address = (unsigned long)page_address(page);
	348
	349	if (v_mapped_by_bats(address) \|\| v_mapped_by_tlbcam(address))
	350	return 0;
	351	if (!get_pteptr(&init_mm, address, &kpte, &kpmd))
	352	return -EINVAL;
	353	set_pte_at(&init_mm, address, kpte, mk_pte(page, prot));
	354	wmb();
	355	flush_HPTE(0, address, pmd_val(*kpmd));
	356	pte_unmap(kpte);
	357
	358	return 0;
	359	}
	360
	361	/*
	362	* Change the page attributes of an page in the linear mapping.
	363	*
	364	* THIS CONFLICTS WITH BAT MAPPINGS, DEBUG USE ONLY
	365	*/
	366	static int change_page_attr(struct page *page, int numpages, pgprot_t prot)
	367	{
	368	int i, err = 0;
	369	unsigned long flags;
	370
	371	local_irq_save(flags);
	372	for (i = 0; i < numpages; i++, page++) {
	373	err = __change_page_attr(page, prot);
	374	if (err)
	375	break;
	376	}
	377	local_irq_restore(flags);
	378	return err;
	379	}
	380
	381
	382	void kernel_map_pages(struct page *page, int numpages, int enable)
	383	{
	384	if (PageHighMem(page))
	385	return;
	386
	387	change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0));
	388	}
	389	#endif /* CONFIG_DEBUG_PAGEALLOC */