[net-next-2.6.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/lmb.h>
#include <linux/slab.h>

#include <asm/pgtable.h>
#include <asm/pgalloc.h>
#include <asm/fixmap.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 HAVE_BATS
extern phys_addr_t v_mapped_by_bats(unsigned long va);
extern unsigned long p_mapped_by_bats(phys_addr_t pa);
void setbat(int index, unsigned long virt, phys_addr_t 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 phys_addr_t v_mapped_by_tlbcam(unsigned long va);
extern unsigned long p_mapped_by_tlbcam(phys_addr_t pa);
#else /* !HAVE_TLBCAM */
#define v_mapped_by_tlbcam(x)	(0UL)
#define p_mapped_by_tlbcam(x)	(0UL)
#endif /* HAVE_TLBCAM */

#define PGDIR_ORDER	(32 + PGD_T_LOG2 - PGDIR_SHIFT)

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 = (pgd_t *)kzalloc(1 << PGDIR_ORDER, GFP_KERNEL);
#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
	kfree((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;
	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 __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_flags(phys_addr_t addr, unsigned long size, unsigned long flags)
{
	/* writeable implies dirty for kernel addresses */
	if (flags & _PAGE_RW)
		flags |= _PAGE_DIRTY | _PAGE_HWWRITE;

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

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

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 |= 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 (mem_init_done && (p < virt_to_phys(high_memory)) &&
	    !(__allow_ioremap_reserved && lmb_is_region_reserved(p, size))) {
		printk("__ioremap(): phys addr 0x%llx is RAM lr %p\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
	 * 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_caller(size, VM_IOREMAP, caller);
		if (area == 0)
			return NULL;
		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 (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)) &&
		       flags);
		set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT,
						     __pgprot(flags)));
	}
	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 ? PAGE_KERNEL_TEXT : 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 = lmb_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_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), 0);
	wmb();
#ifdef CONFIG_PPC_STD_MMU
	flush_hash_pages(0, address, pmd_val(*kpmd), 1);
#else
	flush_tlb_page(NULL, address);
#endif
	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>
c5df7f77	29	#include <linux/lmb.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 PM	35	#include <asm/io.h>
	36
	37	#include "mmu_decl.h"
	38
	39	unsigned long ioremap_base;
	40	unsigned long ioremap_bot;
920573bd	41	EXPORT_SYMBOL(ioremap_bot); /* aka VMALLOC_END */
14cf11af PM	42
	43	#if defined(CONFIG_6xx) \|\| defined(CONFIG_POWER3)
	44	#define HAVE_BATS 1
	45	#endif
	46
	47	#if defined(CONFIG_FSL_BOOKE)
	48	#define HAVE_TLBCAM 1
	49	#endif
	50
	51	extern char etext[], _stext[];
	52
14cf11af	53	#ifdef HAVE_BATS
7c5c4325 BB	54	extern phys_addr_t v_mapped_by_bats(unsigned long va);
	55	extern unsigned long p_mapped_by_bats(phys_addr_t pa);
	56	void setbat(int index, unsigned long virt, phys_addr_t phys,
14cf11af PM	57	unsigned int size, int flags);
	58
	59	#else /* !HAVE_BATS */
	60	#define v_mapped_by_bats(x) (0UL)
	61	#define p_mapped_by_bats(x) (0UL)
	62	#endif /* HAVE_BATS */
	63
	64	#ifdef HAVE_TLBCAM
	65	extern unsigned int tlbcam_index;
6c24b174 KG	66	extern phys_addr_t v_mapped_by_tlbcam(unsigned long va);
6c24b174 KG	67	extern unsigned long p_mapped_by_tlbcam(phys_addr_t pa);
14cf11af PM	68	#else /* !HAVE_TLBCAM */
	69	#define v_mapped_by_tlbcam(x) (0UL)
	70	#define p_mapped_by_tlbcam(x) (0UL)
	71	#endif /* HAVE_TLBCAM */
	72
ca9153a3	73	#define PGDIR_ORDER (32 + PGD_T_LOG2 - PGDIR_SHIFT)
14cf11af PM	74
	75	pgd_t pgd_alloc(struct mm_struct mm)
	76	{
	77	pgd_t *ret;
	78
ca9153a3 IY	79	/* pgdir take page or two with 4K pages and a page fraction otherwise */
	80	#ifndef CONFIG_PPC_4K_PAGES
	81	ret = (pgd_t *)kzalloc(1 << PGDIR_ORDER, GFP_KERNEL);
	82	#else
	83	ret = (pgd_t *)__get_free_pages(GFP_KERNEL\|__GFP_ZERO,
	84	PGDIR_ORDER - PAGE_SHIFT);
	85	#endif
14cf11af PM	86	return ret;
	87	}
	88
5e541973	89	void pgd_free(struct mm_struct mm, pgd_t pgd)
14cf11af	90	{
ca9153a3 IY	91	#ifndef CONFIG_PPC_4K_PAGES
	92	kfree((void *)pgd);
	93	#else
	94	free_pages((unsigned long)pgd, PGDIR_ORDER - PAGE_SHIFT);
	95	#endif
14cf11af PM	96	}
14cf11af PM	97
f1aed924	98	__init_refok pte_t pte_alloc_one_kernel(struct mm_struct mm, unsigned long address)
14cf11af PM	99	{
	100	pte_t *pte;
	101	extern int mem_init_done;
	102	extern void *early_get_page(void);
	103
	104	if (mem_init_done) {
	105	pte = (pte_t *)__get_free_page(GFP_KERNEL\|__GFP_REPEAT\|__GFP_ZERO);
	106	} else {
	107	pte = (pte_t *)early_get_page();
	108	if (pte)
	109	clear_page(pte);
	110	}
	111	return pte;
	112	}
	113
2f569afd	114	pgtable_t pte_alloc_one(struct mm_struct *mm, unsigned long address)
14cf11af PM	115	{
	116	struct page *ptepage;
	117
	118	#ifdef CONFIG_HIGHPTE
2f569afd	119	gfp_t flags = GFP_KERNEL \| __GFP_HIGHMEM \| __GFP_REPEAT \| __GFP_ZERO;
14cf11af	120	#else
2f569afd	121	gfp_t flags = GFP_KERNEL \| __GFP_REPEAT \| __GFP_ZERO;
14cf11af PM	122	#endif
	123
	124	ptepage = alloc_pages(flags, 0);
2f569afd MS	125	if (!ptepage)
	126	return NULL;
	127	pgtable_page_ctor(ptepage);
14cf11af PM	128	return ptepage;
	129	}
	130
14cf11af PM	131	void __iomem *
	132	ioremap(phys_addr_t addr, unsigned long size)
	133	{
1cdab55d BH	134	return __ioremap_caller(addr, size, _PAGE_NO_CACHE \| _PAGE_GUARDED,
1cdab55d BH	135	__builtin_return_address(0));
14cf11af	136	}
920573bd	137	EXPORT_SYMBOL(ioremap);
14cf11af	138
68a64357 BH	139	void __iomem *
	140	ioremap_flags(phys_addr_t addr, unsigned long size, unsigned long flags)
	141	{
a1f242ff BH	142	/* writeable implies dirty for kernel addresses */
	143	if (flags & _PAGE_RW)
	144	flags \|= _PAGE_DIRTY \| _PAGE_HWWRITE;
	145
	146	/* we don't want to let _PAGE_USER and _PAGE_EXEC leak out */
ea3cc330	147	flags &= ~(_PAGE_USER \| _PAGE_EXEC);
a1f242ff	148
1cdab55d	149	return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
68a64357 BH	150	}
	151	EXPORT_SYMBOL(ioremap_flags);
	152
14cf11af PM	153	void __iomem *
14cf11af PM	154	__ioremap(phys_addr_t addr, unsigned long size, unsigned long flags)
1cdab55d BH	155	{
	156	return __ioremap_caller(addr, size, flags, __builtin_return_address(0));
	157	}
	158
	159	void __iomem *
	160	__ioremap_caller(phys_addr_t addr, unsigned long size, unsigned long flags,
	161	void *caller)
14cf11af PM	162	{
	163	unsigned long v, i;
	164	phys_addr_t p;
	165	int err;
	166
a1f242ff BH	167	/* Make sure we have the base flags */
a1f242ff BH	168	if ((flags & _PAGE_PRESENT) == 0)
8d1cf34e	169	flags \|= PAGE_KERNEL;
a1f242ff BH	170
	171	/* Non-cacheable page cannot be coherent */
	172	if (flags & _PAGE_NO_CACHE)
	173	flags &= ~_PAGE_COHERENT;
	174
14cf11af PM	175	/*
	176	* Choose an address to map it to.
	177	* Once the vmalloc system is running, we use it.
	178	* Before then, we use space going down from ioremap_base
	179	* (ioremap_bot records where we're up to).
	180	*/
	181	p = addr & PAGE_MASK;
	182	size = PAGE_ALIGN(addr + size) - p;
	183
	184	/*
	185	* If the address lies within the first 16 MB, assume it's in ISA
	186	* memory space
	187	*/
	188	if (p < 1610241024)
	189	p += _ISA_MEM_BASE;
	190
01695a96	191	#ifndef CONFIG_CRASH_DUMP
14cf11af PM	192	/*
	193	* Don't allow anybody to remap normal RAM that we're using.
	194	* mem_init() sets high_memory so only do the check after that.
	195	*/
c5df7f77 AH	196	if (mem_init_done && (p < virt_to_phys(high_memory)) &&
c5df7f77 AH	197	!(__allow_ioremap_reserved && lmb_is_region_reserved(p, size))) {
37f01d64 DG	198	printk("__ioremap(): phys addr 0x%llx is RAM lr %p\n",
37f01d64 DG	199	(unsigned long long)p, __builtin_return_address(0));
14cf11af PM	200	return NULL;
14cf11af PM	201	}
01695a96	202	#endif
14cf11af PM	203
	204	if (size == 0)
	205	return NULL;
	206
	207	/*
	208	* Is it already mapped? Perhaps overlapped by a previous
	209	* BAT mapping. If the whole area is mapped then we're done,
	210	* otherwise remap it since we want to keep the virt addrs for
	211	* each request contiguous.
	212	*
	213	* We make the assumption here that if the bottom and top
	214	* of the range we want are mapped then it's mapped to the
	215	* same virt address (and this is contiguous).
	216	* -- Cort
	217	*/
	218	if ((v = p_mapped_by_bats(p)) /&& p_mapped_by_bats(p+size-1)/ )
	219	goto out;
	220
	221	if ((v = p_mapped_by_tlbcam(p)))
	222	goto out;
	223
	224	if (mem_init_done) {
	225	struct vm_struct *area;
1cdab55d	226	area = get_vm_area_caller(size, VM_IOREMAP, caller);
14cf11af PM	227	if (area == 0)
	228	return NULL;
	229	v = (unsigned long) area->addr;
	230	} else {
	231	v = (ioremap_bot -= size);
	232	}
	233
14cf11af PM	234	/*
	235	* Should check if it is a candidate for a BAT mapping
	236	*/
	237
	238	err = 0;
	239	for (i = 0; i < size && err == 0; i += PAGE_SIZE)
	240	err = map_page(v+i, p+i, flags);
	241	if (err) {
	242	if (mem_init_done)
	243	vunmap((void *)v);
	244	return NULL;
	245	}
	246
	247	out:
	248	return (void __iomem *) (v + ((unsigned long)addr & ~PAGE_MASK));
	249	}
920573bd	250	EXPORT_SYMBOL(__ioremap);
14cf11af PM	251
	252	void iounmap(volatile void __iomem *addr)
	253	{
	254	/*
	255	* If mapped by BATs then there is nothing to do.
	256	* Calling vfree() generates a benign warning.
	257	*/
	258	if (v_mapped_by_bats((unsigned long)addr)) return;
	259
	260	if (addr > high_memory && (unsigned long) addr < ioremap_bot)
	261	vunmap((void *) (PAGE_MASK & (unsigned long)addr));
	262	}
920573bd	263	EXPORT_SYMBOL(iounmap);
14cf11af	264
68a64357	265	int map_page(unsigned long va, phys_addr_t pa, int flags)
14cf11af PM	266	{
	267	pmd_t *pd;
	268	pte_t *pg;
	269	int err = -ENOMEM;
	270
14cf11af	271	/* Use upper 10 bits of VA to index the first level map */
d1953c88	272	pd = pmd_offset(pud_offset(pgd_offset_k(va), va), va);
14cf11af	273	/* Use middle 10 bits of VA to index the second-level map */
e2f2e58e	274	pg = pte_alloc_kernel(pd, va);
14cf11af PM	275	if (pg != 0) {
14cf11af PM	276	err = 0;
3be4e699 BH	277	/* The PTE should never be already set nor present in the
	278	* hash table
	279	*/
7021d86a AV	280	BUG_ON((pte_val(*pg) & (_PAGE_PRESENT \| _PAGE_HASHPTE)) &&
7021d86a AV	281	flags);
3be4e699 BH	282	set_pte_at(&init_mm, va, pg, pfn_pte(pa >> PAGE_SHIFT,
3be4e699 BH	283	__pgprot(flags)));
14cf11af	284	}
14cf11af PM	285	return err;
	286	}
	287
	288	/*
de32400d	289	* Map in a chunk of physical memory starting at start.
14cf11af	290	*/
de32400d	291	void __init __mapin_ram_chunk(unsigned long offset, unsigned long top)
14cf11af	292	{
99c62dd7 KG	293	unsigned long v, s, f;
99c62dd7 KG	294	phys_addr_t p;
ee4f2ea4	295	int ktext;
14cf11af	296
de32400d	297	s = offset;
ccdcef72	298	v = PAGE_OFFSET + s;
99c62dd7	299	p = memstart_addr + s;
de32400d	300	for (; s < top; s += PAGE_SIZE) {
ee4f2ea4	301	ktext = ((char ) v >= _stext && (char ) v < etext);
8d1cf34e	302	f = ktext ? PAGE_KERNEL_TEXT : PAGE_KERNEL;
14cf11af	303	map_page(v, p, f);
ee4f2ea4 BH	304	#ifdef CONFIG_PPC_STD_MMU_32
	305	if (ktext)
	306	hash_preload(&init_mm, v, 0, 0x300);
	307	#endif
14cf11af PM	308	v += PAGE_SIZE;
	309	p += PAGE_SIZE;
	310	}
	311	}
	312
de32400d AH	313	void __init mapin_ram(void)
	314	{
	315	unsigned long s, top;
	316
	317	#ifndef CONFIG_WII
	318	top = total_lowmem;
	319	s = mmu_mapin_ram(top);
	320	__mapin_ram_chunk(s, top);
	321	#else
	322	if (!wii_hole_size) {
	323	s = mmu_mapin_ram(total_lowmem);
	324	__mapin_ram_chunk(s, total_lowmem);
	325	} else {
	326	top = wii_hole_start;
	327	s = mmu_mapin_ram(top);
	328	__mapin_ram_chunk(s, top);
	329
	330	top = lmb_end_of_DRAM();
	331	s = wii_mmu_mapin_mem2(top);
	332	__mapin_ram_chunk(s, top);
	333	}
	334	#endif
	335	}
	336
14cf11af PM	337	/* Scan the real Linux page tables and return a PTE pointer for
	338	* a virtual address in a context.
	339	* Returns true (1) if PTE was found, zero otherwise. The pointer to
	340	* the PTE pointer is unmodified if PTE is not found.
	341	*/
	342	int
bab70a4a	343	get_pteptr(struct mm_struct mm, unsigned long addr, pte_t ptep, pmd_t *pmdp)
14cf11af PM	344	{
14cf11af PM	345	pgd_t *pgd;
d1953c88	346	pud_t *pud;
14cf11af PM	347	pmd_t *pmd;
	348	pte_t *pte;
	349	int retval = 0;
	350
	351	pgd = pgd_offset(mm, addr & PAGE_MASK);
	352	if (pgd) {
d1953c88 DG	353	pud = pud_offset(pgd, addr & PAGE_MASK);
	354	if (pud && pud_present(*pud)) {
	355	pmd = pmd_offset(pud, addr & PAGE_MASK);
	356	if (pmd_present(*pmd)) {
	357	pte = pte_offset_map(pmd, addr & PAGE_MASK);
	358	if (pte) {
	359	retval = 1;
	360	*ptep = pte;
	361	if (pmdp)
	362	*pmdp = pmd;
	363	/* XXX caller needs to do pte_unmap, yuck */
	364	}
	365	}
	366	}
14cf11af PM	367	}
	368	return(retval);
	369	}
	370
88df6e90 BH	371	#ifdef CONFIG_DEBUG_PAGEALLOC
	372
	373	static int __change_page_attr(struct page *page, pgprot_t prot)
	374	{
	375	pte_t *kpte;
	376	pmd_t *kpmd;
	377	unsigned long address;
	378
	379	BUG_ON(PageHighMem(page));
	380	address = (unsigned long)page_address(page);
	381
	382	if (v_mapped_by_bats(address) \|\| v_mapped_by_tlbcam(address))
	383	return 0;
	384	if (!get_pteptr(&init_mm, address, &kpte, &kpmd))
	385	return -EINVAL;
50891457	386	__set_pte_at(&init_mm, address, kpte, mk_pte(page, prot), 0);
88df6e90	387	wmb();
f63837f0 BH	388	#ifdef CONFIG_PPC_STD_MMU
	389	flush_hash_pages(0, address, pmd_val(*kpmd), 1);
	390	#else
	391	flush_tlb_page(NULL, address);
	392	#endif
88df6e90 BH	393	pte_unmap(kpte);
	394
	395	return 0;
	396	}
	397
	398	/*
	399	* Change the page attributes of an page in the linear mapping.
	400	*
	401	* THIS CONFLICTS WITH BAT MAPPINGS, DEBUG USE ONLY
	402	*/
	403	static int change_page_attr(struct page *page, int numpages, pgprot_t prot)
	404	{
	405	int i, err = 0;
	406	unsigned long flags;
	407
	408	local_irq_save(flags);
	409	for (i = 0; i < numpages; i++, page++) {
	410	err = __change_page_attr(page, prot);
	411	if (err)
	412	break;
	413	}
	414	local_irq_restore(flags);
	415	return err;
	416	}
	417
	418
	419	void kernel_map_pages(struct page *page, int numpages, int enable)
	420	{
	421	if (PageHighMem(page))
	422	return;
	423
	424	change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0));
	425	}
	426	#endif /* CONFIG_DEBUG_PAGEALLOC */
2c419bde KG	427
2c419bde KG	428	static int fixmaps;
2c419bde KG	429
	430	void __set_fixmap (enum fixed_addresses idx, phys_addr_t phys, pgprot_t flags)
	431	{
	432	unsigned long address = __fix_to_virt(idx);
	433
	434	if (idx >= __end_of_fixed_addresses) {
	435	BUG();
	436	return;
	437	}
	438
46a74179	439	map_page(address, phys, pgprot_val(flags));
2c419bde KG	440	fixmaps++;
	441	}
	442
	443	void __this_fixmap_does_not_exist(void)
	444	{
	445	WARN_ON(1);
	446	}