[deliverable/linux.git] / include / asm-mips / pgtable.h

/*
 * 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) 2003 Ralf Baechle
 */
#ifndef _ASM_PGTABLE_H
#define _ASM_PGTABLE_H

#ifdef CONFIG_32BIT
#include <asm/pgtable-32.h>
#endif
#ifdef CONFIG_64BIT
#include <asm/pgtable-64.h>
#endif

#include <asm/io.h>
#include <asm/pgtable-bits.h>

struct mm_struct;
struct vm_area_struct;

#define PAGE_NONE	__pgprot(_PAGE_PRESENT | _CACHE_CACHABLE_NONCOHERENT)
#define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
			PAGE_CACHABLE_DEFAULT)
#define PAGE_COPY	__pgprot(_PAGE_PRESENT | _PAGE_READ | \
			PAGE_CACHABLE_DEFAULT)
#define PAGE_READONLY	__pgprot(_PAGE_PRESENT | _PAGE_READ | \
			PAGE_CACHABLE_DEFAULT)
#define PAGE_KERNEL	__pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
			_PAGE_GLOBAL | PAGE_CACHABLE_DEFAULT)
#define PAGE_USERIO	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_WRITE | \
			PAGE_CACHABLE_DEFAULT)
#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
			__WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)

/*
 * MIPS can't do page protection for execute, and considers that the same like
 * read. Also, write permissions imply read permissions. This is the closest
 * we can get by reasonable means..
 */
#define __P000	PAGE_NONE
#define __P001	PAGE_READONLY
#define __P010	PAGE_COPY
#define __P011	PAGE_COPY
#define __P100	PAGE_READONLY
#define __P101	PAGE_READONLY
#define __P110	PAGE_COPY
#define __P111	PAGE_COPY

#define __S000	PAGE_NONE
#define __S001	PAGE_READONLY
#define __S010	PAGE_SHARED
#define __S011	PAGE_SHARED
#define __S100	PAGE_READONLY
#define __S101	PAGE_READONLY
#define __S110	PAGE_SHARED
#define __S111	PAGE_SHARED

/*
 * ZERO_PAGE is a global shared page that is always zero; used
 * for zero-mapped memory areas etc..
 */

extern unsigned long empty_zero_page;
extern unsigned long zero_page_mask;

#define ZERO_PAGE(vaddr) \
	(virt_to_page(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))

#define __HAVE_ARCH_MOVE_PTE
#define move_pte(pte, prot, old_addr, new_addr)				\
({									\
 	pte_t newpte = (pte);						\
	if (pte_present(pte) && pfn_valid(pte_pfn(pte)) &&		\
			pte_page(pte) == ZERO_PAGE(old_addr))		\
		newpte = mk_pte(ZERO_PAGE(new_addr), (prot));		\
	newpte;								\
})

extern void paging_init(void);

/*
 * Conversion functions: convert a page and protection to a page entry,
 * and a page entry and page directory to the page they refer to.
 */
#define pmd_phys(pmd)		(pmd_val(pmd) - PAGE_OFFSET)
#define pmd_page(pmd)		(pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
#define pmd_page_kernel(pmd)	pmd_val(pmd)

#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)

#define pte_none(pte)		(!(((pte).pte_low | (pte).pte_high) & ~_PAGE_GLOBAL))
#define pte_present(pte)	((pte).pte_low & _PAGE_PRESENT)

static inline void set_pte(pte_t *ptep, pte_t pte)
{
	ptep->pte_high = pte.pte_high;
	smp_wmb();
	ptep->pte_low = pte.pte_low;
	//printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);

	if (pte.pte_low & _PAGE_GLOBAL) {
		pte_t *buddy = ptep_buddy(ptep);
		/*
		 * Make sure the buddy is global too (if it's !none,
		 * it better already be global)
		 */
		if (pte_none(*buddy)) {
			buddy->pte_low  |= _PAGE_GLOBAL;
			buddy->pte_high |= _PAGE_GLOBAL;
		}
	}
}
#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)

static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
	pte_t null = __pte(0);

	/* Preserve global status for the pair */
	if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
		null.pte_low = null.pte_high = _PAGE_GLOBAL;

	set_pte_at(mm, addr, ptep, null);
}
#else

#define pte_none(pte)		(!(pte_val(pte) & ~_PAGE_GLOBAL))
#define pte_present(pte)	(pte_val(pte) & _PAGE_PRESENT)

/*
 * Certain architectures need to do special things when pte's
 * within a page table are directly modified.  Thus, the following
 * hook is made available.
 */
static inline void set_pte(pte_t *ptep, pte_t pteval)
{
	*ptep = pteval;
#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
	if (pte_val(pteval) & _PAGE_GLOBAL) {
		pte_t *buddy = ptep_buddy(ptep);
		/*
		 * Make sure the buddy is global too (if it's !none,
		 * it better already be global)
		 */
		if (pte_none(*buddy))
			pte_val(*buddy) = pte_val(*buddy) | _PAGE_GLOBAL;
	}
#endif
}
#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)

static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
	/* Preserve global status for the pair */
	if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
		set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
	else
#endif
		set_pte_at(mm, addr, ptep, __pte(0));
}
#endif

/*
 * (pmds are folded into puds so this doesn't get actually called,
 * but the define is needed for a generic inline function.)
 */
#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)

#ifdef CONFIG_64BIT
/*
 * (puds are folded into pgds so this doesn't get actually called,
 * but the define is needed for a generic inline function.)
 */
#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
#endif

#define PGD_T_LOG2	ffz(~sizeof(pgd_t))
#define PMD_T_LOG2	ffz(~sizeof(pmd_t))
#define PTE_T_LOG2	ffz(~sizeof(pte_t))

extern pgd_t swapper_pg_dir[PTRS_PER_PGD];

/*
 * The following only work if pte_present() is true.
 * Undefined behaviour if not..
 */
static inline int pte_user(pte_t pte)	{ BUG(); return 0; }
#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
static inline int pte_read(pte_t pte)	{ return pte.pte_low & _PAGE_READ; }
static inline int pte_write(pte_t pte)	{ return pte.pte_low & _PAGE_WRITE; }
static inline int pte_dirty(pte_t pte)	{ return pte.pte_low & _PAGE_MODIFIED; }
static inline int pte_young(pte_t pte)	{ return pte.pte_low & _PAGE_ACCESSED; }
static inline int pte_file(pte_t pte)	{ return pte.pte_low & _PAGE_FILE; }

static inline pte_t pte_wrprotect(pte_t pte)
{
	pte.pte_low  &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
	pte.pte_high &= ~_PAGE_SILENT_WRITE;
	return pte;
}

static inline pte_t pte_rdprotect(pte_t pte)
{
	pte.pte_low  &= ~(_PAGE_READ | _PAGE_SILENT_READ);
	pte.pte_high &= ~_PAGE_SILENT_READ;
	return pte;
}

static inline pte_t pte_mkclean(pte_t pte)
{
	pte.pte_low  &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
	pte.pte_high &= ~_PAGE_SILENT_WRITE;
	return pte;
}

static inline pte_t pte_mkold(pte_t pte)
{
	pte.pte_low  &= ~(_PAGE_ACCESSED | _PAGE_SILENT_READ);
	pte.pte_high &= ~_PAGE_SILENT_READ;
	return pte;
}

static inline pte_t pte_mkwrite(pte_t pte)
{
	pte.pte_low |= _PAGE_WRITE;
	if (pte.pte_low & _PAGE_MODIFIED) {
		pte.pte_low  |= _PAGE_SILENT_WRITE;
		pte.pte_high |= _PAGE_SILENT_WRITE;
	}
	return pte;
}

static inline pte_t pte_mkread(pte_t pte)
{
	pte.pte_low |= _PAGE_READ;
	if (pte.pte_low & _PAGE_ACCESSED) {
		pte.pte_low  |= _PAGE_SILENT_READ;
		pte.pte_high |= _PAGE_SILENT_READ;
	}
	return pte;
}

static inline pte_t pte_mkdirty(pte_t pte)
{
	pte.pte_low |= _PAGE_MODIFIED;
	if (pte.pte_low & _PAGE_WRITE) {
		pte.pte_low  |= _PAGE_SILENT_WRITE;
		pte.pte_high |= _PAGE_SILENT_WRITE;
	}
	return pte;
}

static inline pte_t pte_mkyoung(pte_t pte)
{
	pte.pte_low |= _PAGE_ACCESSED;
	if (pte.pte_low & _PAGE_READ)
		pte.pte_low  |= _PAGE_SILENT_READ;
		pte.pte_high |= _PAGE_SILENT_READ;
	return pte;
}
#else
static inline int pte_read(pte_t pte)	{ return pte_val(pte) & _PAGE_READ; }
static inline int pte_write(pte_t pte)	{ return pte_val(pte) & _PAGE_WRITE; }
static inline int pte_dirty(pte_t pte)	{ return pte_val(pte) & _PAGE_MODIFIED; }
static inline int pte_young(pte_t pte)	{ return pte_val(pte) & _PAGE_ACCESSED; }
static inline int pte_file(pte_t pte)	{ return pte_val(pte) & _PAGE_FILE; }

static inline pte_t pte_wrprotect(pte_t pte)
{
	pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
	return pte;
}

static inline pte_t pte_rdprotect(pte_t pte)
{
	pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
	return pte;
}

static inline pte_t pte_mkclean(pte_t pte)
{
	pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
	return pte;
}

static inline pte_t pte_mkold(pte_t pte)
{
	pte_val(pte) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);
	return pte;
}

static inline pte_t pte_mkwrite(pte_t pte)
{
	pte_val(pte) |= _PAGE_WRITE;
	if (pte_val(pte) & _PAGE_MODIFIED)
		pte_val(pte) |= _PAGE_SILENT_WRITE;
	return pte;
}

static inline pte_t pte_mkread(pte_t pte)
{
	pte_val(pte) |= _PAGE_READ;
	if (pte_val(pte) & _PAGE_ACCESSED)
		pte_val(pte) |= _PAGE_SILENT_READ;
	return pte;
}

static inline pte_t pte_mkdirty(pte_t pte)
{
	pte_val(pte) |= _PAGE_MODIFIED;
	if (pte_val(pte) & _PAGE_WRITE)
		pte_val(pte) |= _PAGE_SILENT_WRITE;
	return pte;
}

static inline pte_t pte_mkyoung(pte_t pte)
{
	pte_val(pte) |= _PAGE_ACCESSED;
	if (pte_val(pte) & _PAGE_READ)
		pte_val(pte) |= _PAGE_SILENT_READ;
	return pte;
}
#endif

/*
 * Macro to make mark a page protection value as "uncacheable".  Note
 * that "protection" is really a misnomer here as the protection value
 * contains the memory attribute bits, dirty bits, and various other
 * bits as well.
 */
#define pgprot_noncached pgprot_noncached

static inline pgprot_t pgprot_noncached(pgprot_t _prot)
{
	unsigned long prot = pgprot_val(_prot);

	prot = (prot & ~_CACHE_MASK) | _CACHE_UNCACHED;

	return __pgprot(prot);
}

/*
 * Conversion functions: convert a page and protection to a page entry,
 * and a page entry and page directory to the page they refer to.
 */
#define mk_pte(page, pgprot)	pfn_pte(page_to_pfn(page), (pgprot))

#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
	pte.pte_low  &= _PAGE_CHG_MASK;
	pte.pte_high &= ~0x3f;
	pte.pte_low  |= pgprot_val(newprot);
	pte.pte_high |= pgprot_val(newprot) & 0x3f;
	return pte;
}
#else
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
	return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
}
#endif


extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
	pte_t pte);
extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
	pte_t pte);

static inline void update_mmu_cache(struct vm_area_struct *vma,
	unsigned long address, pte_t pte)
{
	__update_tlb(vma, address, pte);
	__update_cache(vma, address, pte);
}

#define kern_addr_valid(addr)	(1)

#ifdef CONFIG_64BIT_PHYS_ADDR
extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);

static inline int io_remap_pfn_range(struct vm_area_struct *vma,
		unsigned long vaddr,
		unsigned long pfn,
		unsigned long size,
		pgprot_t prot)
{
	phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
	return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
}
#else
#define io_remap_pfn_range(vma, vaddr, pfn, size, prot)		\
		remap_pfn_range(vma, vaddr, pfn, size, prot)
#endif

#define MK_IOSPACE_PFN(space, pfn)	(pfn)
#define GET_IOSPACE(pfn)		0
#define GET_PFN(pfn)			(pfn)

#include <asm-generic/pgtable.h>

/*
 * We provide our own get_unmapped area to cope with the virtual aliasing
 * constraints placed on us by the cache architecture.
 */
#define HAVE_ARCH_UNMAPPED_AREA

/*
 * No page table caches to initialise
 */
#define pgtable_cache_init()	do { } while (0)

#endif /* _ASM_PGTABLE_H */
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) 2003 Ralf Baechle
	7	*/
	8	#ifndef _ASM_PGTABLE_H
	9	#define _ASM_PGTABLE_H
	10
875d43e7	11	#ifdef CONFIG_32BIT
1da177e4 LT	12	#include <asm/pgtable-32.h>
1da177e4 LT	13	#endif
875d43e7	14	#ifdef CONFIG_64BIT
1da177e4 LT	15	#include <asm/pgtable-64.h>
	16	#endif
	17
f10fae02	18	#include <asm/io.h>
1da177e4 LT	19	#include <asm/pgtable-bits.h>
1da177e4 LT	20
8c65b4a6 TS	21	struct mm_struct;
	22	struct vm_area_struct;
	23
1da177e4 LT	24	#define PAGE_NONE __pgprot(_PAGE_PRESENT \| _CACHE_CACHABLE_NONCOHERENT)
	25	#define PAGE_SHARED __pgprot(_PAGE_PRESENT \| _PAGE_READ \| _PAGE_WRITE \| \
	26	PAGE_CACHABLE_DEFAULT)
	27	#define PAGE_COPY __pgprot(_PAGE_PRESENT \| _PAGE_READ \| \
	28	PAGE_CACHABLE_DEFAULT)
	29	#define PAGE_READONLY __pgprot(_PAGE_PRESENT \| _PAGE_READ \| \
	30	PAGE_CACHABLE_DEFAULT)
	31	#define PAGE_KERNEL __pgprot(_PAGE_PRESENT \| __READABLE \| __WRITEABLE \| \
	32	_PAGE_GLOBAL \| PAGE_CACHABLE_DEFAULT)
	33	#define PAGE_USERIO __pgprot(_PAGE_PRESENT \| _PAGE_READ \| _PAGE_WRITE \| \
	34	PAGE_CACHABLE_DEFAULT)
	35	#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT \| __READABLE \| \
	36	__WRITEABLE \| _PAGE_GLOBAL \| _CACHE_UNCACHED)
	37
	38	/*
	39	* MIPS can't do page protection for execute, and considers that the same like
	40	* read. Also, write permissions imply read permissions. This is the closest
	41	* we can get by reasonable means..
	42	*/
	43	#define __P000 PAGE_NONE
	44	#define __P001 PAGE_READONLY
	45	#define __P010 PAGE_COPY
	46	#define __P011 PAGE_COPY
	47	#define __P100 PAGE_READONLY
	48	#define __P101 PAGE_READONLY
	49	#define __P110 PAGE_COPY
	50	#define __P111 PAGE_COPY
	51
	52	#define __S000 PAGE_NONE
	53	#define __S001 PAGE_READONLY
	54	#define __S010 PAGE_SHARED
	55	#define __S011 PAGE_SHARED
	56	#define __S100 PAGE_READONLY
	57	#define __S101 PAGE_READONLY
	58	#define __S110 PAGE_SHARED
	59	#define __S111 PAGE_SHARED
	60
	61	/*
	62	* ZERO_PAGE is a global shared page that is always zero; used
	63	* for zero-mapped memory areas etc..
	64	*/
	65
	66	extern unsigned long empty_zero_page;
	67	extern unsigned long zero_page_mask;
	68
	69	#define ZERO_PAGE(vaddr) \
	70	(virt_to_page(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask)))
	71
0b0968a3 DM	72	#define __HAVE_ARCH_MOVE_PTE
	73	#define move_pte(pte, prot, old_addr, new_addr) \
	74	({ \
	75	pte_t newpte = (pte); \
	76	if (pte_present(pte) && pfn_valid(pte_pfn(pte)) && \
	77	pte_page(pte) == ZERO_PAGE(old_addr)) \
	78	newpte = mk_pte(ZERO_PAGE(new_addr), (prot)); \
	79	newpte; \
	80	})
8b1f3124	81
1da177e4 LT	82	extern void paging_init(void);
	83
	84	/*
	85	* Conversion functions: convert a page and protection to a page entry,
	86	* and a page entry and page directory to the page they refer to.
	87	*/
1da177e4 LT	88	#define pmd_phys(pmd) (pmd_val(pmd) - PAGE_OFFSET)
	89	#define pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
	90	#define pmd_page_kernel(pmd) pmd_val(pmd)
	91
6e760c8d	92	#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
6e953891 SS	93
	94	#define pte_none(pte) (!(((pte).pte_low \| (pte).pte_high) & ~_PAGE_GLOBAL))
	95	#define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
	96
1da177e4 LT	97	static inline void set_pte(pte_t *ptep, pte_t pte)
	98	{
	99	ptep->pte_high = pte.pte_high;
	100	smp_wmb();
	101	ptep->pte_low = pte.pte_low;
	102	//printk("pte_high %x pte_low %x\n", ptep->pte_high, ptep->pte_low);
	103
6e953891	104	if (pte.pte_low & _PAGE_GLOBAL) {
1da177e4 LT	105	pte_t *buddy = ptep_buddy(ptep);
	106	/*
	107	* Make sure the buddy is global too (if it's !none,
	108	* it better already be global)
	109	*/
6e953891 SS	110	if (pte_none(*buddy)) {
	111	buddy->pte_low \|= _PAGE_GLOBAL;
	112	buddy->pte_high \|= _PAGE_GLOBAL;
	113	}
1da177e4 LT	114	}
	115	}
	116	#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
	117
	118	static inline void pte_clear(struct mm_struct mm, unsigned long addr, pte_t ptep)
	119	{
6e953891 SS	120	pte_t null = __pte(0);
6e953891 SS	121
1da177e4	122	/* Preserve global status for the pair */
6e953891 SS	123	if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
	124	null.pte_low = null.pte_high = _PAGE_GLOBAL;
	125
	126	set_pte_at(mm, addr, ptep, null);
1da177e4 LT	127	}
1da177e4 LT	128	#else
6e953891 SS	129
	130	#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
	131	#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
	132
1da177e4 LT	133	/*
	134	* Certain architectures need to do special things when pte's
	135	* within a page table are directly modified. Thus, the following
	136	* hook is made available.
	137	*/
	138	static inline void set_pte(pte_t *ptep, pte_t pteval)
	139	{
	140	*ptep = pteval;
	141	#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
	142	if (pte_val(pteval) & _PAGE_GLOBAL) {
	143	pte_t *buddy = ptep_buddy(ptep);
	144	/*
	145	* Make sure the buddy is global too (if it's !none,
	146	* it better already be global)
	147	*/
	148	if (pte_none(*buddy))
	149	pte_val(buddy) = pte_val(buddy) \| _PAGE_GLOBAL;
	150	}
	151	#endif
	152	}
	153	#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
	154
	155	static inline void pte_clear(struct mm_struct mm, unsigned long addr, pte_t ptep)
	156	{
	157	#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
	158	/* Preserve global status for the pair */
	159	if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
	160	set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
	161	else
	162	#endif
	163	set_pte_at(mm, addr, ptep, __pte(0));
	164	}
	165	#endif
	166
	167	/*
c6e8b587	168	* (pmds are folded into puds so this doesn't get actually called,
1da177e4 LT	169	* but the define is needed for a generic inline function.)
	170	*/
	171	#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
c6e8b587 RB	172
	173	#ifdef CONFIG_64BIT
	174	/*
	175	* (puds are folded into pgds so this doesn't get actually called,
	176	* but the define is needed for a generic inline function.)
	177	*/
	178	#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
	179	#endif
1da177e4 LT	180
	181	#define PGD_T_LOG2 ffz(~sizeof(pgd_t))
	182	#define PMD_T_LOG2 ffz(~sizeof(pmd_t))
	183	#define PTE_T_LOG2 ffz(~sizeof(pte_t))
	184
	185	extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
	186
	187	/*
	188	* The following only work if pte_present() is true.
	189	* Undefined behaviour if not..
	190	*/
	191	static inline int pte_user(pte_t pte) { BUG(); return 0; }
6e760c8d	192	#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
6e953891 SS	193	static inline int pte_read(pte_t pte) { return pte.pte_low & _PAGE_READ; }
	194	static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
	195	static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
	196	static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
	197	static inline int pte_file(pte_t pte) { return pte.pte_low & _PAGE_FILE; }
	198
1da177e4 LT	199	static inline pte_t pte_wrprotect(pte_t pte)
1da177e4 LT	200	{
6e953891 SS	201	pte.pte_low &= ~(_PAGE_WRITE \| _PAGE_SILENT_WRITE);
6e953891 SS	202	pte.pte_high &= ~_PAGE_SILENT_WRITE;
1da177e4 LT	203	return pte;
	204	}
	205
	206	static inline pte_t pte_rdprotect(pte_t pte)
	207	{
6e953891 SS	208	pte.pte_low &= ~(_PAGE_READ \| _PAGE_SILENT_READ);
6e953891 SS	209	pte.pte_high &= ~_PAGE_SILENT_READ;
1da177e4 LT	210	return pte;
	211	}
	212
	213	static inline pte_t pte_mkclean(pte_t pte)
	214	{
6e953891 SS	215	pte.pte_low &= ~(_PAGE_MODIFIED \| _PAGE_SILENT_WRITE);
6e953891 SS	216	pte.pte_high &= ~_PAGE_SILENT_WRITE;
1da177e4 LT	217	return pte;
	218	}
	219
	220	static inline pte_t pte_mkold(pte_t pte)
	221	{
6e953891 SS	222	pte.pte_low &= ~(_PAGE_ACCESSED \| _PAGE_SILENT_READ);
6e953891 SS	223	pte.pte_high &= ~_PAGE_SILENT_READ;
1da177e4 LT	224	return pte;
	225	}
	226
	227	static inline pte_t pte_mkwrite(pte_t pte)
	228	{
6e953891 SS	229	pte.pte_low \|= _PAGE_WRITE;
	230	if (pte.pte_low & _PAGE_MODIFIED) {
	231	pte.pte_low \|= _PAGE_SILENT_WRITE;
	232	pte.pte_high \|= _PAGE_SILENT_WRITE;
1da177e4 LT	233	}
	234	return pte;
	235	}
	236
	237	static inline pte_t pte_mkread(pte_t pte)
	238	{
6e953891 SS	239	pte.pte_low \|= _PAGE_READ;
	240	if (pte.pte_low & _PAGE_ACCESSED) {
	241	pte.pte_low \|= _PAGE_SILENT_READ;
	242	pte.pte_high \|= _PAGE_SILENT_READ;
1da177e4 LT	243	}
	244	return pte;
	245	}
	246
	247	static inline pte_t pte_mkdirty(pte_t pte)
	248	{
6e953891 SS	249	pte.pte_low \|= _PAGE_MODIFIED;
	250	if (pte.pte_low & _PAGE_WRITE) {
	251	pte.pte_low \|= _PAGE_SILENT_WRITE;
	252	pte.pte_high \|= _PAGE_SILENT_WRITE;
1da177e4 LT	253	}
	254	return pte;
	255	}
	256
	257	static inline pte_t pte_mkyoung(pte_t pte)
	258	{
6e953891 SS	259	pte.pte_low \|= _PAGE_ACCESSED;
	260	if (pte.pte_low & _PAGE_READ)
	261	pte.pte_low \|= _PAGE_SILENT_READ;
	262	pte.pte_high \|= _PAGE_SILENT_READ;
1da177e4 LT	263	return pte;
	264	}
	265	#else
	266	static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_READ; }
	267	static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
	268	static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
	269	static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
	270	static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
	271
	272	static inline pte_t pte_wrprotect(pte_t pte)
	273	{
	274	pte_val(pte) &= ~(_PAGE_WRITE \| _PAGE_SILENT_WRITE);
	275	return pte;
	276	}
	277
	278	static inline pte_t pte_rdprotect(pte_t pte)
	279	{
	280	pte_val(pte) &= ~(_PAGE_READ \| _PAGE_SILENT_READ);
	281	return pte;
	282	}
	283
	284	static inline pte_t pte_mkclean(pte_t pte)
	285	{
	286	pte_val(pte) &= ~(_PAGE_MODIFIED\|_PAGE_SILENT_WRITE);
	287	return pte;
	288	}
	289
	290	static inline pte_t pte_mkold(pte_t pte)
	291	{
	292	pte_val(pte) &= ~(_PAGE_ACCESSED\|_PAGE_SILENT_READ);
	293	return pte;
	294	}
	295
	296	static inline pte_t pte_mkwrite(pte_t pte)
	297	{
	298	pte_val(pte) \|= _PAGE_WRITE;
	299	if (pte_val(pte) & _PAGE_MODIFIED)
	300	pte_val(pte) \|= _PAGE_SILENT_WRITE;
	301	return pte;
	302	}
	303
	304	static inline pte_t pte_mkread(pte_t pte)
	305	{
	306	pte_val(pte) \|= _PAGE_READ;
	307	if (pte_val(pte) & _PAGE_ACCESSED)
	308	pte_val(pte) \|= _PAGE_SILENT_READ;
	309	return pte;
	310	}
	311
	312	static inline pte_t pte_mkdirty(pte_t pte)
	313	{
	314	pte_val(pte) \|= _PAGE_MODIFIED;
	315	if (pte_val(pte) & _PAGE_WRITE)
	316	pte_val(pte) \|= _PAGE_SILENT_WRITE;
	317	return pte;
	318	}
	319
	320	static inline pte_t pte_mkyoung(pte_t pte)
	321	{
	322	pte_val(pte) \|= _PAGE_ACCESSED;
	323	if (pte_val(pte) & _PAGE_READ)
	324	pte_val(pte) \|= _PAGE_SILENT_READ;
	325	return pte;
	326	}
327	#endif
328
329	/*
330	* Macro to make mark a page protection value as "uncacheable". Note
331	* that "protection" is really a misnomer here as the protection value
332	* contains the memory attribute bits, dirty bits, and various other
333	* bits as well.
334	*/
335	#define pgprot_noncached pgprot_noncached
336
337	static inline pgprot_t pgprot_noncached(pgprot_t _prot)
338	{
339	unsigned long prot = pgprot_val(_prot);
340
341	prot = (prot & ~_CACHE_MASK) \| _CACHE_UNCACHED;
342
343	return __pgprot(prot);
344	}
345
346	/*
347	* Conversion functions: convert a page and protection to a page entry,
348	* and a page entry and page directory to the page they refer to.
349	*/
350	#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
351
6e760c8d	352	#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
1da177e4 LT	353	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
1da177e4 LT	354	{
79e0bc37 SS	355	pte.pte_low &= _PAGE_CHG_MASK;
	356	pte.pte_high &= ~0x3f;
	357	pte.pte_low \|= pgprot_val(newprot);
1da177e4 LT	358	pte.pte_high \|= pgprot_val(newprot) & 0x3f;
	359	return pte;
	360	}
	361	#else
	362	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
	363	{
	364	return __pte((pte_val(pte) & _PAGE_CHG_MASK) \| pgprot_val(newprot));
	365	}
	366	#endif
	367
	368
	369	extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
	370	pte_t pte);
	371	extern void __update_cache(struct vm_area_struct *vma, unsigned long address,
	372	pte_t pte);
	373
	374	static inline void update_mmu_cache(struct vm_area_struct *vma,
	375	unsigned long address, pte_t pte)
	376	{
	377	__update_tlb(vma, address, pte);
	378	__update_cache(vma, address, pte);
	379	}
	380
1da177e4	381	#define kern_addr_valid(addr) (1)
1da177e4 LT	382
1da177e4 LT	383	#ifdef CONFIG_64BIT_PHYS_ADDR
1da177e4 LT	384	extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
1da177e4 LT	385
1da177e4 LT	386	static inline int io_remap_pfn_range(struct vm_area_struct *vma,
	387	unsigned long vaddr,
	388	unsigned long pfn,
	389	unsigned long size,
	390	pgprot_t prot)
	391	{
	392	phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
ac5d8c02	393	return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
1da177e4 LT	394	}
1da177e4 LT	395	#else
1da177e4 LT	396	#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
	397	remap_pfn_range(vma, vaddr, pfn, size, prot)
	398	#endif
	399
	400	#define MK_IOSPACE_PFN(space, pfn) (pfn)
	401	#define GET_IOSPACE(pfn) 0
	402	#define GET_PFN(pfn) (pfn)
	403
	404	#include <asm-generic/pgtable.h>
	405
	406	/*
	407	* We provide our own get_unmapped area to cope with the virtual aliasing
	408	* constraints placed on us by the cache architecture.
	409	*/
	410	#define HAVE_ARCH_UNMAPPED_AREA
	411
	412	/*
	413	* No page table caches to initialise
	414	*/
	415	#define pgtable_cache_init() do { } while (0)
	416
	417	#endif /* _ASM_PGTABLE_H */