[deliverable/linux.git] / arch / mips / include / asm / 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

#include <linux/mm_types.h>
#include <linux/mmzone.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_WRITE | (cpu_has_rixi ? 0 : _PAGE_READ) | \
				 _page_cachable_default)
#define PAGE_COPY	__pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | \
				 (cpu_has_rixi ?  _PAGE_NO_EXEC : 0) | _page_cachable_default)
#define PAGE_READONLY	__pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | \
				 _page_cachable_default)
#define PAGE_KERNEL	__pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
				 _PAGE_GLOBAL | _page_cachable_default)
#define PAGE_KERNEL_NC	__pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
				 _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT)
#define PAGE_USERIO	__pgprot(_PAGE_PRESENT | (cpu_has_rixi ? 0 : _PAGE_READ) | _PAGE_WRITE | \
				 _page_cachable_default)
#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT | __READABLE | \
			__WRITEABLE | _PAGE_GLOBAL | _CACHE_UNCACHED)

/*
 * If _PAGE_NO_EXEC is not defined, we can't do page protection for
 * execute, and consider it to be the same as read. Also, write
 * permissions imply read permissions. This is the closest we can get
 * by reasonable means..
 */

/*
 * Dummy values to fill the table in mmap.c
 * The real values will be generated at runtime
 */
#define __P000 __pgprot(0)
#define __P001 __pgprot(0)
#define __P010 __pgprot(0)
#define __P011 __pgprot(0)
#define __P100 __pgprot(0)
#define __P101 __pgprot(0)
#define __P110 __pgprot(0)
#define __P111 __pgprot(0)

#define __S000 __pgprot(0)
#define __S001 __pgprot(0)
#define __S010 __pgprot(0)
#define __S011 __pgprot(0)
#define __S100 __pgprot(0)
#define __S101 __pgprot(0)
#define __S110 __pgprot(0)
#define __S111 __pgprot(0)

extern unsigned long _page_cachable_default;

/*
 * 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((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
#define __HAVE_COLOR_ZERO_PAGE

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)		virt_to_phys((void *)pmd_val(pmd))

#define __pmd_page(pmd)		(pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
#ifndef CONFIG_TRANSPARENT_HUGEPAGE
#define pmd_page(pmd)		__pmd_page(pmd)
#endif /* CONFIG_TRANSPARENT_HUGEPAGE  */

#define pmd_page_vaddr(pmd)	pmd_val(pmd)

#define htw_stop()							\
do {									\
	if (cpu_has_htw)						\
		write_c0_pwctl(read_c0_pwctl() &			\
			       ~(1 << MIPS_PWCTL_PWEN_SHIFT));		\
} while(0)

#define htw_start()							\
do {									\
	if (cpu_has_htw)						\
		write_c0_pwctl(read_c0_pwctl() |			\
			       (1 << MIPS_PWCTL_PWEN_SHIFT));		\
} while(0)


#define htw_reset()							\
do {									\
	if (cpu_has_htw) {						\
		htw_stop();						\
		back_to_back_c0_hazard();				\
		htw_start();						\
		back_to_back_c0_hazard();				\
	}								\
} while(0)

extern void set_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep,
	pte_t pteval);

#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)

#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;

	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;
		}
	}
}

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);
	htw_reset();
}
#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
}

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));
	htw_reset();
}
#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)

#ifndef __PAGETABLE_PMD_FOLDED
/*
 * (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	(__builtin_ffs(sizeof(pgd_t)) - 1)
#define PMD_T_LOG2	(__builtin_ffs(sizeof(pmd_t)) - 1)
#define PTE_T_LOG2	(__builtin_ffs(sizeof(pte_t)) - 1)

/*
 * We used to declare this array with size but gcc 3.3 and older are not able
 * to find that this expression is a constant, so the size is dropped.
 */
extern pgd_t swapper_pg_dir[];

/*
 * The following only work if pte_present() is true.
 * Undefined behaviour if not..
 */
#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
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_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_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_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_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_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 (cpu_has_rixi) {
		if (!(pte_val(pte) & _PAGE_NO_READ))
			pte_val(pte) |= _PAGE_SILENT_READ;
	} else {
		if (pte_val(pte) & _PAGE_READ)
			pte_val(pte) |= _PAGE_SILENT_READ;
	}
	return pte;
}

#ifdef _PAGE_HUGE
static inline int pte_huge(pte_t pte)	{ return pte_val(pte) & _PAGE_HUGE; }

static inline pte_t pte_mkhuge(pte_t pte)
{
	pte_val(pte) |= _PAGE_HUGE;
	return pte;
}
#endif /* _PAGE_HUGE */
#endif
static inline int pte_special(pte_t pte)	{ return 0; }
static inline pte_t pte_mkspecial(pte_t pte)	{ return pte; }

/*
 * 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);
}

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

	/* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */
	prot = (prot & ~_CACHE_MASK) | cpu_data[0].writecombine;

	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)
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);

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

static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
	unsigned long address, pmd_t *pmdp)
{
	pte_t pte = *(pte_t *)pmdp;

	__update_tlb(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);
}
#define io_remap_pfn_range io_remap_pfn_range
#endif

#ifdef CONFIG_TRANSPARENT_HUGEPAGE

extern int has_transparent_hugepage(void);

static inline int pmd_trans_huge(pmd_t pmd)
{
	return !!(pmd_val(pmd) & _PAGE_HUGE);
}

static inline pmd_t pmd_mkhuge(pmd_t pmd)
{
	pmd_val(pmd) |= _PAGE_HUGE;

	return pmd;
}

static inline int pmd_trans_splitting(pmd_t pmd)
{
	return !!(pmd_val(pmd) & _PAGE_SPLITTING);
}

static inline pmd_t pmd_mksplitting(pmd_t pmd)
{
	pmd_val(pmd) |= _PAGE_SPLITTING;

	return pmd;
}

extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
		       pmd_t *pmdp, pmd_t pmd);

#define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
/* Extern to avoid header file madness */
extern void pmdp_splitting_flush(struct vm_area_struct *vma,
					unsigned long address,
					pmd_t *pmdp);

#define __HAVE_ARCH_PMD_WRITE
static inline int pmd_write(pmd_t pmd)
{
	return !!(pmd_val(pmd) & _PAGE_WRITE);
}

static inline pmd_t pmd_wrprotect(pmd_t pmd)
{
	pmd_val(pmd) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
	return pmd;
}

static inline pmd_t pmd_mkwrite(pmd_t pmd)
{
	pmd_val(pmd) |= _PAGE_WRITE;
	if (pmd_val(pmd) & _PAGE_MODIFIED)
		pmd_val(pmd) |= _PAGE_SILENT_WRITE;

	return pmd;
}

static inline int pmd_dirty(pmd_t pmd)
{
	return !!(pmd_val(pmd) & _PAGE_MODIFIED);
}

static inline pmd_t pmd_mkclean(pmd_t pmd)
{
	pmd_val(pmd) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
	return pmd;
}

static inline pmd_t pmd_mkdirty(pmd_t pmd)
{
	pmd_val(pmd) |= _PAGE_MODIFIED;
	if (pmd_val(pmd) & _PAGE_WRITE)
		pmd_val(pmd) |= _PAGE_SILENT_WRITE;

	return pmd;
}

static inline int pmd_young(pmd_t pmd)
{
	return !!(pmd_val(pmd) & _PAGE_ACCESSED);
}

static inline pmd_t pmd_mkold(pmd_t pmd)
{
	pmd_val(pmd) &= ~(_PAGE_ACCESSED|_PAGE_SILENT_READ);

	return pmd;
}

static inline pmd_t pmd_mkyoung(pmd_t pmd)
{
	pmd_val(pmd) |= _PAGE_ACCESSED;

	if (cpu_has_rixi) {
		if (!(pmd_val(pmd) & _PAGE_NO_READ))
			pmd_val(pmd) |= _PAGE_SILENT_READ;
	} else {
		if (pmd_val(pmd) & _PAGE_READ)
			pmd_val(pmd) |= _PAGE_SILENT_READ;
	}

	return pmd;
}

/* Extern to avoid header file madness */
extern pmd_t mk_pmd(struct page *page, pgprot_t prot);

static inline unsigned long pmd_pfn(pmd_t pmd)
{
	return pmd_val(pmd) >> _PFN_SHIFT;
}

static inline struct page *pmd_page(pmd_t pmd)
{
	if (pmd_trans_huge(pmd))
		return pfn_to_page(pmd_pfn(pmd));

	return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
}

static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
{
	pmd_val(pmd) = (pmd_val(pmd) & _PAGE_CHG_MASK) | pgprot_val(newprot);
	return pmd;
}

static inline pmd_t pmd_mknotpresent(pmd_t pmd)
{
	pmd_val(pmd) &= ~(_PAGE_PRESENT | _PAGE_VALID | _PAGE_DIRTY);

	return pmd;
}

/*
 * The generic version pmdp_get_and_clear uses a version of pmd_clear() with a
 * different prototype.
 */
#define __HAVE_ARCH_PMDP_GET_AND_CLEAR
static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm,
				       unsigned long address, pmd_t *pmdp)
{
	pmd_t old = *pmdp;

	pmd_clear(pmdp);

	return old;
}

#endif /* CONFIG_TRANSPARENT_HUGEPAGE */

#include <asm-generic/pgtable.h>

/*
 * uncached accelerated TLB map for video memory access
 */
#ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
#define __HAVE_PHYS_MEM_ACCESS_PROT

struct file;
pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
		unsigned long size, pgprot_t vma_prot);
int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
		unsigned long size, pgprot_t *vma_prot);
#endif

/*
 * 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
#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN

/*
 * 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
5bbea36a	11	#include <linux/mm_types.h>
970d032f	12	#include <linux/mmzone.h>
875d43e7	13	#ifdef CONFIG_32BIT
1da177e4 LT	14	#include <asm/pgtable-32.h>
1da177e4 LT	15	#endif
875d43e7	16	#ifdef CONFIG_64BIT
1da177e4 LT	17	#include <asm/pgtable-64.h>
	18	#endif
	19
f10fae02	20	#include <asm/io.h>
1da177e4 LT	21	#include <asm/pgtable-bits.h>
1da177e4 LT	22
8c65b4a6 TS	23	struct mm_struct;
	24	struct vm_area_struct;
	25
1da177e4	26	#define PAGE_NONE __pgprot(_PAGE_PRESENT \| _CACHE_CACHABLE_NONCOHERENT)
05857c64	27	#define PAGE_SHARED __pgprot(_PAGE_PRESENT \| _PAGE_WRITE \| (cpu_has_rixi ? 0 : _PAGE_READ) \| \
35133692	28	_page_cachable_default)
05857c64 SH	29	#define PAGE_COPY __pgprot(_PAGE_PRESENT \| (cpu_has_rixi ? 0 : _PAGE_READ) \| \
	30	(cpu_has_rixi ? _PAGE_NO_EXEC : 0) \| _page_cachable_default)
	31	#define PAGE_READONLY __pgprot(_PAGE_PRESENT \| (cpu_has_rixi ? 0 : _PAGE_READ) \| \
35133692	32	_page_cachable_default)
1da177e4	33	#define PAGE_KERNEL __pgprot(_PAGE_PRESENT \| __READABLE \| __WRITEABLE \| \
35133692	34	_PAGE_GLOBAL \| _page_cachable_default)
e2a9e5ad PB	35	#define PAGE_KERNEL_NC __pgprot(_PAGE_PRESENT \| __READABLE \| __WRITEABLE \| \
e2a9e5ad PB	36	_PAGE_GLOBAL \| _CACHE_CACHABLE_NONCOHERENT)
05857c64	37	#define PAGE_USERIO __pgprot(_PAGE_PRESENT \| (cpu_has_rixi ? 0 : _PAGE_READ) \| _PAGE_WRITE \| \
35133692	38	_page_cachable_default)
1da177e4 LT	39	#define PAGE_KERNEL_UNCACHED __pgprot(_PAGE_PRESENT \| __READABLE \| \
	40	__WRITEABLE \| _PAGE_GLOBAL \| _CACHE_UNCACHED)
	41
	42	/*
6dd9344c DD	43	* If _PAGE_NO_EXEC is not defined, we can't do page protection for
	44	* execute, and consider it to be the same as read. Also, write
	45	* permissions imply read permissions. This is the closest we can get
	46	* by reasonable means..
1da177e4	47	*/
1da177e4	48
35133692 CD	49	/*
	50	* Dummy values to fill the table in mmap.c
	51	* The real values will be generated at runtime
	52	*/
	53	#define __P000 __pgprot(0)
	54	#define __P001 __pgprot(0)
	55	#define __P010 __pgprot(0)
	56	#define __P011 __pgprot(0)
	57	#define __P100 __pgprot(0)
	58	#define __P101 __pgprot(0)
	59	#define __P110 __pgprot(0)
	60	#define __P111 __pgprot(0)
	61
	62	#define __S000 __pgprot(0)
	63	#define __S001 __pgprot(0)
	64	#define __S010 __pgprot(0)
	65	#define __S011 __pgprot(0)
	66	#define __S100 __pgprot(0)
	67	#define __S101 __pgprot(0)
	68	#define __S110 __pgprot(0)
	69	#define __S111 __pgprot(0)
	70
	71	extern unsigned long _page_cachable_default;
1da177e4 LT	72
	73	/*
	74	* ZERO_PAGE is a global shared page that is always zero; used
	75	* for zero-mapped memory areas etc..
	76	*/
	77
	78	extern unsigned long empty_zero_page;
	79	extern unsigned long zero_page_mask;
	80
	81	#define ZERO_PAGE(vaddr) \
99e3b942	82	(virt_to_page((void *)(empty_zero_page + (((unsigned long)(vaddr)) & zero_page_mask))))
816422ad	83	#define __HAVE_COLOR_ZERO_PAGE
62eede62	84
1da177e4 LT	85	extern void paging_init(void);
	86
	87	/*
	88	* Conversion functions: convert a page and protection to a page entry,
	89	* and a page entry and page directory to the page they refer to.
	90	*/
c9d06962	91	#define pmd_phys(pmd) virt_to_phys((void *)pmd_val(pmd))
970d032f RB	92
	93	#define __pmd_page(pmd) (pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT))
	94	#ifndef CONFIG_TRANSPARENT_HUGEPAGE
	95	#define pmd_page(pmd) __pmd_page(pmd)
	96	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	97
46a82b2d	98	#define pmd_page_vaddr(pmd) pmd_val(pmd)
1da177e4	99
f1014d1b MC	100	#define htw_stop() \
	101	do { \
	102	if (cpu_has_htw) \
	103	write_c0_pwctl(read_c0_pwctl() & \
	104	~(1 << MIPS_PWCTL_PWEN_SHIFT)); \
	105	} while(0)
	106
	107	#define htw_start() \
	108	do { \
	109	if (cpu_has_htw) \
	110	write_c0_pwctl(read_c0_pwctl() \| \
	111	(1 << MIPS_PWCTL_PWEN_SHIFT)); \
	112	} while(0)
	113
	114
	115	#define htw_reset() \
	116	do { \
	117	if (cpu_has_htw) { \
	118	htw_stop(); \
	119	back_to_back_c0_hazard(); \
	120	htw_start(); \
	121	back_to_back_c0_hazard(); \
	122	} \
	123	} while(0)
	124
2a4a8b1e LP	125	extern void set_pte_at(struct mm_struct mm, unsigned long addr, pte_t ptep,
	126	pte_t pteval);
	127
962f480e	128	#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
6e953891 SS	129
	130	#define pte_none(pte) (!(((pte).pte_low \| (pte).pte_high) & ~_PAGE_GLOBAL))
	131	#define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
	132
1da177e4 LT	133	static inline void set_pte(pte_t *ptep, pte_t pte)
	134	{
	135	ptep->pte_high = pte.pte_high;
	136	smp_wmb();
	137	ptep->pte_low = pte.pte_low;
1da177e4	138
6e953891	139	if (pte.pte_low & _PAGE_GLOBAL) {
1da177e4 LT	140	pte_t *buddy = ptep_buddy(ptep);
	141	/*
	142	* Make sure the buddy is global too (if it's !none,
	143	* it better already be global)
	144	*/
6e953891	145	if (pte_none(*buddy)) {
70342287	146	buddy->pte_low \|= _PAGE_GLOBAL;
6e953891 SS	147	buddy->pte_high \|= _PAGE_GLOBAL;
6e953891 SS	148	}
1da177e4 LT	149	}
1da177e4 LT	150	}
1da177e4 LT	151
	152	static inline void pte_clear(struct mm_struct mm, unsigned long addr, pte_t ptep)
	153	{
6e953891 SS	154	pte_t null = __pte(0);
6e953891 SS	155
1da177e4	156	/* Preserve global status for the pair */
6e953891 SS	157	if (ptep_buddy(ptep)->pte_low & _PAGE_GLOBAL)
	158	null.pte_low = null.pte_high = _PAGE_GLOBAL;
	159
	160	set_pte_at(mm, addr, ptep, null);
f1014d1b	161	htw_reset();
1da177e4 LT	162	}
1da177e4 LT	163	#else
6e953891 SS	164
	165	#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
	166	#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
	167
1da177e4 LT	168	/*
	169	* Certain architectures need to do special things when pte's
	170	* within a page table are directly modified. Thus, the following
	171	* hook is made available.
	172	*/
	173	static inline void set_pte(pte_t *ptep, pte_t pteval)
	174	{
	175	*ptep = pteval;
	176	#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
	177	if (pte_val(pteval) & _PAGE_GLOBAL) {
	178	pte_t *buddy = ptep_buddy(ptep);
	179	/*
	180	* Make sure the buddy is global too (if it's !none,
	181	* it better already be global)
	182	*/
	183	if (pte_none(*buddy))
	184	pte_val(buddy) = pte_val(buddy) \| _PAGE_GLOBAL;
	185	}
	186	#endif
	187	}
1da177e4 LT	188
	189	static inline void pte_clear(struct mm_struct mm, unsigned long addr, pte_t ptep)
	190	{
	191	#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
	192	/* Preserve global status for the pair */
	193	if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
	194	set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
	195	else
	196	#endif
	197	set_pte_at(mm, addr, ptep, __pte(0));
f1014d1b	198	htw_reset();
1da177e4 LT	199	}
	200	#endif
	201
	202	/*
c6e8b587	203	* (pmds are folded into puds so this doesn't get actually called,
1da177e4 LT	204	* but the define is needed for a generic inline function.)
	205	*/
	206	#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
c6e8b587	207
325f8a0a	208	#ifndef __PAGETABLE_PMD_FOLDED
c6e8b587 RB	209	/*
	210	* (puds are folded into pgds so this doesn't get actually called,
	211	* but the define is needed for a generic inline function.)
	212	*/
	213	#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
	214	#endif
1da177e4	215
5ff97472 RB	216	#define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
	217	#define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
	218	#define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
1da177e4	219
9975e77d RB	220	/*
	221	* We used to declare this array with size but gcc 3.3 and older are not able
	222	* to find that this expression is a constant, so the size is dropped.
	223	*/
	224	extern pgd_t swapper_pg_dir[];
1da177e4 LT	225
	226	/*
	227	* The following only work if pte_present() is true.
	228	* Undefined behaviour if not..
	229	*/
962f480e	230	#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
6e953891 SS	231	static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
	232	static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
	233	static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
	234	static inline int pte_file(pte_t pte) { return pte.pte_low & _PAGE_FILE; }
	235
1da177e4 LT	236	static inline pte_t pte_wrprotect(pte_t pte)
1da177e4 LT	237	{
6e953891 SS	238	pte.pte_low &= ~(_PAGE_WRITE \| _PAGE_SILENT_WRITE);
6e953891 SS	239	pte.pte_high &= ~_PAGE_SILENT_WRITE;
1da177e4 LT	240	return pte;
	241	}
	242
1da177e4 LT	243	static inline pte_t pte_mkclean(pte_t pte)
1da177e4 LT	244	{
6e953891 SS	245	pte.pte_low &= ~(_PAGE_MODIFIED \| _PAGE_SILENT_WRITE);
6e953891 SS	246	pte.pte_high &= ~_PAGE_SILENT_WRITE;
1da177e4 LT	247	return pte;
	248	}
	249
	250	static inline pte_t pte_mkold(pte_t pte)
	251	{
6e953891 SS	252	pte.pte_low &= ~(_PAGE_ACCESSED \| _PAGE_SILENT_READ);
6e953891 SS	253	pte.pte_high &= ~_PAGE_SILENT_READ;
1da177e4 LT	254	return pte;
	255	}
	256
	257	static inline pte_t pte_mkwrite(pte_t pte)
	258	{
6e953891 SS	259	pte.pte_low \|= _PAGE_WRITE;
	260	if (pte.pte_low & _PAGE_MODIFIED) {
	261	pte.pte_low \|= _PAGE_SILENT_WRITE;
	262	pte.pte_high \|= _PAGE_SILENT_WRITE;
1da177e4 LT	263	}
	264	return pte;
	265	}
	266
1da177e4 LT	267	static inline pte_t pte_mkdirty(pte_t pte)
1da177e4 LT	268	{
6e953891 SS	269	pte.pte_low \|= _PAGE_MODIFIED;
	270	if (pte.pte_low & _PAGE_WRITE) {
	271	pte.pte_low \|= _PAGE_SILENT_WRITE;
	272	pte.pte_high \|= _PAGE_SILENT_WRITE;
1da177e4 LT	273	}
	274	return pte;
	275	}
	276
	277	static inline pte_t pte_mkyoung(pte_t pte)
	278	{
6e953891	279	pte.pte_low \|= _PAGE_ACCESSED;
057229f9	280	if (pte.pte_low & _PAGE_READ) {
6e953891 SS	281	pte.pte_low \|= _PAGE_SILENT_READ;
6e953891 SS	282	pte.pte_high \|= _PAGE_SILENT_READ;
057229f9	283	}
1da177e4 LT	284	return pte;
	285	}
	286	#else
1da177e4 LT	287	static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
	288	static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
	289	static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
	290	static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
	291
	292	static inline pte_t pte_wrprotect(pte_t pte)
	293	{
	294	pte_val(pte) &= ~(_PAGE_WRITE \| _PAGE_SILENT_WRITE);
	295	return pte;
	296	}
	297
1da177e4 LT	298	static inline pte_t pte_mkclean(pte_t pte)
	299	{
	300	pte_val(pte) &= ~(_PAGE_MODIFIED\|_PAGE_SILENT_WRITE);
	301	return pte;
	302	}
	303
	304	static inline pte_t pte_mkold(pte_t pte)
	305	{
	306	pte_val(pte) &= ~(_PAGE_ACCESSED\|_PAGE_SILENT_READ);
	307	return pte;
	308	}
	309
	310	static inline pte_t pte_mkwrite(pte_t pte)
	311	{
	312	pte_val(pte) \|= _PAGE_WRITE;
	313	if (pte_val(pte) & _PAGE_MODIFIED)
	314	pte_val(pte) \|= _PAGE_SILENT_WRITE;
	315	return pte;
	316	}
	317
1da177e4 LT	318	static inline pte_t pte_mkdirty(pte_t pte)
	319	{
	320	pte_val(pte) \|= _PAGE_MODIFIED;
	321	if (pte_val(pte) & _PAGE_WRITE)
	322	pte_val(pte) \|= _PAGE_SILENT_WRITE;
	323	return pte;
	324	}
	325
	326	static inline pte_t pte_mkyoung(pte_t pte)
	327	{
	328	pte_val(pte) \|= _PAGE_ACCESSED;
05857c64	329	if (cpu_has_rixi) {
6dd9344c DD	330	if (!(pte_val(pte) & _PAGE_NO_READ))
	331	pte_val(pte) \|= _PAGE_SILENT_READ;
	332	} else {
	333	if (pte_val(pte) & _PAGE_READ)
	334	pte_val(pte) \|= _PAGE_SILENT_READ;
	335	}
1da177e4 LT	336	return pte;
1da177e4 LT	337	}
dd794392 DD	338
	339	#ifdef _PAGE_HUGE
	340	static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
	341
	342	static inline pte_t pte_mkhuge(pte_t pte)
	343	{
	344	pte_val(pte) \|= _PAGE_HUGE;
	345	return pte;
	346	}
	347	#endif /* _PAGE_HUGE */
1da177e4	348	#endif
7e675137 NP	349	static inline int pte_special(pte_t pte) { return 0; }
7e675137 NP	350	static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
1da177e4 LT	351
1da177e4 LT	352	/*
70342287	353	* Macro to make mark a page protection value as "uncacheable". Note
1da177e4 LT	354	* that "protection" is really a misnomer here as the protection value
	355	* contains the memory attribute bits, dirty bits, and various other
	356	* bits as well.
	357	*/
	358	#define pgprot_noncached pgprot_noncached
	359
	360	static inline pgprot_t pgprot_noncached(pgprot_t _prot)
	361	{
	362	unsigned long prot = pgprot_val(_prot);
	363
	364	prot = (prot & ~_CACHE_MASK) \| _CACHE_UNCACHED;
	365
	366	return __pgprot(prot);
	367	}
	368
4b050ba7 MC	369	static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
	370	{
	371	unsigned long prot = pgprot_val(_prot);
	372
	373	/* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */
	374	prot = (prot & ~_CACHE_MASK) \| cpu_data[0].writecombine;
	375
	376	return __pgprot(prot);
	377	}
	378
1da177e4 LT	379	/*
	380	* Conversion functions: convert a page and protection to a page entry,
	381	* and a page entry and page directory to the page they refer to.
	382	*/
	383	#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
	384
962f480e	385	#if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32)
1da177e4 LT	386	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
1da177e4 LT	387	{
79e0bc37 SS	388	pte.pte_low &= _PAGE_CHG_MASK;
	389	pte.pte_high &= ~0x3f;
	390	pte.pte_low \|= pgprot_val(newprot);
1da177e4 LT	391	pte.pte_high \|= pgprot_val(newprot) & 0x3f;
	392	return pte;
	393	}
	394	#else
	395	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
	396	{
	397	return __pte((pte_val(pte) & _PAGE_CHG_MASK) \| pgprot_val(newprot));
	398	}
	399	#endif
	400
	401
	402	extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
	403	pte_t pte);
1da177e4 LT	404
1da177e4 LT	405	static inline void update_mmu_cache(struct vm_area_struct *vma,
4b3073e1	406	unsigned long address, pte_t *ptep)
1da177e4	407	{
4b3073e1	408	pte_t pte = *ptep;
1da177e4	409	__update_tlb(vma, address, pte);
1da177e4 LT	410	}
1da177e4 LT	411
970d032f RB	412	static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
	413	unsigned long address, pmd_t *pmdp)
	414	{
	415	pte_t pte = (pte_t )pmdp;
	416
	417	__update_tlb(vma, address, pte);
	418	}
	419
1da177e4	420	#define kern_addr_valid(addr) (1)
1da177e4 LT	421
1da177e4 LT	422	#ifdef CONFIG_64BIT_PHYS_ADDR
1da177e4 LT	423	extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
1da177e4 LT	424
1da177e4 LT	425	static inline int io_remap_pfn_range(struct vm_area_struct *vma,
	426	unsigned long vaddr,
	427	unsigned long pfn,
	428	unsigned long size,
	429	pgprot_t prot)
	430	{
	431	phys_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
ac5d8c02	432	return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
1da177e4	433	}
40d158e6	434	#define io_remap_pfn_range io_remap_pfn_range
1da177e4 LT	435	#endif
1da177e4 LT	436
970d032f RB	437	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	438
	439	extern int has_transparent_hugepage(void);
	440
	441	static inline int pmd_trans_huge(pmd_t pmd)
	442	{
	443	return !!(pmd_val(pmd) & _PAGE_HUGE);
	444	}
	445
	446	static inline pmd_t pmd_mkhuge(pmd_t pmd)
	447	{
	448	pmd_val(pmd) \|= _PAGE_HUGE;
	449
	450	return pmd;
	451	}
	452
	453	static inline int pmd_trans_splitting(pmd_t pmd)
	454	{
	455	return !!(pmd_val(pmd) & _PAGE_SPLITTING);
	456	}
	457
	458	static inline pmd_t pmd_mksplitting(pmd_t pmd)
	459	{
	460	pmd_val(pmd) \|= _PAGE_SPLITTING;
	461
	462	return pmd;
	463	}
	464
	465	extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
	466	pmd_t *pmdp, pmd_t pmd);
	467
	468	#define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
	469	/* Extern to avoid header file madness */
	470	extern void pmdp_splitting_flush(struct vm_area_struct *vma,
	471	unsigned long address,
	472	pmd_t *pmdp);
	473
	474	#define __HAVE_ARCH_PMD_WRITE
	475	static inline int pmd_write(pmd_t pmd)
	476	{
	477	return !!(pmd_val(pmd) & _PAGE_WRITE);
	478	}
	479
	480	static inline pmd_t pmd_wrprotect(pmd_t pmd)
	481	{
	482	pmd_val(pmd) &= ~(_PAGE_WRITE \| _PAGE_SILENT_WRITE);
	483	return pmd;
	484	}
	485
	486	static inline pmd_t pmd_mkwrite(pmd_t pmd)
	487	{
	488	pmd_val(pmd) \|= _PAGE_WRITE;
	489	if (pmd_val(pmd) & _PAGE_MODIFIED)
	490	pmd_val(pmd) \|= _PAGE_SILENT_WRITE;
	491
	492	return pmd;
	493	}
	494
	495	static inline int pmd_dirty(pmd_t pmd)
	496	{
	497	return !!(pmd_val(pmd) & _PAGE_MODIFIED);
	498	}
	499
	500	static inline pmd_t pmd_mkclean(pmd_t pmd)
501	{
502	pmd_val(pmd) &= ~(_PAGE_MODIFIED \| _PAGE_SILENT_WRITE);
503	return pmd;
504	}
505
506	static inline pmd_t pmd_mkdirty(pmd_t pmd)
507	{
508	pmd_val(pmd) \|= _PAGE_MODIFIED;
509	if (pmd_val(pmd) & _PAGE_WRITE)
510	pmd_val(pmd) \|= _PAGE_SILENT_WRITE;
511
512	return pmd;
513	}
514
515	static inline int pmd_young(pmd_t pmd)
516	{
517	return !!(pmd_val(pmd) & _PAGE_ACCESSED);
518	}
519
520	static inline pmd_t pmd_mkold(pmd_t pmd)
521	{
522	pmd_val(pmd) &= ~(_PAGE_ACCESSED\|_PAGE_SILENT_READ);
523
524	return pmd;
525	}
526
527	static inline pmd_t pmd_mkyoung(pmd_t pmd)
528	{
529	pmd_val(pmd) \|= _PAGE_ACCESSED;
530
531	if (cpu_has_rixi) {
532	if (!(pmd_val(pmd) & _PAGE_NO_READ))
533	pmd_val(pmd) \|= _PAGE_SILENT_READ;
534	} else {
535	if (pmd_val(pmd) & _PAGE_READ)
536	pmd_val(pmd) \|= _PAGE_SILENT_READ;
537	}
538
539	return pmd;
540	}
541
542	/* Extern to avoid header file madness */
543	extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
544
545	static inline unsigned long pmd_pfn(pmd_t pmd)
546	{
547	return pmd_val(pmd) >> _PFN_SHIFT;
548	}
549
550	static inline struct page *pmd_page(pmd_t pmd)
551	{
552	if (pmd_trans_huge(pmd))
553	return pfn_to_page(pmd_pfn(pmd));
554
555	return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
556	}
557
558	static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
559	{
560	pmd_val(pmd) = (pmd_val(pmd) & _PAGE_CHG_MASK) \| pgprot_val(newprot);
561	return pmd;
562	}
563
564	static inline pmd_t pmd_mknotpresent(pmd_t pmd)
565	{
566	pmd_val(pmd) &= ~(_PAGE_PRESENT \| _PAGE_VALID \| _PAGE_DIRTY);
567
568	return pmd;
569	}
570
571	/*
572	* The generic version pmdp_get_and_clear uses a version of pmd_clear() with a
573	* different prototype.
574	*/
575	#define __HAVE_ARCH_PMDP_GET_AND_CLEAR
576	static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm,
577	unsigned long address, pmd_t *pmdp)
578	{
579	pmd_t old = *pmdp;
580
581	pmd_clear(pmdp);
582
583	return old;
584	}
585
586	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
587
1da177e4 LT	588	#include <asm-generic/pgtable.h>
1da177e4 LT	589
22f1fdfd WZ	590	/*
	591	* uncached accelerated TLB map for video memory access
	592	*/
	593	#ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
	594	#define __HAVE_PHYS_MEM_ACCESS_PROT
	595
	596	struct file;
	597	pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
	598	unsigned long size, pgprot_t vma_prot);
	599	int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
	600	unsigned long size, pgprot_t *vma_prot);
	601	#endif
	602
1da177e4 LT	603	/*
	604	* We provide our own get_unmapped area to cope with the virtual aliasing
	605	* constraints placed on us by the cache architecture.
	606	*/
	607	#define HAVE_ARCH_UNMAPPED_AREA
d0be89f6	608	#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
1da177e4 LT	609
	610	/*
	611	* No page table caches to initialise
	612	*/
	613	#define pgtable_cache_init() do { } while (0)
	614
	615	#endif /* _ASM_PGTABLE_H */