[mirror_ubuntu-artful-kernel.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 | _PAGE_READ | \
				 _page_cachable_default)
#define PAGE_COPY	__pgprot(_PAGE_PRESENT | _PAGE_READ | _PAGE_NO_EXEC | \
				 _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_KERNEL_NC	__pgprot(_PAGE_PRESENT | __READABLE | __WRITEABLE | \
				 _PAGE_GLOBAL | _CACHE_CACHABLE_NONCOHERENT)
#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)

/*
 * 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 {									\
	unsigned long flags;						\
									\
	if (cpu_has_htw) {						\
		local_irq_save(flags);					\
		if(!raw_current_cpu_data.htw_seq++) {			\
			write_c0_pwctl(read_c0_pwctl() &		\
				       ~(1 << MIPS_PWCTL_PWEN_SHIFT));	\
			back_to_back_c0_hazard();			\
		}							\
		local_irq_restore(flags);				\
	}								\
} while(0)

#define htw_start()							\
do {									\
	unsigned long flags;						\
									\
	if (cpu_has_htw) {						\
		local_irq_save(flags);					\
		if (!--raw_current_cpu_data.htw_seq) {			\
			write_c0_pwctl(read_c0_pwctl() |		\
				       (1 << MIPS_PWCTL_PWEN_SHIFT));	\
			back_to_back_c0_hazard();			\
		}							\
		local_irq_restore(flags);				\
	}								\
} while(0)


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

#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)

#define pte_none(pte)		(!(((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_high & _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_high |= _PAGE_GLOBAL;
	}
}

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

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

	set_pte_at(mm, addr, ptep, null);
	htw_start();
}
#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)
{
	htw_stop();
#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_start();
}
#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_PHYS_ADDR_T_64BIT) && 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 pte_t pte_wrprotect(pte_t pte)
{
	pte.pte_low  &= ~_PAGE_WRITE;
	pte.pte_high &= ~_PAGE_SILENT_WRITE;
	return pte;
}

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

static inline pte_t pte_mkold(pte_t pte)
{
	pte.pte_low  &= ~_PAGE_ACCESSED;
	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_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_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_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 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;
#ifdef CONFIG_CPU_MIPSR2
	if (!(pte_val(pte) & _PAGE_NO_READ))
		pte_val(pte) |= _PAGE_SILENT_READ;
	else
#endif
	if (pte_val(pte) & _PAGE_READ)
		pte_val(pte) |= _PAGE_SILENT_READ;
	return pte;
}

#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
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 /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
#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_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
	pte.pte_low  &= (_PAGE_MODIFIED | _PAGE_ACCESSED | _PFNX_MASK);
	pte.pte_high &= (_PFN_MASK | _CACHE_MASK);
	pte.pte_low  |= pgprot_val(newprot) & ~_PFNX_MASK;
	pte.pte_high |= pgprot_val(newprot) & ~_PFN_MASK;
	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_PHYS_ADDR_T_64BIT
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_addr_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;

#ifdef CONFIG_CPU_MIPSR2
	if (!(pmd_val(pmd) & _PAGE_NO_READ))
		pmd_val(pmd) |= _PAGE_SILENT_READ;
	else
#endif
	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)
be0c37c9	27	#define PAGE_SHARED __pgprot(_PAGE_PRESENT \| _PAGE_WRITE \| _PAGE_READ \| \
35133692	28	_page_cachable_default)
be0c37c9 SH	29	#define PAGE_COPY __pgprot(_PAGE_PRESENT \| _PAGE_READ \| _PAGE_NO_EXEC \| \
	30	_page_cachable_default)
	31	#define PAGE_READONLY __pgprot(_PAGE_PRESENT \| _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)
be0c37c9	37	#define PAGE_USERIO __pgprot(_PAGE_PRESENT \| _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() \
f1014d1b MC	101	do { \
ed4cbc81 MC	102	unsigned long flags; \
ed4cbc81 MC	103	\
461d1597	104	if (cpu_has_htw) { \
ed4cbc81 MC	105	local_irq_save(flags); \
	106	if(!raw_current_cpu_data.htw_seq++) { \
	107	write_c0_pwctl(read_c0_pwctl() & \
	108	~(1 << MIPS_PWCTL_PWEN_SHIFT)); \
	109	back_to_back_c0_hazard(); \
	110	} \
	111	local_irq_restore(flags); \
461d1597	112	} \
f1014d1b MC	113	} while(0)
	114
	115	#define htw_start() \
	116	do { \
ed4cbc81 MC	117	unsigned long flags; \
ed4cbc81 MC	118	\
f1014d1b	119	if (cpu_has_htw) { \
ed4cbc81 MC	120	local_irq_save(flags); \
	121	if (!--raw_current_cpu_data.htw_seq) { \
	122	write_c0_pwctl(read_c0_pwctl() \| \
	123	(1 << MIPS_PWCTL_PWEN_SHIFT)); \
	124	back_to_back_c0_hazard(); \
	125	} \
	126	local_irq_restore(flags); \
f1014d1b MC	127	} \
	128	} while(0)
	129
f1014d1b	130
2a4a8b1e LP	131	extern void set_pte_at(struct mm_struct mm, unsigned long addr, pte_t ptep,
	132	pte_t pteval);
	133
34adb28d	134	#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
6e953891	135
c5b36783	136	#define pte_none(pte) (!(((pte).pte_high) & ~_PAGE_GLOBAL))
6e953891 SS	137	#define pte_present(pte) ((pte).pte_low & _PAGE_PRESENT)
6e953891 SS	138
1da177e4 LT	139	static inline void set_pte(pte_t *ptep, pte_t pte)
	140	{
	141	ptep->pte_high = pte.pte_high;
	142	smp_wmb();
	143	ptep->pte_low = pte.pte_low;
1da177e4	144
c5b36783	145	if (pte.pte_high & _PAGE_GLOBAL) {
1da177e4 LT	146	pte_t *buddy = ptep_buddy(ptep);
	147	/*
	148	* Make sure the buddy is global too (if it's !none,
	149	* it better already be global)
	150	*/
c5b36783	151	if (pte_none(*buddy))
6e953891	152	buddy->pte_high \|= _PAGE_GLOBAL;
1da177e4 LT	153	}
1da177e4 LT	154	}
1da177e4 LT	155
	156	static inline void pte_clear(struct mm_struct mm, unsigned long addr, pte_t ptep)
	157	{
6e953891 SS	158	pte_t null = __pte(0);
6e953891 SS	159
fde3538a	160	htw_stop();
1da177e4	161	/* Preserve global status for the pair */
c5b36783 SH	162	if (ptep_buddy(ptep)->pte_high & _PAGE_GLOBAL)
c5b36783 SH	163	null.pte_high = _PAGE_GLOBAL;
6e953891 SS	164
6e953891 SS	165	set_pte_at(mm, addr, ptep, null);
fde3538a	166	htw_start();
1da177e4 LT	167	}
1da177e4 LT	168	#else
6e953891 SS	169
	170	#define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL))
	171	#define pte_present(pte) (pte_val(pte) & _PAGE_PRESENT)
	172
1da177e4 LT	173	/*
	174	* Certain architectures need to do special things when pte's
	175	* within a page table are directly modified. Thus, the following
	176	* hook is made available.
	177	*/
	178	static inline void set_pte(pte_t *ptep, pte_t pteval)
	179	{
	180	*ptep = pteval;
	181	#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
	182	if (pte_val(pteval) & _PAGE_GLOBAL) {
	183	pte_t *buddy = ptep_buddy(ptep);
	184	/*
	185	* Make sure the buddy is global too (if it's !none,
	186	* it better already be global)
	187	*/
	188	if (pte_none(*buddy))
	189	pte_val(buddy) = pte_val(buddy) \| _PAGE_GLOBAL;
	190	}
	191	#endif
	192	}
1da177e4 LT	193
	194	static inline void pte_clear(struct mm_struct mm, unsigned long addr, pte_t ptep)
	195	{
fde3538a	196	htw_stop();
1da177e4 LT	197	#if !defined(CONFIG_CPU_R3000) && !defined(CONFIG_CPU_TX39XX)
	198	/* Preserve global status for the pair */
	199	if (pte_val(*ptep_buddy(ptep)) & _PAGE_GLOBAL)
	200	set_pte_at(mm, addr, ptep, __pte(_PAGE_GLOBAL));
	201	else
	202	#endif
	203	set_pte_at(mm, addr, ptep, __pte(0));
fde3538a	204	htw_start();
1da177e4 LT	205	}
	206	#endif
	207
	208	/*
c6e8b587	209	* (pmds are folded into puds so this doesn't get actually called,
1da177e4 LT	210	* but the define is needed for a generic inline function.)
	211	*/
	212	#define set_pmd(pmdptr, pmdval) do { *(pmdptr) = (pmdval); } while(0)
c6e8b587	213
325f8a0a	214	#ifndef __PAGETABLE_PMD_FOLDED
c6e8b587 RB	215	/*
	216	* (puds are folded into pgds so this doesn't get actually called,
	217	* but the define is needed for a generic inline function.)
	218	*/
	219	#define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
	220	#endif
1da177e4	221
5ff97472 RB	222	#define PGD_T_LOG2 (__builtin_ffs(sizeof(pgd_t)) - 1)
	223	#define PMD_T_LOG2 (__builtin_ffs(sizeof(pmd_t)) - 1)
	224	#define PTE_T_LOG2 (__builtin_ffs(sizeof(pte_t)) - 1)
1da177e4	225
9975e77d RB	226	/*
	227	* We used to declare this array with size but gcc 3.3 and older are not able
	228	* to find that this expression is a constant, so the size is dropped.
	229	*/
	230	extern pgd_t swapper_pg_dir[];
1da177e4 LT	231
	232	/*
	233	* The following only work if pte_present() is true.
	234	* Undefined behaviour if not..
	235	*/
34adb28d	236	#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
6e953891 SS	237	static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
	238	static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
	239	static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
6e953891	240
1da177e4 LT	241	static inline pte_t pte_wrprotect(pte_t pte)
1da177e4 LT	242	{
c5b36783	243	pte.pte_low &= ~_PAGE_WRITE;
6e953891	244	pte.pte_high &= ~_PAGE_SILENT_WRITE;
1da177e4 LT	245	return pte;
	246	}
	247
1da177e4 LT	248	static inline pte_t pte_mkclean(pte_t pte)
1da177e4 LT	249	{
c5b36783	250	pte.pte_low &= ~_PAGE_MODIFIED;
6e953891	251	pte.pte_high &= ~_PAGE_SILENT_WRITE;
1da177e4 LT	252	return pte;
	253	}
	254
	255	static inline pte_t pte_mkold(pte_t pte)
	256	{
c5b36783	257	pte.pte_low &= ~_PAGE_ACCESSED;
6e953891	258	pte.pte_high &= ~_PAGE_SILENT_READ;
1da177e4 LT	259	return pte;
	260	}
	261
	262	static inline pte_t pte_mkwrite(pte_t pte)
	263	{
6e953891	264	pte.pte_low \|= _PAGE_WRITE;
c5b36783	265	if (pte.pte_low & _PAGE_MODIFIED)
6e953891	266	pte.pte_high \|= _PAGE_SILENT_WRITE;
1da177e4 LT	267	return pte;
	268	}
	269
1da177e4 LT	270	static inline pte_t pte_mkdirty(pte_t pte)
1da177e4 LT	271	{
6e953891	272	pte.pte_low \|= _PAGE_MODIFIED;
c5b36783	273	if (pte.pte_low & _PAGE_WRITE)
6e953891	274	pte.pte_high \|= _PAGE_SILENT_WRITE;
1da177e4 LT	275	return pte;
	276	}
	277
	278	static inline pte_t pte_mkyoung(pte_t pte)
	279	{
6e953891	280	pte.pte_low \|= _PAGE_ACCESSED;
c5b36783	281	if (pte.pte_low & _PAGE_READ)
6e953891	282	pte.pte_high \|= _PAGE_SILENT_READ;
1da177e4 LT	283	return pte;
	284	}
	285	#else
1da177e4 LT	286	static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
	287	static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
	288	static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
1da177e4 LT	289
	290	static inline pte_t pte_wrprotect(pte_t pte)
	291	{
	292	pte_val(pte) &= ~(_PAGE_WRITE \| _PAGE_SILENT_WRITE);
	293	return pte;
	294	}
	295
1da177e4 LT	296	static inline pte_t pte_mkclean(pte_t pte)
1da177e4 LT	297	{
77a5c593	298	pte_val(pte) &= ~(_PAGE_MODIFIED \| _PAGE_SILENT_WRITE);
1da177e4 LT	299	return pte;
	300	}
	301
	302	static inline pte_t pte_mkold(pte_t pte)
	303	{
77a5c593	304	pte_val(pte) &= ~(_PAGE_ACCESSED \| _PAGE_SILENT_READ);
1da177e4 LT	305	return pte;
	306	}
	307
	308	static inline pte_t pte_mkwrite(pte_t pte)
	309	{
	310	pte_val(pte) \|= _PAGE_WRITE;
	311	if (pte_val(pte) & _PAGE_MODIFIED)
	312	pte_val(pte) \|= _PAGE_SILENT_WRITE;
	313	return pte;
	314	}
	315
1da177e4 LT	316	static inline pte_t pte_mkdirty(pte_t pte)
	317	{
	318	pte_val(pte) \|= _PAGE_MODIFIED;
	319	if (pte_val(pte) & _PAGE_WRITE)
	320	pte_val(pte) \|= _PAGE_SILENT_WRITE;
	321	return pte;
	322	}
	323
	324	static inline pte_t pte_mkyoung(pte_t pte)
	325	{
	326	pte_val(pte) \|= _PAGE_ACCESSED;
be0c37c9 SH	327	#ifdef CONFIG_CPU_MIPSR2
	328	if (!(pte_val(pte) & _PAGE_NO_READ))
	329	pte_val(pte) \|= _PAGE_SILENT_READ;
	330	else
	331	#endif
	332	if (pte_val(pte) & _PAGE_READ)
	333	pte_val(pte) \|= _PAGE_SILENT_READ;
1da177e4 LT	334	return pte;
1da177e4 LT	335	}
dd794392	336
05f9883a	337	#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
dd794392 DD	338	static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }
	339
	340	static inline pte_t pte_mkhuge(pte_t pte)
	341	{
	342	pte_val(pte) \|= _PAGE_HUGE;
	343	return pte;
	344	}
05f9883a	345	#endif /* CONFIG_MIPS_HUGE_TLB_SUPPORT */
1da177e4	346	#endif
7e675137 NP	347	static inline int pte_special(pte_t pte) { return 0; }
7e675137 NP	348	static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
1da177e4 LT	349
1da177e4 LT	350	/*
70342287	351	* Macro to make mark a page protection value as "uncacheable". Note
1da177e4 LT	352	* that "protection" is really a misnomer here as the protection value
	353	* contains the memory attribute bits, dirty bits, and various other
	354	* bits as well.
	355	*/
	356	#define pgprot_noncached pgprot_noncached
	357
	358	static inline pgprot_t pgprot_noncached(pgprot_t _prot)
	359	{
	360	unsigned long prot = pgprot_val(_prot);
	361
	362	prot = (prot & ~_CACHE_MASK) \| _CACHE_UNCACHED;
	363
	364	return __pgprot(prot);
	365	}
	366
4b050ba7 MC	367	static inline pgprot_t pgprot_writecombine(pgprot_t _prot)
	368	{
	369	unsigned long prot = pgprot_val(_prot);
	370
	371	/* cpu_data[0].writecombine is already shifted by _CACHE_SHIFT */
	372	prot = (prot & ~_CACHE_MASK) \| cpu_data[0].writecombine;
	373
	374	return __pgprot(prot);
	375	}
	376
1da177e4 LT	377	/*
	378	* Conversion functions: convert a page and protection to a page entry,
	379	* and a page entry and page directory to the page they refer to.
	380	*/
	381	#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
	382
34adb28d	383	#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
1da177e4 LT	384	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
1da177e4 LT	385	{
c5b36783	386	pte.pte_low &= (_PAGE_MODIFIED \| _PAGE_ACCESSED \| _PFNX_MASK);
77a5c593	387	pte.pte_high &= (_PFN_MASK \| _CACHE_MASK);
c5b36783 SH	388	pte.pte_low \|= pgprot_val(newprot) & ~_PFNX_MASK;
c5b36783 SH	389	pte.pte_high \|= pgprot_val(newprot) & ~_PFN_MASK;
1da177e4 LT	390	return pte;
	391	}
	392	#else
	393	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
	394	{
	395	return __pte((pte_val(pte) & _PAGE_CHG_MASK) \| pgprot_val(newprot));
	396	}
	397	#endif
	398
	399
	400	extern void __update_tlb(struct vm_area_struct *vma, unsigned long address,
	401	pte_t pte);
1da177e4 LT	402
1da177e4 LT	403	static inline void update_mmu_cache(struct vm_area_struct *vma,
4b3073e1	404	unsigned long address, pte_t *ptep)
1da177e4	405	{
4b3073e1	406	pte_t pte = *ptep;
1da177e4	407	__update_tlb(vma, address, pte);
1da177e4 LT	408	}
1da177e4 LT	409
970d032f RB	410	static inline void update_mmu_cache_pmd(struct vm_area_struct *vma,
	411	unsigned long address, pmd_t *pmdp)
	412	{
	413	pte_t pte = (pte_t )pmdp;
	414
	415	__update_tlb(vma, address, pte);
	416	}
	417
1da177e4	418	#define kern_addr_valid(addr) (1)
1da177e4	419
34adb28d	420	#ifdef CONFIG_PHYS_ADDR_T_64BIT
1da177e4 LT	421	extern int remap_pfn_range(struct vm_area_struct *vma, unsigned long from, unsigned long pfn, unsigned long size, pgprot_t prot);
1da177e4 LT	422
1da177e4 LT	423	static inline int io_remap_pfn_range(struct vm_area_struct *vma,
	424	unsigned long vaddr,
	425	unsigned long pfn,
	426	unsigned long size,
	427	pgprot_t prot)
	428	{
15d45cce	429	phys_addr_t phys_addr_high = fixup_bigphys_addr(pfn << PAGE_SHIFT, size);
ac5d8c02	430	return remap_pfn_range(vma, vaddr, phys_addr_high >> PAGE_SHIFT, size, prot);
1da177e4	431	}
40d158e6	432	#define io_remap_pfn_range io_remap_pfn_range
1da177e4 LT	433	#endif
1da177e4 LT	434
970d032f RB	435	#ifdef CONFIG_TRANSPARENT_HUGEPAGE
	436
	437	extern int has_transparent_hugepage(void);
	438
	439	static inline int pmd_trans_huge(pmd_t pmd)
	440	{
	441	return !!(pmd_val(pmd) & _PAGE_HUGE);
	442	}
	443
	444	static inline pmd_t pmd_mkhuge(pmd_t pmd)
	445	{
	446	pmd_val(pmd) \|= _PAGE_HUGE;
	447
	448	return pmd;
	449	}
	450
	451	static inline int pmd_trans_splitting(pmd_t pmd)
	452	{
	453	return !!(pmd_val(pmd) & _PAGE_SPLITTING);
	454	}
	455
	456	static inline pmd_t pmd_mksplitting(pmd_t pmd)
	457	{
	458	pmd_val(pmd) \|= _PAGE_SPLITTING;
	459
	460	return pmd;
	461	}
	462
	463	extern void set_pmd_at(struct mm_struct *mm, unsigned long addr,
	464	pmd_t *pmdp, pmd_t pmd);
	465
	466	#define __HAVE_ARCH_PMDP_SPLITTING_FLUSH
	467	/* Extern to avoid header file madness */
	468	extern void pmdp_splitting_flush(struct vm_area_struct *vma,
	469	unsigned long address,
	470	pmd_t *pmdp);
	471
	472	#define __HAVE_ARCH_PMD_WRITE
	473	static inline int pmd_write(pmd_t pmd)
	474	{
	475	return !!(pmd_val(pmd) & _PAGE_WRITE);
	476	}
	477
	478	static inline pmd_t pmd_wrprotect(pmd_t pmd)
	479	{
	480	pmd_val(pmd) &= ~(_PAGE_WRITE \| _PAGE_SILENT_WRITE);
	481	return pmd;
	482	}
	483
	484	static inline pmd_t pmd_mkwrite(pmd_t pmd)
	485	{
	486	pmd_val(pmd) \|= _PAGE_WRITE;
	487	if (pmd_val(pmd) & _PAGE_MODIFIED)
	488	pmd_val(pmd) \|= _PAGE_SILENT_WRITE;
	489
	490	return pmd;
	491	}
	492
	493	static inline int pmd_dirty(pmd_t pmd)
	494	{
	495	return !!(pmd_val(pmd) & _PAGE_MODIFIED);
	496	}
	497
	498	static inline pmd_t pmd_mkclean(pmd_t pmd)
499	{
500	pmd_val(pmd) &= ~(_PAGE_MODIFIED \| _PAGE_SILENT_WRITE);
501	return pmd;
502	}
503
504	static inline pmd_t pmd_mkdirty(pmd_t pmd)
505	{
506	pmd_val(pmd) \|= _PAGE_MODIFIED;
507	if (pmd_val(pmd) & _PAGE_WRITE)
508	pmd_val(pmd) \|= _PAGE_SILENT_WRITE;
509
510	return pmd;
511	}
512
513	static inline int pmd_young(pmd_t pmd)
514	{
515	return !!(pmd_val(pmd) & _PAGE_ACCESSED);
516	}
517
518	static inline pmd_t pmd_mkold(pmd_t pmd)
519	{
520	pmd_val(pmd) &= ~(_PAGE_ACCESSED\|_PAGE_SILENT_READ);
521
522	return pmd;
523	}
524
525	static inline pmd_t pmd_mkyoung(pmd_t pmd)
526	{
527	pmd_val(pmd) \|= _PAGE_ACCESSED;
528
be0c37c9 SH	529	#ifdef CONFIG_CPU_MIPSR2
	530	if (!(pmd_val(pmd) & _PAGE_NO_READ))
	531	pmd_val(pmd) \|= _PAGE_SILENT_READ;
	532	else
	533	#endif
	534	if (pmd_val(pmd) & _PAGE_READ)
	535	pmd_val(pmd) \|= _PAGE_SILENT_READ;
970d032f RB	536
	537	return pmd;
	538	}
	539
	540	/* Extern to avoid header file madness */
	541	extern pmd_t mk_pmd(struct page *page, pgprot_t prot);
	542
	543	static inline unsigned long pmd_pfn(pmd_t pmd)
	544	{
	545	return pmd_val(pmd) >> _PFN_SHIFT;
	546	}
	547
	548	static inline struct page *pmd_page(pmd_t pmd)
	549	{
	550	if (pmd_trans_huge(pmd))
	551	return pfn_to_page(pmd_pfn(pmd));
	552
	553	return pfn_to_page(pmd_phys(pmd) >> PAGE_SHIFT);
	554	}
	555
	556	static inline pmd_t pmd_modify(pmd_t pmd, pgprot_t newprot)
	557	{
	558	pmd_val(pmd) = (pmd_val(pmd) & _PAGE_CHG_MASK) \| pgprot_val(newprot);
	559	return pmd;
	560	}
	561
	562	static inline pmd_t pmd_mknotpresent(pmd_t pmd)
	563	{
	564	pmd_val(pmd) &= ~(_PAGE_PRESENT \| _PAGE_VALID \| _PAGE_DIRTY);
	565
	566	return pmd;
	567	}
	568
	569	/*
	570	* The generic version pmdp_get_and_clear uses a version of pmd_clear() with a
	571	* different prototype.
	572	*/
	573	#define __HAVE_ARCH_PMDP_GET_AND_CLEAR
	574	static inline pmd_t pmdp_get_and_clear(struct mm_struct *mm,
	575	unsigned long address, pmd_t *pmdp)
	576	{
	577	pmd_t old = *pmdp;
	578
	579	pmd_clear(pmdp);
	580
	581	return old;
	582	}
	583
	584	#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
	585
1da177e4 LT	586	#include <asm-generic/pgtable.h>
1da177e4 LT	587
22f1fdfd WZ	588	/*
	589	* uncached accelerated TLB map for video memory access
	590	*/
	591	#ifdef CONFIG_CPU_SUPPORTS_UNCACHED_ACCELERATED
	592	#define __HAVE_PHYS_MEM_ACCESS_PROT
	593
	594	struct file;
	595	pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
	596	unsigned long size, pgprot_t vma_prot);
	597	int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
	598	unsigned long size, pgprot_t *vma_prot);
	599	#endif
	600
1da177e4 LT	601	/*
	602	* We provide our own get_unmapped area to cope with the virtual aliasing
	603	* constraints placed on us by the cache architecture.
	604	*/
	605	#define HAVE_ARCH_UNMAPPED_AREA
d0be89f6	606	#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
1da177e4 LT	607
	608	/*
	609	* No page table caches to initialise
	610	*/
	611	#define pgtable_cache_init() do { } while (0)
	612
	613	#endif /* _ASM_PGTABLE_H */