[linux-2.6-block.git] / include / asm-x86_64 / pgtable.h

#ifndef _X86_64_PGTABLE_H
#define _X86_64_PGTABLE_H

/*
 * This file contains the functions and defines necessary to modify and use
 * the x86-64 page table tree.
 */
#include <asm/processor.h>
#include <asm/fixmap.h>
#include <asm/bitops.h>
#include <linux/threads.h>
#include <asm/pda.h>

extern pud_t level3_kernel_pgt[512];
extern pud_t level3_physmem_pgt[512];
extern pud_t level3_ident_pgt[512];
extern pmd_t level2_kernel_pgt[512];
extern pgd_t init_level4_pgt[];
extern pgd_t boot_level4_pgt[];
extern unsigned long __supported_pte_mask;

#define swapper_pg_dir init_level4_pgt

extern int nonx_setup(char *str);
extern void paging_init(void);
extern void clear_kernel_mapping(unsigned long addr, unsigned long size);

extern unsigned long pgkern_mask;

/*
 * ZERO_PAGE is a global shared page that is always zero: used
 * for zero-mapped memory areas etc..
 */
extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)];
#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))

/*
 * PGDIR_SHIFT determines what a top-level page table entry can map
 */
#define PGDIR_SHIFT	39
#define PTRS_PER_PGD	512

/*
 * 3rd level page
 */
#define PUD_SHIFT	30
#define PTRS_PER_PUD	512

/*
 * PMD_SHIFT determines the size of the area a middle-level
 * page table can map
 */
#define PMD_SHIFT	21
#define PTRS_PER_PMD	512

/*
 * entries per page directory level
 */
#define PTRS_PER_PTE	512

#define pte_ERROR(e) \
	printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), pte_val(e))
#define pmd_ERROR(e) \
	printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), pmd_val(e))
#define pud_ERROR(e) \
	printk("%s:%d: bad pud %p(%016lx).\n", __FILE__, __LINE__, &(e), pud_val(e))
#define pgd_ERROR(e) \
	printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), pgd_val(e))

#define pgd_none(x)	(!pgd_val(x))
#define pud_none(x)	(!pud_val(x))

static inline void set_pte(pte_t *dst, pte_t val)
{
	pte_val(*dst) = pte_val(val);
} 
#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)

static inline void set_pmd(pmd_t *dst, pmd_t val)
{
        pmd_val(*dst) = pmd_val(val); 
} 

static inline void set_pud(pud_t *dst, pud_t val)
{
	pud_val(*dst) = pud_val(val);
}

static inline void pud_clear (pud_t *pud)
{
	set_pud(pud, __pud(0));
}

static inline void set_pgd(pgd_t *dst, pgd_t val)
{
	pgd_val(*dst) = pgd_val(val); 
} 

static inline void pgd_clear (pgd_t * pgd)
{
	set_pgd(pgd, __pgd(0));
}

#define pud_page(pud) \
((unsigned long) __va(pud_val(pud) & PHYSICAL_PAGE_MASK))

#define ptep_get_and_clear(mm,addr,xp)	__pte(xchg(&(xp)->pte, 0))

struct mm_struct;

static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm, unsigned long addr, pte_t *ptep, int full)
{
	pte_t pte;
	if (full) {
		pte = *ptep;
		*ptep = __pte(0);
	} else {
		pte = ptep_get_and_clear(mm, addr, ptep);
	}
	return pte;
}

#define pte_same(a, b)		((a).pte == (b).pte)

#define pte_pgprot(a)	(__pgprot((a).pte & ~PHYSICAL_PAGE_MASK))

#define PMD_SIZE	(1UL << PMD_SHIFT)
#define PMD_MASK	(~(PMD_SIZE-1))
#define PUD_SIZE	(1UL << PUD_SHIFT)
#define PUD_MASK	(~(PUD_SIZE-1))
#define PGDIR_SIZE	(1UL << PGDIR_SHIFT)
#define PGDIR_MASK	(~(PGDIR_SIZE-1))

#define USER_PTRS_PER_PGD	((TASK_SIZE-1)/PGDIR_SIZE+1)
#define FIRST_USER_ADDRESS	0

#ifndef __ASSEMBLY__
#define MAXMEM		 0x3fffffffffffUL
#define VMALLOC_START    0xffffc20000000000UL
#define VMALLOC_END      0xffffe1ffffffffffUL
#define MODULES_VADDR    0xffffffff88000000UL
#define MODULES_END      0xfffffffffff00000UL
#define MODULES_LEN   (MODULES_END - MODULES_VADDR)

#define _PAGE_BIT_PRESENT	0
#define _PAGE_BIT_RW		1
#define _PAGE_BIT_USER		2
#define _PAGE_BIT_PWT		3
#define _PAGE_BIT_PCD		4
#define _PAGE_BIT_ACCESSED	5
#define _PAGE_BIT_DIRTY		6
#define _PAGE_BIT_PSE		7	/* 4 MB (or 2MB) page */
#define _PAGE_BIT_GLOBAL	8	/* Global TLB entry PPro+ */
#define _PAGE_BIT_NX           63       /* No execute: only valid after cpuid check */

#define _PAGE_PRESENT	0x001
#define _PAGE_RW	0x002
#define _PAGE_USER	0x004
#define _PAGE_PWT	0x008
#define _PAGE_PCD	0x010
#define _PAGE_ACCESSED	0x020
#define _PAGE_DIRTY	0x040
#define _PAGE_PSE	0x080	/* 2MB page */
#define _PAGE_FILE	0x040	/* nonlinear file mapping, saved PTE; unset:swap */
#define _PAGE_GLOBAL	0x100	/* Global TLB entry */

#define _PAGE_PROTNONE	0x080	/* If not present */
#define _PAGE_NX        (1UL<<_PAGE_BIT_NX)

#define _PAGE_TABLE	(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_DIRTY)
#define _KERNPG_TABLE	(_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED | _PAGE_DIRTY)

#define _PAGE_CHG_MASK	(PTE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY)

#define PAGE_NONE	__pgprot(_PAGE_PROTNONE | _PAGE_ACCESSED)
#define PAGE_SHARED	__pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT | _PAGE_RW | _PAGE_USER | _PAGE_ACCESSED)
#define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
#define PAGE_COPY PAGE_COPY_NOEXEC
#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
#define PAGE_READONLY	__pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_NX)
#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
#define __PAGE_KERNEL \
	(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_NX)
#define __PAGE_KERNEL_EXEC \
	(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED)
#define __PAGE_KERNEL_NOCACHE \
	(_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_PCD | _PAGE_ACCESSED | _PAGE_NX)
#define __PAGE_KERNEL_RO \
	(_PAGE_PRESENT | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_NX)
#define __PAGE_KERNEL_VSYSCALL \
	(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED)
#define __PAGE_KERNEL_VSYSCALL_NOCACHE \
	(_PAGE_PRESENT | _PAGE_USER | _PAGE_ACCESSED | _PAGE_PCD)
#define __PAGE_KERNEL_LARGE \
	(__PAGE_KERNEL | _PAGE_PSE)
#define __PAGE_KERNEL_LARGE_EXEC \
	(__PAGE_KERNEL_EXEC | _PAGE_PSE)

#define MAKE_GLOBAL(x) __pgprot((x) | _PAGE_GLOBAL)

#define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
#define PAGE_KERNEL_EXEC MAKE_GLOBAL(__PAGE_KERNEL_EXEC)
#define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
#define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
#define PAGE_KERNEL_VSYSCALL32 __pgprot(__PAGE_KERNEL_VSYSCALL)
#define PAGE_KERNEL_VSYSCALL MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL)
#define PAGE_KERNEL_LARGE MAKE_GLOBAL(__PAGE_KERNEL_LARGE)
#define PAGE_KERNEL_VSYSCALL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL_NOCACHE)

/*         xwr */
#define __P000	PAGE_NONE
#define __P001	PAGE_READONLY
#define __P010	PAGE_COPY
#define __P011	PAGE_COPY
#define __P100	PAGE_READONLY_EXEC
#define __P101	PAGE_READONLY_EXEC
#define __P110	PAGE_COPY_EXEC
#define __P111	PAGE_COPY_EXEC

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

static inline unsigned long pgd_bad(pgd_t pgd) 
{ 
       unsigned long val = pgd_val(pgd);
       val &= ~PTE_MASK; 
       val &= ~(_PAGE_USER | _PAGE_DIRTY); 
       return val & ~(_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED);      
} 

static inline unsigned long pud_bad(pud_t pud)
{
       unsigned long val = pud_val(pud);
       val &= ~PTE_MASK;
       val &= ~(_PAGE_USER | _PAGE_DIRTY);
       return val & ~(_PAGE_PRESENT | _PAGE_RW | _PAGE_ACCESSED);
}

#define pte_none(x)	(!pte_val(x))
#define pte_present(x)	(pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE))
#define pte_clear(mm,addr,xp)	do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)

#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT))	/* FIXME: is this
						   right? */
#define pte_page(x)	pfn_to_page(pte_pfn(x))
#define pte_pfn(x)  ((pte_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)

static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
{
	pte_t pte;
	pte_val(pte) = (page_nr << PAGE_SHIFT);
	pte_val(pte) |= pgprot_val(pgprot);
	pte_val(pte) &= __supported_pte_mask;
	return pte;
}

/*
 * The following only work if pte_present() is true.
 * Undefined behaviour if not..
 */
#define __LARGE_PTE (_PAGE_PSE|_PAGE_PRESENT)
static inline int pte_user(pte_t pte)		{ return pte_val(pte) & _PAGE_USER; }
static inline int pte_read(pte_t pte)		{ return pte_val(pte) & _PAGE_USER; }
static inline int pte_exec(pte_t pte)		{ return pte_val(pte) & _PAGE_USER; }
static inline int pte_dirty(pte_t pte)		{ return pte_val(pte) & _PAGE_DIRTY; }
static inline int pte_young(pte_t pte)		{ return pte_val(pte) & _PAGE_ACCESSED; }
static inline int pte_write(pte_t pte)		{ return pte_val(pte) & _PAGE_RW; }
static inline int pte_file(pte_t pte)		{ return pte_val(pte) & _PAGE_FILE; }
static inline int pte_huge(pte_t pte)		{ return pte_val(pte) & _PAGE_PSE; }

static inline pte_t pte_rdprotect(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
static inline pte_t pte_exprotect(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
static inline pte_t pte_mkclean(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; }
static inline pte_t pte_mkold(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; }
static inline pte_t pte_wrprotect(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_RW)); return pte; }
static inline pte_t pte_mkread(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
static inline pte_t pte_mkexec(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_USER)); return pte; }
static inline pte_t pte_mkdirty(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_DIRTY)); return pte; }
static inline pte_t pte_mkyoung(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_ACCESSED)); return pte; }
static inline pte_t pte_mkwrite(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_RW)); return pte; }
static inline pte_t pte_mkhuge(pte_t pte)	{ set_pte(&pte, __pte(pte_val(pte) | _PAGE_PSE)); return pte; }

struct vm_area_struct;

static inline int ptep_test_and_clear_dirty(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
{
	if (!pte_dirty(*ptep))
		return 0;
	return test_and_clear_bit(_PAGE_BIT_DIRTY, &ptep->pte);
}

static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
{
	if (!pte_young(*ptep))
		return 0;
	return test_and_clear_bit(_PAGE_BIT_ACCESSED, &ptep->pte);
}

static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
{
	clear_bit(_PAGE_BIT_RW, &ptep->pte);
}

/*
 * Macro to mark a page protection value as "uncacheable".
 */
#define pgprot_noncached(prot)	(__pgprot(pgprot_val(prot) | _PAGE_PCD | _PAGE_PWT))

static inline int pmd_large(pmd_t pte) { 
	return (pmd_val(pte) & __LARGE_PTE) == __LARGE_PTE; 
} 	


/*
 * Conversion functions: convert a page and protection to a page entry,
 * and a page entry and page directory to the page they refer to.
 */

/*
 * Level 4 access.
 */
#define pgd_page(pgd) ((unsigned long) __va((unsigned long)pgd_val(pgd) & PTE_MASK))
#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
#define pgd_offset_k(address) (init_level4_pgt + pgd_index(address))
#define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT)
#define mk_kernel_pgd(address) ((pgd_t){ (address) | _KERNPG_TABLE })

/* PUD - Level3 access */
/* to find an entry in a page-table-directory. */
#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
#define pud_offset(pgd, address) ((pud_t *) pgd_page(*(pgd)) + pud_index(address))
#define pud_present(pud) (pud_val(pud) & _PAGE_PRESENT)

/* PMD  - Level 2 access */
#define pmd_page_kernel(pmd) ((unsigned long) __va(pmd_val(pmd) & PTE_MASK))
#define pmd_page(pmd)		(pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))

#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
#define pmd_offset(dir, address) ((pmd_t *) pud_page(*(dir)) + \
			pmd_index(address))
#define pmd_none(x)	(!pmd_val(x))
#define pmd_present(x)	(pmd_val(x) & _PAGE_PRESENT)
#define pmd_clear(xp)	do { set_pmd(xp, __pmd(0)); } while (0)
#define	pmd_bad(x)	((pmd_val(x) & (~PTE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE )
#define pfn_pmd(nr,prot) (__pmd(((nr) << PAGE_SHIFT) | pgprot_val(prot)))
#define pmd_pfn(x)  ((pmd_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)

#define pte_to_pgoff(pte) ((pte_val(pte) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
#define pgoff_to_pte(off) ((pte_t) { ((off) << PAGE_SHIFT) | _PAGE_FILE })
#define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT

/* PTE - Level 1 access. */

/* page, protection -> pte */
#define mk_pte(page, pgprot)	pfn_pte(page_to_pfn(page), (pgprot))
#define mk_pte_huge(entry) (pte_val(entry) |= _PAGE_PRESENT | _PAGE_PSE)
 
/* physical address -> PTE */
static inline pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot)
{ 
	pte_t pte;
	pte_val(pte) = physpage | pgprot_val(pgprot); 
	return pte; 
}
 
/* Change flags of a PTE */
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{ 
	pte_val(pte) &= _PAGE_CHG_MASK;
	pte_val(pte) |= pgprot_val(newprot);
	pte_val(pte) &= __supported_pte_mask;
       return pte; 
}

#define pte_index(address) \
		(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
#define pte_offset_kernel(dir, address) ((pte_t *) pmd_page_kernel(*(dir)) + \
			pte_index(address))

/* x86-64 always has all page tables mapped. */
#define pte_offset_map(dir,address) pte_offset_kernel(dir,address)
#define pte_offset_map_nested(dir,address) pte_offset_kernel(dir,address)
#define pte_unmap(pte) /* NOP */
#define pte_unmap_nested(pte) /* NOP */ 

#define update_mmu_cache(vma,address,pte) do { } while (0)

/* We only update the dirty/accessed state if we set
 * the dirty bit by hand in the kernel, since the hardware
 * will do the accessed bit for us, and we don't want to
 * race with other CPU's that might be updating the dirty
 * bit at the same time. */
#define  __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
	do {								  \
		if (__dirty) {						  \
			set_pte(__ptep, __entry);			  \
			flush_tlb_page(__vma, __address);		  \
		}							  \
	} while (0)

/* Encode and de-code a swap entry */
#define __swp_type(x)			(((x).val >> 1) & 0x3f)
#define __swp_offset(x)			((x).val >> 8)
#define __swp_entry(type, offset)	((swp_entry_t) { ((type) << 1) | ((offset) << 8) })
#define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x)		((pte_t) { (x).val })

extern spinlock_t pgd_lock;
extern struct page *pgd_list;
void vmalloc_sync_all(void);

#endif /* !__ASSEMBLY__ */

extern int kern_addr_valid(unsigned long addr); 

#define io_remap_pfn_range(vma, vaddr, pfn, size, prot)		\
		remap_pfn_range(vma, vaddr, pfn, size, prot)

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

#define HAVE_ARCH_UNMAPPED_AREA

#define pgtable_cache_init()   do { } while (0)
#define check_pgt_cache()      do { } while (0)

#define PAGE_AGP    PAGE_KERNEL_NOCACHE
#define HAVE_PAGE_AGP 1

/* fs/proc/kcore.c */
#define	kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
#define	kc_offset_to_vaddr(o) \
   (((o) & (1UL << (__VIRTUAL_MASK_SHIFT-1))) ? ((o) | (~__VIRTUAL_MASK)) : (o))

#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
#define __HAVE_ARCH_PTEP_SET_WRPROTECT
#define __HAVE_ARCH_PTE_SAME
#include <asm-generic/pgtable.h>

#endif /* _X86_64_PGTABLE_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _X86_64_PGTABLE_H
	2	#define _X86_64_PGTABLE_H
	3
	4	/*
	5	* This file contains the functions and defines necessary to modify and use
	6	* the x86-64 page table tree.
	7	*/
	8	#include <asm/processor.h>
	9	#include <asm/fixmap.h>
	10	#include <asm/bitops.h>
	11	#include <linux/threads.h>
	12	#include <asm/pda.h>
	13
	14	extern pud_t level3_kernel_pgt[512];
	15	extern pud_t level3_physmem_pgt[512];
	16	extern pud_t level3_ident_pgt[512];
	17	extern pmd_t level2_kernel_pgt[512];
	18	extern pgd_t init_level4_pgt[];
f6c2e333	19	extern pgd_t boot_level4_pgt[];
1da177e4 LT	20	extern unsigned long __supported_pte_mask;
	21
	22	#define swapper_pg_dir init_level4_pgt
	23
	24	extern int nonx_setup(char *str);
	25	extern void paging_init(void);
	26	extern void clear_kernel_mapping(unsigned long addr, unsigned long size);
	27
	28	extern unsigned long pgkern_mask;
	29
	30	/*
	31	* ZERO_PAGE is a global shared page that is always zero: used
	32	* for zero-mapped memory areas etc..
	33	*/
	34	extern unsigned long empty_zero_page[PAGE_SIZE/sizeof(unsigned long)];
	35	#define ZERO_PAGE(vaddr) (virt_to_page(empty_zero_page))
	36
	37	/*
	38	* PGDIR_SHIFT determines what a top-level page table entry can map
	39	*/
	40	#define PGDIR_SHIFT 39
	41	#define PTRS_PER_PGD 512
	42
	43	/*
	44	* 3rd level page
	45	*/
	46	#define PUD_SHIFT 30
	47	#define PTRS_PER_PUD 512
	48
	49	/*
	50	* PMD_SHIFT determines the size of the area a middle-level
	51	* page table can map
	52	*/
	53	#define PMD_SHIFT 21
	54	#define PTRS_PER_PMD 512
	55
	56	/*
	57	* entries per page directory level
	58	*/
	59	#define PTRS_PER_PTE 512
	60
	61	#define pte_ERROR(e) \
	62	printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), pte_val(e))
	63	#define pmd_ERROR(e) \
	64	printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), pmd_val(e))
	65	#define pud_ERROR(e) \
	66	printk("%s:%d: bad pud %p(%016lx).\n", __FILE__, __LINE__, &(e), pud_val(e))
	67	#define pgd_ERROR(e) \
	68	printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), pgd_val(e))
	69
	70	#define pgd_none(x) (!pgd_val(x))
	71	#define pud_none(x) (!pud_val(x))
	72
	73	static inline void set_pte(pte_t *dst, pte_t val)
	74	{
	75	pte_val(*dst) = pte_val(val);
	76	}
	77	#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
	78
	79	static inline void set_pmd(pmd_t *dst, pmd_t val)
	80	{
	81	pmd_val(*dst) = pmd_val(val);
	82	}
	83
84	static inline void set_pud(pud_t *dst, pud_t val)
85	{
86	pud_val(*dst) = pud_val(val);
87	}
88
9c0aa0f9	89	static inline void pud_clear (pud_t *pud)
1da177e4 LT	90	{
	91	set_pud(pud, __pud(0));
	92	}
	93
	94	static inline void set_pgd(pgd_t *dst, pgd_t val)
	95	{
	96	pgd_val(*dst) = pgd_val(val);
	97	}
	98
9c0aa0f9	99	static inline void pgd_clear (pgd_t * pgd)
1da177e4 LT	100	{
	101	set_pgd(pgd, __pgd(0));
	102	}
	103
	104	#define pud_page(pud) \
	105	((unsigned long) __va(pud_val(pud) & PHYSICAL_PAGE_MASK))
	106
	107	#define ptep_get_and_clear(mm,addr,xp) __pte(xchg(&(xp)->pte, 0))
61e06037	108
8c65b4a6 TS	109	struct mm_struct;
8c65b4a6 TS	110
61e06037 ZA	111	static inline pte_t ptep_get_and_clear_full(struct mm_struct mm, unsigned long addr, pte_t ptep, int full)
	112	{
	113	pte_t pte;
	114	if (full) {
	115	pte = *ptep;
	116	*ptep = __pte(0);
	117	} else {
	118	pte = ptep_get_and_clear(mm, addr, ptep);
	119	}
	120	return pte;
	121	}
	122
1da177e4 LT	123	#define pte_same(a, b) ((a).pte == (b).pte)
1da177e4 LT	124
c728252c AV	125	#define pte_pgprot(a) (__pgprot((a).pte & ~PHYSICAL_PAGE_MASK))
c728252c AV	126
1da177e4 LT	127	#define PMD_SIZE (1UL << PMD_SHIFT)
	128	#define PMD_MASK (~(PMD_SIZE-1))
	129	#define PUD_SIZE (1UL << PUD_SHIFT)
	130	#define PUD_MASK (~(PUD_SIZE-1))
	131	#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
	132	#define PGDIR_MASK (~(PGDIR_SIZE-1))
	133
f83f2b5f	134	#define USER_PTRS_PER_PGD ((TASK_SIZE-1)/PGDIR_SIZE+1)
d455a369	135	#define FIRST_USER_ADDRESS 0
1da177e4 LT	136
	137	#ifndef __ASSEMBLY__
	138	#define MAXMEM 0x3fffffffffffUL
	139	#define VMALLOC_START 0xffffc20000000000UL
	140	#define VMALLOC_END 0xffffe1ffffffffffUL
	141	#define MODULES_VADDR 0xffffffff88000000UL
	142	#define MODULES_END 0xfffffffffff00000UL
	143	#define MODULES_LEN (MODULES_END - MODULES_VADDR)
	144
	145	#define _PAGE_BIT_PRESENT 0
	146	#define _PAGE_BIT_RW 1
	147	#define _PAGE_BIT_USER 2
	148	#define _PAGE_BIT_PWT 3
	149	#define _PAGE_BIT_PCD 4
	150	#define _PAGE_BIT_ACCESSED 5
	151	#define _PAGE_BIT_DIRTY 6
	152	#define _PAGE_BIT_PSE 7 /* 4 MB (or 2MB) page */
	153	#define _PAGE_BIT_GLOBAL 8 /* Global TLB entry PPro+ */
	154	#define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */
	155
	156	#define _PAGE_PRESENT 0x001
	157	#define _PAGE_RW 0x002
	158	#define _PAGE_USER 0x004
	159	#define _PAGE_PWT 0x008
	160	#define _PAGE_PCD 0x010
	161	#define _PAGE_ACCESSED 0x020
	162	#define _PAGE_DIRTY 0x040
	163	#define _PAGE_PSE 0x080 /* 2MB page */
9b4ee40e	164	#define _PAGE_FILE 0x040 /* nonlinear file mapping, saved PTE; unset:swap */
1da177e4 LT	165	#define _PAGE_GLOBAL 0x100 /* Global TLB entry */
	166
	167	#define _PAGE_PROTNONE 0x080 /* If not present */
	168	#define _PAGE_NX (1UL<<_PAGE_BIT_NX)
	169
	170	#define _PAGE_TABLE (_PAGE_PRESENT \| _PAGE_RW \| _PAGE_USER \| _PAGE_ACCESSED \| _PAGE_DIRTY)
	171	#define _KERNPG_TABLE (_PAGE_PRESENT \| _PAGE_RW \| _PAGE_ACCESSED \| _PAGE_DIRTY)
	172
	173	#define _PAGE_CHG_MASK (PTE_MASK \| _PAGE_ACCESSED \| _PAGE_DIRTY)
	174
	175	#define PAGE_NONE __pgprot(_PAGE_PROTNONE \| _PAGE_ACCESSED)
	176	#define PAGE_SHARED __pgprot(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_USER \| _PAGE_ACCESSED \| _PAGE_NX)
	177	#define PAGE_SHARED_EXEC __pgprot(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_USER \| _PAGE_ACCESSED)
	178	#define PAGE_COPY_NOEXEC __pgprot(_PAGE_PRESENT \| _PAGE_USER \| _PAGE_ACCESSED \| _PAGE_NX)
	179	#define PAGE_COPY PAGE_COPY_NOEXEC
	180	#define PAGE_COPY_EXEC __pgprot(_PAGE_PRESENT \| _PAGE_USER \| _PAGE_ACCESSED)
	181	#define PAGE_READONLY __pgprot(_PAGE_PRESENT \| _PAGE_USER \| _PAGE_ACCESSED \| _PAGE_NX)
	182	#define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT \| _PAGE_USER \| _PAGE_ACCESSED)
	183	#define __PAGE_KERNEL \
	184	(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_DIRTY \| _PAGE_ACCESSED \| _PAGE_NX)
	185	#define __PAGE_KERNEL_EXEC \
	186	(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_DIRTY \| _PAGE_ACCESSED)
	187	#define __PAGE_KERNEL_NOCACHE \
	188	(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_DIRTY \| _PAGE_PCD \| _PAGE_ACCESSED \| _PAGE_NX)
	189	#define __PAGE_KERNEL_RO \
	190	(_PAGE_PRESENT \| _PAGE_DIRTY \| _PAGE_ACCESSED \| _PAGE_NX)
	191	#define __PAGE_KERNEL_VSYSCALL \
	192	(_PAGE_PRESENT \| _PAGE_USER \| _PAGE_ACCESSED)
	193	#define __PAGE_KERNEL_VSYSCALL_NOCACHE \
	194	(_PAGE_PRESENT \| _PAGE_USER \| _PAGE_ACCESSED \| _PAGE_PCD)
	195	#define __PAGE_KERNEL_LARGE \
	196	(__PAGE_KERNEL \| _PAGE_PSE)
8bf27556 EB	197	#define __PAGE_KERNEL_LARGE_EXEC \
8bf27556 EB	198	(__PAGE_KERNEL_EXEC \| _PAGE_PSE)
1da177e4 LT	199
	200	#define MAKE_GLOBAL(x) __pgprot((x) \| _PAGE_GLOBAL)
	201
	202	#define PAGE_KERNEL MAKE_GLOBAL(__PAGE_KERNEL)
	203	#define PAGE_KERNEL_EXEC MAKE_GLOBAL(__PAGE_KERNEL_EXEC)
	204	#define PAGE_KERNEL_RO MAKE_GLOBAL(__PAGE_KERNEL_RO)
	205	#define PAGE_KERNEL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_NOCACHE)
	206	#define PAGE_KERNEL_VSYSCALL32 __pgprot(__PAGE_KERNEL_VSYSCALL)
	207	#define PAGE_KERNEL_VSYSCALL MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL)
	208	#define PAGE_KERNEL_LARGE MAKE_GLOBAL(__PAGE_KERNEL_LARGE)
	209	#define PAGE_KERNEL_VSYSCALL_NOCACHE MAKE_GLOBAL(__PAGE_KERNEL_VSYSCALL_NOCACHE)
	210
	211	/* xwr */
	212	#define __P000 PAGE_NONE
	213	#define __P001 PAGE_READONLY
	214	#define __P010 PAGE_COPY
	215	#define __P011 PAGE_COPY
	216	#define __P100 PAGE_READONLY_EXEC
	217	#define __P101 PAGE_READONLY_EXEC
	218	#define __P110 PAGE_COPY_EXEC
	219	#define __P111 PAGE_COPY_EXEC
	220
	221	#define __S000 PAGE_NONE
	222	#define __S001 PAGE_READONLY
	223	#define __S010 PAGE_SHARED
	224	#define __S011 PAGE_SHARED
	225	#define __S100 PAGE_READONLY_EXEC
	226	#define __S101 PAGE_READONLY_EXEC
	227	#define __S110 PAGE_SHARED_EXEC
	228	#define __S111 PAGE_SHARED_EXEC
	229
	230	static inline unsigned long pgd_bad(pgd_t pgd)
	231	{
	232	unsigned long val = pgd_val(pgd);
	233	val &= ~PTE_MASK;
	234	val &= ~(_PAGE_USER \| _PAGE_DIRTY);
	235	return val & ~(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_ACCESSED);
	236	}
	237
	238	static inline unsigned long pud_bad(pud_t pud)
	239	{
	240	unsigned long val = pud_val(pud);
	241	val &= ~PTE_MASK;
	242	val &= ~(_PAGE_USER \| _PAGE_DIRTY);
	243	return val & ~(_PAGE_PRESENT \| _PAGE_RW \| _PAGE_ACCESSED);
	244	}
	245
	246	#define pte_none(x) (!pte_val(x))
	247	#define pte_present(x) (pte_val(x) & (_PAGE_PRESENT \| _PAGE_PROTNONE))
	248	#define pte_clear(mm,addr,xp) do { set_pte_at(mm, addr, xp, __pte(0)); } while (0)
	249
	250	#define pages_to_mb(x) ((x) >> (20-PAGE_SHIFT)) /* FIXME: is this
	251	right? */
	252	#define pte_page(x) pfn_to_page(pte_pfn(x))
6b75aeed	253	#define pte_pfn(x) ((pte_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)
1da177e4 LT	254
	255	static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
	256	{
	257	pte_t pte;
	258	pte_val(pte) = (page_nr << PAGE_SHIFT);
	259	pte_val(pte) \|= pgprot_val(pgprot);
	260	pte_val(pte) &= __supported_pte_mask;
	261	return pte;
	262	}
	263
	264	/*
	265	* The following only work if pte_present() is true.
	266	* Undefined behaviour if not..
	267	*/
32e51a8c	268	#define __LARGE_PTE (_PAGE_PSE\|_PAGE_PRESENT)
1da177e4	269	static inline int pte_user(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
4839057c AB	270	static inline int pte_read(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
	271	static inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_USER; }
	272	static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
	273	static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
	274	static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_RW; }
1da177e4	275	static inline int pte_file(pte_t pte) { return pte_val(pte) & _PAGE_FILE; }
8f860591	276	static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_PSE; }
1da177e4	277
4839057c AB	278	static inline pte_t pte_rdprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
	279	static inline pte_t pte_exprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_USER)); return pte; }
	280	static inline pte_t pte_mkclean(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_DIRTY)); return pte; }
	281	static inline pte_t pte_mkold(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_ACCESSED)); return pte; }
	282	static inline pte_t pte_wrprotect(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) & ~_PAGE_RW)); return pte; }
	283	static inline pte_t pte_mkread(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) \| _PAGE_USER)); return pte; }
	284	static inline pte_t pte_mkexec(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) \| _PAGE_USER)); return pte; }
	285	static inline pte_t pte_mkdirty(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) \| _PAGE_DIRTY)); return pte; }
	286	static inline pte_t pte_mkyoung(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) \| _PAGE_ACCESSED)); return pte; }
	287	static inline pte_t pte_mkwrite(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) \| _PAGE_RW)); return pte; }
8f860591	288	static inline pte_t pte_mkhuge(pte_t pte) { set_pte(&pte, __pte(pte_val(pte) \| _PAGE_PSE)); return pte; }
1da177e4 LT	289
	290	struct vm_area_struct;
	291
	292	static inline int ptep_test_and_clear_dirty(struct vm_area_struct vma, unsigned long addr, pte_t ptep)
	293	{
	294	if (!pte_dirty(*ptep))
	295	return 0;
3d1712c9	296	return test_and_clear_bit(_PAGE_BIT_DIRTY, &ptep->pte);
1da177e4 LT	297	}
	298
	299	static inline int ptep_test_and_clear_young(struct vm_area_struct vma, unsigned long addr, pte_t ptep)
	300	{
	301	if (!pte_young(*ptep))
	302	return 0;
3d1712c9	303	return test_and_clear_bit(_PAGE_BIT_ACCESSED, &ptep->pte);
1da177e4 LT	304	}
	305
	306	static inline void ptep_set_wrprotect(struct mm_struct mm, unsigned long addr, pte_t ptep)
	307	{
3d1712c9	308	clear_bit(_PAGE_BIT_RW, &ptep->pte);
1da177e4 LT	309	}
	310
	311	/*
	312	* Macro to mark a page protection value as "uncacheable".
	313	*/
	314	#define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) \| _PAGE_PCD \| _PAGE_PWT))
	315
1da177e4 LT	316	static inline int pmd_large(pmd_t pte) {
	317	return (pmd_val(pte) & __LARGE_PTE) == __LARGE_PTE;
	318	}
	319
	320
	321	/*
	322	* Conversion functions: convert a page and protection to a page entry,
	323	* and a page entry and page directory to the page they refer to.
	324	*/
	325
1da177e4 LT	326	/*
	327	* Level 4 access.
	328	*/
	329	#define pgd_page(pgd) ((unsigned long) __va((unsigned long)pgd_val(pgd) & PTE_MASK))
	330	#define pgd_index(address) (((address) >> PGDIR_SHIFT) & (PTRS_PER_PGD-1))
	331	#define pgd_offset(mm, addr) ((mm)->pgd + pgd_index(addr))
	332	#define pgd_offset_k(address) (init_level4_pgt + pgd_index(address))
	333	#define pgd_present(pgd) (pgd_val(pgd) & _PAGE_PRESENT)
	334	#define mk_kernel_pgd(address) ((pgd_t){ (address) \| _KERNPG_TABLE })
	335
	336	/* PUD - Level3 access */
	337	/* to find an entry in a page-table-directory. */
	338	#define pud_index(address) (((address) >> PUD_SHIFT) & (PTRS_PER_PUD-1))
	339	#define pud_offset(pgd, address) ((pud_t ) pgd_page((pgd)) + pud_index(address))
1da177e4 LT	340	#define pud_present(pud) (pud_val(pud) & _PAGE_PRESENT)
1da177e4 LT	341
1da177e4 LT	342	/* PMD - Level 2 access */
	343	#define pmd_page_kernel(pmd) ((unsigned long) __va(pmd_val(pmd) & PTE_MASK))
	344	#define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT))
	345
	346	#define pmd_index(address) (((address) >> PMD_SHIFT) & (PTRS_PER_PMD-1))
	347	#define pmd_offset(dir, address) ((pmd_t ) pud_page((dir)) + \
	348	pmd_index(address))
	349	#define pmd_none(x) (!pmd_val(x))
	350	#define pmd_present(x) (pmd_val(x) & _PAGE_PRESENT)
	351	#define pmd_clear(xp) do { set_pmd(xp, __pmd(0)); } while (0)
	352	#define pmd_bad(x) ((pmd_val(x) & (~PTE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE )
	353	#define pfn_pmd(nr,prot) (__pmd(((nr) << PAGE_SHIFT) \| pgprot_val(prot)))
6b75aeed	354	#define pmd_pfn(x) ((pmd_val(x) & __PHYSICAL_MASK) >> PAGE_SHIFT)
1da177e4 LT	355
	356	#define pte_to_pgoff(pte) ((pte_val(pte) & PHYSICAL_PAGE_MASK) >> PAGE_SHIFT)
	357	#define pgoff_to_pte(off) ((pte_t) { ((off) << PAGE_SHIFT) \| _PAGE_FILE })
	358	#define PTE_FILE_MAX_BITS __PHYSICAL_MASK_SHIFT
	359
	360	/* PTE - Level 1 access. */
	361
	362	/* page, protection -> pte */
	363	#define mk_pte(page, pgprot) pfn_pte(page_to_pfn(page), (pgprot))
	364	#define mk_pte_huge(entry) (pte_val(entry) \|= _PAGE_PRESENT \| _PAGE_PSE)
	365
	366	/* physical address -> PTE */
	367	static inline pte_t mk_pte_phys(unsigned long physpage, pgprot_t pgprot)
	368	{
	369	pte_t pte;
	370	pte_val(pte) = physpage \| pgprot_val(pgprot);
	371	return pte;
	372	}
	373
	374	/* Change flags of a PTE */
9c0aa0f9	375	static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
1da177e4 LT	376	{
	377	pte_val(pte) &= _PAGE_CHG_MASK;
	378	pte_val(pte) \|= pgprot_val(newprot);
	379	pte_val(pte) &= __supported_pte_mask;
	380	return pte;
	381	}
	382
	383	#define pte_index(address) \
1294b118	384	(((address) >> PAGE_SHIFT) & (PTRS_PER_PTE - 1))
1da177e4 LT	385	#define pte_offset_kernel(dir, address) ((pte_t ) pmd_page_kernel((dir)) + \
	386	pte_index(address))
	387
	388	/* x86-64 always has all page tables mapped. */
	389	#define pte_offset_map(dir,address) pte_offset_kernel(dir,address)
	390	#define pte_offset_map_nested(dir,address) pte_offset_kernel(dir,address)
	391	#define pte_unmap(pte) /* NOP */
	392	#define pte_unmap_nested(pte) /* NOP */
	393
	394	#define update_mmu_cache(vma,address,pte) do { } while (0)
	395
	396	/* We only update the dirty/accessed state if we set
	397	* the dirty bit by hand in the kernel, since the hardware
	398	* will do the accessed bit for us, and we don't want to
	399	* race with other CPU's that might be updating the dirty
	400	* bit at the same time. */
	401	#define __HAVE_ARCH_PTEP_SET_ACCESS_FLAGS
	402	#define ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
	403	do { \
	404	if (__dirty) { \
	405	set_pte(__ptep, __entry); \
	406	flush_tlb_page(__vma, __address); \
	407	} \
	408	} while (0)
	409
	410	/* Encode and de-code a swap entry */
	411	#define __swp_type(x) (((x).val >> 1) & 0x3f)
	412	#define __swp_offset(x) ((x).val >> 8)
	413	#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 1) \| ((offset) << 8) })
	414	#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) })
	415	#define __swp_entry_to_pte(x) ((pte_t) { (x).val })
	416
8c914cb7 JB	417	extern spinlock_t pgd_lock;
	418	extern struct page *pgd_list;
	419	void vmalloc_sync_all(void);
	420
1da177e4 LT	421	#endif /* !__ASSEMBLY__ */
	422
	423	extern int kern_addr_valid(unsigned long addr);
	424
1da177e4 LT	425	#define io_remap_pfn_range(vma, vaddr, pfn, size, prot) \
	426	remap_pfn_range(vma, vaddr, pfn, size, prot)
	427
	428	#define MK_IOSPACE_PFN(space, pfn) (pfn)
	429	#define GET_IOSPACE(pfn) 0
	430	#define GET_PFN(pfn) (pfn)
	431
	432	#define HAVE_ARCH_UNMAPPED_AREA
	433
	434	#define pgtable_cache_init() do { } while (0)
	435	#define check_pgt_cache() do { } while (0)
	436
	437	#define PAGE_AGP PAGE_KERNEL_NOCACHE
	438	#define HAVE_PAGE_AGP 1
	439
	440	/* fs/proc/kcore.c */
	441	#define kc_vaddr_to_offset(v) ((v) & __VIRTUAL_MASK)
	442	#define kc_offset_to_vaddr(o) \
	443	(((o) & (1UL << (__VIRTUAL_MASK_SHIFT-1))) ? ((o) \| (~__VIRTUAL_MASK)) : (o))
	444
	445	#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_YOUNG
	446	#define __HAVE_ARCH_PTEP_TEST_AND_CLEAR_DIRTY
	447	#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
61e06037	448	#define __HAVE_ARCH_PTEP_GET_AND_CLEAR_FULL
1da177e4 LT	449	#define __HAVE_ARCH_PTEP_SET_WRPROTECT
	450	#define __HAVE_ARCH_PTE_SAME
	451	#include <asm-generic/pgtable.h>
	452
	453	#endif /* _X86_64_PGTABLE_H */