pgtable.h

来自「Linux Kernel 2.6.9 for OMAP1710」· C头文件 代码 · 共 523 行 · 第 1/2 页

#define pte_present(x)	(pte_val(x) & _PAGE_PRESENT)
#define pte_clear(xp)	do { pte_val(*(xp)) = 0; } while (0)

#define pmd_flag(x)	(pmd_val(x) & PxD_FLAG_MASK)
#define pmd_address(x)	((unsigned long)(pmd_val(x) &~ PxD_FLAG_MASK) << PxD_VALUE_SHIFT)
#define pgd_flag(x)	(pgd_val(x) & PxD_FLAG_MASK)
#define pgd_address(x)	((unsigned long)(pgd_val(x) &~ PxD_FLAG_MASK) << PxD_VALUE_SHIFT)

#ifdef CONFIG_64BIT
/* The first entry of the permanent pmd is not there if it contains
 * the gateway marker */
#define pmd_none(x)	(!pmd_val(x) || pmd_flag(x) == PxD_FLAG_ATTACHED)
#else
#define pmd_none(x)	(!pmd_val(x))
#endif
#define pmd_bad(x)	(!(pmd_flag(x) & PxD_FLAG_VALID))
#define pmd_present(x)	(pmd_flag(x) & PxD_FLAG_PRESENT)
static inline void pmd_clear(pmd_t *pmd) {
#ifdef CONFIG_64BIT
	if (pmd_flag(*pmd) & PxD_FLAG_ATTACHED)
		/* This is the entry pointing to the permanent pmd
		 * attached to the pgd; cannot clear it */
		__pmd_val_set(*pmd, PxD_FLAG_ATTACHED);
	else
#endif
		__pmd_val_set(*pmd,  0);
}



#if PT_NLEVELS == 3
#define pgd_page(pgd) ((unsigned long) __va(pgd_address(pgd)))

/* For 64 bit we have three level tables */

#define pgd_none(x)     (!pgd_val(x))
#define pgd_bad(x)      (!(pgd_flag(x) & PxD_FLAG_VALID))
#define pgd_present(x)  (pgd_flag(x) & PxD_FLAG_PRESENT)
static inline void pgd_clear(pgd_t *pgd) {
#ifdef CONFIG_64BIT
	if(pgd_flag(*pgd) & PxD_FLAG_ATTACHED)
		/* This is the permanent pmd attached to the pgd; cannot
		 * free it */
		return;
#endif
	__pgd_val_set(*pgd, 0);
}
#else
/*
 * The "pgd_xxx()" functions here are trivial for a folded two-level
 * setup: the pgd is never bad, and a pmd always exists (as it's folded
 * into the pgd entry)
 */
extern inline int pgd_none(pgd_t pgd)		{ return 0; }
extern inline int pgd_bad(pgd_t pgd)		{ return 0; }
extern inline int pgd_present(pgd_t pgd)	{ return 1; }
extern inline void pgd_clear(pgd_t * pgdp)	{ }
#endif

/*
 * The following only work if pte_present() is true.
 * Undefined behaviour if not..
 */
extern inline int pte_read(pte_t pte)		{ return pte_val(pte) & _PAGE_READ; }
extern inline int pte_dirty(pte_t pte)		{ return pte_val(pte) & _PAGE_DIRTY; }
extern inline int pte_young(pte_t pte)		{ return pte_val(pte) & _PAGE_ACCESSED; }
extern inline int pte_write(pte_t pte)		{ return pte_val(pte) & _PAGE_WRITE; }
extern inline int pte_file(pte_t pte)		{ return pte_val(pte) & _PAGE_FILE; }
extern inline int pte_user(pte_t pte) 		{ return pte_val(pte) & _PAGE_USER; }

extern inline pte_t pte_rdprotect(pte_t pte)	{ pte_val(pte) &= ~_PAGE_READ; return pte; }
extern inline pte_t pte_mkclean(pte_t pte)	{ pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
extern inline pte_t pte_mkold(pte_t pte)	{ pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
extern inline pte_t pte_wrprotect(pte_t pte)	{ pte_val(pte) &= ~_PAGE_WRITE; return pte; }
extern inline pte_t pte_mkread(pte_t pte)	{ pte_val(pte) |= _PAGE_READ; return pte; }
extern inline pte_t pte_mkdirty(pte_t pte)	{ pte_val(pte) |= _PAGE_DIRTY; return pte; }
extern inline pte_t pte_mkyoung(pte_t pte)	{ pte_val(pte) |= _PAGE_ACCESSED; return pte; }
extern inline pte_t pte_mkwrite(pte_t pte)	{ pte_val(pte) |= _PAGE_WRITE; return 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.
 */
#define __mk_pte(addr,pgprot) \
({									\
	pte_t __pte;							\
									\
	pte_val(__pte) = ((addr)+pgprot_val(pgprot));			\
									\
	__pte;								\
})

#define mk_pte(page, pgprot)	pfn_pte(page_to_pfn(page), (pgprot))

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

/* This takes a physical page address that is used by the remapping functions */
#define mk_pte_phys(physpage, pgprot) \
({ pte_t __pte; pte_val(__pte) = physpage + pgprot_val(pgprot); __pte; })

extern inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{ pte_val(pte) = (pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot); return pte; }

/* Permanent address of a page.  On parisc we don't have highmem. */

#define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT)

#define pte_page(pte)		(pfn_to_page(pte_pfn(pte)))

#define pmd_page_kernel(pmd)	((unsigned long) __va(pmd_address(pmd)))

#define __pmd_page(pmd) ((unsigned long) __va(pmd_address(pmd)))
#define pmd_page(pmd)	virt_to_page((void *)__pmd_page(pmd))

#define pgd_index(address) ((address) >> PGDIR_SHIFT)

/* to find an entry in a page-table-directory */
#define pgd_offset(mm, address) \
((mm)->pgd + ((address) >> PGDIR_SHIFT))

/* to find an entry in a kernel page-table-directory */
#define pgd_offset_k(address) pgd_offset(&init_mm, address)

/* Find an entry in the second-level page table.. */

#if PT_NLEVELS == 3
#define pmd_offset(dir,address) \
((pmd_t *) pgd_page(*(dir)) + (((address)>>PMD_SHIFT) & (PTRS_PER_PMD-1)))
#else
#define pmd_offset(dir,addr) ((pmd_t *) dir)
#endif

/* Find an entry in the third-level page table.. */ 
#define pte_index(address) (((address) >> PAGE_SHIFT) & (PTRS_PER_PTE-1))
#define pte_offset_kernel(pmd, address) \
	((pte_t *) pmd_page_kernel(*(pmd)) + pte_index(address))
#define pte_offset_map(pmd, address) pte_offset_kernel(pmd, address)
#define pte_offset_map_nested(pmd, address) pte_offset_kernel(pmd, address)
#define pte_unmap(pte) do { } while (0)
#define pte_unmap_nested(pte) do { } while (0)

#define pte_unmap(pte)			do { } while (0)
#define pte_unmap_nested(pte)		do { } while (0)

extern void paging_init (void);

/* Used for deferring calls to flush_dcache_page() */

#define PG_dcache_dirty         PG_arch_1

struct vm_area_struct; /* forward declaration (include/linux/mm.h) */
extern void update_mmu_cache(struct vm_area_struct *, unsigned long, pte_t);

/* Encode and de-code a swap entry */

#define __swp_type(x)                     ((x).val & 0x1f)
#define __swp_offset(x)                   ( (((x).val >> 6) &  0x7) | \
					  (((x).val >> 8) & ~0x7) )
#define __swp_entry(type, offset)         ((swp_entry_t) { (type) | \
					    ((offset &  0x7) << 6) | \
					    ((offset & ~0x7) << 8) })
#define __pte_to_swp_entry(pte)		((swp_entry_t) { pte_val(pte) })
#define __swp_entry_to_pte(x)		((pte_t) { (x).val })

static inline int ptep_test_and_clear_young(pte_t *ptep)
{
#ifdef CONFIG_SMP
	if (!pte_young(*ptep))
		return 0;
	return test_and_clear_bit(xlate_pabit(_PAGE_ACCESSED_BIT), &pte_val(*ptep));
#else
	pte_t pte = *ptep;
	if (!pte_young(pte))
		return 0;
	set_pte(ptep, pte_mkold(pte));
	return 1;
#endif
}

static inline int ptep_test_and_clear_dirty(pte_t *ptep)
{
#ifdef CONFIG_SMP
	if (!pte_dirty(*ptep))
		return 0;
	return test_and_clear_bit(xlate_pabit(_PAGE_DIRTY_BIT), &pte_val(*ptep));
#else
	pte_t pte = *ptep;
	if (!pte_dirty(pte))
		return 0;
	set_pte(ptep, pte_mkclean(pte));
	return 1;
#endif
}

extern spinlock_t pa_dbit_lock;

static inline pte_t ptep_get_and_clear(pte_t *ptep)
{
	pte_t old_pte;
	pte_t pte;

	spin_lock(&pa_dbit_lock);
	pte = old_pte = *ptep;
	pte_val(pte) &= ~_PAGE_PRESENT;
	pte_val(pte) |= _PAGE_FLUSH;
	set_pte(ptep,pte);
	spin_unlock(&pa_dbit_lock);

	return old_pte;
}

static inline void ptep_set_wrprotect(pte_t *ptep)
{
#ifdef CONFIG_SMP
	unsigned long new, old;

	do {
		old = pte_val(*ptep);
		new = pte_val(pte_wrprotect(__pte (old)));
	} while (cmpxchg((unsigned long *) ptep, old, new) != old);
#else
	pte_t old_pte = *ptep;
	set_pte(ptep, pte_wrprotect(old_pte));
#endif
}

static inline void ptep_mkdirty(pte_t *ptep)
{
#ifdef CONFIG_SMP
	set_bit(xlate_pabit(_PAGE_DIRTY_BIT), &pte_val(*ptep));
#else
	pte_t old_pte = *ptep;
	set_pte(ptep, pte_mkdirty(old_pte));
#endif
}

#define pte_same(A,B)	(pte_val(A) == pte_val(B))

#endif /* !__ASSEMBLY__ */

#define io_remap_page_range remap_page_range

/* We provide our own get_unmapped_area to provide cache coherency */

#define HAVE_ARCH_UNMAPPED_AREA

#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_SET_WRPROTECT
#define __HAVE_ARCH_PTEP_MKDIRTY
#define __HAVE_ARCH_PTE_SAME
#include <asm-generic/pgtable.h>

#endif /* _PARISC_PGTABLE_H */