bb8985586b
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
80 lines
2.0 KiB
C
80 lines
2.0 KiB
C
#ifndef ASM_X86__PGTABLE_2LEVEL_H
|
|
#define ASM_X86__PGTABLE_2LEVEL_H
|
|
|
|
#define pte_ERROR(e) \
|
|
printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, (e).pte_low)
|
|
#define pgd_ERROR(e) \
|
|
printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
|
|
|
|
/*
|
|
* Certain architectures need to do special things when PTEs
|
|
* within a page table are directly modified. Thus, the following
|
|
* hook is made available.
|
|
*/
|
|
static inline void native_set_pte(pte_t *ptep , pte_t pte)
|
|
{
|
|
*ptep = pte;
|
|
}
|
|
|
|
static inline void native_set_pmd(pmd_t *pmdp, pmd_t pmd)
|
|
{
|
|
*pmdp = pmd;
|
|
}
|
|
|
|
static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
|
|
{
|
|
native_set_pte(ptep, pte);
|
|
}
|
|
|
|
static inline void native_set_pte_present(struct mm_struct *mm,
|
|
unsigned long addr,
|
|
pte_t *ptep, pte_t pte)
|
|
{
|
|
native_set_pte(ptep, pte);
|
|
}
|
|
|
|
static inline void native_pmd_clear(pmd_t *pmdp)
|
|
{
|
|
native_set_pmd(pmdp, __pmd(0));
|
|
}
|
|
|
|
static inline void native_pte_clear(struct mm_struct *mm,
|
|
unsigned long addr, pte_t *xp)
|
|
{
|
|
*xp = native_make_pte(0);
|
|
}
|
|
|
|
#ifdef CONFIG_SMP
|
|
static inline pte_t native_ptep_get_and_clear(pte_t *xp)
|
|
{
|
|
return __pte(xchg(&xp->pte_low, 0));
|
|
}
|
|
#else
|
|
#define native_ptep_get_and_clear(xp) native_local_ptep_get_and_clear(xp)
|
|
#endif
|
|
|
|
#define pte_none(x) (!(x).pte_low)
|
|
|
|
/*
|
|
* Bits 0, 6 and 7 are taken, split up the 29 bits of offset
|
|
* into this range:
|
|
*/
|
|
#define PTE_FILE_MAX_BITS 29
|
|
|
|
#define pte_to_pgoff(pte) \
|
|
((((pte).pte_low >> 1) & 0x1f) + (((pte).pte_low >> 8) << 5))
|
|
|
|
#define pgoff_to_pte(off) \
|
|
((pte_t) { .pte_low = (((off) & 0x1f) << 1) + \
|
|
(((off) >> 5) << 8) + _PAGE_FILE })
|
|
|
|
/* Encode and de-code a swap entry */
|
|
#define __swp_type(x) (((x).val >> 1) & 0x1f)
|
|
#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).pte_low })
|
|
#define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val })
|
|
|
|
#endif /* ASM_X86__PGTABLE_2LEVEL_H */
|