0,0 → 1,116 |
#ifndef _ASM_X86_PGTABLE_2LEVEL_H |
#define _ASM_X86_PGTABLE_2LEVEL_H |
|
#define pte_ERROR(e) \ |
pr_err("%s:%d: bad pte %08lx\n", __FILE__, __LINE__, (e).pte_low) |
#define pgd_ERROR(e) \ |
pr_err("%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_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 |
|
#ifdef CONFIG_SMP |
static inline pmd_t native_pmdp_get_and_clear(pmd_t *xp) |
{ |
return __pmd(xchg((pmdval_t *)xp, 0)); |
} |
#else |
#define native_pmdp_get_and_clear(xp) native_local_pmdp_get_and_clear(xp) |
#endif |
|
/* Bit manipulation helper on pte/pgoff entry */ |
static inline unsigned long pte_bitop(unsigned long value, unsigned int rightshift, |
unsigned long mask, unsigned int leftshift) |
{ |
return ((value >> rightshift) & mask) << leftshift; |
} |
|
/* |
* Bits _PAGE_BIT_PRESENT, _PAGE_BIT_FILE and _PAGE_BIT_PROTNONE are taken, |
* split up the 29 bits of offset into this range. |
*/ |
#define PTE_FILE_MAX_BITS 29 |
#define PTE_FILE_SHIFT1 (_PAGE_BIT_PRESENT + 1) |
#define PTE_FILE_SHIFT2 (_PAGE_BIT_FILE + 1) |
#define PTE_FILE_SHIFT3 (_PAGE_BIT_PROTNONE + 1) |
#define PTE_FILE_BITS1 (PTE_FILE_SHIFT2 - PTE_FILE_SHIFT1 - 1) |
#define PTE_FILE_BITS2 (PTE_FILE_SHIFT3 - PTE_FILE_SHIFT2 - 1) |
|
#define PTE_FILE_MASK1 ((1U << PTE_FILE_BITS1) - 1) |
#define PTE_FILE_MASK2 ((1U << PTE_FILE_BITS2) - 1) |
|
#define PTE_FILE_LSHIFT2 (PTE_FILE_BITS1) |
#define PTE_FILE_LSHIFT3 (PTE_FILE_BITS1 + PTE_FILE_BITS2) |
|
static __always_inline pgoff_t pte_to_pgoff(pte_t pte) |
{ |
return (pgoff_t) |
(pte_bitop(pte.pte_low, PTE_FILE_SHIFT1, PTE_FILE_MASK1, 0) + |
pte_bitop(pte.pte_low, PTE_FILE_SHIFT2, PTE_FILE_MASK2, PTE_FILE_LSHIFT2) + |
pte_bitop(pte.pte_low, PTE_FILE_SHIFT3, -1UL, PTE_FILE_LSHIFT3)); |
} |
|
static __always_inline pte_t pgoff_to_pte(pgoff_t off) |
{ |
return (pte_t){ |
.pte_low = |
pte_bitop(off, 0, PTE_FILE_MASK1, PTE_FILE_SHIFT1) + |
pte_bitop(off, PTE_FILE_LSHIFT2, PTE_FILE_MASK2, PTE_FILE_SHIFT2) + |
pte_bitop(off, PTE_FILE_LSHIFT3, -1UL, PTE_FILE_SHIFT3) + |
_PAGE_FILE, |
}; |
} |
|
/* Encode and de-code a swap entry */ |
#define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1) |
#define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1) |
|
#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS) |
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#define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \ |
& ((1U << SWP_TYPE_BITS) - 1)) |
#define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT) |
#define __swp_entry(type, offset) ((swp_entry_t) { \ |
((type) << (_PAGE_BIT_PRESENT + 1)) \ |
| ((offset) << SWP_OFFSET_SHIFT) }) |
#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 */ |