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Diffstat (limited to 'arch/x86/include/asm/pgtable-2level.h')
-rw-r--r--arch/x86/include/asm/pgtable-2level.h50
1 files changed, 41 insertions, 9 deletions
diff --git a/arch/x86/include/asm/pgtable-2level.h b/arch/x86/include/asm/pgtable-2level.h
index b17edfd2362..e0d199fe1d8 100644
--- a/arch/x86/include/asm/pgtable-2level.h
+++ b/arch/x86/include/asm/pgtable-2level.h
@@ -56,23 +56,55 @@ static inline pte_t native_ptep_get_and_clear(pte_t *xp)
#define pte_none(x) (!(x).pte_low)
/*
- * Bits 0, 6 and 7 are taken, split up the 29 bits of offset
- * into this range:
+ * 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)
+#if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE
+#define PTE_FILE_SHIFT2 (_PAGE_BIT_FILE + 1)
+#define PTE_FILE_SHIFT3 (_PAGE_BIT_PROTNONE + 1)
+#else
+#define PTE_FILE_SHIFT2 (_PAGE_BIT_PROTNONE + 1)
+#define PTE_FILE_SHIFT3 (_PAGE_BIT_FILE + 1)
+#endif
+#define PTE_FILE_BITS1 (PTE_FILE_SHIFT2 - PTE_FILE_SHIFT1 - 1)
+#define PTE_FILE_BITS2 (PTE_FILE_SHIFT3 - PTE_FILE_SHIFT2 - 1)
#define pte_to_pgoff(pte) \
- ((((pte).pte_low >> 1) & 0x1f) + (((pte).pte_low >> 8) << 5))
+ ((((pte).pte_low >> PTE_FILE_SHIFT1) \
+ & ((1U << PTE_FILE_BITS1) - 1)) \
+ + ((((pte).pte_low >> PTE_FILE_SHIFT2) \
+ & ((1U << PTE_FILE_BITS2) - 1)) << PTE_FILE_BITS1) \
+ + (((pte).pte_low >> PTE_FILE_SHIFT3) \
+ << (PTE_FILE_BITS1 + PTE_FILE_BITS2)))
#define pgoff_to_pte(off) \
- ((pte_t) { .pte_low = (((off) & 0x1f) << 1) + \
- (((off) >> 5) << 8) + _PAGE_FILE })
+ ((pte_t) { .pte_low = \
+ (((off) & ((1U << PTE_FILE_BITS1) - 1)) << PTE_FILE_SHIFT1) \
+ + ((((off) >> PTE_FILE_BITS1) & ((1U << PTE_FILE_BITS2) - 1)) \
+ << PTE_FILE_SHIFT2) \
+ + (((off) >> (PTE_FILE_BITS1 + PTE_FILE_BITS2)) \
+ << PTE_FILE_SHIFT3) \
+ + _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) })
+#if _PAGE_BIT_FILE < _PAGE_BIT_PROTNONE
+#define SWP_TYPE_BITS (_PAGE_BIT_FILE - _PAGE_BIT_PRESENT - 1)
+#define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1)
+#else
+#define SWP_TYPE_BITS (_PAGE_BIT_PROTNONE - _PAGE_BIT_PRESENT - 1)
+#define SWP_OFFSET_SHIFT (_PAGE_BIT_FILE + 1)
+#endif
+
+#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS)
+
+#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 })