diff options
| -rw-r--r-- | include/asm-x86/pgtable.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/asm-x86/pgtable.h b/include/asm-x86/pgtable.h index a1eeacdf9d8c..75a656e6b3f8 100644 --- a/include/asm-x86/pgtable.h +++ b/include/asm-x86/pgtable.h | |||
| @@ -19,6 +19,11 @@ | |||
| 19 | #define _PAGE_BIT_UNUSED3 11 | 19 | #define _PAGE_BIT_UNUSED3 11 |
| 20 | #define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */ | 20 | #define _PAGE_BIT_NX 63 /* No execute: only valid after cpuid check */ |
| 21 | 21 | ||
| 22 | /* | ||
| 23 | * Note: we use _AC(1, L) instead of _AC(1, UL) so that we get a | ||
| 24 | * sign-extended value on 32-bit with all 1's in the upper word, | ||
| 25 | * which preserves the upper pte values on 64-bit ptes: | ||
| 26 | */ | ||
| 22 | #define _PAGE_PRESENT (_AC(1, L)<<_PAGE_BIT_PRESENT) | 27 | #define _PAGE_PRESENT (_AC(1, L)<<_PAGE_BIT_PRESENT) |
| 23 | #define _PAGE_RW (_AC(1, L)<<_PAGE_BIT_RW) | 28 | #define _PAGE_RW (_AC(1, L)<<_PAGE_BIT_RW) |
| 24 | #define _PAGE_USER (_AC(1, L)<<_PAGE_BIT_USER) | 29 | #define _PAGE_USER (_AC(1, L)<<_PAGE_BIT_USER) |