| | 1 | /** Page table and page directory flags. |
| | 2 | * |
| | 3 | * From intel-sys.pdf. |
| | 4 | * |
| | 5 | * @author Jacob Potter (jdpotter) |
| | 6 | */ |
| | 7 | |
| | 8 | #ifndef _VM_FLAGS_H |
| | 9 | #define _VM_FLAGS_H |
| | 10 | |
| | 11 | #define PTE_FOR(x) (((unsigned int)(x) >> 12) & 0x3FF) |
| | 12 | #define PDE_FOR(x) ((unsigned int)(x) >> 22) |
| | 13 | #define ADDR_12_MASK(x) ((unsigned int)(x) & ~((1 << 12) - 1)) |
| | 14 | #define ADDR_22_MASK(x) ((unsigned int)(x) & ~((1 << 22) - 1)) |
| | 15 | #define LOWER_12(x) ((unsigned int)(x) & ((1 << 12) - 1)) |
| | 16 | #define LOWER_22(x) ((unsigned int)(x) & ((1 << 22) - 1)) |
| | 17 | |
| | 18 | #define PDE_4M_ADDR_SHIFT 22 |
| | 19 | #define PTE_4K_ADDR_SHIFT 12 |
| | 20 | #define PDE_TABLE_ADDR_SHIFT 12 |
| | 21 | #define PTE_FRAME_ADDR_MASK (~((1 << PTE_4K_ADDR_SHIFT) - 1)) |
| | 22 | #define PDE_TABLE_ADDR_MASK (~((1 << PDE_TABLE_ADDR_SHIFT) - 1)) |
| | 23 | |
| | 24 | #define PDE_ATTRIB_INDEX (1 << 12) |
| | 25 | #define PDE_GLOBAL (1 << 8) |
| | 26 | #define PDE_PAGE_SIZE (1 << 7) |
| | 27 | #define PDE_DIRTY (1 << 6) |
| | 28 | #define PDE_ACCESSED (1 << 5) |
| | 29 | #define PDE_NO_CACHE (1 << 4) |
| | 30 | #define PDE_WRITE_THROUGH (1 << 3) |
| | 31 | #define PDE_USER (1 << 2) |
| | 32 | #define PDE_READ_WRITE (1 << 1) |
| | 33 | #define PDE_PRESENT (1 << 0) |
| | 34 | |
| | 35 | #define PTE_GLOBAL (1 << 8) |
| | 36 | #define PTE_ATTRIB_INDEX (1 << 7) |
| | 37 | #define PTE_DIRTY (1 << 6) |
| | 38 | #define PTE_ACCESSED (1 << 5) |
| | 39 | #define PTE_NO_CACHE (1 << 4) |
| | 40 | #define PTE_WRITE_THROUGH (1 << 3) |
| | 41 | #define PTE_USER (1 << 2) |
| | 42 | #define PTE_READ_WRITE (1 << 1) |
| | 43 | #define PTE_PRESENT (1 << 0) |
| | 44 | |
| | 45 | #endif /* _VM_FLAGS_H */ |
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