diff options
Diffstat (limited to 'kernel/riscv.h')
| -rw-r--r-- | kernel/riscv.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/riscv.h b/kernel/riscv.h index 5ede50a..7d6eb6e 100644 --- a/kernel/riscv.h +++ b/kernel/riscv.h @@ -353,6 +353,7 @@ typedef uint64 *pagetable_t; // 512 PTEs #define PTE_X (1L << 3) #define PTE_U (1L << 4) // user can access #define PTE_A (1L << 6) // riscv access bit +#define PTE_C (1L << 8) // RSW low bit, use it to mark whether a page is COW // shift a physical address to the right place for a PTE. #define PA2PTE(pa) ((((uint64)pa) >> 12) << 10) |