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-rw-r--r--kernel/riscv.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/riscv.h b/kernel/riscv.h
index 20a01db..33fa9ee 100644
--- a/kernel/riscv.h
+++ b/kernel/riscv.h
@@ -343,6 +343,7 @@ typedef uint64 *pagetable_t; // 512 PTEs
#define PTE_W (1L << 2)
#define PTE_X (1L << 3)
#define PTE_U (1L << 4) // user can access
+#define PTE_A (1L << 6) // riscv access bit
// shift a physical address to the right place for a PTE.
#define PA2PTE(pa) ((((uint64)pa) >> 12) << 10)