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-rw-r--r--kernel/riscv.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/kernel/riscv.h b/kernel/riscv.h
index 645a775..20a01db 100644
--- a/kernel/riscv.h
+++ b/kernel/riscv.h
@@ -295,7 +295,7 @@ r_sp()
return x;
}
-// read and write tp, the thread pointer, which holds
+// read and write tp, the thread pointer, which xv6 uses to hold
// this core's hartid (core number), the index into cpus[].
static inline uint64
r_tp()
@@ -342,7 +342,7 @@ typedef uint64 *pagetable_t; // 512 PTEs
#define PTE_R (1L << 1)
#define PTE_W (1L << 2)
#define PTE_X (1L << 3)
-#define PTE_U (1L << 4) // 1 -> user can access
+#define PTE_U (1L << 4) // user can access
// shift a physical address to the right place for a PTE.
#define PA2PTE(pa) ((((uint64)pa) >> 12) << 10)