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-rw-r--r--kernel/memlayout.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/memlayout.h b/kernel/memlayout.h
index 219c308..13d1705 100644
--- a/kernel/memlayout.h
+++ b/kernel/memlayout.h
@@ -53,3 +53,4 @@
// map the trampoline page to the highest address,
// in both user and kernel space.
#define TRAMPOLINE (MAXVA - PGSIZE)
+#define KSTACK(p) ((TRAMPOLINE-PGSIZE)-p*2*PGSIZE)