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-rw-r--r--os/boot/pc/mem.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/os/boot/pc/mem.h b/os/boot/pc/mem.h
index d33fee0e..15760c0c 100644
--- a/os/boot/pc/mem.h
+++ b/os/boot/pc/mem.h
@@ -34,8 +34,8 @@
#define CPU0PTE 0x80003000 /* bootstrap processor PTE's for 0-4MB */
#define MACHADDR 0x80004000 /* as seen by current processor */
#define CPU0MACH 0x80005000 /* Mach for bootstrap processor */
-#define MACHSIZE (BY2PG*8) /* stack size */
-
+#define BIOSXCHG 0x80006000 /* To exchange data with the BIOS */
+#define MACHSIZE (BY2PG*8) /* stack size */
/*
* Address spaces