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-rw-r--r--arch/x86/boot/bios.inc1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/boot/bios.inc b/arch/x86/boot/bios.inc
index d01b27c..19cd9a0 100644
--- a/arch/x86/boot/bios.inc
+++ b/arch/x86/boot/bios.inc
@@ -1,3 +1,4 @@
+# CONVENTION: macro only uses %AX, %SI registers
.macro BIOS_PRINT string
mov $0x0e, %ah # Set writing char in TTY mode routine
mov \string, %si # Set in Source Index reg the beginning