From cb7e9420202c64360224a800409e11244657d55b Mon Sep 17 00:00:00 2001
From: Joursoir <chat@joursoir.net>
Date: Tue, 28 Sep 2021 00:24:24 +0000
Subject: x86/boot/bios: add calling convention for BIOS_PRINT

---
 arch/x86/boot/bios.inc | 1 +
 1 file changed, 1 insertion(+)

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
-- 
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