From c66f5d626731683c046d113bb02063dbb81512d7 Mon Sep 17 00:00:00 2001
From: hpa <hpa>
Date: Tue, 19 Nov 2002 01:00:07 +0000
Subject: [PATCH] Fix the write string ABI call.

---
 NEWS         | 1 +
 isolinux.asm | 5 +++++
 pxelinux.asm | 4 ++++
 3 files changed, 10 insertions(+)

diff --git a/NEWS b/NEWS
index b18f1c5..df3093f 100644
--- a/NEWS
+++ b/NEWS
@@ -12,6 +12,7 @@ Changes in 2.01:
 	  versions, and be able to generate disk images with DOSEMU
 	  headers (controlled by the -d option).
 	* Fix the COM32 sample program.
+	* PXELINUX, ISOLINUX: Fix come COMBOOT API calls.
 
 Changes in 2.00:
 	* ALL: Add support for "COM32" (32-bit COMBOOT) images.
diff --git a/isolinux.asm b/isolinux.asm
index 71f1c58..0cb7eff 100644
--- a/isolinux.asm
+++ b/isolinux.asm
@@ -1307,6 +1307,10 @@ strcpy:		push ax
 ;		since some PXE BIOSes seem to interfere regular console I/O.
 ;
 writechr_full:
+		push ds
+		push cs
+		pop ds
+		mov ax,cs
 		call write_serial	; write to serial port if needed
 		pushfd
 		pushad
@@ -1340,6 +1344,7 @@ writechr_full:
 		int 10h			
 .ret:		popad
 		popfd
+		pop ds
 		ret
 .scroll:	dec dh
 		mov bh,[TextPage]
diff --git a/pxelinux.asm b/pxelinux.asm
index fd00340..c51b764 100644
--- a/pxelinux.asm
+++ b/pxelinux.asm
@@ -1316,6 +1316,9 @@ strcpy:		push ax
 ;		since some PXE BIOSes seem to interfere regular console I/O.
 ;
 writechr:
+		push ds
+		push cs
+		pop ds
 		call write_serial	; write to serial port if needed
 		pushfd
 		pushad
@@ -1349,6 +1352,7 @@ writechr:
 		int 10h			
 .ret:		popad
 		popfd
+		pop ds
 		ret
 .scroll:	dec dh
 		mov bh,[TextPage]
-- 
2.7.4