rombios: Protect the ax register before calling the TCG BIOS extensions function.

Signed-off-by: Stefan Berger <stefanb@us.ibm.com>

diff --git a/tools/firmware/rombios/rombios.c b/tools/firmware/rombios/rombios.c
index d9602220489a8008ef172984a17f33bd4be537ce..914fdcee197ef9117a381b66ff932398395d2c58 100644 (file)
--- a/tools/firmware/rombios/rombios.c
+++ b/tools/firmware/rombios/rombios.c
@@ -10447,7 +10447,9 @@ rom_scan:
   ;;   3         ROM initialization entry point (FAR CALL)
 
 #if BX_TCGBIOS
+  push ax
   call _tcpa_start_option_rom_scan    /* specs: 3.2.3.3 + 10.4.3 */
+  pop ax
 #endif
 
 rom_scan_loop: