[comboot] Implement INT 22h AX=000Bh (Get Serial Console Configuration)

Signed-off-by: Michael Brown <mcb30@etherboot.org>

diff --git a/src/arch/i386/interface/syslinux/comboot_call.c b/src/arch/i386/interface/syslinux/comboot_call.c
index 30fb49a..08fd173 100644 (file)
--- a/src/arch/i386/interface/syslinux/comboot_call.c
+++ b/src/arch/i386/interface/syslinux/comboot_call.c
@@ -39,6 +39,8 @@ FILE_LICENCE ( GPL2_OR_LATER );
 #include <gpxe/init.h>
 #include <gpxe/image.h>
 #include <usr/imgmgmt.h>
+#include "config/console.h"
+#include "config/serial.h"
 
 /** The "SYSLINUX" version string */
 static char __data16_array ( syslinux_version, [] ) = "gPXE " VERSION;
@@ -456,8 +458,14 @@ static __asmcall void int22 ( struct i386_all_regs *ix86 ) {
                break;
 
        case 0x000B: /* Get Serial Console Configuration */
-               /* FIXME: stub */
+#if defined(CONSOLE_SERIAL) && !defined(COMPRESERVE)
+               ix86->regs.dx = COMCONSOLE;
+               ix86->regs.cx = 115200 / COMSPEED;
+               ix86->regs.bx = 0;
+#else
                ix86->regs.dx = 0;
+#endif
+
                ix86->flags &= ~CF;
                break;