From ec6363dc48540db67a5966dc9987b192c26fcae1 Mon Sep 17 00:00:00 2001 From: Jordan Crouse Date: Mon, 20 Oct 2008 17:07:26 +0000 Subject: [PATCH] libpayload: Bail if the keyboard controller isn't there If the system in question does not have a superIO, then a read of 0x64 will return 0xFF and we will loop forever. Signed-off-by: Jordan Crouse Acked-by: Patrick Georgi git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3675 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1 --- payloads/libpayload/drivers/keyboard.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'payloads/libpayload/drivers/keyboard.c') diff --git a/payloads/libpayload/drivers/keyboard.c b/payloads/libpayload/drivers/keyboard.c index 0bf7c56161..95827463ca 100644 --- a/payloads/libpayload/drivers/keyboard.c +++ b/payloads/libpayload/drivers/keyboard.c @@ -175,11 +175,10 @@ static void keyboard_cmd(unsigned char cmd, unsigned char val) while (inb(0x64) & 2); } - int keyboard_havechar(void) { unsigned char c = inb(0x64); - return c & 1; + return (c == 0xFF) ? 0 : c & 1; } unsigned char keyboard_get_scancode(void) @@ -332,6 +331,12 @@ void keyboard_init(void) u8 mode; map = &keyboard_layouts[0]; + /* If 0x64 returns 0xff, then we have no keyboard + * controller */ + + if (inb(0x64) == 0xFF) + return; + /* Empty keyboard buffer */ while (keyboard_havechar()) keyboard_getchar(); -- cgit v1.2.3