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author | Ronald G. Minnich <rminnich@gmail.com> | 2018-09-14 01:21:05 -0700 |
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committer | Ronald G. Minnich <rminnich@gmail.com> | 2018-09-14 09:59:17 +0000 |
commit | 95c331b94b1d04ea34b480c83613c2141a02697e (patch) | |
tree | c21c9753964d6d70e8fec85e9b6f075cac87883f /payloads/linuxcheck/i386.c | |
parent | 374d992fc831300377216fd3f7c3137d4b53ab36 (diff) | |
download | coreboot-95c331b94b1d04ea34b480c83613c2141a02697e.tar.xz |
rampayload: Add the linuxcheck payload
The i386.c file uses standard 3f8 UART for some simple diagnostic
prints, and the libpayload console otherwise.
This payload was used to debug Linux as a rampayload and was very helpful
for that work.
Change-Id: I1cce5528780cd825fd91a88137fa70abd9f218e7
Signed-off-by: Ronald G. Minnich <rminnich@gmail.com>
Reviewed-on: https://review.coreboot.org/28600
Reviewed-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'payloads/linuxcheck/i386.c')
-rw-r--r-- | payloads/linuxcheck/i386.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/payloads/linuxcheck/i386.c b/payloads/linuxcheck/i386.c new file mode 100644 index 0000000000..2b4b541f1e --- /dev/null +++ b/payloads/linuxcheck/i386.c @@ -0,0 +1,48 @@ +/* + * This file is part of the coreinfo project. + * + * Copyright (C) 2018 Google Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <libpayload-config.h> +#include <libpayload.h> +#include "linuxcheck.h" + +void buts(char *s) +{ + int i; + for (i = 0; i < strlen(s); i++) + outb(s[i], 0x3f8); +} + +void hex4(u8 c) +{ + static char *hex = "0123456789abcdef"; + outb(hex[c & 0xf], 0x3f8); +} + +void hex8(u8 c) +{ + hex4(c >> 4); + hex4(c); +} + +void hex16(u16 c) +{ + hex8((u8)(c >> 8)); + hex8((u8)c); +} +void hex32(u32 c) +{ + hex16((u16)(c >> 16)); + hex16((u16)c); +} |