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lm4: add warm reboot key combination

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Added a warm reboot key combination that resets the CPU while preserving
RAM contents. This will be helpful in debugging CPU/OS hard hangs since
in conjunction with PSTORE_CONSOLE in the kernel, the kernel log
messages from the previous boot will be preserved.

BUG=chrome-os-partner:12780
TEST=reboot the system using alt-volume_up-r key combination. Upon
rebooting, check pstore contents with "cat /dev/pstore/console-ramoops"
and ensure that they are same as dmesg from the previous boot.

BRANCH=link

Change-Id: I0ec835a4646f442997c04dc3a086d4fac0cf01cf
Signed-off-by: Sameer Nanda <snanda@chromium.org>
Reviewed-on: https://gerrit.chromium.org/gerrit/31992
Reviewed-by: Randall Spangler <rspangler@chromium.org>
This commit is contained in:
Sameer Nanda
2012-08-30 17:40:02 -07:00
committed by Gerrit
parent 1276132c33
commit f7c03d5dba
1 changed files with 35 additions and 1 deletions
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36
chip/lm4/keyboard_scan.c
View File

@@ -17,6 +17,7 @@
#include "task.h"
#include "timer.h"
#include "util.h"
#include "x86_power.h"
/* Console output macros */
#define CPUTS(outstr) cputs(CC_KEYSCAN, outstr)
@@ -60,6 +61,16 @@ static const uint8_t actual_key_masks[4][KB_COLS] = {
#define MASK_INDEX_REFRESH 2
#define MASK_VALUE_REFRESH 0x04
/* Key masks and values for warm reboot combination */
#define MASK_INDEX_KEYR 3
#define MASK_VALUE_KEYR 0x80
#define MASK_INDEX_VOL_UP 4
#define MASK_VALUE_VOL_UP 0x01
#define MASK_INDEX_RIGHT_ALT 10
#define MASK_VALUE_RIGHT_ALT 0x01
#define MASK_INDEX_LEFT_ALT 10
#define MASK_VALUE_LEFT_ALT 0x40
static void wait_for_interrupt(void)
{
CPRINTF("[%T KB wait]\n");
@@ -119,12 +130,24 @@ static void print_raw_state(const char *msg)
CPUTS("]\n");
}
static int check_warm_reboot_keys(void)
{
if (raw_state[MASK_INDEX_KEYR] == MASK_VALUE_KEYR &&
raw_state[MASK_INDEX_VOL_UP] == MASK_VALUE_VOL_UP &&
(raw_state[MASK_INDEX_RIGHT_ALT] == MASK_VALUE_RIGHT_ALT ||
raw_state[MASK_INDEX_LEFT_ALT] == MASK_VALUE_LEFT_ALT))
return 1;
return 0;
}
/* Return 1 if any key is still pressed, 0 if no key is pressed. */
static int check_keys_changed(void)
{
int c, c2;
uint8_t r;
int change = 0;
int num_press = 0;
uint8_t keys[KB_COLS];
for (c = 0; c < KB_COLS; c++) {
@@ -188,8 +211,19 @@ static int check_keys_changed(void)
}
}
if (change)
/* Count number of key pressed */
for (c = 0; c < KB_COLS; c++) {
if (raw_state[c])
++num_press;
}
if (change) {
if (num_press == 3) {
if (check_warm_reboot_keys())
x86_power_reset(0);
}
print_raw_state("state");
}
out:
/* Return non-zero if at least one key is pressed */