diff options
Diffstat (limited to 'src/vendorcode/google/chromeos/vbnv_cmos.c')
| -rw-r--r-- | src/vendorcode/google/chromeos/vbnv_cmos.c | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/src/vendorcode/google/chromeos/vbnv_cmos.c b/src/vendorcode/google/chromeos/vbnv_cmos.c index e0d7ba1ea3..22acefa517 100644 --- a/src/vendorcode/google/chromeos/vbnv_cmos.c +++ b/src/vendorcode/google/chromeos/vbnv_cmos.c @@ -13,6 +13,8 @@ * GNU General Public License for more details. */ +#include <bootstate.h> +#include <console/console.h> #include <types.h> #include <pc80/mc146818rtc.h> #include "vbnv.h" @@ -24,6 +26,21 @@ void read_vbnv_cmos(uint8_t *vbnv_copy) for (i = 0; i < VBNV_BLOCK_SIZE; i++) vbnv_copy[i] = cmos_read(CONFIG_VBNV_OFFSET + 14 + i); + + if (IS_ENABLED(CONFIG_CHROMEOS_VBNV_CMOS_BACKUP_TO_FLASH)) { + if (verify_vbnv(vbnv_copy)) + return; + + printk(BIOS_INFO, "VBNV: CMOS invalid, restoring from flash\n"); + read_vbnv_flash(vbnv_copy); + + if (verify_vbnv(vbnv_copy)) { + save_vbnv_cmos(vbnv_copy); + printk(BIOS_INFO, "VBNV: Flash backup restored\n"); + } else { + printk(BIOS_INFO, "VBNV: Restore from flash failed\n"); + } + } } void save_vbnv_cmos(const uint8_t *vbnv_copy) @@ -33,3 +50,17 @@ void save_vbnv_cmos(const uint8_t *vbnv_copy) for (i = 0; i < VBNV_BLOCK_SIZE; i++) cmos_write(vbnv_copy[i], CONFIG_VBNV_OFFSET + 14 + i); } + +#if IS_ENABLED(CONFIG_CHROMEOS_VBNV_CMOS_BACKUP_TO_FLASH) +static void backup_vbnv_cmos(void *unused) +{ + uint8_t vbnv_cmos[VBNV_BLOCK_SIZE]; + + /* Read current VBNV from CMOS. */ + read_vbnv_cmos(vbnv_cmos); + + /* Save to flash, will only be saved if different. */ + save_vbnv_flash(vbnv_cmos); +} +BOOT_STATE_INIT_ENTRY(BS_POST_DEVICE, BS_ON_EXIT, backup_vbnv_cmos, NULL); +#endif |