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authorMasahisa Kojima <masahisa.kojima@linaro.org>2022-02-22 09:58:30 +0900
committerHeinrich Schuchardt <heinrich.schuchardt@canonical.com>2022-02-26 07:37:01 +0100
commit3fa9ed9ae3b30dd6e7f5e887c76d183ad72a44a2 (patch)
treeb446ed1c80e146970e790f2cb6455e68c7a69cef /lib
parent3e6f81000672e6d0d88fde9c7ad5b01414eccf86 (diff)
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efi_loader: update the timing of enabling and disabling EFI watchdog
UEFI specification requires that 5 minutes watchdog timer is armed before the firmware's boot manager invokes an EFI boot option. This watchdog timer is updated as follows, according to the UEFI specification. 1) The EFI Image may reset or disable the watchdog timer as needed. 2) If control is returned to the firmware's boot manager, the watchdog timer must be disabled. 3) On successful completion of EFI_BOOT_SERVICES.ExitBootServices() the watchdog timer is disabled. 1) is up to the EFI image, and 3) is already implemented in U-Boot. This patch implements 2), the watchdog is disabled when control is returned to U-Boot. In addition, current implementation arms the EFI watchdog at only the first "bootefi" invocation. The EFI watchdog must be armed in every EFI boot option invocation. Signed-off-by: Masahisa Kojima <masahisa.kojima@linaro.org> Reviewed-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Diffstat (limited to 'lib')
-rw-r--r--lib/efi_loader/efi_watchdog.c13
1 files changed, 1 insertions, 12 deletions
diff --git a/lib/efi_loader/efi_watchdog.c b/lib/efi_loader/efi_watchdog.c
index 87ca6c5..d741076 100644
--- a/lib/efi_loader/efi_watchdog.c
+++ b/lib/efi_loader/efi_watchdog.c
@@ -75,17 +75,6 @@ efi_status_t efi_watchdog_register(void)
printf("ERROR: Failed to register watchdog event\n");
return r;
}
- /*
- * The UEFI standard requires that the watchdog timer is set to five
- * minutes when invoking an EFI boot option.
- *
- * Unified Extensible Firmware Interface (UEFI), version 2.7 Errata A
- * 7.5. Miscellaneous Boot Services - EFI_BOOT_SERVICES.SetWatchdogTimer
- */
- r = efi_set_watchdog(300);
- if (r != EFI_SUCCESS) {
- printf("ERROR: Failed to set watchdog timer\n");
- return r;
- }
+
return EFI_SUCCESS;
}