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sysreset: Add SYSRESET_TO_FIRMWARE_UI with reset -u support

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Add new SYSRESET_TO_FIRMWARE_UI reset type to allow resetting directly
to firmware UI. This is implemented via the reset command's new -u flag.

For the EFI app, this sets the EFI_OS_INDICATIONS_BOOT_TO_FW_UI bit in
the OsIndications variable before performing a warm reset, causing the
firmware to boot to its setup interface.

Co-developed-by: Claude <noreply@anthropic.com>
Signed-off-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Simon Glass
2025-08-29 07:54:17 -06:00
parent 1ad04a7895
commit 96adc477be
7 changed files with 44 additions and 1 deletions
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27
lib/efi_client/efi_app.c
View File

@@ -16,6 +16,7 @@
#include <efi.h>
#include <efi_api.h>
#include <efi_stub.h>
#include <efi_variable.h>
#include <errno.h>
#include <fdt_simplefb.h>
#include <image.h>
@@ -253,6 +254,32 @@ static int efi_sysreset_request(struct udevice *dev, enum sysreset_t type)
struct efi_priv *priv = efi_get_priv();
switch (type) {
case SYSRESET_TO_FIRMWARE_UI: {
efi_status_t ret;
u64 osind;
/* Read current OsIndications value */
osind = 0;
ret = efi_get_variable_int(u"OsIndications",
&efi_global_variable_guid,
NULL, NULL, &osind, NULL);
if (ret && ret != EFI_NOT_FOUND)
log_warning("Failed to read OsIndications: %lx\n", ret);
/* Set the boot-to-firmware-UI bit */
osind |= EFI_OS_INDICATIONS_BOOT_TO_FW_UI;
ret = efi_set_variable_int(u"OsIndications",
&efi_global_variable_guid,
EFI_VARIABLE_NON_VOLATILE |
EFI_VARIABLE_BOOTSERVICE_ACCESS |
EFI_VARIABLE_RUNTIME_ACCESS,
sizeof(osind), &osind, false);
if (ret) {
log_err("Failed to set OsIndications: %lx\n", ret);
return -EIO;
}
fallthrough;
}
case SYSRESET_WARM:
priv->run->reset_system(EFI_RESET_WARM, EFI_SUCCESS, 0, NULL);
break;