vendorcode/dasharo: add function to wipe options

Signed-off-by: Michał Kopeć <[email protected]>

src/vendorcode/dasharo/include/dasharo/options.h

@@ -53,6 +53,15 @@ struct battery_config {
 	uint8_t stop_threshold;
 } __packed;
 
+/* Attempts to wipe the SMMSTORE region in order to reset EFI options.
+ * UEFIPayload will populate it with default values upon boot.
+ *
+ * Result:
+ *  - CB_SUCCESS - Success
+ *  - CB_ERR - Failure, including partial wipe
+ */
+enum cb_err dasharo_reset_options(void);
+
 /* Looks up "power_on_after_fail" option and Dasharo/"PowerFailureState"
  * variable.
  *

src/vendorcode/dasharo/options.c

@@ -52,6 +52,21 @@ static enum cb_err read_bool_var(const char *var_name, bool *var)
 	return CB_ERR;
 }
 
+enum cb_err dasharo_reset_options(void)
+{
+	struct region_device rdev;
+	ssize_t res;
+
+	if (smmstore_lookup_region(&rdev))
+		return CB_ERR;
+
+	res = rdev_eraseat(&rdev, 0, region_device_sz(&rdev));
+	if (res != region_device_sz(&rdev))
+		return CB_ERR;
+
+	return CB_SUCCESS;
+}
+
 uint8_t dasharo_get_power_on_after_fail(void)
 {
 	uint8_t power_status;