bootctrl: Add support for A/B data in devinfo

Bug: 156694052
Signed-off-by: Fernando Lugo <flugo@google.com>
Change-Id: I6f1e3b805e3bcef2246abcffc8c11add29798bc6

interfaces/boot/1.2/DevInfo.h

@@ -0,0 +1,61 @@
+/*
+ * Copyright (C) 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+namespace android {
+namespace hardware {
+namespace boot {
+namespace V1_2 {
+namespace implementation {
+
+//
+// definitions taken from ABL code
+//
+
+constexpr uint32_t DEVINFO_MAGIC = 0x49564544;
+constexpr size_t DEVINFO_AB_SLOT_COUNT = 2;
+
+struct devinfo_ab_slot_data_t {
+    uint8_t retry_count;
+    uint8_t unbootable : 1;
+    uint8_t successful : 1;
+    uint8_t active : 1;
+    uint8_t fastboot_ok : 1;
+    uint8_t : 4;
+    uint8_t unused[2];
+} __attribute__((packed));
+
+typedef struct {
+    devinfo_ab_slot_data_t slots[DEVINFO_AB_SLOT_COUNT];
+} __attribute__((packed)) devinfo_ab_data_t;
+
+struct devinfo_t {
+    uint32_t magic;
+    uint16_t ver_major;
+    uint16_t ver_minor;
+    uint8_t unused[40];
+    devinfo_ab_data_t ab_data;
+    uint8_t unused1[72];  // use remaining up to complete 128 bytes
+} __attribute__((packed));
+
+static_assert(sizeof(devinfo_t) == 128, "invalid devinfo struct size");
+
+}  // namespace implementation
+}  // namespace V1_2
+}  // namespace boot
+}  // namespace hardware
+}  // namespace android