Add a Pixel-specific implementation of IBootControl HAL.

This is in preparation for supporting IBootControl 1.1 for Virtual A/B.

The "legacy" implementation is designed for devices running kernel
versions 4.14 or lower, which rely on the older hardware/qcom/bootctrl
module and a device-specific GPT library. It is currently identical to
the default HAL for IBootControl 1.0. (The default 1.1 implementation
will not wrap legacy libhardware HALs.)

Bug: 141131816
Test: vts
Change-Id: I6fc1ef3f7b8873ab0ad029baf72082bdd202edef

3 files changed, 210 insertions, 0 deletions

diff --git a/bootctrl/Android.bp b/bootctrl/Android.bp
new file mode 100644
index 0000000..dba4818
--- /dev/null
+++ b/bootctrl/Android.bp
@@ -0,0 +1,21 @@
+cc_library {
+    name: "android.hardware.boot@1.0-impl-pixel-legacy",
+    vendor: true,
+    recovery_available: true,
+    srcs: [
+        "LegacyBootControl.cpp",
+    ],
+    cflags: [
+        "-Wall",
+        "-Werror",
+    ],
+    relative_install_path: "hw",
+    shared_libs: [
+        "libbase",
+        "liblog",
+        "libhardware",
+        "libhidlbase",
+        "libutils",
+        "android.hardware.boot@1.0",
+    ],
+}
diff --git a/bootctrl/LegacyBootControl.cpp b/bootctrl/LegacyBootControl.cpp
new file mode 100644
index 0000000..e96bb88
--- /dev/null
+++ b/bootctrl/LegacyBootControl.cpp
@@ -0,0 +1,131 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+#define LOG_TAG "android.hardware.boot@1.0-impl"
+
+#include <log/log.h>
+
+#include <hardware/boot_control.h>
+#include <hardware/hardware.h>
+#include "LegacyBootControl.h"
+
+#ifdef BOOT_CONTROL_RECOVERY
+extern const hw_module_t HAL_MODULE_INFO_SYM;
+#endif
+
+namespace android {
+namespace hardware {
+namespace boot {
+namespace V1_0 {
+namespace implementation {
+
+BootControl::BootControl(boot_control_module_t *module) : mModule(module) {}
+
+// Methods from ::android::hardware::boot::V1_0::IBootControl follow.
+Return<uint32_t> BootControl::getNumberSlots() {
+    return mModule->getNumberSlots(mModule);
+}
+
+Return<uint32_t> BootControl::getCurrentSlot() {
+    return mModule->getCurrentSlot(mModule);
+}
+
+Return<void> BootControl::markBootSuccessful(markBootSuccessful_cb _hidl_cb) {
+    int ret = mModule->markBootSuccessful(mModule);
+    struct CommandResult cr;
+    cr.success = (ret == 0);
+    cr.errMsg = strerror(-ret);
+    _hidl_cb(cr);
+    return Void();
+}
+
+Return<void> BootControl::setActiveBootSlot(uint32_t slot, setActiveBootSlot_cb _hidl_cb) {
+    int ret = mModule->setActiveBootSlot(mModule, slot);
+    struct CommandResult cr;
+    cr.success = (ret == 0);
+    cr.errMsg = strerror(-ret);
+    _hidl_cb(cr);
+    return Void();
+}
+
+Return<void> BootControl::setSlotAsUnbootable(uint32_t slot, setSlotAsUnbootable_cb _hidl_cb) {
+    int ret = mModule->setSlotAsUnbootable(mModule, slot);
+    struct CommandResult cr;
+    cr.success = (ret == 0);
+    cr.errMsg = strerror(-ret);
+    _hidl_cb(cr);
+    return Void();
+}
+
+Return<BoolResult> BootControl::isSlotBootable(uint32_t slot) {
+    int32_t ret = mModule->isSlotBootable(mModule, slot);
+    if (ret < 0) {
+        return BoolResult::INVALID_SLOT;
+    }
+    return ret ? BoolResult::TRUE : BoolResult::FALSE;
+}
+
+Return<BoolResult> BootControl::isSlotMarkedSuccessful(uint32_t slot) {
+    int32_t ret = mModule->isSlotMarkedSuccessful(mModule, slot);
+    if (ret < 0) {
+        return BoolResult::INVALID_SLOT;
+    }
+    return ret ? BoolResult::TRUE : BoolResult::FALSE;
+}
+
+Return<void> BootControl::getSuffix(uint32_t slot, getSuffix_cb _hidl_cb) {
+    hidl_string ans;
+    const char *suffix = mModule->getSuffix(mModule, slot);
+    if (suffix) {
+        ans = suffix;
+    }
+    _hidl_cb(ans);
+    return Void();
+}
+
+#ifdef BOOT_CONTROL_RECOVERY
+IBootControl *HIDL_FETCH_IBootControl(const char * /* hal */) {
+    boot_control_module_t *module;
+
+    // For devices that don't build a standalone libhardware bootctrl impl for recovery,
+    // we simulate the hw_get_module() by accessing it from the current process directly.
+    const hw_module_t *hw_module = &HAL_MODULE_INFO_SYM;
+    if (!hw_module || strcmp(BOOT_CONTROL_HARDWARE_MODULE_ID, hw_module->id) != 0) {
+        ALOGE("Error loading boot_control HAL implementation: %d.", -EINVAL);
+        return nullptr;
+    }
+    module = reinterpret_cast<boot_control_module_t *>(const_cast<hw_module_t *>(hw_module));
+    module->init(module);
+    return new BootControl(module);
+}
+#else
+IBootControl *HIDL_FETCH_IBootControl(const char * /* hal */) {
+    int ret = 0;
+    boot_control_module_t *module = NULL;
+    hw_module_t **hwm = reinterpret_cast<hw_module_t **>(&module);
+    ret = hw_get_module(BOOT_CONTROL_HARDWARE_MODULE_ID, const_cast<const hw_module_t **>(hwm));
+    if (ret) {
+        ALOGE("hw_get_module %s failed: %d", BOOT_CONTROL_HARDWARE_MODULE_ID, ret);
+        return nullptr;
+    }
+    module->init(module);
+    return new BootControl(module);
+}
+#endif
+}  // namespace implementation
+}  // namespace V1_0
+}  // namespace boot
+}  // namespace hardware
+}  // namespace android
diff --git a/bootctrl/LegacyBootControl.h b/bootctrl/LegacyBootControl.h
new file mode 100644
index 0000000..d50e789
--- /dev/null
+++ b/bootctrl/LegacyBootControl.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (C) 2016 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.
+ */
+#ifndef ANDROID_HARDWARE_BOOT_V1_0_BOOTCONTROL_H
+#define ANDROID_HARDWARE_BOOT_V1_0_BOOTCONTROL_H
+
+#include <android/hardware/boot/1.0/IBootControl.h>
+#include <hidl/Status.h>
+
+#include <hidl/MQDescriptor.h>
+namespace android {
+namespace hardware {
+namespace boot {
+namespace V1_0 {
+namespace implementation {
+
+using ::android::sp;
+using ::android::hardware::Return;
+using ::android::hardware::boot::V1_0::BoolResult;
+using ::android::hardware::boot::V1_0::IBootControl;
+
+struct BootControl : public IBootControl {
+    BootControl(boot_control_module_t *module);
+    // Methods from ::android::hardware::boot::V1_0::IBootControl follow.
+    Return<uint32_t> getNumberSlots() override;
+    Return<uint32_t> getCurrentSlot() override;
+    Return<void> markBootSuccessful(markBootSuccessful_cb _hidl_cb) override;
+    Return<void> setActiveBootSlot(uint32_t slot, setActiveBootSlot_cb _hidl_cb) override;
+    Return<void> setSlotAsUnbootable(uint32_t slot, setSlotAsUnbootable_cb _hidl_cb) override;
+    Return<BoolResult> isSlotBootable(uint32_t slot) override;
+    Return<BoolResult> isSlotMarkedSuccessful(uint32_t slot) override;
+    Return<void> getSuffix(uint32_t slot, getSuffix_cb _hidl_cb) override;
+
+  private:
+    boot_control_module_t *mModule;
+};
+
+extern "C" IBootControl *HIDL_FETCH_IBootControl(const char *name);
+
+}  // namespace implementation
+}  // namespace V1_0
+}  // namespace boot
+}  // namespace hardware
+}  // namespace android
+
+#endif  // ANDROID_HARDWARE_BOOT_V1_0_BOOTCONTROL_H