Create gs201 device folder baseline

clone from gs101 sha 9d1c97c2

Bug: 183183095
Change-Id: Ie7112bdf0aceb33c9e1956aa52e961b670582733

interfaces/boot/1.0/Android.bp

@@ -0,0 +1,66 @@
+//
+// Copyright (C) 2019 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.
+
+package {
+    // See: http://go/android-license-faq
+    // A large-scale-change added 'default_applicable_licenses' to import
+    // all of the 'license_kinds' from "//device/google/gs101:device_google_gs101_license"
+    // to get the below license kinds:
+    //   SPDX-license-identifier-Apache-2.0
+    default_applicable_licenses: [
+        "//device/google/gs101:device_google_gs101_license",
+    ],
+}
+
+cc_binary {
+    name: "android.hardware.boot@1.0-service-gs101",
+    defaults: ["hidl_defaults"],
+    relative_install_path: "hw",
+    vendor: true,
+    init_rc: ["android.hardware.boot@1.0-service-gs101.rc"],
+    srcs: [
+        "BootControl.cpp",
+        "GptUtils.cpp",
+        "service.cpp"
+    ],
+    shared_libs: [
+        "libbase",
+        "liblog",
+        "libhidlbase",
+        "libutils",
+        "libcutils",
+        "libz",
+        "android.hardware.boot@1.0",
+    ],
+}
+
+cc_library {
+    name: "android.hardware.boot@1.0-impl-gs101",
+    recovery: true,
+    srcs: [
+        "BootControl.cpp",
+        "GptUtils.cpp",
+    ],
+    relative_install_path: "hw",
+    shared_libs: [
+        "libbase",
+        "liblog",
+        "libhidlbase",
+        "libutils",
+        "libcutils",
+        "libz",
+        "android.hardware.boot@1.0",
+    ],
+}

interfaces/boot/1.0/BootControl.cpp

@@ -0,0 +1,272 @@
+/*
+ * Copyright (C) 2019 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 "bootcontrolhal"
+
+#include "BootControl.h"
+#include "GptUtils.h"
+
+#include <android-base/file.h>
+#include <cutils/properties.h>
+#include <log/log.h>
+
+namespace android {
+namespace hardware {
+namespace boot {
+namespace V1_0 {
+namespace implementation {
+
+namespace {
+
+#define BOOT_A_PATH     "/dev/block/by-name/boot_a"
+#define BOOT_B_PATH     "/dev/block/by-name/boot_b"
+
+// slot flags
+#define AB_ATTR_PRIORITY_SHIFT      52
+#define AB_ATTR_PRIORITY_MASK       (3UL << AB_ATTR_PRIORITY_SHIFT)
+#define AB_ATTR_ACTIVE_SHIFT        54
+#define AB_ATTR_ACTIVE              (1UL << AB_ATTR_ACTIVE_SHIFT)
+#define AB_ATTR_RETRY_COUNT_SHIFT   (55)
+#define AB_ATTR_RETRY_COUNT_MASK    (7UL << AB_ATTR_RETRY_COUNT_SHIFT)
+#define AB_ATTR_SUCCESSFUL          (1UL << 58)
+#define AB_ATTR_UNBOOTABLE          (1UL << 59)
+
+#define AB_ATTR_MAX_PRIORITY        3UL
+#define AB_ATTR_MAX_RETRY_COUNT     3UL
+
+static std::string getDevPath(uint32_t slot) {
+    char real_path[PATH_MAX];
+
+    const char *path = slot == 0 ? BOOT_A_PATH : BOOT_B_PATH;
+
+    int ret = readlink(path, real_path, sizeof real_path);
+    if (ret < 0) {
+        ALOGE("readlink failed for boot device %s\n", strerror(errno));
+        return std::string();
+    }
+
+    std::string dp(real_path);
+    // extract /dev/sda.. part
+    return dp.substr(0, sizeof "/dev/block/sdX" - 1);
+}
+
+static bool isSlotFlagSet(uint32_t slot, uint64_t flag) {
+    std::string dev_path = getDevPath(slot);
+    if (dev_path.empty()) {
+        ALOGI("Could not get device path for slot %d\n", slot);
+        return false;
+    }
+
+    GptUtils gpt(dev_path);
+    if (gpt.Load()) {
+        ALOGI("failed to load gpt data\n");
+        return false;
+    }
+
+    gpt_entry *e = gpt.GetPartitionEntry(slot ? "boot_b" : "boot_a");
+    if (e == nullptr) {
+        ALOGI("failed to get gpt entry\n");
+        return false;
+    }
+
+    return !!(e->attr & flag);
+}
+
+static int setSlotFlag(uint32_t slot, uint64_t flag) {
+    std::string dev_path = getDevPath(slot);
+    if (dev_path.empty()) {
+        ALOGI("Could not get device path for slot %d\n", slot);
+        return -1;
+    }
+
+    GptUtils gpt(dev_path);
+    if (gpt.Load()) {
+        ALOGI("failed to load gpt data\n");
+        return -1;
+    }
+
+    gpt_entry *e = gpt.GetPartitionEntry(slot ? "boot_b" : "boot_a");
+    if (e == nullptr) {
+        ALOGI("failed to get gpt entry\n");
+        return -1;
+    }
+
+    e->attr |= flag;
+    gpt.Sync();
+
+    return 0;
+}
+
+}
+
+// Methods from ::android::hardware::boot::V1_0::IBootControl follow.
+Return<uint32_t> BootControl::getNumberSlots() {
+    uint32_t slots = 0;
+
+    if (access(BOOT_A_PATH, F_OK) == 0)
+      slots++;
+
+    if (access(BOOT_B_PATH, F_OK) == 0)
+      slots++;
+
+    return slots;
+}
+
+Return<uint32_t> BootControl::getCurrentSlot() {
+    char suffix[PROPERTY_VALUE_MAX];
+    property_get("ro.boot.slot_suffix", suffix, "_a");
+    return std::string(suffix) == "_b" ? 1 : 0;
+}
+
+Return<void> BootControl::markBootSuccessful(markBootSuccessful_cb _hidl_cb) {
+    if (getNumberSlots() == 0) {
+        // no slots, just return true otherwise Android keeps trying
+        _hidl_cb({true, ""});
+        return Void();
+    }
+    int ret = setSlotFlag(getCurrentSlot(), AB_ATTR_SUCCESSFUL);
+    ret ? _hidl_cb({false, "Failed to set successfull flag"}) : _hidl_cb({true, ""});
+    return Void();
+}
+
+Return<void> BootControl::setActiveBootSlot(uint32_t slot, setActiveBootSlot_cb _hidl_cb) {
+    if (slot >= 2) {
+        _hidl_cb({false, "Invalid slot"});
+        return Void();
+    }
+
+    std::string dev_path = getDevPath(slot);
+    if (dev_path.empty()) {
+        _hidl_cb({false, "Could not get device path for slot"});
+        return Void();
+    }
+
+    GptUtils gpt(dev_path);
+    if (gpt.Load()) {
+        _hidl_cb({false, "failed to load gpt data"});
+        return Void();
+    }
+
+    gpt_entry *active_entry = gpt.GetPartitionEntry(slot == 0 ? "boot_a" : "boot_b");
+    gpt_entry *inactive_entry = gpt.GetPartitionEntry(slot == 0 ? "boot_b" : "boot_a");
+    if (active_entry == nullptr || inactive_entry == nullptr) {
+        _hidl_cb({false, "failed to get entries for boot partitions"});
+        return Void();
+    }
+
+    ALOGV("slot active attributes %lx\n", active_entry->attr);
+    ALOGV("slot inactive attributes %lx\n", inactive_entry->attr);
+
+    char boot_dev[PROPERTY_VALUE_MAX];
+    property_get("ro.boot.bootdevice", boot_dev, "");
+    if (boot_dev[0] == '\0') {
+        _hidl_cb({false, "invalid ro.boot.bootdevice prop"});
+        return Void();
+    }
+
+    std::string boot_lun_path = std::string("/sys/devices/platform/") +
+                                boot_dev + "/pixel/boot_lun_enabled";
+    int fd = open(boot_lun_path.c_str(), O_RDWR);
+    if (fd < 0) {
+        // Try old path for kernels < 5.4
+        // TODO: remove once kernel 4.19 support is deprecated
+        std::string boot_lun_path = std::string("/sys/devices/platform/") +
+                                    boot_dev + "/attributes/boot_lun_enabled";
+        fd = open(boot_lun_path.c_str(), O_RDWR);
+        if (fd < 0) {
+            _hidl_cb({false, "failed to open ufs attr boot_lun_enabled"});
+            return Void();
+        }
+    }
+
+    // update attributes for active and inactive
+    inactive_entry->attr &= ~AB_ATTR_ACTIVE;
+    active_entry->attr = AB_ATTR_ACTIVE | (AB_ATTR_MAX_PRIORITY << AB_ATTR_PRIORITY_SHIFT) |
+                         (AB_ATTR_MAX_RETRY_COUNT << AB_ATTR_RETRY_COUNT_SHIFT);
+
+    //
+    // bBootLunEn
+    // 0x1  => Boot LU A = enabled, Boot LU B = disable
+    // 0x2  => Boot LU A = disable, Boot LU B = enabled
+    //
+    int ret = android::base::WriteStringToFd(slot == 0 ? "1" : "2", fd);
+    close(fd);
+    if (ret < 0) {
+        _hidl_cb({false, "faied to write boot_lun_enabled attribute"});
+        return Void();
+    }
+
+    _hidl_cb({true, ""});
+    return Void();
+}
+
+Return<void> BootControl::setSlotAsUnbootable(uint32_t slot, setSlotAsUnbootable_cb _hidl_cb) {
+    if (slot >= 2) {
+        _hidl_cb({false, "Invalid slot"});
+        return Void();
+    }
+
+    std::string dev_path = getDevPath(slot);
+    if (dev_path.empty()) {
+        _hidl_cb({false, "Could not get device path for slot"});
+        return Void();
+    }
+
+    GptUtils gpt(dev_path);
+    gpt.Load();
+
+    gpt_entry *e = gpt.GetPartitionEntry(slot ? "boot_b" : "boot_a");
+    e->attr |= AB_ATTR_UNBOOTABLE;
+
+    gpt.Sync();
+
+    _hidl_cb({true, ""});
+    return Void();
+}
+
+Return<::android::hardware::boot::V1_0::BoolResult> BootControl::isSlotBootable(uint32_t slot) {
+    if (getNumberSlots() == 0)
+        return BoolResult::FALSE;
+    if (slot >= getNumberSlots())
+        return BoolResult::INVALID_SLOT;
+    return isSlotFlagSet(slot, AB_ATTR_UNBOOTABLE) ? BoolResult::FALSE : BoolResult::TRUE;
+}
+
+Return<::android::hardware::boot::V1_0::BoolResult> BootControl::isSlotMarkedSuccessful(uint32_t slot) {
+    if (getNumberSlots() == 0) {
+        // just return true so that we don't we another call trying to mark it as successful
+        // when there is no slots
+        return BoolResult::TRUE;
+    }
+    if (slot >= getNumberSlots())
+        return BoolResult::INVALID_SLOT;
+    return isSlotFlagSet(slot, AB_ATTR_SUCCESSFUL) ? BoolResult::TRUE : BoolResult::FALSE;
+}
+
+Return<void> BootControl::getSuffix(uint32_t slot, getSuffix_cb _hidl_cb) {
+    _hidl_cb(slot == 0 ? "_a" : slot == 1 ? "_b" : "");
+    return Void();
+}
+
+extern "C" IBootControl* HIDL_FETCH_IBootControl(const char*) {
+    return new BootControl();
+}
+
+}  // namespace implementation
+}  // namespace V1_0
+}  // namespace boot
+}  // namespace hardware
+}  // namespace android

interfaces/boot/1.0/BootControl.h

@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2019 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
+
+#include <android/hardware/boot/1.0/IBootControl.h>
+#include <hidl/MQDescriptor.h>
+#include <hidl/Status.h>
+
+namespace android {
+namespace hardware {
+namespace boot {
+namespace V1_0 {
+namespace implementation {
+
+using ::android::hardware::hidl_array;
+using ::android::hardware::hidl_memory;
+using ::android::hardware::hidl_string;
+using ::android::hardware::hidl_vec;
+using ::android::hardware::Return;
+using ::android::hardware::Void;
+using ::android::sp;
+
+struct BootControl : public IBootControl {
+    // 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<::android::hardware::boot::V1_0::BoolResult> isSlotBootable(uint32_t slot) override;
+    Return<::android::hardware::boot::V1_0::BoolResult> isSlotMarkedSuccessful(uint32_t slot) override;
+    Return<void> getSuffix(uint32_t slot, getSuffix_cb _hidl_cb) override;
+
+    // Methods from ::android::hidl::base::V1_0::IBase follow.
+
+};
+
+// FIXME: most likely delete, this is only for passthrough implementations
+extern "C" IBootControl* HIDL_FETCH_IBootControl(const char* name);
+
+}  // namespace implementation
+}  // namespace V1_0
+}  // namespace boot
+}  // namespace hardware
+}  // namespace android

interfaces/boot/1.0/GptUtils.cpp

@@ -0,0 +1,199 @@
+/*
+ * Copyright (C) 2019 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 "bootcontrolhal"
+
+#include "GptUtils.h"
+
+#include <errno.h>
+#include <log/log.h>
+#include <android-base/file.h>
+#include <linux/fs.h>
+#include <zlib.h>
+
+namespace android {
+namespace hardware {
+namespace boot {
+namespace V1_0 {
+namespace implementation {
+
+namespace {
+
+static int ValidateGptHeader(gpt_header *gpt)
+{
+    if (gpt->signature != GPT_SIGNATURE) {
+        ALOGE("invalid gpt signature 0x%lx\n", gpt->signature);
+        return -1;
+    }
+
+    if (gpt->header_size != sizeof(gpt_header)) {
+        ALOGE("invalid gpt header size %u\n", gpt->header_size);
+        return -1;
+    }
+
+    if (gpt->entry_size != sizeof(gpt_entry)) {
+        ALOGE("invalid gpt entry size %u\n", gpt->entry_size);
+        return -1;
+    }
+
+    return 0;
+}
+
+}
+
+GptUtils::GptUtils(const std::string dev_path) : dev_path(dev_path), fd(0) {}
+
+int GptUtils::Load(void)
+{
+    fd = open(dev_path.c_str(), O_RDWR);
+    if (fd < 0) {
+        ALOGE("failed to open block dev %s, %d\n", dev_path.c_str(), errno);
+        return -1;
+    }
+
+    int ret = ioctl(fd, BLKSSZGET, &block_size);
+    if (ret < 0) {
+        ALOGE("failed to get block size %d\n", errno);
+        return -1;
+    }
+
+    // read primary header
+    lseek64(fd, block_size, SEEK_SET);
+    ret = read(fd, &gpt_primary, sizeof gpt_primary);
+    if (ret < 0) {
+        ALOGE("failed to read gpt primary header %d\n", errno);
+        return -1;
+    }
+
+    if (ValidateGptHeader(&gpt_primary)) {
+        ALOGE("error validating gpt header\n");
+        return -1;
+    }
+
+    // read partition entries
+    entry_array.resize(gpt_primary.entry_count);
+    uint32_t entries_size = gpt_primary.entry_size * gpt_primary.entry_count;
+    lseek64(fd, block_size * gpt_primary.start_lba, SEEK_SET);
+    ret = read(fd, entry_array.data(), entries_size);
+    if (ret < 0) {
+        ALOGE("failed to read gpt partition entries %d\n", errno);
+        return -1;
+    }
+
+    // read gpt back header
+    lseek64(fd, block_size * gpt_primary.backup_lba, SEEK_SET);
+    ret = read(fd, &gpt_backup, sizeof gpt_backup);
+    if (ret < 0) {
+        ALOGE("failed to read gpt backup header %d\n", errno);
+        return -1;
+    }
+
+    if (ValidateGptHeader(&gpt_backup)) {
+        ALOGW("error validating gpt backup\n"); // just warn about it, not fail
+    }
+
+    // Create map <partition name, gpt_entry pointer>
+    auto get_name = [](const uint16_t *efi_name) {
+        char name[37] = {};
+        for (int i = 0; efi_name[i] && i < sizeof name - 1; ++i)
+            name[i] = efi_name[i];
+        return std::string(name);
+    };
+
+    for (auto const &e: entry_array) {
+        if (e.name[0] == 0)
+            break;   // stop at the first partition with no name
+        std::string s = get_name(e.name);
+        entries[s] = const_cast<gpt_entry *>(&e);
+    }
+
+    return 0;
+}
+
+gpt_entry *GptUtils::GetPartitionEntry(std::string name)
+{
+    return entries.find(name) != entries.end() ?  entries[name] : nullptr;
+}
+
+int GptUtils::Sync(void)
+{
+    if (!fd)
+        return -1;
+
+    // calculate crc and check if we need to update gpt
+    gpt_primary.entries_crc32 = crc32(0, reinterpret_cast<uint8_t *>(entry_array.data()),
+                                entry_array.size() * sizeof(gpt_entry));
+
+    // save old crc
+    uint32_t crc = gpt_primary.crc32;
+    gpt_primary.crc32 = 0;
+
+    gpt_primary.crc32 = crc32(0, reinterpret_cast<uint8_t *>(&gpt_primary), sizeof gpt_primary);
+    if (crc == gpt_primary.crc32)
+        return 0; // nothing to do (no changes)
+
+    ALOGI("updating GPT\n");
+
+    lseek64(fd, block_size * gpt_primary.current_lba, SEEK_SET);
+    int ret = write(fd, &gpt_primary, sizeof gpt_primary);
+    if (ret < 0) {
+        ALOGE("failed to write gpt primary header %d\n", errno);
+        return -1;
+    }
+
+    lseek64(fd, block_size * gpt_primary.start_lba, SEEK_SET);
+    ret = write(fd, entry_array.data(), entry_array.size() * sizeof(gpt_entry));
+    if (ret < 0) {
+        ALOGE("failed to write gpt partition entries %d\n", errno);
+        return -1;
+    }
+
+    //update GPT backup entries and backup
+    lseek64(fd, block_size * gpt_backup.start_lba, SEEK_SET);
+    ret = write(fd, entry_array.data(), entry_array.size() * sizeof(gpt_entry));
+    if (ret < 0) {
+        ALOGE("failed to write gpt backup partition entries %d\n", errno);
+        return -1;
+    }
+
+    gpt_backup.entries_crc32 = gpt_primary.entries_crc32;
+    gpt_backup.crc32 = 0;
+    gpt_backup.crc32 = crc32(0, reinterpret_cast<uint8_t *>(&gpt_backup), sizeof gpt_backup);
+    lseek64(fd, block_size * gpt_primary.backup_lba, SEEK_SET);
+    ret = write(fd, &gpt_backup, sizeof gpt_backup);
+    if (ret < 0) {
+        ALOGE("failed to write gpt backup header %d\n", errno);
+        return -1;
+    }
+
+    fsync(fd);
+
+    return 0;
+}
+
+GptUtils::~GptUtils()
+{
+    if (fd) {
+        Sync();
+        close(fd);
+    }
+}
+
+}  // namespace implementation
+}  // namespace V1_0
+}  // namespace boot
+}  // namespace hardware
+}  // namespace android

interfaces/boot/1.0/GptUtils.h

@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2019 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
+
+#include <string>
+#include <vector>
+#include <map>
+
+namespace android {
+namespace hardware {
+namespace boot {
+namespace V1_0 {
+namespace implementation {
+
+#define GPT_SIGNATURE       0x5452415020494645UL
+
+typedef struct {
+    uint8_t type_guid[16];
+    uint8_t guid[16];
+    uint64_t first_lba;
+    uint64_t last_lba;
+    uint64_t attr;
+    uint16_t name[36];
+} __attribute__((packed)) gpt_entry;
+
+typedef struct {
+    uint64_t signature;
+    uint32_t revision;
+    uint32_t header_size;
+    uint32_t crc32;
+    uint32_t reserved;
+    uint64_t current_lba;
+    uint64_t backup_lba;
+    uint64_t first_usable_lba;
+    uint64_t last_usable_lba;
+    uint8_t disk_guid[16];
+    uint64_t start_lba;
+    uint32_t entry_count;
+    uint32_t entry_size;
+    uint32_t entries_crc32;
+} __attribute__((packed)) gpt_header;
+
+class GptUtils {
+   public:
+    GptUtils(const std::string dev_path);
+    int Load(void);
+    gpt_entry *GetPartitionEntry(std::string name);
+    int Sync(void);
+    ~GptUtils();
+
+   private:
+    std::string dev_path;
+    int fd;
+    uint32_t block_size;
+    gpt_header gpt_primary;
+    gpt_header gpt_backup;
+    std::vector<gpt_entry> entry_array;
+    std::map<std::string, gpt_entry *>entries;
+};
+
+}  // namespace implementation
+}  // namespace V1_0
+}  // namespace boot
+}  // namespace hardware
+}  // namespace android

interfaces/boot/1.0/android.hardware.boot@1.0-service-gs101.rc

@@ -0,0 +1,4 @@
+service vendor.boot-hal-1-0 /vendor/bin/hw/android.hardware.boot@1.0-service-gs101
+    class early_hal
+    user root
+    group root

interfaces/boot/1.0/service.cpp

@@ -0,0 +1,47 @@
+/*
+ * 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-service"
+
+#include <log/log.h>
+#include <hidl/HidlTransportSupport.h>
+#include <hidl/Status.h>
+#include <android/hardware/boot/1.0/IBootControl.h>
+#include "BootControl.h"
+
+using ::android::status_t;
+
+using ::android::hardware::boot::V1_0::IBootControl;
+
+using ::android::hardware::boot::V1_0::implementation::BootControl;
+
+int main (int /* argc */, char * /* argv */ []) {
+    // This function must be called before you join to ensure the proper
+    // number of threads are created. The threadpool will never exceed
+    // size one because of this call.
+    ::android::hardware::configureRpcThreadpool(1 /*threads*/, true /*willJoin*/);
+
+    ::android::sp bootctrl = new BootControl();
+    const status_t status = bootctrl->registerAsService();
+    if (status != ::android::OK) {
+        return 1; // or handle error
+    }
+
+    // Adds this thread to the threadpool, resulting in one total
+    // thread in the threadpool. We could also do other things, but
+    // would have to specify 'false' to willJoin in configureRpcThreadpool.
+    ::android::hardware::joinRpcThreadpool();
+    return 1; // joinRpcThreadpool should never return
+}