bootctrl: Initial commit for the boot control HAL

This HAL is needed to enable recovery on devices that support A/B
partitions.

Change-Id: Id7600573b6da579ed90aa2a26bed2409d631039d

3 files changed, 665 insertions, 0 deletions

diff --git a/Android.mk b/Android.mk
new file mode 100644
index 0000000..cae83a0
--- /dev/null
+++ b/Android.mk
@@ -0,0 +1,10 @@
+LOCAL_PATH := $(call my-dir)
+include $(CLEAR_VARS)
+LOCAL_C_INCLUDES += hardware/libhardware/include
+LOCAL_C_INCLUDES += $(TARGET_OUT_HEADERS)/gpt-utils/inc
+LOCAL_CFLAGS += -Wall -Werror
+LOCAL_SHARED_LIBRARIES += liblog librecovery_updater_msm
+LOCAL_SRC_FILES := boot_control.c
+LOCAL_MODULE_RELATIVE_PATH := hw
+LOCAL_MODULE := bootctrl.$(TARGET_BOARD_PLATFORM)
+include $(BUILD_SHARED_LIBRARY)
diff --git a/NOTICE b/NOTICE
new file mode 100644
index 0000000..820d40c
--- /dev/null
+++ b/NOTICE
@@ -0,0 +1,26 @@
+Copyright (c) 2016, The Linux Foundation. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+    * Neither the name of The Linux Foundation nor the names of its
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/boot_control.c b/boot_control.c
new file mode 100644
index 0000000..58edf5e
--- /dev/null
+++ b/boot_control.c
@@ -0,0 +1,629 @@
+/*
+ * Copyright (c) 2016, The Linux Foundation. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *     * Redistributions of source code must retain the above copyright
+ *       notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ *       copyright notice, this list of conditions and the following
+ *       disclaimer in the documentation and/or other materials provided
+ *       with the distribution.
+ *     * Neither the name of The Linux Foundation nor the names of its
+ *       contributors may be used to endorse or promote products derived
+ *       from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+#include <errno.h>
+#define LOG_TAG "bootcontrolhal"
+#include <cutils/log.h>
+#include <hardware/boot_control.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <dirent.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <limits.h>
+#include "gpt-utils.h"
+
+#define BOOTDEV_DIR "/dev/block/bootdevice/by-name"
+#define BOOT_IMG_PTN_NAME "boot"
+#define LUN_NAME_END_LOC 14
+
+const char *slot_suffix_arr[] = {
+	AB_SLOT_A_SUFFIX,
+	AB_SLOT_B_SUFFIX,
+	NULL};
+
+enum part_attr_type {
+	ATTR_SLOT_ACTIVE = 0,
+	ATTR_BOOT_SUCCESSFUL,
+	ATTR_UNBOOTABLE,
+};
+
+void boot_control_init(struct boot_control_module *module)
+{
+	if (!module) {
+		ALOGE("Invalid argument passed to %s", __func__);
+		return;
+	}
+	return;
+}
+
+//Get the value of one of the attribute fields for a partition.
+static int get_partition_attribute(char *partname,
+		enum part_attr_type part_attr)
+{
+	struct gpt_disk *disk = NULL;
+	uint8_t *pentry = NULL;
+	int retval = -1;
+	uint8_t *attr = NULL;
+	if (!partname)
+		goto error;
+	disk = gpt_disk_alloc();
+	if (!disk) {
+		ALOGE("%s: Failed to alloc disk struct", __func__);
+		goto error;
+	}
+	if (gpt_disk_get_disk_info(partname, disk)) {
+		ALOGE("%s: Failed to get disk info", __func__);
+		goto error;
+	}
+	pentry = gpt_disk_get_pentry(disk, partname, PRIMARY_GPT);
+	if (!pentry) {
+		ALOGE("%s: pentry does not exist in disk struct",
+				__func__);
+		goto error;
+	}
+	attr = pentry + AB_FLAG_OFFSET;
+	if (part_attr == ATTR_SLOT_ACTIVE)
+		retval = !!(*attr & AB_PARTITION_ATTR_SLOT_ACTIVE);
+	else if (part_attr == ATTR_BOOT_SUCCESSFUL)
+		retval = !!(*attr & AB_PARTITION_ATTR_BOOT_SUCCESSFUL);
+	else if (part_attr == ATTR_UNBOOTABLE)
+		retval = !!(*attr & AB_PARTITION_ATTR_UNBOOTABLE);
+	else
+		retval = -1;
+	gpt_disk_free(disk);
+	return retval;
+error:
+	if (disk)
+		gpt_disk_free(disk);
+	return retval;
+}
+
+//Set a particular attribute for all the partitions in a
+//slot
+static int update_slot_attribute(const char *slot,
+		enum part_attr_type ab_attr)
+{
+	unsigned int i = 0;
+	char buf[PATH_MAX];
+	struct stat st;
+	struct gpt_disk *disk = NULL;
+	uint8_t *pentry = NULL;
+	uint8_t *pentry_bak = NULL;
+	int rc = -1;
+	uint8_t *attr = NULL;
+	uint8_t *attr_bak = NULL;
+	char partName[MAX_GPT_NAME_SIZE + 1] = {0};
+	const char ptn_list[][MAX_GPT_NAME_SIZE] = { AB_PTN_LIST };
+	int slot_name_valid = 0;
+	if (!slot) {
+		ALOGE("%s: Invalid argument", __func__);
+		goto error;
+	}
+	for (i = 0; slot_suffix_arr[i] != NULL; i++)
+	{
+		if (!strncmp(slot, slot_suffix_arr[i],
+					strlen(slot_suffix_arr[i])))
+				slot_name_valid = 1;
+	}
+	if (!slot_name_valid) {
+		ALOGE("%s: Invalid slot name", __func__);
+		goto error;
+	}
+	for (i=0; i < ARRAY_SIZE(ptn_list); i++) {
+		memset(buf, '\0', sizeof(buf));
+		//Check if A/B versions of this ptn exist
+		snprintf(buf, sizeof(buf) - 1,
+                                        "%s/%s%s",
+                                        BOOT_DEV_DIR,
+                                        ptn_list[i],
+					AB_SLOT_A_SUFFIX
+					);
+		if (stat(buf, &st)) {
+			//partition does not have _a version
+			continue;
+		}
+		memset(buf, '\0', sizeof(buf));
+		snprintf(buf, sizeof(buf) - 1,
+                                        "%s/%s%s",
+                                        BOOT_DEV_DIR,
+                                        ptn_list[i],
+					AB_SLOT_B_SUFFIX
+					);
+		if (stat(buf, &st)) {
+			//partition does not have _a version
+			continue;
+		}
+		memset(partName, '\0', sizeof(partName));
+		snprintf(partName,
+				sizeof(partName) - 1,
+				"%s%s",
+				ptn_list[i],
+				slot);
+		disk = gpt_disk_alloc(disk);
+		if (!disk) {
+			ALOGE("%s: Failed to alloc disk struct",
+					__func__);
+			goto error;
+		}
+		rc = gpt_disk_get_disk_info(partName, disk);
+		if (rc != 0) {
+			ALOGE("%s: Failed to get disk info for %s",
+					__func__,
+					partName);
+			goto error;
+		}
+		pentry = gpt_disk_get_pentry(disk, partName, PRIMARY_GPT);
+		pentry_bak = gpt_disk_get_pentry(disk, partName, SECONDARY_GPT);
+		if (!pentry || !pentry_bak) {
+			ALOGE("%s: Failed to get pentry/pentry_bak for %s",
+					__func__,
+					partName);
+			goto error;
+		}
+		attr = pentry + AB_FLAG_OFFSET;
+		attr_bak = pentry_bak + AB_FLAG_OFFSET;
+		if (ab_attr == ATTR_BOOT_SUCCESSFUL) {
+			*attr = (*attr) | AB_PARTITION_ATTR_BOOT_SUCCESSFUL;
+			*attr_bak = (*attr_bak) |
+				AB_PARTITION_ATTR_BOOT_SUCCESSFUL;
+		} else if (ab_attr == ATTR_UNBOOTABLE) {
+			*attr = (*attr) | AB_PARTITION_ATTR_UNBOOTABLE;
+			*attr_bak = (*attr_bak) | AB_PARTITION_ATTR_UNBOOTABLE;
+		} else if (ab_attr == ATTR_SLOT_ACTIVE) {
+			*attr = (*attr) | AB_PARTITION_ATTR_SLOT_ACTIVE;
+			*attr_bak = (*attr) | AB_PARTITION_ATTR_SLOT_ACTIVE;
+		} else {
+			ALOGE("%s: Unrecognized attr", __func__);
+			goto error;
+		}
+		if (gpt_disk_update_crc(disk)) {
+			ALOGE("%s: Failed to update crc for %s",
+					__func__,
+					partName);
+			goto error;
+		}
+		if (gpt_disk_commit(disk)) {
+			ALOGE("%s: Failed to write back entry for %s",
+					__func__,
+					partName);
+			goto error;
+		}
+		gpt_disk_free(disk);
+		disk = NULL;
+	}
+	return 0;
+error:
+	if (disk)
+		gpt_disk_free(disk);
+	return -1;
+}
+
+unsigned get_number_slots(struct boot_control_module *module)
+{
+	struct dirent *de = NULL;
+	DIR *dir_bootdev = NULL;
+	unsigned slot_count = 0;
+	if (!module) {
+		ALOGE("%s: Invalid argument", __func__);
+		goto error;
+	}
+	dir_bootdev = opendir(BOOTDEV_DIR);
+	if (!dir_bootdev) {
+		ALOGE("%s: Failed to open bootdev dir (%s)",
+				__func__,
+				strerror(errno));
+		goto error;
+	}
+	while ((de = readdir(dir_bootdev))) {
+		if (de->d_name[0] == '.')
+			continue;
+		if (!strncmp(de->d_name, BOOT_IMG_PTN_NAME,
+					strlen(BOOT_IMG_PTN_NAME)))
+			slot_count++;
+	}
+	closedir(dir_bootdev);
+	return slot_count;
+error:
+	if (dir_bootdev)
+		closedir(dir_bootdev);
+	return 0;
+}
+
+unsigned get_current_slot(struct boot_control_module *module)
+{
+	uint32_t num_slots = 0;
+	char bootPartition[MAX_GPT_NAME_SIZE + 1];
+	unsigned i = 0;
+	if (!module) {
+		ALOGE("%s: Invalid argument", __func__);
+		goto error;
+	}
+	num_slots = get_number_slots(module);
+	if (num_slots <= 1) {
+		//Slot 0 is the only slot around.
+		return 0;
+	}
+	//Iterate through a list of partitons named as boot+suffix
+	//and see which one is currently active.
+	for (i = 0; slot_suffix_arr[i] != NULL ; i++) {
+		memset(bootPartition, '\0', sizeof(bootPartition));
+		snprintf(bootPartition, sizeof(bootPartition) - 1,
+				"boot%s",
+				slot_suffix_arr[i]);
+		if (get_partition_attribute(bootPartition,
+					ATTR_SLOT_ACTIVE) == 1)
+			return i;
+	}
+error:
+	//The HAL spec requires that we return a number between
+	//0 to num_slots - 1. Since something went wrong here we
+	//are just going to return the default slot.
+	return 0;
+}
+
+int mark_boot_successful(struct boot_control_module *module)
+{
+	unsigned cur_slot = 0;
+	if (!module) {
+		ALOGE("%s: Invalid argument", __func__);
+		goto error;
+	}
+	cur_slot = get_current_slot(module);
+	if (update_slot_attribute(slot_suffix_arr[cur_slot],
+				ATTR_BOOT_SUCCESSFUL)) {
+		goto error;
+	}
+	return 0;
+error:
+	ALOGE("%s: Failed to mark boot successful", __func__);
+	return -1;
+}
+
+const char *get_suffix(struct boot_control_module *module, unsigned slot)
+{
+	unsigned num_slots = 0;
+	if (!module) {
+		ALOGE("%s: Invalid arg", __func__);
+	}
+	num_slots = get_number_slots(module);
+	if (num_slots < 1 || slot > num_slots - 1)
+		return NULL;
+	else
+		return slot_suffix_arr[slot];
+}
+
+int set_active_boot_slot(struct boot_control_module *module, unsigned slot)
+{
+	const char ptn_list[][MAX_GPT_NAME_SIZE] = { AB_PTN_LIST };
+	char slotA[MAX_GPT_NAME_SIZE + 1] = {0};
+	char slotB[MAX_GPT_NAME_SIZE + 1] = {0};
+	char active_guid[TYPE_GUID_SIZE + 1] = {0};
+	char inactive_guid[TYPE_GUID_SIZE + 1] = {0};
+	struct gpt_disk *disk = NULL;
+	//Pointer to partition entry of current 'A' partition
+	uint8_t *pentryA = NULL;
+	uint8_t *pentryA_bak = NULL;
+	//Pointer to partition entry of current 'B' partition
+	uint8_t *pentryB = NULL;
+	uint8_t *pentryB_bak = NULL;
+	uint8_t *slot_info = NULL;
+	uint32_t i;
+	int rc = -1;
+	char buf[PATH_MAX] = {0};
+	struct stat st;
+	unsigned num_slots = 0;
+	unsigned current_slot = 0;
+	int is_ufs = gpt_utils_is_ufs_device();
+
+	if (!module) {
+		ALOGE("%s: Invalid arg", __func__);
+		goto error;
+	}
+	num_slots = get_number_slots(module);
+	if ((num_slots < 1) || (slot > num_slots - 1)) {
+		ALOGE("%s: Unable to get num slots/Invalid slot value",
+				__func__);
+		goto error;
+	}
+        current_slot = get_current_slot(module);
+	if (current_slot == slot) {
+		//Nothing to do here. Just return
+		return 0;
+	}
+	for (i=0; i < ARRAY_SIZE(ptn_list); i++) {
+		//XBL is handled differrently for ufs devices
+		if (is_ufs && !strncmp(ptn_list[i], PTN_XBL, strlen(PTN_XBL)))
+				continue;
+		memset(buf, '\0', sizeof(buf));
+		//Check if A/B versions of this ptn exist
+		snprintf(buf, sizeof(buf) - 1,
+                                        "%s/%s%s",
+                                        BOOT_DEV_DIR,
+                                        ptn_list[i],
+					AB_SLOT_A_SUFFIX
+					);
+		if (stat(buf, &st)) {
+			//partition does not have _a version
+			continue;
+		}
+		memset(buf, '\0', sizeof(buf));
+		snprintf(buf, sizeof(buf) - 1,
+                                        "%s/%s%s",
+                                        BOOT_DEV_DIR,
+                                        ptn_list[i],
+					AB_SLOT_B_SUFFIX
+					);
+		if (stat(buf, &st)) {
+			//partition does not have _a version
+			continue;
+		}
+		disk = gpt_disk_alloc();
+		if (!disk)
+			goto error;
+		memset(slotA, 0, sizeof(slotA));
+		memset(slotB, 0, sizeof(slotB));
+		snprintf(slotA, sizeof(slotA) - 1, "%s%s",
+				ptn_list[i],
+				AB_SLOT_A_SUFFIX);
+		snprintf(slotB, sizeof(slotB) - 1,"%s%s",
+				ptn_list[i],
+				AB_SLOT_B_SUFFIX);
+		//It is assumed that both the A and B slots reside on the
+		//same physical disk
+		if (gpt_disk_get_disk_info(slotA, disk))
+			goto error;
+		//Get partition entry for slot A from primary table
+		pentryA = gpt_disk_get_pentry(disk, slotA, PRIMARY_GPT);
+		//Get partition entry for slot A from backup table
+		pentryA_bak = gpt_disk_get_pentry(disk, slotA, SECONDARY_GPT);
+		//Get partition entry for slot B from primary table
+		pentryB = gpt_disk_get_pentry(disk, slotB, PRIMARY_GPT);
+		//Get partition entry for slot B from backup table
+		pentryB_bak = gpt_disk_get_pentry(disk, slotB, SECONDARY_GPT);
+		if ( !pentryA || !pentryA_bak || !pentryB || !pentryB_bak) {
+			//Something has gone wrong here.We know that we have
+			//_a and _b versions of this partition due to the
+			//check at the start of the loop so none of these
+			//should be NULL.
+			ALOGE("Slot pentries for %s not found.",
+					ptn_list[i]);
+			goto error;
+		}
+		memset(active_guid, '\0', sizeof(active_guid));
+		memset(inactive_guid, '\0', sizeof(inactive_guid));
+		if (get_partition_attribute(slotA, ATTR_SLOT_ACTIVE) == 1) {
+			//A is the current active slot
+			memcpy((void*)active_guid,
+					(const void*)pentryA,
+					TYPE_GUID_SIZE);
+			memcpy((void*)inactive_guid,
+					(const void*)pentryB,
+					TYPE_GUID_SIZE);
+
+		} else if (get_partition_attribute(slotB,
+					ATTR_SLOT_ACTIVE) == 1) {
+			//B is the current active slot
+			memcpy((void*)active_guid,
+					(const void*)pentryB,
+					TYPE_GUID_SIZE);
+			memcpy((void*)inactive_guid,
+					(const void*)pentryA,
+					TYPE_GUID_SIZE);
+		} else {
+			ALOGE("Both A & B are inactive..Aborting");
+			goto error;
+		}
+		if (!strncmp(slot_suffix_arr[slot], AB_SLOT_A_SUFFIX,
+					strlen(AB_SLOT_A_SUFFIX))){
+			//Mark A as active in primary table
+			memcpy(pentryA, active_guid, TYPE_GUID_SIZE);
+			slot_info = pentryA + AB_FLAG_OFFSET;
+			*slot_info = AB_SLOT_ACTIVE_VAL;
+
+			//Mark A as active in backup table
+			memcpy(pentryA_bak, active_guid, TYPE_GUID_SIZE);
+			slot_info = pentryA_bak + AB_FLAG_OFFSET;
+			*slot_info = AB_SLOT_ACTIVE_VAL;
+
+			//Mark B as inactive in primary table
+			memcpy(pentryB, inactive_guid, TYPE_GUID_SIZE);
+			slot_info = pentryB + AB_FLAG_OFFSET;
+			*slot_info = *(slot_info) &
+				~AB_PARTITION_ATTR_SLOT_ACTIVE;
+
+			//Mark B as inactive in backup table
+			memcpy(pentryB_bak, inactive_guid, TYPE_GUID_SIZE);
+			slot_info = pentryB_bak + AB_FLAG_OFFSET;
+			*slot_info = *(slot_info) &
+				~AB_PARTITION_ATTR_SLOT_ACTIVE;
+		} else if (!strncmp(slot_suffix_arr[slot], AB_SLOT_B_SUFFIX,
+					strlen(AB_SLOT_B_SUFFIX))){
+			//Mark B as active in primary table
+			memcpy(pentryB, active_guid, TYPE_GUID_SIZE);
+			slot_info = pentryB + AB_FLAG_OFFSET;
+			*slot_info = AB_SLOT_ACTIVE_VAL;
+
+			//Mark B as active in backup table
+			memcpy(pentryB_bak, active_guid, TYPE_GUID_SIZE);
+			slot_info = pentryB_bak + AB_FLAG_OFFSET;
+			*slot_info = AB_SLOT_ACTIVE_VAL;
+
+			//Mark A as inavtive in primary table
+			memcpy(pentryA, inactive_guid, TYPE_GUID_SIZE);
+			slot_info = pentryA + AB_FLAG_OFFSET;
+			*slot_info = *(slot_info) &
+				~AB_PARTITION_ATTR_SLOT_ACTIVE;
+
+			//Mark A as inactive in backup table
+			memcpy(pentryA_bak, inactive_guid, TYPE_GUID_SIZE);
+			slot_info = pentryA_bak + AB_FLAG_OFFSET;
+			*slot_info = *(slot_info) &
+				~AB_PARTITION_ATTR_SLOT_ACTIVE;
+		} else {
+			//Something has gone terribly terribly wrong
+			ALOGE("%s: Unknown slot suffix!", __func__);
+			goto error;
+		}
+		if (gpt_disk_update_crc(disk) != 0) {
+			ALOGE("%s: Failed to update gpt_disk crc", __func__);
+			goto error;
+		}
+		if (gpt_disk_commit(disk) != 0) {
+			ALOGE("%s: Failed to commit disk info", __func__);
+			goto error;
+		}
+		gpt_disk_free(disk);
+		disk = NULL;
+	}
+	if (is_ufs) {
+		if (!strncmp(slot_suffix_arr[slot], AB_SLOT_A_SUFFIX,
+					strlen(AB_SLOT_A_SUFFIX))){
+			//Set xbl_a as the boot lun
+			rc = gpt_utils_set_xbl_boot_partition(NORMAL_BOOT);
+		} else if (!strncmp(slot_suffix_arr[slot], AB_SLOT_B_SUFFIX,
+					strlen(AB_SLOT_B_SUFFIX))){
+			//Set xbl_b as the boot lun
+			rc = gpt_utils_set_xbl_boot_partition(BACKUP_BOOT);
+		} else {
+			//Something has gone terribly terribly wrong
+			ALOGE("%s: Unknown slot suffix!", __func__);
+			goto error;
+		}
+		if (rc) {
+			ALOGE("%s: Failed to switch xbl boot partition",
+					__func__);
+			goto error;
+		}
+	}
+	return 0;
+error:
+	if (disk)
+		gpt_disk_free(disk);
+	return -1;
+}
+
+int set_slot_as_unbootable(struct boot_control_module *module, unsigned slot)
+{
+	unsigned num_slots = 0;
+	if (!module) {
+		ALOGE("%s: Invalid argument", __func__);
+		goto error;
+	}
+	num_slots = get_number_slots(module);
+	if (num_slots < 1 || slot > num_slots - 1) {
+		ALOGE("%s: Unable to get num_slots/Invalid slot value",
+				__func__);
+		goto error;
+	}
+	if (update_slot_attribute(slot_suffix_arr[slot],
+				ATTR_UNBOOTABLE)) {
+		goto error;
+	}
+	return 0;
+error:
+	ALOGE("%s: Failed to mark slot unbootable", __func__);
+	return -1;
+}
+
+int is_slot_bootable(struct boot_control_module *module, unsigned slot)
+{
+	unsigned num_slots = 0;
+	int attr = 0;
+	char bootPartition[MAX_GPT_NAME_SIZE + 1] = {0};
+	if (!module) {
+		ALOGE("%s: Invalid argument", __func__);
+		goto error;
+	}
+	num_slots = get_number_slots(module);
+	if (num_slots < 1 || slot > num_slots - 1) {
+		ALOGE("%s: Unable to get num_slots/Invalid slot value",
+				__func__);
+		goto error;
+	}
+	snprintf(bootPartition,
+			sizeof(bootPartition) - 1, "boot%s",
+			slot_suffix_arr[slot]);
+	attr = get_partition_attribute(bootPartition, ATTR_UNBOOTABLE);
+	if (attr >= 0)
+		return !attr;
+error:
+	return -1;
+}
+
+int is_slot_marked_successful(struct boot_control_module *module, unsigned slot)
+{
+	unsigned num_slots = 0;
+	int attr = 0;
+	char bootPartition[MAX_GPT_NAME_SIZE + 1] = {0};
+	if (!module) {
+		ALOGE("%s: Invalid argument", __func__);
+		goto error;
+	}
+	num_slots = get_number_slots(module);
+	if (num_slots < 1 || slot > num_slots - 1) {
+		ALOGE("%s: Unable to get num_slots/Invalid slot value",
+				__func__);
+		goto error;
+	}
+	snprintf(bootPartition,
+			sizeof(bootPartition) - 1,
+			"boot%s", slot_suffix_arr[slot]);
+	attr = get_partition_attribute(bootPartition, ATTR_BOOT_SUCCESSFUL);
+	if (attr >= 0)
+		return attr;
+error:
+	return -1;
+}
+
+static hw_module_methods_t boot_control_module_methods = {
+	.open = NULL,
+};
+
+boot_control_module_t HAL_MODULE_INFO_SYM = {
+	.common = {
+		.tag = HARDWARE_MODULE_TAG,
+		.module_api_version = 1,
+		.hal_api_version = 0,
+		.id = BOOT_CONTROL_HARDWARE_MODULE_ID,
+		.name = "Boot control HAL",
+		.author = "Code Aurora Forum",
+		.methods = &boot_control_module_methods,
+	},
+	.init = boot_control_init,
+	.getNumberSlots = get_number_slots,
+	.getCurrentSlot = get_current_slot,
+	.markBootSuccessful = mark_boot_successful,
+	.setActiveBootSlot = set_active_boot_slot,
+	.setSlotAsUnbootable = set_slot_as_unbootable,
+	.isSlotBootable = is_slot_bootable,
+	.getSuffix = get_suffix,
+	.isSlotMarkedSuccessful = is_slot_marked_successful,
+};