Add submodule dependency filesHEADmaster

Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec

1 files changed, 1129 insertions, 0 deletions

diff --git a/roms/u-boot/disk/part_efi.c b/roms/u-boot/disk/part_efi.c
new file mode 100644
index 000000000..0fb7ff0b6
--- /dev/null
+++ b/roms/u-boot/disk/part_efi.c
@@ -0,0 +1,1129 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2008 RuggedCom, Inc.
+ * Richard Retanubun <RichardRetanubun@RuggedCom.com>
+ */
+
+/*
+ * NOTE:
+ *   when CONFIG_SYS_64BIT_LBA is not defined, lbaint_t is 32 bits; this
+ *   limits the maximum size of addressable storage to < 2 tebibytes
+ */
+#include <common.h>
+#include <blk.h>
+#include <log.h>
+#include <part.h>
+#include <uuid.h>
+#include <asm/cache.h>
+#include <asm/global_data.h>
+#include <asm/unaligned.h>
+#include <command.h>
+#include <fdtdec.h>
+#include <ide.h>
+#include <malloc.h>
+#include <memalign.h>
+#include <part_efi.h>
+#include <linux/compiler.h>
+#include <linux/ctype.h>
+#include <u-boot/crc.h>
+
+DECLARE_GLOBAL_DATA_PTR;
+
+/*
+ * GUID for basic data partions.
+ */
+static const efi_guid_t partition_basic_data_guid = PARTITION_BASIC_DATA_GUID;
+
+#ifdef CONFIG_HAVE_BLOCK_DEVICE
+/**
+ * efi_crc32() - EFI version of crc32 function
+ * @buf: buffer to calculate crc32 of
+ * @len - length of buf
+ *
+ * Description: Returns EFI-style CRC32 value for @buf
+ */
+static inline u32 efi_crc32(const void *buf, u32 len)
+{
+	return crc32(0, buf, len);
+}
+
+/*
+ * Private function prototypes
+ */
+
+static int pmbr_part_valid(struct partition *part);
+static int is_pmbr_valid(legacy_mbr * mbr);
+static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba,
+				gpt_header *pgpt_head, gpt_entry **pgpt_pte);
+static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc,
+					 gpt_header *pgpt_head);
+static int is_pte_valid(gpt_entry * pte);
+static int find_valid_gpt(struct blk_desc *dev_desc, gpt_header *gpt_head,
+			  gpt_entry **pgpt_pte);
+
+static char *print_efiname(gpt_entry *pte)
+{
+	static char name[PARTNAME_SZ + 1];
+	int i;
+	for (i = 0; i < PARTNAME_SZ; i++) {
+		u8 c;
+		c = pte->partition_name[i] & 0xff;
+		c = (c && !isprint(c)) ? '.' : c;
+		name[i] = c;
+	}
+	name[PARTNAME_SZ] = 0;
+	return name;
+}
+
+static const efi_guid_t system_guid = PARTITION_SYSTEM_GUID;
+
+static int get_bootable(gpt_entry *p)
+{
+	int ret = 0;
+
+	if (!memcmp(&p->partition_type_guid, &system_guid, sizeof(efi_guid_t)))
+		ret |=  PART_EFI_SYSTEM_PARTITION;
+	if (p->attributes.fields.legacy_bios_bootable)
+		ret |=  PART_BOOTABLE;
+	return ret;
+}
+
+static int validate_gpt_header(gpt_header *gpt_h, lbaint_t lba,
+		lbaint_t lastlba)
+{
+	uint32_t crc32_backup = 0;
+	uint32_t calc_crc32;
+
+	/* Check the GPT header signature */
+	if (le64_to_cpu(gpt_h->signature) != GPT_HEADER_SIGNATURE_UBOOT) {
+		printf("%s signature is wrong: 0x%llX != 0x%llX\n",
+		       "GUID Partition Table Header",
+		       le64_to_cpu(gpt_h->signature),
+		       GPT_HEADER_SIGNATURE_UBOOT);
+		return -1;
+	}
+
+	/* Check the GUID Partition Table CRC */
+	memcpy(&crc32_backup, &gpt_h->header_crc32, sizeof(crc32_backup));
+	memset(&gpt_h->header_crc32, 0, sizeof(gpt_h->header_crc32));
+
+	calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
+		le32_to_cpu(gpt_h->header_size));
+
+	memcpy(&gpt_h->header_crc32, &crc32_backup, sizeof(crc32_backup));
+
+	if (calc_crc32 != le32_to_cpu(crc32_backup)) {
+		printf("%s CRC is wrong: 0x%x != 0x%x\n",
+		       "GUID Partition Table Header",
+		       le32_to_cpu(crc32_backup), calc_crc32);
+		return -1;
+	}
+
+	/*
+	 * Check that the my_lba entry points to the LBA that contains the GPT
+	 */
+	if (le64_to_cpu(gpt_h->my_lba) != lba) {
+		printf("GPT: my_lba incorrect: %llX != " LBAF "\n",
+		       le64_to_cpu(gpt_h->my_lba),
+		       lba);
+		return -1;
+	}
+
+	/*
+	 * Check that the first_usable_lba and that the last_usable_lba are
+	 * within the disk.
+	 */
+	if (le64_to_cpu(gpt_h->first_usable_lba) > lastlba) {
+		printf("GPT: first_usable_lba incorrect: %llX > " LBAF "\n",
+		       le64_to_cpu(gpt_h->first_usable_lba), lastlba);
+		return -1;
+	}
+	if (le64_to_cpu(gpt_h->last_usable_lba) > lastlba) {
+		printf("GPT: last_usable_lba incorrect: %llX > " LBAF "\n",
+		       le64_to_cpu(gpt_h->last_usable_lba), lastlba);
+		return -1;
+	}
+
+	debug("GPT: first_usable_lba: %llX last_usable_lba: %llX last lba: "
+	      LBAF "\n", le64_to_cpu(gpt_h->first_usable_lba),
+	      le64_to_cpu(gpt_h->last_usable_lba), lastlba);
+
+	return 0;
+}
+
+static int validate_gpt_entries(gpt_header *gpt_h, gpt_entry *gpt_e)
+{
+	uint32_t calc_crc32;
+
+	/* Check the GUID Partition Table Entry Array CRC */
+	calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
+		le32_to_cpu(gpt_h->num_partition_entries) *
+		le32_to_cpu(gpt_h->sizeof_partition_entry));
+
+	if (calc_crc32 != le32_to_cpu(gpt_h->partition_entry_array_crc32)) {
+		printf("%s: 0x%x != 0x%x\n",
+		       "GUID Partition Table Entry Array CRC is wrong",
+		       le32_to_cpu(gpt_h->partition_entry_array_crc32),
+		       calc_crc32);
+		return -1;
+	}
+
+	return 0;
+}
+
+static void prepare_backup_gpt_header(gpt_header *gpt_h)
+{
+	uint32_t calc_crc32;
+	uint64_t val;
+
+	/* recalculate the values for the Backup GPT Header */
+	val = le64_to_cpu(gpt_h->my_lba);
+	gpt_h->my_lba = gpt_h->alternate_lba;
+	gpt_h->alternate_lba = cpu_to_le64(val);
+	gpt_h->partition_entry_lba =
+			cpu_to_le64(le64_to_cpu(gpt_h->last_usable_lba) + 1);
+	gpt_h->header_crc32 = 0;
+
+	calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
+			       le32_to_cpu(gpt_h->header_size));
+	gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
+}
+
+#if CONFIG_IS_ENABLED(EFI_PARTITION)
+/*
+ * Public Functions (include/part.h)
+ */
+
+/*
+ * UUID is displayed as 32 hexadecimal digits, in 5 groups,
+ * separated by hyphens, in the form 8-4-4-4-12 for a total of 36 characters
+ */
+int get_disk_guid(struct blk_desc * dev_desc, char *guid)
+{
+	ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
+	gpt_entry *gpt_pte = NULL;
+	unsigned char *guid_bin;
+
+	/* This function validates AND fills in the GPT header and PTE */
+	if (find_valid_gpt(dev_desc, gpt_head, &gpt_pte) != 1)
+		return -EINVAL;
+
+	guid_bin = gpt_head->disk_guid.b;
+	uuid_bin_to_str(guid_bin, guid, UUID_STR_FORMAT_GUID);
+
+	/* Remember to free pte */
+	free(gpt_pte);
+	return 0;
+}
+
+void part_print_efi(struct blk_desc *dev_desc)
+{
+	ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
+	gpt_entry *gpt_pte = NULL;
+	int i = 0;
+	char uuid[UUID_STR_LEN + 1];
+	unsigned char *uuid_bin;
+
+	/* This function validates AND fills in the GPT header and PTE */
+	if (find_valid_gpt(dev_desc, gpt_head, &gpt_pte) != 1)
+		return;
+
+	debug("%s: gpt-entry at %p\n", __func__, gpt_pte);
+
+	printf("Part\tStart LBA\tEnd LBA\t\tName\n");
+	printf("\tAttributes\n");
+	printf("\tType GUID\n");
+	printf("\tPartition GUID\n");
+
+	for (i = 0; i < le32_to_cpu(gpt_head->num_partition_entries); i++) {
+		/* Stop at the first non valid PTE */
+		if (!is_pte_valid(&gpt_pte[i]))
+			break;
+
+		printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i + 1),
+			le64_to_cpu(gpt_pte[i].starting_lba),
+			le64_to_cpu(gpt_pte[i].ending_lba),
+			print_efiname(&gpt_pte[i]));
+		printf("\tattrs:\t0x%016llx\n", gpt_pte[i].attributes.raw);
+		uuid_bin = (unsigned char *)gpt_pte[i].partition_type_guid.b;
+		uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
+		printf("\ttype:\t%s\n", uuid);
+		if (CONFIG_IS_ENABLED(PARTITION_TYPE_GUID)) {
+			const char *type = uuid_guid_get_str(uuid_bin);
+			if (type)
+				printf("\ttype:\t%s\n", type);
+		}
+		uuid_bin = (unsigned char *)gpt_pte[i].unique_partition_guid.b;
+		uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
+		printf("\tguid:\t%s\n", uuid);
+	}
+
+	/* Remember to free pte */
+	free(gpt_pte);
+	return;
+}
+
+int part_get_info_efi(struct blk_desc *dev_desc, int part,
+		      struct disk_partition *info)
+{
+	ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
+	gpt_entry *gpt_pte = NULL;
+
+	/* "part" argument must be at least 1 */
+	if (part < 1) {
+		printf("%s: Invalid Argument(s)\n", __func__);
+		return -1;
+	}
+
+	/* This function validates AND fills in the GPT header and PTE */
+	if (find_valid_gpt(dev_desc, gpt_head, &gpt_pte) != 1)
+		return -1;
+
+	if (part > le32_to_cpu(gpt_head->num_partition_entries) ||
+	    !is_pte_valid(&gpt_pte[part - 1])) {
+		debug("%s: *** ERROR: Invalid partition number %d ***\n",
+			__func__, part);
+		free(gpt_pte);
+		return -1;
+	}
+
+	/* The 'lbaint_t' casting may limit the maximum disk size to 2 TB */
+	info->start = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].starting_lba);
+	/* The ending LBA is inclusive, to calculate size, add 1 to it */
+	info->size = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1
+		     - info->start;
+	info->blksz = dev_desc->blksz;
+
+	snprintf((char *)info->name, sizeof(info->name), "%s",
+		 print_efiname(&gpt_pte[part - 1]));
+	strcpy((char *)info->type, "U-Boot");
+	info->bootable = get_bootable(&gpt_pte[part - 1]);
+#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
+	uuid_bin_to_str(gpt_pte[part - 1].unique_partition_guid.b, info->uuid,
+			UUID_STR_FORMAT_GUID);
+#endif
+#ifdef CONFIG_PARTITION_TYPE_GUID
+	uuid_bin_to_str(gpt_pte[part - 1].partition_type_guid.b,
+			info->type_guid, UUID_STR_FORMAT_GUID);
+#endif
+
+	debug("%s: start 0x" LBAF ", size 0x" LBAF ", name %s\n", __func__,
+	      info->start, info->size, info->name);
+
+	/* Remember to free pte */
+	free(gpt_pte);
+	return 0;
+}
+
+static int part_test_efi(struct blk_desc *dev_desc)
+{
+	ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, legacymbr, 1, dev_desc->blksz);
+
+	/* Read legacy MBR from block 0 and validate it */
+	if ((blk_dread(dev_desc, 0, 1, (ulong *)legacymbr) != 1)
+		|| (is_pmbr_valid(legacymbr) != 1)) {
+		return -1;
+	}
+	return 0;
+}
+
+/**
+ * set_protective_mbr(): Set the EFI protective MBR
+ * @param dev_desc - block device descriptor
+ *
+ * @return - zero on success, otherwise error
+ */
+static int set_protective_mbr(struct blk_desc *dev_desc)
+{
+	/* Setup the Protective MBR */
+	ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, p_mbr, 1, dev_desc->blksz);
+	if (p_mbr == NULL) {
+		printf("%s: calloc failed!\n", __func__);
+		return -1;
+	}
+
+	/* Read MBR to backup boot code if it exists */
+	if (blk_dread(dev_desc, 0, 1, p_mbr) != 1) {
+		pr_err("** Can't read from device %d **\n", dev_desc->devnum);
+		return -1;
+	}
+
+	/* Clear all data in MBR except of backed up boot code */
+	memset((char *)p_mbr + MSDOS_MBR_BOOT_CODE_SIZE, 0, sizeof(*p_mbr) -
+			MSDOS_MBR_BOOT_CODE_SIZE);
+
+	/* Append signature */
+	p_mbr->signature = MSDOS_MBR_SIGNATURE;
+	p_mbr->partition_record[0].sys_ind = EFI_PMBR_OSTYPE_EFI_GPT;
+	p_mbr->partition_record[0].start_sect = 1;
+	p_mbr->partition_record[0].nr_sects = (u32) dev_desc->lba - 1;
+
+	/* Write MBR sector to the MMC device */
+	if (blk_dwrite(dev_desc, 0, 1, p_mbr) != 1) {
+		printf("** Can't write to device %d **\n",
+			dev_desc->devnum);
+		return -1;
+	}
+
+	return 0;
+}
+
+int write_gpt_table(struct blk_desc *dev_desc,
+		gpt_header *gpt_h, gpt_entry *gpt_e)
+{
+	const int pte_blk_cnt = BLOCK_CNT((gpt_h->num_partition_entries
+					   * sizeof(gpt_entry)), dev_desc);
+	u32 calc_crc32;
+
+	debug("max lba: %x\n", (u32) dev_desc->lba);
+	/* Setup the Protective MBR */
+	if (set_protective_mbr(dev_desc) < 0)
+		goto err;
+
+	/* Generate CRC for the Primary GPT Header */
+	calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
+			      le32_to_cpu(gpt_h->num_partition_entries) *
+			      le32_to_cpu(gpt_h->sizeof_partition_entry));
+	gpt_h->partition_entry_array_crc32 = cpu_to_le32(calc_crc32);
+
+	calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
+			      le32_to_cpu(gpt_h->header_size));
+	gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
+
+	/* Write the First GPT to the block right after the Legacy MBR */
+	if (blk_dwrite(dev_desc, 1, 1, gpt_h) != 1)
+		goto err;
+
+	if (blk_dwrite(dev_desc, le64_to_cpu(gpt_h->partition_entry_lba),
+		       pte_blk_cnt, gpt_e) != pte_blk_cnt)
+		goto err;
+
+	prepare_backup_gpt_header(gpt_h);
+
+	if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->last_usable_lba)
+		       + 1, pte_blk_cnt, gpt_e) != pte_blk_cnt)
+		goto err;
+
+	if (blk_dwrite(dev_desc, (lbaint_t)le64_to_cpu(gpt_h->my_lba), 1,
+		       gpt_h) != 1)
+		goto err;
+
+	debug("GPT successfully written to block device!\n");
+	return 0;
+
+ err:
+	printf("** Can't write to device %d **\n", dev_desc->devnum);
+	return -1;
+}
+
+int gpt_fill_pte(struct blk_desc *dev_desc,
+		 gpt_header *gpt_h, gpt_entry *gpt_e,
+		 struct disk_partition *partitions, int parts)
+{
+	lbaint_t offset = (lbaint_t)le64_to_cpu(gpt_h->first_usable_lba);
+	lbaint_t last_usable_lba = (lbaint_t)
+			le64_to_cpu(gpt_h->last_usable_lba);
+	int i, k;
+	size_t efiname_len, dosname_len;
+#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
+	char *str_uuid;
+	unsigned char *bin_uuid;
+#endif
+#ifdef CONFIG_PARTITION_TYPE_GUID
+	char *str_type_guid;
+	unsigned char *bin_type_guid;
+#endif
+	size_t hdr_start = gpt_h->my_lba;
+	size_t hdr_end = hdr_start + 1;
+
+	size_t pte_start = gpt_h->partition_entry_lba;
+	size_t pte_end = pte_start +
+		gpt_h->num_partition_entries * gpt_h->sizeof_partition_entry /
+		dev_desc->blksz;
+
+	for (i = 0; i < parts; i++) {
+		/* partition starting lba */
+		lbaint_t start = partitions[i].start;
+		lbaint_t size = partitions[i].size;
+
+		if (start) {
+			offset = start + size;
+		} else {
+			start = offset;
+			offset += size;
+		}
+
+		/*
+		 * If our partition overlaps with either the GPT
+		 * header, or the partition entry, reject it.
+		 */
+		if (((start < hdr_end && hdr_start < (start + size)) ||
+		     (start < pte_end && pte_start < (start + size)))) {
+			printf("Partition overlap\n");
+			return -1;
+		}
+
+		gpt_e[i].starting_lba = cpu_to_le64(start);
+
+		if (offset > (last_usable_lba + 1)) {
+			printf("Partitions layout exceds disk size\n");
+			return -1;
+		}
+		/* partition ending lba */
+		if ((i == parts - 1) && (size == 0))
+			/* extend the last partition to maximuim */
+			gpt_e[i].ending_lba = gpt_h->last_usable_lba;
+		else
+			gpt_e[i].ending_lba = cpu_to_le64(offset - 1);
+
+#ifdef CONFIG_PARTITION_TYPE_GUID
+		str_type_guid = partitions[i].type_guid;
+		bin_type_guid = gpt_e[i].partition_type_guid.b;
+		if (strlen(str_type_guid)) {
+			if (uuid_str_to_bin(str_type_guid, bin_type_guid,
+					    UUID_STR_FORMAT_GUID)) {
+				printf("Partition no. %d: invalid type guid: %s\n",
+				       i, str_type_guid);
+				return -1;
+			}
+		} else {
+			/* default partition type GUID */
+			memcpy(bin_type_guid,
+			       &partition_basic_data_guid, 16);
+		}
+#else
+		/* partition type GUID */
+		memcpy(gpt_e[i].partition_type_guid.b,
+			&partition_basic_data_guid, 16);
+#endif
+
+#if CONFIG_IS_ENABLED(PARTITION_UUIDS)
+		str_uuid = partitions[i].uuid;
+		bin_uuid = gpt_e[i].unique_partition_guid.b;
+
+		if (uuid_str_to_bin(str_uuid, bin_uuid, UUID_STR_FORMAT_GUID)) {
+			printf("Partition no. %d: invalid guid: %s\n",
+				i, str_uuid);
+			return -1;
+		}
+#endif
+
+		/* partition attributes */
+		memset(&gpt_e[i].attributes, 0,
+		       sizeof(gpt_entry_attributes));
+
+		if (partitions[i].bootable & PART_BOOTABLE)
+			gpt_e[i].attributes.fields.legacy_bios_bootable = 1;
+
+		/* partition name */
+		efiname_len = sizeof(gpt_e[i].partition_name)
+			/ sizeof(efi_char16_t);
+		dosname_len = sizeof(partitions[i].name);
+
+		memset(gpt_e[i].partition_name, 0,
+		       sizeof(gpt_e[i].partition_name));
+
+		for (k = 0; k < min(dosname_len, efiname_len); k++)
+			gpt_e[i].partition_name[k] =
+				(efi_char16_t)(partitions[i].name[k]);
+
+		debug("%s: name: %s offset[%d]: 0x" LBAF
+		      " size[%d]: 0x" LBAF "\n",
+		      __func__, partitions[i].name, i,
+		      offset, i, size);
+	}
+
+	return 0;
+}
+
+static uint32_t partition_entries_offset(struct blk_desc *dev_desc)
+{
+	uint32_t offset_blks = 2;
+	uint32_t __maybe_unused offset_bytes;
+	int __maybe_unused config_offset;
+
+#if defined(CONFIG_EFI_PARTITION_ENTRIES_OFF)
+	/*
+	 * Some architectures require their SPL loader at a fixed
+	 * address within the first 16KB of the disk.  To avoid an
+	 * overlap with the partition entries of the EFI partition
+	 * table, the first safe offset (in bytes, from the start of
+	 * the disk) for the entries can be set in
+	 * CONFIG_EFI_PARTITION_ENTRIES_OFF.
+	 */
+	offset_bytes =
+		PAD_TO_BLOCKSIZE(CONFIG_EFI_PARTITION_ENTRIES_OFF, dev_desc);
+	offset_blks = offset_bytes / dev_desc->blksz;
+#endif
+
+#if defined(CONFIG_OF_CONTROL)
+	/*
+	 * Allow the offset of the first partition entires (in bytes
+	 * from the start of the device) to be specified as a property
+	 * of the device tree '/config' node.
+	 */
+	config_offset = fdtdec_get_config_int(gd->fdt_blob,
+					      "u-boot,efi-partition-entries-offset",
+					      -EINVAL);
+	if (config_offset != -EINVAL) {
+		offset_bytes = PAD_TO_BLOCKSIZE(config_offset, dev_desc);
+		offset_blks = offset_bytes / dev_desc->blksz;
+	}
+#endif
+
+	debug("efi: partition entries offset (in blocks): %d\n", offset_blks);
+
+	/*
+	 * The earliest LBA this can be at is LBA#2 (i.e. right behind
+	 * the (protective) MBR and the GPT header.
+	 */
+	if (offset_blks < 2)
+		offset_blks = 2;
+
+	return offset_blks;
+}
+
+int gpt_fill_header(struct blk_desc *dev_desc, gpt_header *gpt_h,
+		char *str_guid, int parts_count)
+{
+	gpt_h->signature = cpu_to_le64(GPT_HEADER_SIGNATURE_UBOOT);
+	gpt_h->revision = cpu_to_le32(GPT_HEADER_REVISION_V1);
+	gpt_h->header_size = cpu_to_le32(sizeof(gpt_header));
+	gpt_h->my_lba = cpu_to_le64(1);
+	gpt_h->alternate_lba = cpu_to_le64(dev_desc->lba - 1);
+	gpt_h->last_usable_lba = cpu_to_le64(dev_desc->lba - 34);
+	gpt_h->partition_entry_lba =
+		cpu_to_le64(partition_entries_offset(dev_desc));
+	gpt_h->first_usable_lba =
+		cpu_to_le64(le64_to_cpu(gpt_h->partition_entry_lba) + 32);
+	gpt_h->num_partition_entries = cpu_to_le32(GPT_ENTRY_NUMBERS);
+	gpt_h->sizeof_partition_entry = cpu_to_le32(sizeof(gpt_entry));
+	gpt_h->header_crc32 = 0;
+	gpt_h->partition_entry_array_crc32 = 0;
+
+	if (uuid_str_to_bin(str_guid, gpt_h->disk_guid.b, UUID_STR_FORMAT_GUID))
+		return -1;
+
+	return 0;
+}
+
+int gpt_restore(struct blk_desc *dev_desc, char *str_disk_guid,
+		struct disk_partition *partitions, int parts_count)
+{
+	gpt_header *gpt_h;
+	gpt_entry *gpt_e;
+	int ret, size;
+
+	size = PAD_TO_BLOCKSIZE(sizeof(gpt_header), dev_desc);
+	gpt_h = malloc_cache_aligned(size);
+	if (gpt_h == NULL) {
+		printf("%s: calloc failed!\n", __func__);
+		return -1;
+	}
+	memset(gpt_h, 0, size);
+
+	size = PAD_TO_BLOCKSIZE(GPT_ENTRY_NUMBERS * sizeof(gpt_entry),
+				dev_desc);
+	gpt_e = malloc_cache_aligned(size);
+	if (gpt_e == NULL) {
+		printf("%s: calloc failed!\n", __func__);
+		free(gpt_h);
+		return -1;
+	}
+	memset(gpt_e, 0, size);
+
+	/* Generate Primary GPT header (LBA1) */
+	ret = gpt_fill_header(dev_desc, gpt_h, str_disk_guid, parts_count);
+	if (ret)
+		goto err;
+
+	/* Generate partition entries */
+	ret = gpt_fill_pte(dev_desc, gpt_h, gpt_e, partitions, parts_count);
+	if (ret)
+		goto err;
+
+	/* Write GPT partition table */
+	ret = write_gpt_table(dev_desc, gpt_h, gpt_e);
+
+err:
+	free(gpt_e);
+	free(gpt_h);
+	return ret;
+}
+
+/**
+ * gpt_convert_efi_name_to_char() - convert u16 string to char string
+ *
+ * TODO: this conversion only supports ANSI characters
+ *
+ * @s:	target buffer
+ * @es:	u16 string to be converted
+ * @n:	size of target buffer
+ */
+static void gpt_convert_efi_name_to_char(char *s, void *es, int n)
+{
+	char *ess = es;
+	int i, j;
+
+	memset(s, '\0', n);
+
+	for (i = 0, j = 0; j < n; i += 2, j++) {
+		s[j] = ess[i];
+		if (!ess[i])
+			return;
+	}
+}
+
+int gpt_verify_headers(struct blk_desc *dev_desc, gpt_header *gpt_head,
+		       gpt_entry **gpt_pte)
+{
+	/*
+	 * This function validates AND
+	 * fills in the GPT header and PTE
+	 */
+	if (is_gpt_valid(dev_desc,
+			 GPT_PRIMARY_PARTITION_TABLE_LBA,
+			 gpt_head, gpt_pte) != 1) {
+		printf("%s: *** ERROR: Invalid GPT ***\n",
+		       __func__);
+		return -1;
+	}
+
+	/* Free pte before allocating again */
+	free(*gpt_pte);
+
+	/*
+	 * Check that the alternate_lba entry points to the last LBA
+	 */
+	if (le64_to_cpu(gpt_head->alternate_lba) != (dev_desc->lba - 1)) {
+		printf("%s: *** ERROR: Misplaced Backup GPT ***\n",
+		       __func__);
+		return -1;
+	}
+
+	if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
+			 gpt_head, gpt_pte) != 1) {
+		printf("%s: *** ERROR: Invalid Backup GPT ***\n",
+		       __func__);
+		return -1;
+	}
+
+	return 0;
+}
+
+int gpt_verify_partitions(struct blk_desc *dev_desc,
+			  struct disk_partition *partitions, int parts,
+			  gpt_header *gpt_head, gpt_entry **gpt_pte)
+{
+	char efi_str[PARTNAME_SZ + 1];
+	u64 gpt_part_size;
+	gpt_entry *gpt_e;
+	int ret, i;
+
+	ret = gpt_verify_headers(dev_desc, gpt_head, gpt_pte);
+	if (ret)
+		return ret;
+
+	gpt_e = *gpt_pte;
+
+	for (i = 0; i < parts; i++) {
+		if (i == gpt_head->num_partition_entries) {
+			pr_err("More partitions than allowed!\n");
+			return -1;
+		}
+
+		/* Check if GPT and ENV partition names match */
+		gpt_convert_efi_name_to_char(efi_str, gpt_e[i].partition_name,
+					     PARTNAME_SZ + 1);
+
+		debug("%s: part: %2d name - GPT: %16s, ENV: %16s ",
+		      __func__, i, efi_str, partitions[i].name);
+
+		if (strncmp(efi_str, (char *)partitions[i].name,
+			    sizeof(partitions->name))) {
+			pr_err("Partition name: %s does not match %s!\n",
+			      efi_str, (char *)partitions[i].name);
+			return -1;
+		}
+
+		/* Check if GPT and ENV sizes match */
+		gpt_part_size = le64_to_cpu(gpt_e[i].ending_lba) -
+			le64_to_cpu(gpt_e[i].starting_lba) + 1;
+		debug("size(LBA) - GPT: %8llu, ENV: %8llu ",
+		      (unsigned long long)gpt_part_size,
+		      (unsigned long long)partitions[i].size);
+
+		if (le64_to_cpu(gpt_part_size) != partitions[i].size) {
+			/* We do not check the extend partition size */
+			if ((i == parts - 1) && (partitions[i].size == 0))
+				continue;
+
+			pr_err("Partition %s size: %llu does not match %llu!\n",
+			      efi_str, (unsigned long long)gpt_part_size,
+			      (unsigned long long)partitions[i].size);
+			return -1;
+		}
+
+		/*
+		 * Start address is optional - check only if provided
+		 * in '$partition' variable
+		 */
+		if (!partitions[i].start) {
+			debug("\n");
+			continue;
+		}
+
+		/* Check if GPT and ENV start LBAs match */
+		debug("start LBA - GPT: %8llu, ENV: %8llu\n",
+		      le64_to_cpu(gpt_e[i].starting_lba),
+		      (unsigned long long)partitions[i].start);
+
+		if (le64_to_cpu(gpt_e[i].starting_lba) != partitions[i].start) {
+			pr_err("Partition %s start: %llu does not match %llu!\n",
+			      efi_str, le64_to_cpu(gpt_e[i].starting_lba),
+			      (unsigned long long)partitions[i].start);
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
+int is_valid_gpt_buf(struct blk_desc *dev_desc, void *buf)
+{
+	gpt_header *gpt_h;
+	gpt_entry *gpt_e;
+
+	/* determine start of GPT Header in the buffer */
+	gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA *
+		       dev_desc->blksz);
+	if (validate_gpt_header(gpt_h, GPT_PRIMARY_PARTITION_TABLE_LBA,
+				dev_desc->lba))
+		return -1;
+
+	/* determine start of GPT Entries in the buffer */
+	gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
+		       dev_desc->blksz);
+	if (validate_gpt_entries(gpt_h, gpt_e))
+		return -1;
+
+	return 0;
+}
+
+int write_mbr_and_gpt_partitions(struct blk_desc *dev_desc, void *buf)
+{
+	gpt_header *gpt_h;
+	gpt_entry *gpt_e;
+	int gpt_e_blk_cnt;
+	lbaint_t lba;
+	int cnt;
+
+	if (is_valid_gpt_buf(dev_desc, buf))
+		return -1;
+
+	/* determine start of GPT Header in the buffer */
+	gpt_h = buf + (GPT_PRIMARY_PARTITION_TABLE_LBA *
+		       dev_desc->blksz);
+
+	/* determine start of GPT Entries in the buffer */
+	gpt_e = buf + (le64_to_cpu(gpt_h->partition_entry_lba) *
+		       dev_desc->blksz);
+	gpt_e_blk_cnt = BLOCK_CNT((le32_to_cpu(gpt_h->num_partition_entries) *
+				   le32_to_cpu(gpt_h->sizeof_partition_entry)),
+				  dev_desc);
+
+	/* write MBR */
+	lba = 0;	/* MBR is always at 0 */
+	cnt = 1;	/* MBR (1 block) */
+	if (blk_dwrite(dev_desc, lba, cnt, buf) != cnt) {
+		printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
+		       __func__, "MBR", cnt, lba);
+		return 1;
+	}
+
+	/* write Primary GPT */
+	lba = GPT_PRIMARY_PARTITION_TABLE_LBA;
+	cnt = 1;	/* GPT Header (1 block) */
+	if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) {
+		printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
+		       __func__, "Primary GPT Header", cnt, lba);
+		return 1;
+	}
+
+	lba = le64_to_cpu(gpt_h->partition_entry_lba);
+	cnt = gpt_e_blk_cnt;
+	if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) {
+		printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
+		       __func__, "Primary GPT Entries", cnt, lba);
+		return 1;
+	}
+
+	prepare_backup_gpt_header(gpt_h);
+
+	/* write Backup GPT */
+	lba = le64_to_cpu(gpt_h->partition_entry_lba);
+	cnt = gpt_e_blk_cnt;
+	if (blk_dwrite(dev_desc, lba, cnt, gpt_e) != cnt) {
+		printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
+		       __func__, "Backup GPT Entries", cnt, lba);
+		return 1;
+	}
+
+	lba = le64_to_cpu(gpt_h->my_lba);
+	cnt = 1;	/* GPT Header (1 block) */
+	if (blk_dwrite(dev_desc, lba, cnt, gpt_h) != cnt) {
+		printf("%s: failed writing '%s' (%d blks at 0x" LBAF ")\n",
+		       __func__, "Backup GPT Header", cnt, lba);
+		return 1;
+	}
+
+	/* Update the partition table entries*/
+	part_init(dev_desc);
+
+	return 0;
+}
+#endif
+
+/*
+ * Private functions
+ */
+/*
+ * pmbr_part_valid(): Check for EFI partition signature
+ *
+ * Returns: 1 if EFI GPT partition type is found.
+ */
+static int pmbr_part_valid(struct partition *part)
+{
+	if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
+		get_unaligned_le32(&part->start_sect) == 1UL) {
+		return 1;
+	}
+
+	return 0;
+}
+
+/*
+ * is_pmbr_valid(): test Protective MBR for validity
+ *
+ * Returns: 1 if PMBR is valid, 0 otherwise.
+ * Validity depends on two things:
+ *  1) MSDOS signature is in the last two bytes of the MBR
+ *  2) One partition of type 0xEE is found, checked by pmbr_part_valid()
+ */
+static int is_pmbr_valid(legacy_mbr * mbr)
+{
+	int i = 0;
+
+	if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE)
+		return 0;
+
+	for (i = 0; i < 4; i++) {
+		if (pmbr_part_valid(&mbr->partition_record[i])) {
+			return 1;
+		}
+	}
+	return 0;
+}
+
+/**
+ * is_gpt_valid() - tests one GPT header and PTEs for validity
+ *
+ * lba is the logical block address of the GPT header to test
+ * gpt is a GPT header ptr, filled on return.
+ * ptes is a PTEs ptr, filled on return.
+ *
+ * Description: returns 1 if valid,  0 on error, 2 if ignored header
+ * If valid, returns pointers to PTEs.
+ */
+static int is_gpt_valid(struct blk_desc *dev_desc, u64 lba,
+			gpt_header *pgpt_head, gpt_entry **pgpt_pte)
+{
+	/* Confirm valid arguments prior to allocation. */
+	if (!dev_desc || !pgpt_head) {
+		printf("%s: Invalid Argument(s)\n", __func__);
+		return 0;
+	}
+
+	ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, mbr, 1, dev_desc->blksz);
+
+	/* Read MBR Header from device */
+	if (blk_dread(dev_desc, 0, 1, (ulong *)mbr) != 1) {
+		printf("*** ERROR: Can't read MBR header ***\n");
+		return 0;
+	}
+
+	/* Read GPT Header from device */
+	if (blk_dread(dev_desc, (lbaint_t)lba, 1, pgpt_head) != 1) {
+		printf("*** ERROR: Can't read GPT header ***\n");
+		return 0;
+	}
+
+	/* Invalid but nothing to yell about. */
+	if (le64_to_cpu(pgpt_head->signature) == GPT_HEADER_CHROMEOS_IGNORE) {
+		debug("ChromeOS 'IGNOREME' GPT header found and ignored\n");
+		return 2;
+	}
+
+	if (validate_gpt_header(pgpt_head, (lbaint_t)lba, dev_desc->lba))
+		return 0;
+
+	if (dev_desc->sig_type == SIG_TYPE_NONE) {
+		efi_guid_t empty = {};
+		if (memcmp(&pgpt_head->disk_guid, &empty, sizeof(empty))) {
+			dev_desc->sig_type = SIG_TYPE_GUID;
+			memcpy(&dev_desc->guid_sig, &pgpt_head->disk_guid,
+			      sizeof(empty));
+		} else if (mbr->unique_mbr_signature != 0) {
+			dev_desc->sig_type = SIG_TYPE_MBR;
+			dev_desc->mbr_sig = mbr->unique_mbr_signature;
+		}
+	}
+
+	/* Read and allocate Partition Table Entries */
+	*pgpt_pte = alloc_read_gpt_entries(dev_desc, pgpt_head);
+	if (*pgpt_pte == NULL) {
+		printf("GPT: Failed to allocate memory for PTE\n");
+		return 0;
+	}
+
+	if (validate_gpt_entries(pgpt_head, *pgpt_pte)) {
+		free(*pgpt_pte);
+		return 0;
+	}
+
+	/* We're done, all's well */
+	return 1;
+}
+
+/**
+ * find_valid_gpt() - finds a valid GPT header and PTEs
+ *
+ * gpt is a GPT header ptr, filled on return.
+ * ptes is a PTEs ptr, filled on return.
+ *
+ * Description: returns 1 if found a valid gpt,  0 on error.
+ * If valid, returns pointers to PTEs.
+ */
+static int find_valid_gpt(struct blk_desc *dev_desc, gpt_header *gpt_head,
+			  gpt_entry **pgpt_pte)
+{
+	int r;
+
+	r = is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA, gpt_head,
+			 pgpt_pte);
+
+	if (r != 1) {
+		if (r != 2)
+			printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
+
+		if (is_gpt_valid(dev_desc, (dev_desc->lba - 1), gpt_head,
+				 pgpt_pte) != 1) {
+			printf("%s: *** ERROR: Invalid Backup GPT ***\n",
+			       __func__);
+			return 0;
+		}
+		if (r != 2)
+			printf("%s: ***        Using Backup GPT ***\n",
+			       __func__);
+	}
+	return 1;
+}
+
+/**
+ * alloc_read_gpt_entries(): reads partition entries from disk
+ * @dev_desc
+ * @gpt - GPT header
+ *
+ * Description: Returns ptes on success,  NULL on error.
+ * Allocates space for PTEs based on information found in @gpt.
+ * Notes: remember to free pte when you're done!
+ */
+static gpt_entry *alloc_read_gpt_entries(struct blk_desc *dev_desc,
+					 gpt_header *pgpt_head)
+{
+	size_t count = 0, blk_cnt;
+	lbaint_t blk;
+	gpt_entry *pte = NULL;
+
+	if (!dev_desc || !pgpt_head) {
+		printf("%s: Invalid Argument(s)\n", __func__);
+		return NULL;
+	}
+
+	count = le32_to_cpu(pgpt_head->num_partition_entries) *
+		le32_to_cpu(pgpt_head->sizeof_partition_entry);
+
+	debug("%s: count = %u * %u = %lu\n", __func__,
+	      (u32) le32_to_cpu(pgpt_head->num_partition_entries),
+	      (u32) le32_to_cpu(pgpt_head->sizeof_partition_entry),
+	      (ulong)count);
+
+	/* Allocate memory for PTE, remember to FREE */
+	if (count != 0) {
+		pte = memalign(ARCH_DMA_MINALIGN,
+			       PAD_TO_BLOCKSIZE(count, dev_desc));
+	}
+
+	if (count == 0 || pte == NULL) {
+		printf("%s: ERROR: Can't allocate %#lX bytes for GPT Entries\n",
+		       __func__, (ulong)count);
+		return NULL;
+	}
+
+	/* Read GPT Entries from device */
+	blk = le64_to_cpu(pgpt_head->partition_entry_lba);
+	blk_cnt = BLOCK_CNT(count, dev_desc);
+	if (blk_dread(dev_desc, blk, (lbaint_t)blk_cnt, pte) != blk_cnt) {
+		printf("*** ERROR: Can't read GPT Entries ***\n");
+		free(pte);
+		return NULL;
+	}
+	return pte;
+}
+
+/**
+ * is_pte_valid(): validates a single Partition Table Entry
+ * @gpt_entry - Pointer to a single Partition Table Entry
+ *
+ * Description: returns 1 if valid,  0 on error.
+ */
+static int is_pte_valid(gpt_entry * pte)
+{
+	efi_guid_t unused_guid;
+
+	if (!pte) {
+		printf("%s: Invalid Argument(s)\n", __func__);
+		return 0;
+	}
+
+	/* Only one validation for now:
+	 * The GUID Partition Type != Unused Entry (ALL-ZERO)
+	 */
+	memset(unused_guid.b, 0, sizeof(unused_guid.b));
+
+	if (memcmp(pte->partition_type_guid.b, unused_guid.b,
+		sizeof(unused_guid.b)) == 0) {
+
+		debug("%s: Found an unused PTE GUID at 0x%08X\n", __func__,
+		      (unsigned int)(uintptr_t)pte);
+
+		return 0;
+	} else {
+		return 1;
+	}
+}
+
+/*
+ * Add an 'a_' prefix so it comes before 'dos' in the linker list. We need to
+ * check EFI first, since a DOS partition is often used as a 'protective MBR'
+ * with EFI.
+ */
+U_BOOT_PART_TYPE(a_efi) = {
+	.name		= "EFI",
+	.part_type	= PART_TYPE_EFI,
+	.max_entries	= GPT_ENTRY_NUMBERS,
+	.get_info	= part_get_info_ptr(part_get_info_efi),
+	.print		= part_print_ptr(part_print_efi),
+	.test		= part_test_efi,
+};
+#endif