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![Steve Rae](/assets/img/avatar_default.png)
Add function to find a GPT table entry by name. Tested on little endian ARMv7 and ARMv8 configurations Signed-off-by: Steve Rae <srae@broadcom.com>
691 lines
18 KiB
C
691 lines
18 KiB
C
/*
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* Copyright (C) 2008 RuggedCom, Inc.
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* Richard Retanubun <RichardRetanubun@RuggedCom.com>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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/*
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* NOTE:
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* when CONFIG_SYS_64BIT_LBA is not defined, lbaint_t is 32 bits; this
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* limits the maximum size of addressable storage to < 2 Terra Bytes
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*/
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#include <asm/unaligned.h>
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#include <common.h>
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#include <command.h>
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#include <ide.h>
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#include <malloc.h>
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#include <part_efi.h>
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#include <linux/ctype.h>
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DECLARE_GLOBAL_DATA_PTR;
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#ifdef HAVE_BLOCK_DEVICE
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/**
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* efi_crc32() - EFI version of crc32 function
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* @buf: buffer to calculate crc32 of
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* @len - length of buf
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*
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* Description: Returns EFI-style CRC32 value for @buf
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*/
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static inline u32 efi_crc32(const void *buf, u32 len)
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{
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return crc32(0, buf, len);
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}
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/*
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* Private function prototypes
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*/
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static int pmbr_part_valid(struct partition *part);
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static int is_pmbr_valid(legacy_mbr * mbr);
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static int is_gpt_valid(block_dev_desc_t *dev_desc, u64 lba,
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gpt_header *pgpt_head, gpt_entry **pgpt_pte);
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static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc,
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gpt_header * pgpt_head);
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static int is_pte_valid(gpt_entry * pte);
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static char *print_efiname(gpt_entry *pte)
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{
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static char name[PARTNAME_SZ + 1];
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int i;
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for (i = 0; i < PARTNAME_SZ; i++) {
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u8 c;
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c = pte->partition_name[i] & 0xff;
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c = (c && !isprint(c)) ? '.' : c;
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name[i] = c;
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}
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name[PARTNAME_SZ] = 0;
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return name;
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}
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static efi_guid_t system_guid = PARTITION_SYSTEM_GUID;
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static inline int is_bootable(gpt_entry *p)
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{
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return p->attributes.fields.legacy_bios_bootable ||
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!memcmp(&(p->partition_type_guid), &system_guid,
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sizeof(efi_guid_t));
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}
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#ifdef CONFIG_EFI_PARTITION
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/*
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* Public Functions (include/part.h)
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*/
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void print_part_efi(block_dev_desc_t * dev_desc)
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{
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ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
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gpt_entry *gpt_pte = NULL;
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int i = 0;
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char uuid[37];
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unsigned char *uuid_bin;
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if (!dev_desc) {
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printf("%s: Invalid Argument(s)\n", __func__);
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return;
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}
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/* This function validates AND fills in the GPT header and PTE */
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if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
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gpt_head, &gpt_pte) != 1) {
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printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
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if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
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gpt_head, &gpt_pte) != 1) {
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printf("%s: *** ERROR: Invalid Backup GPT ***\n",
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__func__);
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return;
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} else {
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printf("%s: *** Using Backup GPT ***\n",
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__func__);
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}
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}
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debug("%s: gpt-entry at %p\n", __func__, gpt_pte);
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printf("Part\tStart LBA\tEnd LBA\t\tName\n");
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printf("\tAttributes\n");
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printf("\tType GUID\n");
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printf("\tPartition GUID\n");
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for (i = 0; i < le32_to_cpu(gpt_head->num_partition_entries); i++) {
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/* Stop at the first non valid PTE */
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if (!is_pte_valid(&gpt_pte[i]))
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break;
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printf("%3d\t0x%08llx\t0x%08llx\t\"%s\"\n", (i + 1),
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le64_to_cpu(gpt_pte[i].starting_lba),
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le64_to_cpu(gpt_pte[i].ending_lba),
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print_efiname(&gpt_pte[i]));
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printf("\tattrs:\t0x%016llx\n", gpt_pte[i].attributes.raw);
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uuid_bin = (unsigned char *)gpt_pte[i].partition_type_guid.b;
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uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
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printf("\ttype:\t%s\n", uuid);
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uuid_bin = (unsigned char *)gpt_pte[i].unique_partition_guid.b;
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uuid_bin_to_str(uuid_bin, uuid, UUID_STR_FORMAT_GUID);
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printf("\tguid:\t%s\n", uuid);
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}
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/* Remember to free pte */
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free(gpt_pte);
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return;
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}
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int get_partition_info_efi(block_dev_desc_t * dev_desc, int part,
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disk_partition_t * info)
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{
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ALLOC_CACHE_ALIGN_BUFFER_PAD(gpt_header, gpt_head, 1, dev_desc->blksz);
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gpt_entry *gpt_pte = NULL;
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/* "part" argument must be at least 1 */
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if (!dev_desc || !info || part < 1) {
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printf("%s: Invalid Argument(s)\n", __func__);
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return -1;
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}
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/* This function validates AND fills in the GPT header and PTE */
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if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
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gpt_head, &gpt_pte) != 1) {
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printf("%s: *** ERROR: Invalid GPT ***\n", __func__);
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if (is_gpt_valid(dev_desc, (dev_desc->lba - 1),
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gpt_head, &gpt_pte) != 1) {
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printf("%s: *** ERROR: Invalid Backup GPT ***\n",
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__func__);
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return -1;
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} else {
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printf("%s: *** Using Backup GPT ***\n",
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__func__);
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}
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}
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if (part > le32_to_cpu(gpt_head->num_partition_entries) ||
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!is_pte_valid(&gpt_pte[part - 1])) {
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debug("%s: *** ERROR: Invalid partition number %d ***\n",
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__func__, part);
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free(gpt_pte);
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return -1;
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}
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/* The 'lbaint_t' casting may limit the maximum disk size to 2 TB */
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info->start = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].starting_lba);
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/* The ending LBA is inclusive, to calculate size, add 1 to it */
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info->size = (lbaint_t)le64_to_cpu(gpt_pte[part - 1].ending_lba) + 1
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- info->start;
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info->blksz = dev_desc->blksz;
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sprintf((char *)info->name, "%s",
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print_efiname(&gpt_pte[part - 1]));
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sprintf((char *)info->type, "U-Boot");
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info->bootable = is_bootable(&gpt_pte[part - 1]);
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#ifdef CONFIG_PARTITION_UUIDS
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uuid_bin_to_str(gpt_pte[part - 1].unique_partition_guid.b, info->uuid,
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UUID_STR_FORMAT_GUID);
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#endif
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debug("%s: start 0x" LBAF ", size 0x" LBAF ", name %s\n", __func__,
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info->start, info->size, info->name);
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/* Remember to free pte */
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free(gpt_pte);
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return 0;
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}
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int get_partition_info_efi_by_name(block_dev_desc_t *dev_desc,
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const char *name, disk_partition_t *info)
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{
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int ret;
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int i;
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for (i = 1; i < GPT_ENTRY_NUMBERS; i++) {
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ret = get_partition_info_efi(dev_desc, i, info);
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if (ret != 0) {
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/* no more entries in table */
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return -1;
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}
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if (strcmp(name, (const char *)info->name) == 0) {
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/* matched */
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return 0;
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}
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}
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return -2;
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}
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int test_part_efi(block_dev_desc_t * dev_desc)
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{
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ALLOC_CACHE_ALIGN_BUFFER_PAD(legacy_mbr, legacymbr, 1, dev_desc->blksz);
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/* Read legacy MBR from block 0 and validate it */
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if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *)legacymbr) != 1)
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|| (is_pmbr_valid(legacymbr) != 1)) {
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return -1;
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}
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return 0;
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}
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/**
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* set_protective_mbr(): Set the EFI protective MBR
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* @param dev_desc - block device descriptor
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*
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* @return - zero on success, otherwise error
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*/
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static int set_protective_mbr(block_dev_desc_t *dev_desc)
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{
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/* Setup the Protective MBR */
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ALLOC_CACHE_ALIGN_BUFFER(legacy_mbr, p_mbr, 1);
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memset(p_mbr, 0, sizeof(*p_mbr));
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if (p_mbr == NULL) {
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printf("%s: calloc failed!\n", __func__);
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return -1;
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}
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/* Append signature */
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p_mbr->signature = MSDOS_MBR_SIGNATURE;
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p_mbr->partition_record[0].sys_ind = EFI_PMBR_OSTYPE_EFI_GPT;
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p_mbr->partition_record[0].start_sect = 1;
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p_mbr->partition_record[0].nr_sects = (u32) dev_desc->lba;
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/* Write MBR sector to the MMC device */
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if (dev_desc->block_write(dev_desc->dev, 0, 1, p_mbr) != 1) {
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printf("** Can't write to device %d **\n",
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dev_desc->dev);
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return -1;
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}
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return 0;
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}
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int write_gpt_table(block_dev_desc_t *dev_desc,
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gpt_header *gpt_h, gpt_entry *gpt_e)
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{
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const int pte_blk_cnt = BLOCK_CNT((gpt_h->num_partition_entries
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* sizeof(gpt_entry)), dev_desc);
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u32 calc_crc32;
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u64 val;
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debug("max lba: %x\n", (u32) dev_desc->lba);
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/* Setup the Protective MBR */
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if (set_protective_mbr(dev_desc) < 0)
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goto err;
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/* Generate CRC for the Primary GPT Header */
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calc_crc32 = efi_crc32((const unsigned char *)gpt_e,
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le32_to_cpu(gpt_h->num_partition_entries) *
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le32_to_cpu(gpt_h->sizeof_partition_entry));
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gpt_h->partition_entry_array_crc32 = cpu_to_le32(calc_crc32);
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calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
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le32_to_cpu(gpt_h->header_size));
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gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
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/* Write the First GPT to the block right after the Legacy MBR */
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if (dev_desc->block_write(dev_desc->dev, 1, 1, gpt_h) != 1)
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goto err;
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if (dev_desc->block_write(dev_desc->dev, 2, pte_blk_cnt, gpt_e)
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!= pte_blk_cnt)
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goto err;
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/* recalculate the values for the Backup GPT Header */
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val = le64_to_cpu(gpt_h->my_lba);
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gpt_h->my_lba = gpt_h->alternate_lba;
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gpt_h->alternate_lba = cpu_to_le64(val);
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gpt_h->header_crc32 = 0;
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calc_crc32 = efi_crc32((const unsigned char *)gpt_h,
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le32_to_cpu(gpt_h->header_size));
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gpt_h->header_crc32 = cpu_to_le32(calc_crc32);
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if (dev_desc->block_write(dev_desc->dev,
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(lbaint_t)le64_to_cpu(gpt_h->last_usable_lba)
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+ 1,
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pte_blk_cnt, gpt_e) != pte_blk_cnt)
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goto err;
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if (dev_desc->block_write(dev_desc->dev,
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(lbaint_t)le64_to_cpu(gpt_h->my_lba), 1,
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gpt_h) != 1)
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goto err;
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debug("GPT successfully written to block device!\n");
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return 0;
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err:
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printf("** Can't write to device %d **\n", dev_desc->dev);
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return -1;
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}
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int gpt_fill_pte(gpt_header *gpt_h, gpt_entry *gpt_e,
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disk_partition_t *partitions, int parts)
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{
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lbaint_t offset = (lbaint_t)le64_to_cpu(gpt_h->first_usable_lba);
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lbaint_t start;
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lbaint_t last_usable_lba = (lbaint_t)
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le64_to_cpu(gpt_h->last_usable_lba);
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int i, k;
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size_t efiname_len, dosname_len;
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#ifdef CONFIG_PARTITION_UUIDS
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char *str_uuid;
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unsigned char *bin_uuid;
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#endif
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for (i = 0; i < parts; i++) {
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/* partition starting lba */
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start = partitions[i].start;
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if (start && (start < offset)) {
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printf("Partition overlap\n");
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return -1;
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}
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if (start) {
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gpt_e[i].starting_lba = cpu_to_le64(start);
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offset = start + partitions[i].size;
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} else {
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gpt_e[i].starting_lba = cpu_to_le64(offset);
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offset += partitions[i].size;
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}
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if (offset >= last_usable_lba) {
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printf("Partitions layout exceds disk size\n");
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return -1;
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}
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/* partition ending lba */
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if ((i == parts - 1) && (partitions[i].size == 0))
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/* extend the last partition to maximuim */
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gpt_e[i].ending_lba = gpt_h->last_usable_lba;
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else
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gpt_e[i].ending_lba = cpu_to_le64(offset - 1);
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/* partition type GUID */
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memcpy(gpt_e[i].partition_type_guid.b,
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&PARTITION_BASIC_DATA_GUID, 16);
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#ifdef CONFIG_PARTITION_UUIDS
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str_uuid = partitions[i].uuid;
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bin_uuid = gpt_e[i].unique_partition_guid.b;
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if (uuid_str_to_bin(str_uuid, bin_uuid, UUID_STR_FORMAT_STD)) {
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printf("Partition no. %d: invalid guid: %s\n",
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i, str_uuid);
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return -1;
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}
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#endif
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/* partition attributes */
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memset(&gpt_e[i].attributes, 0,
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sizeof(gpt_entry_attributes));
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/* partition name */
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efiname_len = sizeof(gpt_e[i].partition_name)
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/ sizeof(efi_char16_t);
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dosname_len = sizeof(partitions[i].name);
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memset(gpt_e[i].partition_name, 0,
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sizeof(gpt_e[i].partition_name));
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for (k = 0; k < min(dosname_len, efiname_len); k++)
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gpt_e[i].partition_name[k] =
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(efi_char16_t)(partitions[i].name[k]);
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debug("%s: name: %s offset[%d]: 0x" LBAF
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" size[%d]: 0x" LBAF "\n",
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__func__, partitions[i].name, i,
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offset, i, partitions[i].size);
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}
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return 0;
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}
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int gpt_fill_header(block_dev_desc_t *dev_desc, gpt_header *gpt_h,
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char *str_guid, int parts_count)
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{
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gpt_h->signature = cpu_to_le64(GPT_HEADER_SIGNATURE);
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gpt_h->revision = cpu_to_le32(GPT_HEADER_REVISION_V1);
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gpt_h->header_size = cpu_to_le32(sizeof(gpt_header));
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gpt_h->my_lba = cpu_to_le64(1);
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gpt_h->alternate_lba = cpu_to_le64(dev_desc->lba - 1);
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gpt_h->first_usable_lba = cpu_to_le64(34);
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gpt_h->last_usable_lba = cpu_to_le64(dev_desc->lba - 34);
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gpt_h->partition_entry_lba = cpu_to_le64(2);
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gpt_h->num_partition_entries = cpu_to_le32(GPT_ENTRY_NUMBERS);
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gpt_h->sizeof_partition_entry = cpu_to_le32(sizeof(gpt_entry));
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gpt_h->header_crc32 = 0;
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gpt_h->partition_entry_array_crc32 = 0;
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if (uuid_str_to_bin(str_guid, gpt_h->disk_guid.b, UUID_STR_FORMAT_GUID))
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return -1;
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return 0;
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}
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int gpt_restore(block_dev_desc_t *dev_desc, char *str_disk_guid,
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disk_partition_t *partitions, int parts_count)
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{
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int ret;
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gpt_header *gpt_h = calloc(1, PAD_TO_BLOCKSIZE(sizeof(gpt_header),
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dev_desc));
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gpt_entry *gpt_e;
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if (gpt_h == NULL) {
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printf("%s: calloc failed!\n", __func__);
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return -1;
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}
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gpt_e = calloc(1, PAD_TO_BLOCKSIZE(GPT_ENTRY_NUMBERS
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* sizeof(gpt_entry),
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dev_desc));
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if (gpt_e == NULL) {
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printf("%s: calloc failed!\n", __func__);
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free(gpt_h);
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return -1;
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}
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/* Generate Primary GPT header (LBA1) */
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ret = gpt_fill_header(dev_desc, gpt_h, str_disk_guid, parts_count);
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if (ret)
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goto err;
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/* Generate partition entries */
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ret = gpt_fill_pte(gpt_h, gpt_e, partitions, parts_count);
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if (ret)
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goto err;
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/* Write GPT partition table */
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ret = write_gpt_table(dev_desc, gpt_h, gpt_e);
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err:
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free(gpt_e);
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free(gpt_h);
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return ret;
|
|
}
|
|
#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.
|
|
* If valid, returns pointers to PTEs.
|
|
*/
|
|
static int is_gpt_valid(block_dev_desc_t *dev_desc, u64 lba,
|
|
gpt_header *pgpt_head, gpt_entry **pgpt_pte)
|
|
{
|
|
u32 crc32_backup = 0;
|
|
u32 calc_crc32;
|
|
u64 lastlba;
|
|
|
|
if (!dev_desc || !pgpt_head) {
|
|
printf("%s: Invalid Argument(s)\n", __func__);
|
|
return 0;
|
|
}
|
|
|
|
/* Read GPT Header from device */
|
|
if (dev_desc->block_read(dev_desc->dev, (lbaint_t)lba, 1, pgpt_head)
|
|
!= 1) {
|
|
printf("*** ERROR: Can't read GPT header ***\n");
|
|
return 0;
|
|
}
|
|
|
|
/* Check the GPT header signature */
|
|
if (le64_to_cpu(pgpt_head->signature) != GPT_HEADER_SIGNATURE) {
|
|
printf("GUID Partition Table Header signature is wrong:"
|
|
"0x%llX != 0x%llX\n",
|
|
le64_to_cpu(pgpt_head->signature),
|
|
GPT_HEADER_SIGNATURE);
|
|
return 0;
|
|
}
|
|
|
|
/* Check the GUID Partition Table CRC */
|
|
memcpy(&crc32_backup, &pgpt_head->header_crc32, sizeof(crc32_backup));
|
|
memset(&pgpt_head->header_crc32, 0, sizeof(pgpt_head->header_crc32));
|
|
|
|
calc_crc32 = efi_crc32((const unsigned char *)pgpt_head,
|
|
le32_to_cpu(pgpt_head->header_size));
|
|
|
|
memcpy(&pgpt_head->header_crc32, &crc32_backup, sizeof(crc32_backup));
|
|
|
|
if (calc_crc32 != le32_to_cpu(crc32_backup)) {
|
|
printf("GUID Partition Table Header CRC is wrong:"
|
|
"0x%x != 0x%x\n",
|
|
le32_to_cpu(crc32_backup), calc_crc32);
|
|
return 0;
|
|
}
|
|
|
|
/* Check that the my_lba entry points to the LBA that contains the GPT */
|
|
if (le64_to_cpu(pgpt_head->my_lba) != lba) {
|
|
printf("GPT: my_lba incorrect: %llX != %llX\n",
|
|
le64_to_cpu(pgpt_head->my_lba),
|
|
lba);
|
|
return 0;
|
|
}
|
|
|
|
/* Check the first_usable_lba and last_usable_lba are within the disk. */
|
|
lastlba = (u64)dev_desc->lba;
|
|
if (le64_to_cpu(pgpt_head->first_usable_lba) > lastlba) {
|
|
printf("GPT: first_usable_lba incorrect: %llX > %llX\n",
|
|
le64_to_cpu(pgpt_head->first_usable_lba), lastlba);
|
|
return 0;
|
|
}
|
|
if (le64_to_cpu(pgpt_head->last_usable_lba) > lastlba) {
|
|
printf("GPT: last_usable_lba incorrect: %llX > %llX\n",
|
|
le64_to_cpu(pgpt_head->last_usable_lba), lastlba);
|
|
return 0;
|
|
}
|
|
|
|
debug("GPT: first_usable_lba: %llX last_usable_lba %llX last lba %llX\n",
|
|
le64_to_cpu(pgpt_head->first_usable_lba),
|
|
le64_to_cpu(pgpt_head->last_usable_lba), lastlba);
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* Check the GUID Partition Table Entry Array CRC */
|
|
calc_crc32 = efi_crc32((const unsigned char *)*pgpt_pte,
|
|
le32_to_cpu(pgpt_head->num_partition_entries) *
|
|
le32_to_cpu(pgpt_head->sizeof_partition_entry));
|
|
|
|
if (calc_crc32 != le32_to_cpu(pgpt_head->partition_entry_array_crc32)) {
|
|
printf("GUID Partition Table Entry Array CRC is wrong:"
|
|
"0x%x != 0x%x\n",
|
|
le32_to_cpu(pgpt_head->partition_entry_array_crc32),
|
|
calc_crc32);
|
|
|
|
free(*pgpt_pte);
|
|
return 0;
|
|
}
|
|
|
|
/* We're done, all's well */
|
|
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(block_dev_desc_t * dev_desc,
|
|
gpt_header * pgpt_head)
|
|
{
|
|
size_t count = 0, blk_cnt;
|
|
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 = %zu\n", __func__,
|
|
(u32) le32_to_cpu(pgpt_head->num_partition_entries),
|
|
(u32) le32_to_cpu(pgpt_head->sizeof_partition_entry), 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 0x%zX "
|
|
"bytes for GPT Entries\n",
|
|
__func__, count);
|
|
return NULL;
|
|
}
|
|
|
|
/* Read GPT Entries from device */
|
|
blk_cnt = BLOCK_CNT(count, dev_desc);
|
|
if (dev_desc->block_read (dev_desc->dev,
|
|
(lbaint_t)le64_to_cpu(pgpt_head->partition_entry_lba),
|
|
(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;
|
|
}
|
|
}
|
|
#endif
|