Add support for CONFIG_EFI_PARTITION (GUID Partition Table)
The GUID (Globally Unique Identifier) Partition Table (GPT) is a part
of EFI. See http://en.wikipedia.org/wiki/GUID_Partition_Table
Based on linux/fs/partitions/efi.[ch]
Signed-off-by: Richard Retanubun <RichardRetanubun@RugggedCom.com>
diff --git a/disk/part_efi.c b/disk/part_efi.c
new file mode 100644
index 0000000..979019a
--- /dev/null
+++ b/disk/part_efi.c
@@ -0,0 +1,425 @@
+/*
+ * Copyright (C) 2008 RuggedCom, Inc.
+ * Richard Retanubun <RichardRetanubun@RuggedCom.com>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+ * Problems with CFG_64BIT_LBA:
+ *
+ * struct disk_partition.start in include/part.h is sized as ulong.
+ * When CFG_64BIT_LBA is activated, lbaint_t changes from ulong to uint64_t.
+ * For now, it is cast back to ulong at assignment.
+ *
+ * This limits the maximum size of addressable storage to < 2 Terra Bytes
+ */
+#include <common.h>
+#include <command.h>
+#include <ide.h>
+#include <malloc.h>
+#include "part_efi.h"
+
+#if (defined(CONFIG_CMD_IDE) || \
+ defined(CONFIG_CMD_SATA) || \
+ defined(CONFIG_CMD_SCSI) || \
+ defined(CONFIG_CMD_USB) || \
+ defined(CONFIG_MMC) || \
+ defined(CONFIG_SYSTEMACE) ) && defined(CONFIG_EFI_PARTITION)
+
+/* Convert char[2] in little endian format to the host format integer
+ */
+static inline unsigned short le16_to_int(unsigned char *le16)
+{
+ return ((le16[1] << 8) + le16[0]);
+}
+
+/* Convert char[4] in little endian format to the host format integer
+ */
+static inline unsigned long le32_to_int(unsigned char *le32)
+{
+ return ((le32[3] << 24) + (le32[2] << 16) + (le32[1] << 8) + le32[0]);
+}
+
+/* Convert char[8] in little endian format to the host format integer
+ */
+static inline unsigned long long le64_to_int(unsigned char *le64)
+{
+ return (((unsigned long long)le64[7] << 56) +
+ ((unsigned long long)le64[6] << 48) +
+ ((unsigned long long)le64[5] << 40) +
+ ((unsigned long long)le64[4] << 32) +
+ ((unsigned long long)le64[3] << 24) +
+ ((unsigned long long)le64[2] << 16) +
+ ((unsigned long long)le64[1] << 8) +
+ (unsigned long long)le64[0]);
+}
+
+/**
+ * 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 unsigned long efi_crc32(const void *buf, unsigned long 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(block_dev_desc_t * dev_desc, unsigned long long lba,
+ gpt_header * pgpt_head, gpt_entry ** pgpt_pte);
+
+static gpt_entry *alloc_read_gpt_entries(block_dev_desc_t * dev_desc,
+ gpt_header * pgpt_head);
+
+static int is_pte_valid(gpt_entry * pte);
+
+/*
+ * Public Functions (include/part.h)
+ */
+
+void print_part_efi(block_dev_desc_t * dev_desc)
+{
+ gpt_header gpt_head;
+ gpt_entry **pgpt_pte = NULL;
+ int i = 0;
+
+ if (!dev_desc) {
+ printf("%s: Invalid Argument(s)\n", __FUNCTION__);
+ return;
+ }
+ /* This function validates AND fills in the GPT header and PTE */
+ if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
+ &(gpt_head), pgpt_pte) != 1) {
+ printf("%s: *** ERROR: Invalid GPT ***\n", __FUNCTION__);
+ return;
+ }
+
+ debug("%s: gpt-entry at 0x%08X\n", __FUNCTION__, (unsigned int)*pgpt_pte);
+
+ printf("Part Start LBA End LBA\n");
+ for (i = 0; i < le32_to_int(gpt_head.num_partition_entries); i++) {
+
+ if (is_pte_valid(&(*pgpt_pte)[i])) {
+ printf("%s%d 0x%llX 0x%llX\n", GPT_ENTRY_NAME,
+ (i + 1),
+ le64_to_int((*pgpt_pte)[i].starting_lba),
+ le64_to_int((*pgpt_pte)[i].ending_lba));
+ } else {
+ break; /* Stop at the first non valid PTE */
+ }
+ }
+
+ /* Remember to free pte */
+ if (*pgpt_pte != NULL) {
+ debug("%s: Freeing pgpt_pte\n", __FUNCTION__);
+ free(*pgpt_pte);
+ }
+ return;
+}
+
+int get_partition_info_efi(block_dev_desc_t * dev_desc, int part,
+ disk_partition_t * info)
+{
+ gpt_header gpt_head;
+ gpt_entry **pgpt_pte = NULL;
+
+ /* "part" argument must be at least 1 */
+ if (!dev_desc || !info || part < 1) {
+ printf("%s: Invalid Argument(s)\n", __FUNCTION__);
+ return -1;
+ }
+
+ /* This function validates AND fills in the GPT header and PTE */
+ if (is_gpt_valid(dev_desc, GPT_PRIMARY_PARTITION_TABLE_LBA,
+ &(gpt_head), pgpt_pte) != 1) {
+ printf("%s: *** ERROR: Invalid GPT ***\n", __FUNCTION__);
+ return -1;
+ }
+
+ /* The ulong casting limits the maximum disk size to 2 TB */
+ info->start = (ulong) le64_to_int((*pgpt_pte)[part - 1].starting_lba);
+ info->size = (ulong) le64_to_int((*pgpt_pte)[part - 1].ending_lba) - info->start;
+ info->blksz = GPT_BLOCK_SIZE;
+
+ sprintf((char *)info->name, "%s%d\n", GPT_ENTRY_NAME, part);
+ sprintf((char *)info->type, "U-Boot");
+
+ debug("%s: start 0x%lX, size 0x%lX, name %s", __FUNCTION__,
+ info->start, info->size, info->name);
+
+ /* Remember to free pte */
+ if (*pgpt_pte != NULL) {
+ debug("%s: Freeing pgpt_pte\n", __FUNCTION__);
+ free(*pgpt_pte);
+ }
+ return 0;
+}
+
+int test_part_efi(block_dev_desc_t * dev_desc)
+{
+ legacy_mbr legacymbr;
+
+ /* Read legacy MBR from block 0 and validate it */
+ if ((dev_desc->block_read(dev_desc->dev, 0, 1, (ulong *) & legacymbr) != 1)
+ || (is_pmbr_valid(&legacymbr) != 1)) {
+ return -1;
+ }
+ return 0;
+}
+
+/*
+ * 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 &&
+ le32_to_int(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_int(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, unsigned long long lba,
+ gpt_header * pgpt_head, gpt_entry ** pgpt_pte)
+{
+ unsigned char crc32_backup[4] = { 0 };
+ unsigned long calc_crc32;
+ unsigned long long lastlba;
+
+ if (!dev_desc || !pgpt_head) {
+ printf("%s: Invalid Argument(s)\n", __FUNCTION__);
+ return 0;
+ }
+
+ /* Read GPT Header from device */
+ if (dev_desc->block_read(dev_desc->dev, lba, 1, pgpt_head) != 1) {
+ printf("*** ERROR: Can't read GPT header ***\n");
+ return 0;
+ }
+
+ /* Check the GPT header signature */
+ if (le64_to_int(pgpt_head->signature) != GPT_HEADER_SIGNATURE) {
+ printf("GUID Partition Table Header signature is wrong:"
+ "0x%llX != 0x%llX\n",
+ (unsigned long long)le64_to_int(pgpt_head->signature),
+ (unsigned long long)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_int(pgpt_head->header_size));
+
+ memcpy(pgpt_head->header_crc32, crc32_backup, sizeof(crc32_backup));
+
+ if (calc_crc32 != le32_to_int(crc32_backup)) {
+ printf("GUID Partition Table Header CRC is wrong:"
+ "0x%08lX != 0x%08lX\n",
+ le32_to_int(crc32_backup), calc_crc32);
+ return 0;
+ }
+
+ /* Check that the my_lba entry points to the LBA that contains the GPT */
+ if (le64_to_int(pgpt_head->my_lba) != lba) {
+ printf("GPT: my_lba incorrect: %llX != %llX\n",
+ (unsigned long long)le64_to_int(pgpt_head->my_lba),
+ (unsigned long long)lba);
+ return 0;
+ }
+
+ /* Check the first_usable_lba and last_usable_lba are within the disk. */
+ lastlba = (unsigned long long)dev_desc->lba;
+ if (le64_to_int(pgpt_head->first_usable_lba) > lastlba) {
+ printf("GPT: first_usable_lba incorrect: %llX > %llX\n",
+ le64_to_int(pgpt_head->first_usable_lba), lastlba);
+ return 0;
+ }
+ if (le64_to_int(pgpt_head->last_usable_lba) > lastlba) {
+ printf("GPT: last_usable_lba incorrect: %llX > %llX\n",
+ le64_to_int(pgpt_head->last_usable_lba), lastlba);
+ return 0;
+ }
+
+ debug("GPT: first_usable_lba: %llX last_usable_lba %llX last lba %llX\n",
+ le64_to_int(pgpt_head->first_usable_lba),
+ le64_to_int(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_int(pgpt_head->num_partition_entries) *
+ le32_to_int(pgpt_head->sizeof_partition_entry));
+
+ if (calc_crc32 != le32_to_int(pgpt_head->partition_entry_array_crc32)) {
+ printf("GUID Partition Table Entry Array CRC is wrong:"
+ "0x%08lX != 0x%08lX\n",
+ le32_to_int(pgpt_head->partition_entry_array_crc32),
+ calc_crc32);
+
+ if (*pgpt_pte != NULL) {
+ 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;
+ gpt_entry *pte = NULL;
+
+ if (!dev_desc || !pgpt_head) {
+ printf("%s: Invalid Argument(s)\n", __FUNCTION__);
+ return NULL;
+ }
+
+ count = le32_to_int(pgpt_head->num_partition_entries) *
+ le32_to_int(pgpt_head->sizeof_partition_entry);
+
+ debug("%s: count = %lu * %lu = %u\n", __FUNCTION__,
+ le32_to_int(pgpt_head->num_partition_entries),
+ le32_to_int(pgpt_head->sizeof_partition_entry), count);
+
+ /* Allocate memory for PTE, remember to FREE */
+ if (count != 0) {
+ pte = malloc(count);
+ }
+
+ if (count == 0 || pte == NULL) {
+ printf("%s: ERROR: Can't allocate 0x%X bytes for GPT Entries\n",
+ __FUNCTION__, count);
+ return NULL;
+ }
+
+ /* Read GPT Entries from device */
+ if (dev_desc->block_read (dev_desc->dev,
+ (unsigned long)le64_to_int(pgpt_head->partition_entry_lba),
+ (lbaint_t) (count / GPT_BLOCK_SIZE), pte)
+ != (count / GPT_BLOCK_SIZE)) {
+
+ 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", __FUNCTION__);
+ 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", __FUNCTION__,
+ (unsigned int)pte);
+
+ return 0;
+ } else {
+ return 1;
+ }
+}
+#endif