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authorJean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>2013-02-17 16:39:51 +0100
committerSascha Hauer <s.hauer@pengutronix.de>2013-02-18 09:11:37 +0100
commit760689e5ccf10c51988da2dd9277d716b47dfb53 (patch)
tree02ee0d29479c6a9966169d83ba14ec5f2e767d57 /common/partitions
parent86b3577a725a34160ec5ea60555abb7e4b330ad7 (diff)
downloadbarebox-760689e5ccf10c51988da2dd9277d716b47dfb53.tar.gz
disk: partitions: add EFI GUID Partition Table
form linux 3.8 so you can have part by num or name not by GUID as this is a non human reading name `---- ffe08000.sata `---- 0x00000000-0x3fffffff: /dev/ata0 `---- 0x00100000-0x063fffff: /dev/ata0.0 `---- 0x00100000-0x063fffff: /dev/ata0.boot `---- 0x06400000-0x3fefffff: /dev/ata0.1 `---- 0x06400000-0x3fefffff: /dev/ata0.linux Cc: Rob Herring <rob.herring@calxeda.com> Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'common/partitions')
-rw-r--r--common/partitions/Kconfig19
-rw-r--r--common/partitions/Makefile1
-rw-r--r--common/partitions/efi.c477
-rw-r--r--common/partitions/efi.h123
4 files changed, 620 insertions, 0 deletions
diff --git a/common/partitions/Kconfig b/common/partitions/Kconfig
index 3f81c2f..077091c 100644
--- a/common/partitions/Kconfig
+++ b/common/partitions/Kconfig
@@ -11,3 +11,22 @@ config PARTITION_DISK_DOS
bool "DOS partition support"
help
Add support to handle partitions in DOS style.
+
+config PARTITION_DISK_EFI
+ depends on PARTITION_DISK
+ select CRC32
+ bool "EFI: GPT partition support"
+ help
+ Add support to handle partitions in GUID Partition Table style.
+
+config PARTITION_DISK_EFI_GPT_NO_FORCE
+ depends on PARTITION_DISK_EFI
+ default y
+ bool "EFI: GPT: force test Protective MBR for validity"
+ help
+ This will be added to the EFI Spec. per Intel after v1.02
+
+config PARTITION_DISK_EFI_GPT_COMPARE
+ depends on PARTITION_DISK_EFI
+ default y
+ bool "EFI: GPT: compare primary and Alternate GPT header for validity"
diff --git a/common/partitions/Makefile b/common/partitions/Makefile
index 0a5c70d..2b0c5b4 100644
--- a/common/partitions/Makefile
+++ b/common/partitions/Makefile
@@ -1 +1,2 @@
obj-$(CONFIG_PARTITION_DISK_DOS) += dos.o
+obj-$(CONFIG_PARTITION_DISK_EFI) += efi.o
diff --git a/common/partitions/efi.c b/common/partitions/efi.c
new file mode 100644
index 0000000..e450eeb
--- /dev/null
+++ b/common/partitions/efi.c
@@ -0,0 +1,477 @@
+/************************************************************
+ * EFI GUID Partition Table handling
+ *
+ * http://www.uefi.org/specs/
+ * http://www.intel.com/technology/efi/
+ *
+ * efi.[ch] by Matt Domsch <Matt_Domsch@dell.com>
+ * Copyright 2000,2001,2002,2004 Dell Inc.
+ *
+ * Copyright (C) 2013 Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
+ *
+ * Under GPLv2 only
+ */
+
+#include <common.h>
+#include <disks.h>
+#include <init.h>
+#include <asm/unaligned.h>
+#include <dma.h>
+#include <linux/ctype.h>
+
+#include "efi.h"
+#include "parser.h"
+
+static int force_gpt = IS_ENABLED(CONFIG_PARTITION_DISK_EFI_GPT_NO_FORCE);
+
+/**
+ * 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
+ *
+ * This function uses the little endian Ethernet polynomial
+ * but seeds the function with ~0, and xor's with ~0 at the end.
+ * Note, the EFI Specification, v1.02, has a reference to
+ * Dr. Dobbs Journal, May 1994 (actually it's in May 1992).
+ */
+static inline u32
+efi_crc32(const void *buf, unsigned long len)
+{
+ return crc32(0, buf, len);
+}
+
+/**
+ * last_lba(): return number of last logical block of device
+ * @bdev: block device
+ *
+ * Description: Returns last LBA value on success, 0 on error.
+ * This is stored (by sd and ide-geometry) in
+ * the part[0] entry for this disk, and is the number of
+ * physical sectors available on the disk.
+ */
+static u64 last_lba(struct block_device *bdev)
+{
+ if (!bdev)
+ return 0;
+ return bdev->num_blocks;
+}
+
+/**
+ * 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 block_device *blk,
+ gpt_header * pgpt_head)
+{
+ size_t count = 0;
+ gpt_entry *pte = NULL;
+ unsigned long from, size;
+ int ret;
+
+ count = le32_to_cpu(pgpt_head->num_partition_entries) *
+ le32_to_cpu(pgpt_head->sizeof_partition_entry);
+
+ if (!count)
+ return NULL;
+ pte = kzalloc(count, GFP_KERNEL);
+ if (!pte)
+ return NULL;
+
+ from = le64_to_cpu(pgpt_head->partition_entry_lba);
+ size = count / GPT_BLOCK_SIZE;
+ ret = blk->ops->read(blk, pte, from, size);
+ if (ret) {
+ kfree(pte);
+ pte=NULL;
+ return NULL;
+ }
+ return pte;
+}
+
+static inline unsigned short bdev_logical_block_size(struct block_device
+*bdev)
+{
+ return SECTOR_SIZE;
+}
+
+/**
+ * alloc_read_gpt_header(): Allocates GPT header, reads into it from disk
+ * @state
+ * @lba is the Logical Block Address of the partition table
+ *
+ * Description: returns GPT header on success, NULL on error. Allocates
+ * and fills a GPT header starting at @ from @state->bdev.
+ * Note: remember to free gpt when finished with it.
+ */
+static gpt_header *alloc_read_gpt_header(struct block_device *blk,
+ u64 lba)
+{
+ gpt_header *gpt;
+ unsigned ssz = bdev_logical_block_size(blk);
+ int ret;
+
+ gpt = kzalloc(ssz, GFP_KERNEL);
+ if (!gpt)
+ return NULL;
+
+ ret = blk->ops->read(blk, gpt, lba, 1);
+ if (ret) {
+ kfree(gpt);
+ gpt=NULL;
+ return NULL;
+ }
+
+ return gpt;
+}
+
+/**
+ * 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(struct block_device *blk, u64 lba,
+ gpt_header **gpt, gpt_entry **ptes)
+{
+ u32 crc, origcrc;
+ u64 lastlba;
+
+ if (!ptes)
+ return 0;
+ if (!(*gpt = alloc_read_gpt_header(blk, lba)))
+ return 0;
+
+ /* Check the GPT header signature */
+ if (le64_to_cpu((*gpt)->signature) != GPT_HEADER_SIGNATURE) {
+ dev_dbg(blk->dev, "GUID Partition Table Header signature is wrong:"
+ "0x%llX != 0x%llX\n",
+ (unsigned long long)le64_to_cpu((*gpt)->signature),
+ (unsigned long long)GPT_HEADER_SIGNATURE);
+ goto fail;
+ }
+
+ /* Check the GUID Partition Table CRC */
+ origcrc = le32_to_cpu((*gpt)->header_crc32);
+ (*gpt)->header_crc32 = 0;
+ crc = efi_crc32((const unsigned char *) (*gpt), le32_to_cpu((*gpt)->header_size));
+
+ if (crc != origcrc) {
+ dev_dbg(blk->dev, "GUID Partition Table Header CRC is wrong: %x != %x\n",
+ crc, origcrc);
+ goto fail;
+ }
+ (*gpt)->header_crc32 = cpu_to_le32(origcrc);
+
+ /* Check that the my_lba entry points to the LBA that contains
+ * the GUID Partition Table */
+ if (le64_to_cpu((*gpt)->my_lba) != lba) {
+ dev_dbg(blk->dev, "GPT: my_lba incorrect: %llX != %llX\n",
+ (unsigned long long)le64_to_cpu((*gpt)->my_lba),
+ (unsigned long long)lba);
+ goto fail;
+ }
+
+ /* Check the first_usable_lba and last_usable_lba are within the disk. */
+ lastlba = last_lba(blk);
+ if (le64_to_cpu((*gpt)->first_usable_lba) > lastlba) {
+ dev_dbg(blk->dev, "GPT: first_usable_lba incorrect: %lld > %lld\n",
+ (unsigned long long)le64_to_cpu((*gpt)->first_usable_lba),
+ (unsigned long long)lastlba);
+ goto fail;
+ }
+ if (le64_to_cpu((*gpt)->last_usable_lba) > lastlba) {
+ dev_dbg(blk->dev, "GPT: last_usable_lba incorrect: %lld > %lld\n",
+ (unsigned long long)le64_to_cpu((*gpt)->last_usable_lba),
+ (unsigned long long)lastlba);
+ goto fail;
+ }
+
+ if (!(*ptes = alloc_read_gpt_entries(blk, *gpt)))
+ goto fail;
+
+ /* Check the GUID Partition Table Entry Array CRC */
+ crc = efi_crc32((const unsigned char *)*ptes,
+ le32_to_cpu((*gpt)->num_partition_entries) *
+ le32_to_cpu((*gpt)->sizeof_partition_entry));
+
+ if (crc != le32_to_cpu((*gpt)->partition_entry_array_crc32)) {
+ dev_dbg(blk->dev, "GUID Partitition Entry Array CRC check failed.\n");
+ goto fail_ptes;
+ }
+
+ /* We're done, all's well */
+ return 1;
+
+ fail_ptes:
+ kfree(*ptes);
+ *ptes = NULL;
+ fail:
+ kfree(*gpt);
+ *gpt = NULL;
+ return 0;
+}
+
+/**
+ * is_pte_valid() - tests one PTE for validity
+ * @pte is the pte to check
+ * @lastlba is last lba of the disk
+ *
+ * Description: returns 1 if valid, 0 on error.
+ */
+static inline int
+is_pte_valid(const gpt_entry *pte, const u64 lastlba)
+{
+ if ((!efi_guidcmp(pte->partition_type_guid, NULL_GUID)) ||
+ le64_to_cpu(pte->starting_lba) > lastlba ||
+ le64_to_cpu(pte->ending_lba) > lastlba)
+ return 0;
+ return 1;
+}
+
+/**
+ * compare_gpts() - Search disk for valid GPT headers and PTEs
+ * @pgpt is the primary GPT header
+ * @agpt is the alternate GPT header
+ * @lastlba is the last LBA number
+ * Description: Returns nothing. Sanity checks pgpt and agpt fields
+ * and prints warnings on discrepancies.
+ *
+ */
+static void
+compare_gpts(struct device_d *dev, gpt_header *pgpt, gpt_header *agpt, u64 lastlba)
+{
+ int error_found = 0;
+ if (!pgpt || !agpt)
+ return;
+ if (le64_to_cpu(pgpt->my_lba) != le64_to_cpu(agpt->alternate_lba)) {
+ dev_warn(dev,
+ "GPT:Primary header LBA != Alt. header alternate_lba\n");
+ dev_warn(dev, "GPT:%lld != %lld\n",
+ (unsigned long long)le64_to_cpu(pgpt->my_lba),
+ (unsigned long long)le64_to_cpu(agpt->alternate_lba));
+ error_found++;
+ }
+ if (le64_to_cpu(pgpt->alternate_lba) != le64_to_cpu(agpt->my_lba)) {
+ dev_warn(dev,
+ "GPT:Primary header alternate_lba != Alt. header my_lba\n");
+ dev_warn(dev, "GPT:%lld != %lld\n",
+ (unsigned long long)le64_to_cpu(pgpt->alternate_lba),
+ (unsigned long long)le64_to_cpu(agpt->my_lba));
+ error_found++;
+ }
+ if (le64_to_cpu(pgpt->first_usable_lba) !=
+ le64_to_cpu(agpt->first_usable_lba)) {
+ dev_warn(dev, "GPT:first_usable_lbas don't match.\n");
+ dev_warn(dev, "GPT:%lld != %lld\n",
+ (unsigned long long)le64_to_cpu(pgpt->first_usable_lba),
+ (unsigned long long)le64_to_cpu(agpt->first_usable_lba));
+ error_found++;
+ }
+ if (le64_to_cpu(pgpt->last_usable_lba) !=
+ le64_to_cpu(agpt->last_usable_lba)) {
+ dev_warn(dev, "GPT:last_usable_lbas don't match.\n");
+ dev_warn(dev, "GPT:%lld != %lld\n",
+ (unsigned long long)le64_to_cpu(pgpt->last_usable_lba),
+ (unsigned long long)le64_to_cpu(agpt->last_usable_lba));
+ error_found++;
+ }
+ if (efi_guidcmp(pgpt->disk_guid, agpt->disk_guid)) {
+ dev_warn(dev, "GPT:disk_guids don't match.\n");
+ error_found++;
+ }
+ if (le32_to_cpu(pgpt->num_partition_entries) !=
+ le32_to_cpu(agpt->num_partition_entries)) {
+ dev_warn(dev, "GPT:num_partition_entries don't match: "
+ "0x%x != 0x%x\n",
+ le32_to_cpu(pgpt->num_partition_entries),
+ le32_to_cpu(agpt->num_partition_entries));
+ error_found++;
+ }
+ if (le32_to_cpu(pgpt->sizeof_partition_entry) !=
+ le32_to_cpu(agpt->sizeof_partition_entry)) {
+ dev_warn(dev,
+ "GPT:sizeof_partition_entry values don't match: "
+ "0x%x != 0x%x\n",
+ le32_to_cpu(pgpt->sizeof_partition_entry),
+ le32_to_cpu(agpt->sizeof_partition_entry));
+ error_found++;
+ }
+ if (le32_to_cpu(pgpt->partition_entry_array_crc32) !=
+ le32_to_cpu(agpt->partition_entry_array_crc32)) {
+ dev_warn(dev,
+ "GPT:partition_entry_array_crc32 values don't match: "
+ "0x%x != 0x%x\n",
+ le32_to_cpu(pgpt->partition_entry_array_crc32),
+ le32_to_cpu(agpt->partition_entry_array_crc32));
+ error_found++;
+ }
+ if (le64_to_cpu(pgpt->alternate_lba) != lastlba) {
+ dev_warn(dev,
+ "GPT:Primary header thinks Alt. header is not at the end of the disk.\n");
+ dev_warn(dev, "GPT:%lld != %lld\n",
+ (unsigned long long)le64_to_cpu(pgpt->alternate_lba),
+ (unsigned long long)lastlba);
+ error_found++;
+ }
+
+ if (le64_to_cpu(agpt->my_lba) != lastlba) {
+ dev_warn(dev,
+ "GPT:Alternate GPT header not at the end of the disk.\n");
+ dev_warn(dev, "GPT:%lld != %lld\n",
+ (unsigned long long)le64_to_cpu(agpt->my_lba),
+ (unsigned long long)lastlba);
+ error_found++;
+ }
+
+ if (error_found)
+ dev_warn(dev, "GPT: Use GNU Parted to correct GPT errors.\n");
+ return;
+}
+
+/**
+ * find_valid_gpt() - Search disk for valid GPT headers and PTEs
+ * @state
+ * @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 newly allocated GPT header and PTEs.
+ * Validity depends on PMBR being valid (or being overridden by the
+ * 'gpt' kernel command line option) and finding either the Primary
+ * GPT header and PTEs valid, or the Alternate GPT header and PTEs
+ * valid. If the Primary GPT header is not valid, the Alternate GPT header
+ * is not checked unless the 'gpt' kernel command line option is passed.
+ * This protects against devices which misreport their size, and forces
+ * the user to decide to use the Alternate GPT.
+ */
+static int find_valid_gpt(void *buf, struct block_device *blk, gpt_header **gpt,
+ gpt_entry **ptes)
+{
+ int good_pgpt = 0, good_agpt = 0;
+ gpt_header *pgpt = NULL, *agpt = NULL;
+ gpt_entry *pptes = NULL, *aptes = NULL;
+ u64 lastlba;
+
+ if (!ptes)
+ return 0;
+
+ lastlba = last_lba(blk);
+ if (force_gpt) {
+ /* This will be added to the EFI Spec. per Intel after v1.02. */
+ if (file_detect_type(buf, SECTOR_SIZE * 2) != filetype_gpt)
+ goto fail;
+ }
+
+ good_pgpt = is_gpt_valid(blk, GPT_PRIMARY_PARTITION_TABLE_LBA,
+ &pgpt, &pptes);
+ if (good_pgpt)
+ good_agpt = is_gpt_valid(blk,
+ le64_to_cpu(pgpt->alternate_lba),
+ &agpt, &aptes);
+ if (!good_agpt && force_gpt)
+ good_agpt = is_gpt_valid(blk, lastlba, &agpt, &aptes);
+
+ /* The obviously unsuccessful case */
+ if (!good_pgpt && !good_agpt)
+ goto fail;
+
+ if (IS_ENABLED(CONFIG_PARTITION_DISK_EFI_GPT_COMPARE))
+ compare_gpts(blk->dev, pgpt, agpt, lastlba);
+
+ /* The good cases */
+ if (good_pgpt) {
+ *gpt = pgpt;
+ *ptes = pptes;
+ kfree(agpt);
+ kfree(aptes);
+ if (!good_agpt)
+ dev_warn(blk->dev, "Alternate GPT is invalid, using primary GPT.\n");
+ return 1;
+ }
+ else if (good_agpt) {
+ *gpt = agpt;
+ *ptes = aptes;
+ kfree(pgpt);
+ kfree(pptes);
+ dev_warn(blk->dev, "Primary GPT is invalid, using alternate GPT.\n");
+ return 1;
+ }
+
+ fail:
+ kfree(pgpt);
+ kfree(agpt);
+ kfree(pptes);
+ kfree(aptes);
+ *gpt = NULL;
+ *ptes = NULL;
+ return 0;
+}
+
+static void part_set_efi_name(gpt_entry *pte, char *dest)
+{
+ int i;
+
+ for (i = 0; i < GPT_PARTNAME_MAX_SIZE ; i++) {
+ u8 c;
+ c = pte->partition_name[i] & 0xff;
+ c = (c && !isprint(c)) ? '.' : c;
+ dest[i] = c;
+ }
+ dest[i] = 0;
+}
+
+static void efi_partition(void *buf, struct block_device *blk,
+ struct partition_desc *pd)
+{
+ gpt_header *gpt = NULL;
+ gpt_entry *ptes = NULL;
+ int i = 0;
+ int nb_part;
+ struct partition *pentry;
+
+ if (!find_valid_gpt(buf, blk, &gpt, &ptes) || !gpt || !ptes) {
+ kfree(gpt);
+ kfree(ptes);
+ return;
+ }
+
+ nb_part = le32_to_cpu(gpt->num_partition_entries);
+ for (i = 0; i < MAX_PARTITION && i < nb_part; i++) {
+ if (!is_pte_valid(&ptes[i], last_lba(blk))) {
+ dev_dbg(blk->dev, "Invalid pte %d\n", i);
+ return;
+ }
+
+ pentry = &pd->parts[pd->used_entries];
+ pentry->first_sec = le64_to_cpu(ptes[i].starting_lba);
+ pentry->size = le64_to_cpu(ptes[i].ending_lba) - pentry->first_sec;
+ pentry->size++;
+ part_set_efi_name(&ptes[i], pentry->name);
+ pd->used_entries++;
+ }
+
+ if (i > MAX_PARTITION)
+ dev_warn(blk->dev, "num_partition_entries (%d) > max partition number (%d)\n",
+ nb_part, MAX_PARTITION);
+}
+
+static struct partition_parser efi_partition_parser = {
+ .parse = efi_partition,
+ .type = filetype_gpt,
+};
+
+static int efi_partition_init(void)
+{
+ return partition_parser_register(&efi_partition_parser);
+}
+postconsole_initcall(efi_partition_init);
diff --git a/common/partitions/efi.h b/common/partitions/efi.h
new file mode 100644
index 0000000..c7734bd
--- /dev/null
+++ b/common/partitions/efi.h
@@ -0,0 +1,123 @@
+/************************************************************
+ * EFI GUID Partition Table
+ * Per Intel EFI Specification v1.02
+ * http://developer.intel.com/technology/efi/efi.htm
+ *
+ * By Matt Domsch <Matt_Domsch@dell.com> Fri Sep 22 22:15:56 CDT 2000
+ * Copyright 2000,2001 Dell Inc.
+ *
+ * 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
+ *
+ ************************************************************/
+
+#ifndef FS_PART_EFI_H_INCLUDED
+#define FS_PART_EFI_H_INCLUDED
+
+#include <linux/efi.h>
+
+#define MSDOS_MBR_SIGNATURE 0xaa55
+#define EFI_PMBR_OSTYPE_EFI 0xEF
+#define EFI_PMBR_OSTYPE_EFI_GPT 0xEE
+
+#define GPT_BLOCK_SIZE 512
+#define GPT_HEADER_SIGNATURE 0x5452415020494645ULL
+#define GPT_HEADER_REVISION_V1 0x00010000
+#define GPT_PRIMARY_PARTITION_TABLE_LBA 1
+
+#define PARTITION_SYSTEM_GUID \
+ EFI_GUID( 0xC12A7328, 0xF81F, 0x11d2, \
+ 0xBA, 0x4B, 0x00, 0xA0, 0xC9, 0x3E, 0xC9, 0x3B)
+#define LEGACY_MBR_PARTITION_GUID \
+ EFI_GUID( 0x024DEE41, 0x33E7, 0x11d3, \
+ 0x9D, 0x69, 0x00, 0x08, 0xC7, 0x81, 0xF3, 0x9F)
+#define PARTITION_MSFT_RESERVED_GUID \
+ EFI_GUID( 0xE3C9E316, 0x0B5C, 0x4DB8, \
+ 0x81, 0x7D, 0xF9, 0x2D, 0xF0, 0x02, 0x15, 0xAE)
+#define PARTITION_BASIC_DATA_GUID \
+ EFI_GUID( 0xEBD0A0A2, 0xB9E5, 0x4433, \
+ 0x87, 0xC0, 0x68, 0xB6, 0xB7, 0x26, 0x99, 0xC7)
+#define PARTITION_LINUX_RAID_GUID \
+ EFI_GUID( 0xa19d880f, 0x05fc, 0x4d3b, \
+ 0xa0, 0x06, 0x74, 0x3f, 0x0f, 0x84, 0x91, 0x1e)
+#define PARTITION_LINUX_SWAP_GUID \
+ EFI_GUID( 0x0657fd6d, 0xa4ab, 0x43c4, \
+ 0x84, 0xe5, 0x09, 0x33, 0xc8, 0x4b, 0x4f, 0x4f)
+#define PARTITION_LINUX_LVM_GUID \
+ EFI_GUID( 0xe6d6d379, 0xf507, 0x44c2, \
+ 0xa2, 0x3c, 0x23, 0x8f, 0x2a, 0x3d, 0xf9, 0x28)
+
+/* based on linux/include/genhd.h */
+struct legacy_partition {
+ unsigned char boot_ind; /* 0x80 - active */
+ unsigned char head; /* starting head */
+ unsigned char sector; /* starting sector */
+ unsigned char cyl; /* starting cylinder */
+ unsigned char sys_ind; /* What partition type */
+ unsigned char end_head; /* end head */
+ unsigned char end_sector; /* end sector */
+ unsigned char end_cyl; /* end cylinder */
+ __le32 start_sect; /* starting sector counting from 0 */
+ __le32 nr_sects; /* nr of sectors in partition */
+} __attribute__ ((packed));
+
+/* based on linux/fs/partitions/efi.h */
+typedef struct _gpt_header {
+ __le64 signature;
+ __le32 revision;
+ __le32 header_size;
+ __le32 header_crc32;
+ __le32 reserved1;
+ __le64 my_lba;
+ __le64 alternate_lba;
+ __le64 first_usable_lba;
+ __le64 last_usable_lba;
+ efi_guid_t disk_guid;
+ __le64 partition_entry_lba;
+ __le32 num_partition_entries;
+ __le32 sizeof_partition_entry;
+ __le32 partition_entry_array_crc32;
+
+ /* The rest of the logical block is reserved by UEFI and must be zero.
+ * EFI standard handles this by:
+ *
+ * uint8_t reserved2[ BlockSize - 92 ];
+ */
+} __attribute__ ((packed)) gpt_header;
+
+typedef struct _gpt_entry_attributes {
+ u64 required_to_function:1;
+ u64 reserved:47;
+ u64 type_guid_specific:16;
+} __attribute__ ((packed)) gpt_entry_attributes;
+
+#define GPT_PARTNAME_MAX_SIZE (72 / sizeof (efi_char16_t))
+typedef struct _gpt_entry {
+ efi_guid_t partition_type_guid;
+ efi_guid_t unique_partition_guid;
+ __le64 starting_lba;
+ __le64 ending_lba;
+ gpt_entry_attributes attributes;
+ efi_char16_t partition_name[GPT_PARTNAME_MAX_SIZE];
+} __attribute__ ((packed)) gpt_entry;
+
+typedef struct _legacy_mbr {
+ u8 boot_code[440];
+ __le32 unique_mbr_signature;
+ __le16 unknown;
+ struct legacy_partition partition_record[4];
+ __le16 signature;
+} __attribute__ ((packed)) legacy_mbr;
+
+#endif /* _DISK_PART_EFI_H */