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/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef VBOOT_REFERENCE_CGPT_H_
#define VBOOT_REFERENCE_CGPT_H_
#include <fcntl.h>
#ifndef HAVE_MACOS
#include <features.h>
#endif
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include "cgpt_endian.h"
#include "cgptlib.h"
#include "gpt.h"
struct legacy_partition {
uint8_t status;
uint8_t f_head;
uint8_t f_sect;
uint8_t f_cyl;
uint8_t type;
uint8_t l_head;
uint8_t l_sect;
uint8_t l_cyl;
uint32_t f_lba;
uint32_t num_sect;
} __attribute__((packed));
// syslinux uses this format:
struct pmbr {
uint8_t bootcode[424];
Guid boot_guid;
uint32_t disk_id;
uint8_t magic[2]; // 0x1d, 0x9a
struct legacy_partition part[4];
uint8_t sig[2]; // 0x55, 0xaa
} __attribute__((packed));
void PMBRToStr(struct pmbr *pmbr, char *str, unsigned int buflen);
// Handle to the drive storing the GPT.
struct drive {
uint64_t size; /* total size (in bytes) */
GptData gpt;
struct pmbr pmbr;
int fd; /* file descriptor */
};
// Opens a block device or file, loads raw GPT data from it.
// 'mode' should be O_RDONLY or O_RDWR.
// If 'drive_size' is 0, both the partitions and GPT structs reside on the same
// 'drive_path'.
// Otherwise, 'drive_size' is taken as the size of the device that all
// partitions will reside on, and 'drive_path' is where we store GPT structs.
//
// Returns CGPT_FAILED if any error happens.
// Returns CGPT_OK if success and information are stored in 'drive'. */
int DriveOpen(const char *drive_path, struct drive *drive, int mode,
uint64_t drive_size);
int DriveClose(struct drive *drive, int update_as_needed);
int CheckValid(const struct drive *drive);
/* Loads sectors from 'drive'.
* *buf is pointed to an allocated memory when returned, and should be
* freed.
*
* drive -- open drive.
* buf -- pointer to buffer pointer
* sector -- offset of starting sector (in sectors)
* sector_bytes -- bytes per sector
* sector_count -- number of sectors to load
*
* Returns CGPT_OK for successful. Aborts if any error occurs.
*/
int Load(struct drive *drive, uint8_t **buf,
const uint64_t sector,
const uint64_t sector_bytes,
const uint64_t sector_count);
/* Saves sectors to 'drive'.
*
* drive -- open drive
* buf -- pointer to buffer
* sector -- starting sector offset
* sector_bytes -- bytes per sector
* sector_count -- number of sector to save
*
* Returns CGPT_OK for successful, CGPT_FAILED for failed.
*/
int Save(struct drive *drive, const uint8_t *buf,
const uint64_t sector,
const uint64_t sector_bytes,
const uint64_t sector_count);
/* Constant global type values to compare against */
extern const Guid guid_chromeos_firmware;
extern const Guid guid_chromeos_kernel;
extern const Guid guid_chromeos_rootfs;
extern const Guid guid_linux_data;
extern const Guid guid_chromeos_reserved;
extern const Guid guid_efi;
extern const Guid guid_unused;
int ReadPMBR(struct drive *drive);
int WritePMBR(struct drive *drive);
/* Convert possibly unterminated UTF16 string to UTF8.
* Caller must prepare enough space for UTF8, which could be up to
* twice the byte length of UTF16 string plus the terminating '\0'.
*
* Return: CGPT_OK --- all character are converted successfully.
* CGPT_FAILED --- convert error, i.e. output buffer is too short.
*/
int UTF16ToUTF8(const uint16_t *utf16, unsigned int maxinput,
uint8_t *utf8, unsigned int maxoutput);
/* Convert null-terminated UTF8 string to UTF16.
* Caller must prepare enough space for UTF16, which is the byte length of UTF8
* plus the terminating 0x0000.
*
* Return: CGPT_OK --- all character are converted successfully.
* CGPT_FAILED --- convert error, i.e. output buffer is too short.
*/
int UTF8ToUTF16(const uint8_t *utf8, uint16_t *utf16, unsigned int maxoutput);
/* Helper functions for supported GPT types. */
int ResolveType(const Guid *type, char *buf);
int SupportedType(const char *name, Guid *type);
void PrintTypes(void);
void EntryDetails(GptEntry *entry, uint32_t index, int raw);
uint32_t GetNumberOfEntries(const struct drive *drive);
GptEntry *GetEntry(GptData *gpt, int secondary, uint32_t entry_index);
void SetRequired(struct drive *drive, int secondary, uint32_t entry_index,
int required);
int GetRequired(struct drive *drive, int secondary, uint32_t entry_index);
void SetLegacyBoot(struct drive *drive, int secondary, uint32_t entry_index,
int legacy_boot);
int GetLegacyBoot(struct drive *drive, int secondary, uint32_t entry_index);
void SetPriority(struct drive *drive, int secondary, uint32_t entry_index,
int priority);
int GetPriority(struct drive *drive, int secondary, uint32_t entry_index);
void SetTries(struct drive *drive, int secondary, uint32_t entry_index,
int tries);
int GetTries(struct drive *drive, int secondary, uint32_t entry_index);
void SetSuccessful(struct drive *drive, int secondary, uint32_t entry_index,
int success);
int GetSuccessful(struct drive *drive, int secondary, uint32_t entry_index);
void SetRaw(struct drive *drive, int secondary, uint32_t entry_index,
uint32_t raw);
void UpdateAllEntries(struct drive *drive);
uint8_t RepairHeader(GptData *gpt, const uint32_t valid_headers);
uint8_t RepairEntries(GptData *gpt, const uint32_t valid_entries);
void UpdateCrc(GptData *gpt);
int IsSynonymous(const GptHeader* a, const GptHeader* b);
int IsUnused(struct drive *drive, int secondary, uint32_t index);
int IsKernel(struct drive *drive, int secondary, uint32_t index);
// Optional. Applications that need this must provide an implementation.
//
// Explanation:
// Some external utilities need to manipulate the GPT, but don't create new
// partitions from scratch. The cgpt executable uses libuuid to provide this
// functionality, but we don't want to have to build or install a separate
// instance of that library just for the 32-bit static post-install tool,
// which doesn't need this function.
int GenerateGuid(Guid *newguid);
// For usage and error messages.
void Error(const char *format, ...);
void Warning(const char *format, ...);
// Command functions.
int check_int_parse(char option, const char *buf);
int check_int_limit(char option, int val, int low, int high);
int cmd_show(int argc, char *argv[]);
int cmd_repair(int argc, char *argv[]);
int cmd_create(int argc, char *argv[]);
int cmd_add(int argc, char *argv[]);
int cmd_boot(int argc, char *argv[]);
int cmd_find(int argc, char *argv[]);
int cmd_edit(int argc, char *argv[]);
int cmd_prioritize(int argc, char *argv[]);
int cmd_legacy(int argc, char *argv[]);
#define ARRAY_COUNT(array) (sizeof(array)/sizeof((array)[0]))
const char *GptError(int errnum);
// Size in chars of the GPT Entry's PartitionName field
#define GPT_PARTNAME_LEN 72
/* The standard "assert" macro goes away when NDEBUG is defined. This doesn't.
*/
#define require(A) do { \
if (!(A)) { \
fprintf(stderr, "condition (%s) failed at %s:%d\n", \
#A, __FILE__, __LINE__); \
exit(1); } \
} while (0)
#endif /* VBOOT_REFERENCE_CGPT_H_ */
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