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/* ----------------------------------------------------------------------- *
*
* Copyright 2003-2009 H. Peter Anvin - All Rights Reserved
* Copyright 2009-2010 Intel Corporation; author: H. Peter Anvin
* Copyright (C) 2010 Shao Miller
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom
* the Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall
* be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*
* ----------------------------------------------------------------------- */
/**
* @file syslinux/disk.h
*
* Deal with disks and partitions
*/
#ifndef _SYSLINUX_DISK_H
#define _SYSLINUX_DISK_H
#include <com32.h>
#include <stdint.h>
#define SECTOR 512u /* bytes/sector */
struct disk_info {
int disk;
int ebios; /* EBIOS supported on this disk */
int cbios; /* CHS geometry is valid */
uint32_t bps; /* bytes per sector */
uint64_t lbacnt; /* total amount of sectors */
uint32_t cyl;
uint32_t head;
uint32_t spt;
};
struct disk_ebios_dapa {
uint16_t len;
uint16_t count;
uint16_t off;
uint16_t seg;
uint64_t lba;
} __attribute__ ((packed));
struct disk_ebios_eparam {
uint16_t len;
uint16_t info;
uint32_t cyl;
uint32_t head;
uint32_t spt;
uint64_t lbacnt;
uint16_t bps; /* bytes per sector */
uint32_t edd;
uint16_t dpi_sig;
uint8_t dpi_len;
char reserved1[3];
char hostbus[4];
char if_type[8];
char if_path[8];
char dev_path[8];
char reserved2;
uint8_t checksum;
} __attribute__ ((packed));
/**
* CHS (cylinder, head, sector) value extraction macros.
* Taken from WinVBlock. None expand to an lvalue.
*/
#define chs_head(chs) chs[0]
#define chs_sector(chs) (chs[1] & 0x3F)
#define chs_cyl_high(chs) (((uint16_t)(chs[1] & 0xC0)) << 2)
#define chs_cyl_low(chs) ((uint16_t)chs[2])
#define chs_cylinder(chs) (chs_cyl_high(chs) | chs_cyl_low(chs))
typedef uint8_t disk_chs[3];
/* A DOS partition table entry */
struct disk_dos_part_entry {
uint8_t active_flag; /* 0x80 if "active" */
disk_chs start;
uint8_t ostype;
disk_chs end;
uint32_t start_lba;
uint32_t length;
} __attribute__ ((packed));
/* A DOS MBR */
struct disk_dos_mbr {
char code[440];
uint32_t disk_sig;
char pad[2];
struct disk_dos_part_entry table[4];
uint16_t sig;
} __attribute__ ((packed));
#define disk_mbr_sig_magic 0xAA55
/**
* A GPT disk/partition GUID
*
* Be careful with endianness, you must adjust it yourself
* iff you are directly using the fourth data chunk.
* There might be a better header for this...
*/
struct guid {
uint32_t data1;
uint16_t data2;
uint16_t data3;
uint64_t data4;
} __attribute__ ((packed));
/* A GPT partition */
struct disk_gpt_part_entry {
struct guid type;
struct guid uid;
uint64_t lba_first;
uint64_t lba_last;
uint64_t attribs;
char name[72];
} __attribute__ ((packed));
/* A GPT header */
struct disk_gpt_header {
char sig[8];
union {
struct {
uint16_t minor;
uint16_t major;
} fields __attribute__ ((packed));
uint32_t uint32;
char raw[4];
} rev __attribute__ ((packed));
uint32_t hdr_size;
uint32_t chksum;
char reserved1[4];
uint64_t lba_cur;
uint64_t lba_alt;
uint64_t lba_first_usable;
uint64_t lba_last_usable;
struct guid disk_guid;
uint64_t lba_table;
uint32_t part_count;
uint32_t part_size;
uint32_t table_chksum;
char reserved2[1];
} __attribute__ ((packed));
static const char disk_gpt_sig_magic[] = "EFI PART";
extern int disk_int13_retry(const com32sys_t * inreg, com32sys_t * outreg);
extern int disk_get_params(int disk, struct disk_info *const diskinfo);
extern void *disk_read_sectors(const struct disk_info *const diskinfo,
uint64_t lba, uint8_t count);
extern int disk_write_sectors(const struct disk_info *const diskinfo,
uint64_t lba, const void *data, uint8_t count);
extern int disk_write_verify_sectors(const struct disk_info *const diskinfo,
uint64_t lba, const void *buf, uint8_t count);
extern void disk_dos_part_dump(const struct disk_dos_part_entry *const part);
extern void guid_to_str(char *buf, const struct guid *const id);
extern int str_to_guid(const char *buf, struct guid *const id);
extern void disk_gpt_part_dump(const struct disk_gpt_part_entry *const
gpt_part);
extern void disk_gpt_header_dump(const struct disk_gpt_header *const gpt);
#endif /* _SYSLINUX_DISK_H */
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