188 lines
5.5 KiB
C
188 lines
5.5 KiB
C
/* ----------------------------------------------------------------------- *
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*
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* Copyright 2003-2009 H. Peter Anvin - All Rights Reserved
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* Copyright 2009-2010 Intel Corporation; author: H. Peter Anvin
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* Copyright (C) 2010 Shao Miller
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*
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* Permission is hereby granted, free of charge, to any person
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* obtaining a copy of this software and associated documentation
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* files (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use,
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* copy, modify, merge, publish, distribute, sublicense, and/or
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* sell copies of the Software, and to permit persons to whom
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* the Software is furnished to do so, subject to the following
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* conditions:
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*
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* The above copyright notice and this permission notice shall
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* be included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* ----------------------------------------------------------------------- */
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/**
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* @file syslinux/disk.h
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*
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* Deal with disks and partitions
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*/
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#ifndef _SYSLINUX_DISK_H
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#define _SYSLINUX_DISK_H
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#include <com32.h>
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#include <stdint.h>
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#define SECTOR 512u /* bytes/sector */
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enum disk_op_codes {
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EBIOS_READ_CODE = 0x42, /* Extended read */
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EBIOS_WRITE_CODE = 0x43, /* Extended write */
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CHS_READ_CODE = 0x02,
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CHS_WRITE_CODE = 0x03,
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};
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struct disk_info {
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int disk;
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int ebios; /* EBIOS supported on this disk */
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int cbios; /* CHS geometry is valid */
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uint32_t bps; /* bytes per sector */
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uint64_t lbacnt; /* total amount of sectors */
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uint32_t cyl;
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uint32_t head;
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uint32_t spt;
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};
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struct disk_ebios_dapa {
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uint16_t len;
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uint16_t count;
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uint16_t off;
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uint16_t seg;
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uint64_t lba;
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} __attribute__ ((packed));
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struct disk_ebios_eparam {
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uint16_t len;
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uint16_t info;
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uint32_t cyl;
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uint32_t head;
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uint32_t spt;
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uint64_t lbacnt;
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uint16_t bps; /* bytes per sector */
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uint32_t edd;
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uint16_t dpi_sig;
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uint8_t dpi_len;
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char reserved1[3];
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char hostbus[4];
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char if_type[8];
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char if_path[8];
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char dev_path[8];
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char reserved2;
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uint8_t checksum;
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} __attribute__ ((packed));
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/**
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* CHS (cylinder, head, sector) value extraction macros.
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* Taken from WinVBlock. None expand to an lvalue.
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*/
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#define chs_head(chs) chs[0]
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#define chs_sector(chs) (chs[1] & 0x3F)
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#define chs_cyl_high(chs) (((uint16_t)(chs[1] & 0xC0)) << 2)
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#define chs_cyl_low(chs) ((uint16_t)chs[2])
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#define chs_cylinder(chs) (chs_cyl_high(chs) | chs_cyl_low(chs))
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typedef uint8_t disk_chs[3];
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/* A DOS partition table entry */
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struct disk_dos_part_entry {
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uint8_t active_flag; /* 0x80 if "active" */
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disk_chs start;
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uint8_t ostype;
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disk_chs end;
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uint32_t start_lba;
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uint32_t length;
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} __attribute__ ((packed));
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/* A DOS MBR */
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struct disk_dos_mbr {
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char code[440];
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uint32_t disk_sig;
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char pad[2];
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struct disk_dos_part_entry table[4];
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uint16_t sig;
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} __attribute__ ((packed));
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#define disk_mbr_sig_magic 0xAA55
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/**
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* A GPT disk/partition GUID
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*
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* Be careful with endianness, you must adjust it yourself
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* iff you are directly using the fourth data chunk.
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* There might be a better header for this...
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*/
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struct guid {
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uint32_t data1;
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uint16_t data2;
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uint16_t data3;
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uint64_t data4;
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} __attribute__ ((packed));
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/* A GPT partition */
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struct disk_gpt_part_entry {
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struct guid type;
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struct guid uid;
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uint64_t lba_first;
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uint64_t lba_last;
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uint64_t attribs;
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char name[72];
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} __attribute__ ((packed));
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/* A GPT header */
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struct disk_gpt_header {
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char sig[8];
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union {
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struct {
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uint16_t minor;
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uint16_t major;
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} fields __attribute__ ((packed));
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uint32_t uint32;
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char raw[4];
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} rev __attribute__ ((packed));
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uint32_t hdr_size;
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uint32_t chksum;
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char reserved1[4];
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uint64_t lba_cur;
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uint64_t lba_alt;
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uint64_t lba_first_usable;
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uint64_t lba_last_usable;
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struct guid disk_guid;
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uint64_t lba_table;
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uint32_t part_count;
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uint32_t part_size;
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uint32_t table_chksum;
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char reserved2[1];
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} __attribute__ ((packed));
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static const char disk_gpt_sig_magic[] = "EFI PART";
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extern int disk_int13_retry(const com32sys_t * inreg, com32sys_t * outreg);
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extern int disk_get_params(int disk, struct disk_info *const diskinfo);
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extern void *disk_read_sectors(const struct disk_info *const diskinfo,
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uint64_t lba, uint8_t count);
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extern int disk_write_sectors(const struct disk_info *const diskinfo,
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uint64_t lba, const void *data, uint8_t count);
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extern int disk_write_verify_sectors(const struct disk_info *const diskinfo,
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uint64_t lba, const void *buf, uint8_t count);
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extern void disk_dos_part_dump(const struct disk_dos_part_entry *const part);
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extern void guid_to_str(char *buf, const struct guid *const id);
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extern int str_to_guid(const char *buf, struct guid *const id);
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extern void disk_gpt_part_dump(const struct disk_gpt_part_entry *const
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gpt_part);
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extern void disk_gpt_header_dump(const struct disk_gpt_header *const gpt);
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#endif /* _SYSLINUX_DISK_H */
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