source: bootcd/isolinux/syslinux-6.03/com32/include/syslinux/disk.h @ e16e8f2

Last change on this file since e16e8f2 was e16e8f2, checked in by Edwin Eefting <edwin@datux.nl>, 3 years ago

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1/* ----------------------------------------------------------------------- *
2 *
3 *   Copyright 2003-2009 H. Peter Anvin - All Rights Reserved
4 *   Copyright 2009-2010 Intel Corporation; author: H. Peter Anvin
5 *   Copyright (C) 2010 Shao Miller
6 *
7 *   Permission is hereby granted, free of charge, to any person
8 *   obtaining a copy of this software and associated documentation
9 *   files (the "Software"), to deal in the Software without
10 *   restriction, including without limitation the rights to use,
11 *   copy, modify, merge, publish, distribute, sublicense, and/or
12 *   sell copies of the Software, and to permit persons to whom
13 *   the Software is furnished to do so, subject to the following
14 *   conditions:
15 *
16 *   The above copyright notice and this permission notice shall
17 *   be included in all copies or substantial portions of the Software.
18 *
19 *   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
20 *   EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
21 *   OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
22 *   NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
23 *   HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
24 *   WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
25 *   FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
26 *   OTHER DEALINGS IN THE SOFTWARE.
27 *
28 * ----------------------------------------------------------------------- */
29
30/**
31 * @file syslinux/disk.h
32 *
33 * Deal with disks and partitions
34 */
35
36#ifndef _SYSLINUX_DISK_H
37#define _SYSLINUX_DISK_H
38
39#include <com32.h>
40#include <stdint.h>
41
42#define SECTOR 512u             /* bytes/sector */
43
44enum disk_op_codes {
45    EBIOS_READ_CODE = 0x42, /* Extended read */
46    EBIOS_WRITE_CODE = 0x43, /* Extended write */
47    CHS_READ_CODE = 0x02,
48    CHS_WRITE_CODE = 0x03,
49};
50
51struct disk_info {
52    int disk;
53    int ebios;                  /* EBIOS supported on this disk */
54    int cbios;                  /* CHS geometry is valid */
55    uint32_t bps;               /* bytes per sector */
56    uint64_t lbacnt;            /* total amount of sectors */
57    uint32_t cyl;
58    uint32_t head;
59    uint32_t spt;
60};
61
62struct disk_ebios_dapa {
63    uint16_t len;
64    uint16_t count;
65    uint16_t off;
66    uint16_t seg;
67    uint64_t lba;
68} __attribute__ ((packed));
69
70struct disk_ebios_eparam {
71    uint16_t len;
72    uint16_t info;
73    uint32_t cyl;
74    uint32_t head;
75    uint32_t spt;
76    uint64_t lbacnt;
77    uint16_t bps;       /* bytes per sector */
78    uint32_t edd;
79    uint16_t dpi_sig;
80    uint8_t  dpi_len;
81    char     reserved1[3];
82    char     hostbus[4];
83    char     if_type[8];
84    char     if_path[8];
85    char     dev_path[8];
86    char     reserved2;
87    uint8_t  checksum;
88} __attribute__ ((packed));
89
90/**
91 * CHS (cylinder, head, sector) value extraction macros.
92 * Taken from WinVBlock.  None expand to an lvalue.
93*/
94#define     chs_head(chs) chs[0]
95#define   chs_sector(chs) (chs[1] & 0x3F)
96#define chs_cyl_high(chs) (((uint16_t)(chs[1] & 0xC0)) << 2)
97#define  chs_cyl_low(chs) ((uint16_t)chs[2])
98#define chs_cylinder(chs) (chs_cyl_high(chs) | chs_cyl_low(chs))
99typedef uint8_t disk_chs[3];
100
101/* A DOS partition table entry */
102struct disk_dos_part_entry {
103    uint8_t active_flag;        /* 0x80 if "active" */
104    disk_chs start;
105    uint8_t ostype;
106    disk_chs end;
107    uint32_t start_lba;
108    uint32_t length;
109} __attribute__ ((packed));
110
111/* A DOS MBR */
112struct disk_dos_mbr {
113    char code[440];
114    uint32_t disk_sig;
115    char pad[2];
116    struct disk_dos_part_entry table[4];
117    uint16_t sig;
118} __attribute__ ((packed));
119#define disk_mbr_sig_magic 0xAA55
120
121/**
122 * A GPT disk/partition GUID
123 *
124 * Be careful with endianness, you must adjust it yourself
125 * iff you are directly using the fourth data chunk.
126 * There might be a better header for this...
127 */
128struct guid {
129    uint32_t data1;
130    uint16_t data2;
131    uint16_t data3;
132    uint64_t data4;
133} __attribute__ ((packed));
134
135/* A GPT partition */
136struct disk_gpt_part_entry {
137    struct guid type;
138    struct guid uid;
139    uint64_t lba_first;
140    uint64_t lba_last;
141    uint64_t attribs;
142    char name[72];
143} __attribute__ ((packed));
144
145/* A GPT header */
146struct disk_gpt_header {
147    char sig[8];
148    union {
149        struct {
150            uint16_t minor;
151            uint16_t major;
152        } fields __attribute__ ((packed));
153        uint32_t uint32;
154        char raw[4];
155    } rev __attribute__ ((packed));
156    uint32_t hdr_size;
157    uint32_t chksum;
158    char reserved1[4];
159    uint64_t lba_cur;
160    uint64_t lba_alt;
161    uint64_t lba_first_usable;
162    uint64_t lba_last_usable;
163    struct guid disk_guid;
164    uint64_t lba_table;
165    uint32_t part_count;
166    uint32_t part_size;
167    uint32_t table_chksum;
168    char reserved2[1];
169} __attribute__ ((packed));
170static const char disk_gpt_sig_magic[] = "EFI PART";
171
172extern int disk_int13_retry(const com32sys_t * inreg, com32sys_t * outreg);
173extern int disk_get_params(int disk, struct disk_info *const diskinfo);
174extern void *disk_read_sectors(const struct disk_info *const diskinfo,
175                               uint64_t lba, uint8_t count);
176extern int disk_write_sectors(const struct disk_info *const diskinfo,
177                              uint64_t lba, const void *data, uint8_t count);
178extern int disk_write_verify_sectors(const struct disk_info *const diskinfo,
179                                     uint64_t lba, const void *buf, uint8_t count);
180extern void disk_dos_part_dump(const struct disk_dos_part_entry *const part);
181extern void guid_to_str(char *buf, const struct guid *const id);
182extern int str_to_guid(const char *buf, struct guid *const id);
183extern void disk_gpt_part_dump(const struct disk_gpt_part_entry *const
184                               gpt_part);
185extern void disk_gpt_header_dump(const struct disk_gpt_header *const gpt);
186
187#endif /* _SYSLINUX_DISK_H */
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