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Diffstat (limited to 'com32/include/syslinux/disk.h')
| -rw-r--r-- | com32/include/syslinux/disk.h | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/com32/include/syslinux/disk.h b/com32/include/syslinux/disk.h new file mode 100644 index 00000000..f96ca686 --- /dev/null +++ b/com32/include/syslinux/disk.h @@ -0,0 +1,180 @@ +/* ----------------------------------------------------------------------- * + * + * 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 */ |