include/grub/i386/pc/biosdisk.h

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2002,2005,2007,2008  Free Software Foundation, Inc.
   4  *
   5  *  GRUB is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #ifndef GRUB_BIOSDISK_MACHINE_HEADER
  20 #define GRUB_BIOSDISK_MACHINE_HEADER    1
  21
  22 #include <grub/symbol.h>
  23 #include <grub/types.h>
  24
  25 #define GRUB_BIOSDISK_FLAG_LBA  1
  26 #define GRUB_BIOSDISK_FLAG_CDROM 2
  27
  28 #define GRUB_BIOSDISK_CDTYPE_NO_EMUL    0
  29 #define GRUB_BIOSDISK_CDTYPE_1_2_M      1
  30 #define GRUB_BIOSDISK_CDTYPE_1_44_M     2
  31 #define GRUB_BIOSDISK_CDTYPE_2_88_M     3
  32 #define GRUB_BIOSDISK_CDTYPE_HARDDISK   4
  33
  34 #define GRUB_BIOSDISK_CDTYPE_MASK       0xF
  35
  36 struct grub_biosdisk_data
  37 {
  38   int drive;
  39   unsigned long cylinders;
  40   unsigned long heads;
  41   unsigned long sectors;
  42   unsigned long flags;
  43 };
  44
  45 /* Drive Parameters.  */
  46 struct grub_biosdisk_drp
  47 {
  48   grub_uint16_t size;
  49   grub_uint16_t flags;
  50   grub_uint32_t cylinders;
  51   grub_uint32_t heads;
  52   grub_uint32_t sectors;
  53   grub_uint64_t total_sectors;
  54   grub_uint16_t bytes_per_sector;
  55   /* ver 2.0 or higher */
  56
  57   union
  58   {
  59     grub_uint32_t EDD_configuration_parameters;
  60
  61     /* Pointer to the Device Parameter Table Extension (ver 3.0+).  */
  62     grub_uint32_t dpte_pointer;
  63   };
  64
  65   /* ver 3.0 or higher */
  66   grub_uint16_t signature_dpi;
  67   grub_uint8_t length_dpi;
  68   grub_uint8_t reserved[3];
  69   grub_uint8_t name_of_host_bus[4];
  70   grub_uint8_t name_of_interface_type[8];
  71   grub_uint8_t interface_path[8];
  72   grub_uint8_t device_path[8];
  73   grub_uint8_t reserved2;
  74   grub_uint8_t checksum;
  75
  76   /* XXX: This is necessary, because the BIOS of Thinkpad X20
  77      writes a garbage to the tail of drive parameters,
  78      regardless of a size specified in a caller.  */
  79   grub_uint8_t dummy[16];
  80 } __attribute__ ((packed));
  81
  82 struct grub_biosdisk_cdrp
  83 {
  84   grub_uint8_t size;
  85   grub_uint8_t media_type;
  86   grub_uint8_t drive_no;
  87   grub_uint8_t controller_no;
  88   grub_uint32_t image_lba;
  89   grub_uint16_t device_spec;
  90   grub_uint16_t cache_seg;
  91   grub_uint16_t load_seg;
  92   grub_uint16_t length_sec512;
  93   grub_uint8_t cylinders;
  94   grub_uint8_t sectors;
  95   grub_uint8_t heads;
  96   grub_uint8_t dummy[16];
  97 } __attribute__ ((packed));
  98
  99 /* Disk Address Packet.  */
 100 struct grub_biosdisk_dap
 101 {
 102   grub_uint8_t length;
 103   grub_uint8_t reserved;
 104   grub_uint16_t blocks;
 105   grub_uint32_t buffer;
 106   grub_uint64_t block;
 107 } __attribute__ ((packed));
 108
 109 int EXPORT_FUNC(grub_biosdisk_rw_int13_extensions) (int ah, int drive, void *dap);
 110 int EXPORT_FUNC(grub_biosdisk_rw_standard) (int ah, int drive, int coff, int hoff,
 111                                int soff, int nsec, int segment);
 112 int EXPORT_FUNC(grub_biosdisk_check_int13_extensions) (int drive);
 113 int EXPORT_FUNC(grub_biosdisk_get_diskinfo_int13_extensions) (int drive,
 114            void *drp);
 115 int EXPORT_FUNC(grub_biosdisk_get_cdinfo_int13_extensions) (int drive,
 116            void *cdrp);
 117 int EXPORT_FUNC(grub_biosdisk_get_diskinfo_standard) (int drive,
 118                                          unsigned long *cylinders,
 119                                          unsigned long *heads,
 120                                          unsigned long *sectors);
 121 int EXPORT_FUNC(grub_biosdisk_get_num_floppies) (void);
 122
 123 void grub_biosdisk_init (void);
 124 void grub_biosdisk_fini (void);
 125
 126 #endif /* ! GRUB_BIOSDISK_MACHINE_HEADER */