include/grub/disk.h

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2002,2003,2004,2005,2006,2007,2008  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_DISK_HEADER
  20 #define GRUB_DISK_HEADER        1
  21
  22 #include <grub/symbol.h>
  23 #include <grub/err.h>
  24 #include <grub/types.h>
  25 #include <grub/device.h>
  26
  27 /* These are used to set a device id. When you add a new disk device,
  28    you must define a new id for it here.  */
  29 enum grub_disk_dev_id
  30   {
  31     GRUB_DISK_DEVICE_BIOSDISK_ID,
  32     GRUB_DISK_DEVICE_OFDISK_ID,
  33     GRUB_DISK_DEVICE_LOOPBACK_ID,
  34     GRUB_DISK_DEVICE_EFIDISK_ID,
  35     GRUB_DISK_DEVICE_RAID_ID,
  36     GRUB_DISK_DEVICE_LVM_ID,
  37     GRUB_DISK_DEVICE_HOST_ID,
  38     GRUB_DISK_DEVICE_ATA_ID,
  39     GRUB_DISK_DEVICE_MEMDISK_ID,
  40     GRUB_DISK_DEVICE_NAND_ID,
  41     GRUB_DISK_DEVICE_UUID_ID,
  42     GRUB_DISK_DEVICE_PXE_ID,
  43     GRUB_DISK_DEVICE_SCSI_ID,
  44     GRUB_DISK_DEVICE_FILE_ID,
  45     GRUB_DISK_DEVICE_ZPOOL,
  46   };
  47
  48 struct grub_disk;
  49 #ifdef GRUB_UTIL
  50 struct grub_disk_memberlist;
  51 #endif
  52
  53 /* Disk device.  */
  54 struct grub_disk_dev
  55 {
  56   /* The device name.  */
  57   const char *name;
  58
  59   /* The device id used by the cache manager.  */
  60   enum grub_disk_dev_id id;
  61
  62   /* Call HOOK with each device name, until HOOK returns non-zero.  */
  63   int (*iterate) (int (*hook) (const char *name));
  64
  65   /* Open the device named NAME, and set up DISK.  */
  66   grub_err_t (*open) (const char *name, struct grub_disk *disk);
  67
  68   /* Close the disk DISK.  */
  69   void (*close) (struct grub_disk *disk);
  70
  71   /* Read SIZE sectors from the sector SECTOR of the disk DISK into BUF.  */
  72   grub_err_t (*read) (struct grub_disk *disk, grub_disk_addr_t sector,
  73                       grub_size_t size, char *buf);
  74
  75   /* Write SIZE sectors from BUF into the sector SECTOR of the disk DISK.  */
  76   grub_err_t (*write) (struct grub_disk *disk, grub_disk_addr_t sector,
  77                        grub_size_t size, const char *buf);
  78
  79 #ifdef GRUB_UTIL
  80   struct grub_disk_memberlist *(*memberlist) (struct grub_disk *disk);
  81 #endif
  82
  83   /* The next disk device.  */
  84   struct grub_disk_dev *next;
  85 };
  86 typedef struct grub_disk_dev *grub_disk_dev_t;
  87
  88 struct grub_partition;
  89
  90 /* Disk.  */
  91 struct grub_disk
  92 {
  93   /* The disk name.  */
  94   const char *name;
  95
  96   /* The underlying disk device.  */
  97   grub_disk_dev_t dev;
  98
  99   /* The total number of sectors.  */
 100   grub_uint64_t total_sectors;
 101
 102   /* If partitions can be stored.  */
 103   int has_partitions;
 104
 105   /* The id used by the disk cache manager.  */
 106   unsigned long id;
 107
 108   /* The partition information. This is machine-specific.  */
 109   struct grub_partition *partition;
 110
 111   /* Called when a sector was read. OFFSET is between 0 and
 112      the sector size minus 1, and LENGTH is between 0 and the sector size.  */
 113   void NESTED_FUNC_ATTR (*read_hook) (grub_disk_addr_t sector,
 114                      unsigned offset, unsigned length);
 115
 116   /* Device-specific data.  */
 117   void *data;
 118 };
 119 typedef struct grub_disk *grub_disk_t;
 120
 121 #ifdef GRUB_UTIL
 122 struct grub_disk_memberlist
 123 {
 124   grub_disk_t disk;
 125   struct grub_disk_memberlist *next;
 126 };
 127 typedef struct grub_disk_memberlist *grub_disk_memberlist_t;
 128 #endif
 129
 130 /* The sector size.  */
 131 #define GRUB_DISK_SECTOR_SIZE   0x200
 132 #define GRUB_DISK_SECTOR_BITS   9
 133
 134 /* The maximum number of disk caches.  */
 135 #define GRUB_DISK_CACHE_NUM     1021
 136
 137 /* The size of a disk cache in sector units.  */
 138 #define GRUB_DISK_CACHE_SIZE    8
 139 #define GRUB_DISK_CACHE_BITS    3
 140
 141 /* This is called from the memory manager.  */
 142 void grub_disk_cache_invalidate_all (void);
 143
 144 void EXPORT_FUNC(grub_disk_dev_register) (grub_disk_dev_t dev);
 145 void EXPORT_FUNC(grub_disk_dev_unregister) (grub_disk_dev_t dev);
 146 int EXPORT_FUNC(grub_disk_dev_iterate) (int (*hook) (const char *name));
 147
 148 grub_disk_t EXPORT_FUNC(grub_disk_open) (const char *name);
 149 void EXPORT_FUNC(grub_disk_close) (grub_disk_t disk);
 150 grub_err_t EXPORT_FUNC(grub_disk_read) (grub_disk_t disk,
 151                                         grub_disk_addr_t sector,
 152                                         grub_off_t offset,
 153                                         grub_size_t size,
 154                                         void *buf);
 155 grub_err_t EXPORT_FUNC(grub_disk_write) (grub_disk_t disk,
 156                                          grub_disk_addr_t sector,
 157                                          grub_off_t offset,
 158                                          grub_size_t size,
 159                                          const void *buf);
 160
 161 grub_uint64_t EXPORT_FUNC(grub_disk_get_size) (grub_disk_t disk);
 162
 163 extern void (* EXPORT_VAR(grub_disk_firmware_fini)) (void);
 164 extern int EXPORT_VAR(grub_disk_firmware_is_tainted);
 165
 166 /* ATA pass through parameters and function.  */
 167 struct grub_disk_ata_pass_through_parms
 168 {
 169   grub_uint8_t taskfile[8];
 170   void * buffer;
 171   int size;
 172 };
 173
 174 extern grub_err_t (* EXPORT_VAR(grub_disk_ata_pass_through)) (grub_disk_t,
 175                    struct grub_disk_ata_pass_through_parms *);
 176
 177 #endif /* ! GRUB_DISK_HEADER */