edd.h 5.5 KB

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  1. /*
  2. * linux/include/linux/edd.h
  3. * Copyright (C) 2002, 2003, 2004 Dell Inc.
  4. * by Matt Domsch <Matt_Domsch@dell.com>
  5. *
  6. * structures and definitions for the int 13h, ax={41,48}h
  7. * BIOS Enhanced Disk Drive Services
  8. * This is based on the T13 group document D1572 Revision 0 (August 14 2002)
  9. * available at http://www.t13.org/docs2002/d1572r0.pdf. It is
  10. * very similar to D1484 Revision 3 http://www.t13.org/docs2002/d1484r3.pdf
  11. *
  12. * In a nutshell, arch/{i386,x86_64}/boot/setup.S populates a scratch
  13. * table in the boot_params that contains a list of BIOS-enumerated
  14. * boot devices.
  15. * In arch/{i386,x86_64}/kernel/setup.c, this information is
  16. * transferred into the edd structure, and in drivers/firmware/edd.c, that
  17. * information is used to identify BIOS boot disk. The code in setup.S
  18. * is very sensitive to the size of these structures.
  19. *
  20. * This program is free software; you can redistribute it and/or modify
  21. * it under the terms of the GNU General Public License v2.0 as published by
  22. * the Free Software Foundation
  23. *
  24. * This program is distributed in the hope that it will be useful,
  25. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  26. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  27. * GNU General Public License for more details.
  28. *
  29. */
  30. #ifndef _LINUX_EDD_H
  31. #define _LINUX_EDD_H
  32. #define EDDNR 0x1e9 /* addr of number of edd_info structs at EDDBUF
  33. in boot_params - treat this as 1 byte */
  34. #define EDDBUF 0xd00 /* addr of edd_info structs in boot_params */
  35. #define EDDMAXNR 6 /* number of edd_info structs starting at EDDBUF */
  36. #define EDDEXTSIZE 8 /* change these if you muck with the structures */
  37. #define EDDPARMSIZE 74
  38. #define CHECKEXTENSIONSPRESENT 0x41
  39. #define GETDEVICEPARAMETERS 0x48
  40. #define LEGACYGETDEVICEPARAMETERS 0x08
  41. #define EDDMAGIC1 0x55AA
  42. #define EDDMAGIC2 0xAA55
  43. #define READ_SECTORS 0x02 /* int13 AH=0x02 is READ_SECTORS command */
  44. #define EDD_MBR_SIG_OFFSET 0x1B8 /* offset of signature in the MBR */
  45. #define EDD_MBR_SIG_BUF 0x290 /* addr in boot params */
  46. #define EDD_MBR_SIG_MAX 16 /* max number of signatures to store */
  47. #define EDD_MBR_SIG_NR_BUF 0x1ea /* addr of number of MBR signtaures at EDD_MBR_SIG_BUF
  48. in boot_params - treat this as 1 byte */
  49. #define EDD_CL_EQUALS 0x3d646465 /* "edd=" */
  50. #define EDD_CL_OFF 0x666f /* "of" for off */
  51. #define EDD_CL_SKIP 0x6b73 /* "sk" for skipmbr */
  52. #define EDD_CL_ON 0x6e6f /* "on" for on */
  53. #ifndef __ASSEMBLY__
  54. #define EDD_EXT_FIXED_DISK_ACCESS (1 << 0)
  55. #define EDD_EXT_DEVICE_LOCKING_AND_EJECTING (1 << 1)
  56. #define EDD_EXT_ENHANCED_DISK_DRIVE_SUPPORT (1 << 2)
  57. #define EDD_EXT_64BIT_EXTENSIONS (1 << 3)
  58. #define EDD_INFO_DMA_BOUNDARY_ERROR_TRANSPARENT (1 << 0)
  59. #define EDD_INFO_GEOMETRY_VALID (1 << 1)
  60. #define EDD_INFO_REMOVABLE (1 << 2)
  61. #define EDD_INFO_WRITE_VERIFY (1 << 3)
  62. #define EDD_INFO_MEDIA_CHANGE_NOTIFICATION (1 << 4)
  63. #define EDD_INFO_LOCKABLE (1 << 5)
  64. #define EDD_INFO_NO_MEDIA_PRESENT (1 << 6)
  65. #define EDD_INFO_USE_INT13_FN50 (1 << 7)
  66. struct edd_device_params {
  67. u16 length;
  68. u16 info_flags;
  69. u32 num_default_cylinders;
  70. u32 num_default_heads;
  71. u32 sectors_per_track;
  72. u64 number_of_sectors;
  73. u16 bytes_per_sector;
  74. u32 dpte_ptr; /* 0xFFFFFFFF for our purposes */
  75. u16 key; /* = 0xBEDD */
  76. u8 device_path_info_length; /* = 44 */
  77. u8 reserved2;
  78. u16 reserved3;
  79. u8 host_bus_type[4];
  80. u8 interface_type[8];
  81. union {
  82. struct {
  83. u16 base_address;
  84. u16 reserved1;
  85. u32 reserved2;
  86. } __attribute__ ((packed)) isa;
  87. struct {
  88. u8 bus;
  89. u8 slot;
  90. u8 function;
  91. u8 channel;
  92. u32 reserved;
  93. } __attribute__ ((packed)) pci;
  94. /* pcix is same as pci */
  95. struct {
  96. u64 reserved;
  97. } __attribute__ ((packed)) ibnd;
  98. struct {
  99. u64 reserved;
  100. } __attribute__ ((packed)) xprs;
  101. struct {
  102. u64 reserved;
  103. } __attribute__ ((packed)) htpt;
  104. struct {
  105. u64 reserved;
  106. } __attribute__ ((packed)) unknown;
  107. } interface_path;
  108. union {
  109. struct {
  110. u8 device;
  111. u8 reserved1;
  112. u16 reserved2;
  113. u32 reserved3;
  114. u64 reserved4;
  115. } __attribute__ ((packed)) ata;
  116. struct {
  117. u8 device;
  118. u8 lun;
  119. u8 reserved1;
  120. u8 reserved2;
  121. u32 reserved3;
  122. u64 reserved4;
  123. } __attribute__ ((packed)) atapi;
  124. struct {
  125. u16 id;
  126. u64 lun;
  127. u16 reserved1;
  128. u32 reserved2;
  129. } __attribute__ ((packed)) scsi;
  130. struct {
  131. u64 serial_number;
  132. u64 reserved;
  133. } __attribute__ ((packed)) usb;
  134. struct {
  135. u64 eui;
  136. u64 reserved;
  137. } __attribute__ ((packed)) i1394;
  138. struct {
  139. u64 wwid;
  140. u64 lun;
  141. } __attribute__ ((packed)) fibre;
  142. struct {
  143. u64 identity_tag;
  144. u64 reserved;
  145. } __attribute__ ((packed)) i2o;
  146. struct {
  147. u32 array_number;
  148. u32 reserved1;
  149. u64 reserved2;
  150. } __attribute__ ((packed)) raid;
  151. struct {
  152. u8 device;
  153. u8 reserved1;
  154. u16 reserved2;
  155. u32 reserved3;
  156. u64 reserved4;
  157. } __attribute__ ((packed)) sata;
  158. struct {
  159. u64 reserved1;
  160. u64 reserved2;
  161. } __attribute__ ((packed)) unknown;
  162. } device_path;
  163. u8 reserved4;
  164. u8 checksum;
  165. } __attribute__ ((packed));
  166. struct edd_info {
  167. u8 device;
  168. u8 version;
  169. u16 interface_support;
  170. u16 legacy_max_cylinder;
  171. u8 legacy_max_head;
  172. u8 legacy_sectors_per_track;
  173. struct edd_device_params params;
  174. } __attribute__ ((packed));
  175. struct edd {
  176. unsigned int mbr_signature[EDD_MBR_SIG_MAX];
  177. struct edd_info edd_info[EDDMAXNR];
  178. unsigned char mbr_signature_nr;
  179. unsigned char edd_info_nr;
  180. };
  181. extern struct edd edd;
  182. #endif /*!__ASSEMBLY__ */
  183. #endif /* _LINUX_EDD_H */