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  1. /*++
  2.  
  3. Copyright (c) 1999 Intel Corporation
  4.  
  5. Module Name:
  6.  
  7.     legacyboot
  8.  
  9. Abstract:
  10.  
  11.     EFI support for legacy boot
  12.  
  13.  
  14.  
  15. Revision History
  16.  
  17. --*/
  18.  
  19. #ifndef _LEGACY_BOOT_INCLUDE_
  20. #define _LEGACY_BOOT_INCLUDE_
  21.  
  22. #define LEGACY_BOOT_PROTOCOL \
  23.     { 0x376e5eb2, 0x30e4, 0x11d3, { 0xba, 0xe5, 0x0, 0x80, 0xc7, 0x3c, 0x88, 0x81 } }
  24.  
  25. #pragma pack(1)
  26.  
  27. //
  28. // BBS 1.01 (See Appendix A) IPL and BCV Table Entry Data structure.
  29. //  Seg:Off pointers have been converted to EFI pointers in this data structure
  30. //  This is the structure that also maps to the EFI device path for the boot selection
  31. //
  32. typedef struct {
  33.     UINT16  DeviceType;
  34.     UINT16  StatusFlag;
  35.     UINT32  Reserved;
  36.     VOID    *BootHandler;   // Not an EFI entry point
  37.     CHAR8   *DescString;
  38. } BBS_TABLE_ENTRY;
  39. #pragma pack()
  40.  
  41. typedef
  42. EFI_STATUS
  43. (EFIAPI *LEGACY_BOOT_CALL) (
  44.     IN EFI_DEVICE_PATH      *DevicePath
  45.     );
  46.  
  47.  
  48. //
  49. // BBS support functions
  50. //  PnP Call numbers and BiosSelector hidden in implementation
  51. //
  52.  
  53. typedef enum {
  54.     IplRelative,
  55.     BcvRelative
  56. } BBS_TYPE;
  57.  
  58. INTERFACE_DECL(_LEGACY_BOOT_INTERFACE);
  59.  
  60. //
  61. // == PnP Function 0x60 then BbsVersion == 0x0101 if this call fails then BbsVersion == 0x0000
  62. //
  63.  
  64. //
  65. // == PnP Function 0x61
  66. //
  67. typedef
  68. EFI_STATUS
  69. (EFIAPI *GET_DEVICE_COUNT) (
  70.     IN  struct _LEGACY_BOOT_INTERFACE   *This,
  71.     IN  BBS_TYPE        *TableType,
  72.     OUT UINTN           *DeviceCount,
  73.     OUT UINTN           *MaxCount
  74.     );
  75.  
  76. //
  77. // == PnP Function 0x62
  78. //
  79. typedef
  80. EFI_STATUS
  81. (EFIAPI *GET_PRIORITY_AND_TABLE) (
  82.     IN  struct _LEGACY_BOOT_INTERFACE   *This,
  83.     IN  BBS_TYPE        *TableType,
  84.     IN OUT  UINTN       *PrioritySize, // MaxCount * sizeof(UINT8)
  85.     OUT     UINTN       *Priority,
  86.     IN OUT  UINTN       *TableSize,    // MaxCount * sizeof(BBS_TABLE_ENTRY)
  87.     OUT BBS_TABLE_ENTRY *TableEntrySize
  88.     );
  89.  
  90. //
  91. // == PnP Function 0x63
  92. //
  93. typedef
  94. EFI_STATUS
  95. (EFIAPI *SET_PRIORITY) (
  96.     IN  struct _LEGACY_BOOT_INTERFACE   *This,
  97.     IN  BBS_TYPE        *TableType,
  98.     IN OUT  UINTN       *PrioritySize,
  99.     OUT     UINTN       *Priority
  100.     );
  101.  
  102. typedef struct _LEGACY_BOOT_INTERFACE {
  103.     LEGACY_BOOT_CALL    BootIt;
  104.  
  105.     //
  106.     // New functions to allow BBS booting to be configured from EFI
  107.     //
  108.     UINTN                   BbsVersion;     // Currently 0x0101
  109.     GET_DEVICE_COUNT        GetDeviceCount;
  110.     GET_PRIORITY_AND_TABLE  GetPriorityAndTable;
  111.     SET_PRIORITY            SetPriority;  
  112. } LEGACY_BOOT_INTERFACE;
  113.  
  114. EFI_STATUS
  115. PlInitializeLegacyBoot (
  116.     VOID
  117.     );
  118.  
  119. #endif
  120.