code.delx.au - refind/blob - EfiLib/BdsHelper.c

   1 /*
   2  * EfiLib/BdsHelper.c
   3  * Functions to call legacy BIOS API.
   4  *
   5  */
   6
   7
   8 #include "BdsHelper.h"
   9
  10 EFI_GUID gEfiLegacyBootProtocolGuid     = { 0xdb9a1e3d, 0x45cb, 0x4abb, { 0x85, 0x3b, 0xe5, 0x38, 0x7f, 0xdb, 0x2e, 0x2d }};
  11
  12 /**
  13     Internal helper function.
  14
  15     Update the BBS Table so that devices of DeviceType have their boot priority
  16     updated to a high/bootable value.
  17
  18     See "DeviceType values" in
  19     http://www.intel.com/content/dam/doc/reference-guide/efi-compatibility-support-module-specification-v097.pdf
  20
  21     NOTE: This function should probably be refactored! Currently, all devices of
  22     type are enabled. This should be updated so that only a specific device is
  23     enabled. The wrong device could boot if there are multiple targets of the same
  24     type.
  25
  26     @param DeviceType   The device type that we wish to enable
  27 **/
  28 VOID
  29 UpdateBbsTable (
  30   IN UINT16     DeviceType
  31   )
  32 {
  33     UINT16  Idx;
  34     EFI_LEGACY_BIOS_PROTOCOL  *LegacyBios;
  35     EFI_STATUS                Status;
  36     UINT16                       HddCount = 0;
  37     HDD_INFO                     *HddInfo = NULL;
  38     UINT16                       BbsCount = 0;
  39     BBS_TABLE                 *LocalBbsTable = NULL;
  40
  41     Status = gBS->LocateProtocol (&gEfiLegacyBootProtocolGuid, NULL, (VOID **) &LegacyBios);
  42     if (EFI_ERROR (Status)) {
  43       return;
  44     }
  45
  46     Status = LegacyBios->GetBbsInfo (LegacyBios, &HddCount, &HddInfo, &BbsCount, &LocalBbsTable);
  47
  48     //Print (L"\n");
  49     //Print (L" NO  Prio bb/dd/ff cl/sc Type Stat segm:offs\n");
  50     //Print (L"=============================================\n");
  51
  52     for (Idx = 0; Idx < BbsCount; Idx++)
  53     {
  54      if(LocalBbsTable[Idx].DeviceType == 0){
  55         continue;
  56      }
  57
  58      // Set devices of a particular type to BootPriority of 0. I believe 0 is the highest priority
  59      if(LocalBbsTable[Idx].DeviceType == DeviceType){
  60         LocalBbsTable[Idx].BootPriority = 0;
  61      }
  62
  63 /*
  64       Print (
  65         L" %02x: %04x %02x/%02x/%02x %02x/%02x %04x %04x %04x:%04x\n",
  66         (UINTN) Idx,
  67         (UINTN) LocalBbsTable[Idx].BootPriority,
  68         (UINTN) LocalBbsTable[Idx].Bus,
  69         (UINTN) LocalBbsTable[Idx].Device,
  70         (UINTN) LocalBbsTable[Idx].Function,
  71         (UINTN) LocalBbsTable[Idx].Class,
  72         (UINTN) LocalBbsTable[Idx].SubClass,
  73         (UINTN) LocalBbsTable[Idx].DeviceType,
  74         (UINTN) * (UINT16 *) &LocalBbsTable[Idx].StatusFlags,
  75         (UINTN) LocalBbsTable[Idx].BootHandlerSegment,
  76         (UINTN) LocalBbsTable[Idx].BootHandlerOffset,
  77         (UINTN) ((LocalBbsTable[Idx].MfgStringSegment << 4) + LocalBbsTable[Idx].MfgStringOffset),
  78         (UINTN) ((LocalBbsTable[Idx].DescStringSegment << 4) + LocalBbsTable[Idx].DescStringOffset)
  79         );
  80 */
  81     }
  82
  83   //Print(L"\n");
  84 }
  85
  86 // Internal helper function
  87 // BOOLEAN ArrayContains(UINT16* Arr, UINT8 ArrLen, UINT8 Target)
  88 // {
  89 //     UINT8 i;
  90 //     for(i = 0; i < ArrLen; i++)
  91 //     {
  92 //        if(Arr[i] == Target)
  93 //           return TRUE;
  94 //     }
  95 //
  96 //   return FALSE;
  97 // }
  98
  99 /**
 100     Boot the legacy system with the boot option
 101
 102     @param  Option                 The legacy boot option which have BBS device path
 103
 104     @retval EFI_UNSUPPORTED        There is no legacybios protocol, do not support
 105                                  legacy boot.
 106     @retval EFI_STATUS             Return the status of LegacyBios->LegacyBoot ().
 107
 108 **/
 109 EFI_STATUS
 110 BdsLibDoLegacyBoot (
 111   IN  BDS_COMMON_OPTION           *Option
 112   )
 113 {
 114     EFI_STATUS                Status;
 115     EFI_LEGACY_BIOS_PROTOCOL  *LegacyBios;
 116     BBS_BBS_DEVICE_PATH *OptionBBS;
 117
 118     Status = gBS->LocateProtocol (&gEfiLegacyBootProtocolGuid, NULL, (VOID **) &LegacyBios);
 119     if (EFI_ERROR (Status)) {
 120       return EFI_UNSUPPORTED;
 121     }
 122     OptionBBS = (BBS_BBS_DEVICE_PATH *) Option->DevicePath;
 123
 124 //     Print(L"\n\n");
 125 //     Print(L"Option->Name='%s'\n", Option->OptionName);
 126 //     Print(L"Option->Number='%d'\n", Option->OptionNumber);
 127 //     Print(L"Option->Description='%s'\n", Option->Description);
 128 //     Print(L"Option->LoadOptionsSize='%d'\n",Option->LoadOptionsSize);
 129 //     Print(L"Option->BootCurrent='%d'\n",Option->BootCurrent);
 130 //     Print(L"Option->DevicePath->Type= '%d'\n", Option->DevicePath->Type);
 131 //     Print(L"Option->DevicePath->SubType= '%d'\n", Option->DevicePath->SubType);
 132 //     Print(L"Option->DevicePath->Length[0]= '%d'\n", Option->DevicePath->Length[0]);
 133 //     Print(L"Option->DevicePath->Length[1]= '%d'\n", Option->DevicePath->Length[1]);
 134 //     Print(L"OptionBBS->DeviceType='%d'\n",OptionBBS->DeviceType);
 135 //     Print(L"OptionBBS->StatusFlag='%d'\n",OptionBBS->StatusFlag);
 136 //     Print(L"OptionBBS->String[0]='%s'\n",OptionBBS->String);
 137 //     Print(L"About to legacy boot!\n");
 138 //     PauseForKey();
 139
 140     UpdateBbsTable(OptionBBS->DeviceType);
 141
 142     return LegacyBios->LegacyBoot (LegacyBios, (BBS_BBS_DEVICE_PATH *) Option->DevicePath, Option->LoadOptionsSize, Option->LoadOptions);
 143 }