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_GUID EfiLegacyBootProtocolGuid     = { 0xdb9a1e3d, 0x45cb, 0x4abb, { 0x85, 0x3b, 0xe5, 0x38, 0x7f, 0xdb, 0x2e, 0x2d }};
  36     EFI_STATUS                Status;
  37     UINT16                       HddCount = 0;
  38     HDD_INFO                     *HddInfo = NULL;
  39     UINT16                       BbsCount = 0;
  40     BBS_TABLE                 *LocalBbsTable = NULL;
  41
  42     Status = gBS->LocateProtocol (&gEfiLegacyBootProtocolGuid, NULL, (VOID **) &LegacyBios);
  43     if (EFI_ERROR (Status)) {
  44       return;
  45     }
  46
  47     Status = LegacyBios->GetBbsInfo (LegacyBios, &HddCount, &HddInfo, &BbsCount, &LocalBbsTable);
  48
  49     //Print (L"\n");
  50     //Print (L" NO  Prio bb/dd/ff cl/sc Type Stat segm:offs\n");
  51     //Print (L"=============================================\n");
  52
  53     for (Idx = 0; Idx < BbsCount; Idx++)
  54     {
  55      if(LocalBbsTable[Idx].DeviceType == 0){
  56         continue;
  57      }
  58
  59      // Set devices of a particular type to BootPriority of 0. I believe 0 is the highest priority
  60      if(LocalBbsTable[Idx].DeviceType == DeviceType){
  61         LocalBbsTable[Idx].BootPriority = 0;
  62      }
  63
  64 /*
  65       Print (
  66         L" %02x: %04x %02x/%02x/%02x %02x/%02x %04x %04x %04x:%04x\n",
  67         (UINTN) Idx,
  68         (UINTN) LocalBbsTable[Idx].BootPriority,
  69         (UINTN) LocalBbsTable[Idx].Bus,
  70         (UINTN) LocalBbsTable[Idx].Device,
  71         (UINTN) LocalBbsTable[Idx].Function,
  72         (UINTN) LocalBbsTable[Idx].Class,
  73         (UINTN) LocalBbsTable[Idx].SubClass,
  74         (UINTN) LocalBbsTable[Idx].DeviceType,
  75         (UINTN) * (UINT16 *) &LocalBbsTable[Idx].StatusFlags,
  76         (UINTN) LocalBbsTable[Idx].BootHandlerSegment,
  77         (UINTN) LocalBbsTable[Idx].BootHandlerOffset,
  78         (UINTN) ((LocalBbsTable[Idx].MfgStringSegment << 4) + LocalBbsTable[Idx].MfgStringOffset),
  79         (UINTN) ((LocalBbsTable[Idx].DescStringSegment << 4) + LocalBbsTable[Idx].DescStringOffset)
  80         );
  81 */
  82     }
  83
  84   //Print(L"\n");
  85 }
  86
  87 // Internal helper function
  88 BOOLEAN ArrayContains(UINT16* Arr, UINT8 ArrLen, UINT8 Target)
  89 {
  90     UINT8 i;
  91     for(i = 0; i < ArrLen; i++)
  92     {
  93        if(Arr[i] == Target)
  94           return TRUE;
  95     }
  96
  97   return FALSE;
  98 }
  99
 100 /**
 101     Boot the legacy system with the boot option
 102
 103     @param  Option                 The legacy boot option which have BBS device path
 104
 105     @retval EFI_UNSUPPORTED        There is no legacybios protocol, do not support
 106                                  legacy boot.
 107     @retval EFI_STATUS             Return the status of LegacyBios->LegacyBoot ().
 108
 109 **/
 110 EFI_STATUS
 111 BdsLibDoLegacyBoot (
 112   IN  BDS_COMMON_OPTION           *Option
 113   )
 114 {
 115     EFI_STATUS                Status;
 116     EFI_LEGACY_BIOS_PROTOCOL  *LegacyBios;
 117     BBS_BBS_DEVICE_PATH *OptionBBS;
 118
 119     Status = gBS->LocateProtocol (&gEfiLegacyBootProtocolGuid, NULL, (VOID **) &LegacyBios);
 120     if (EFI_ERROR (Status)) {
 121       return EFI_UNSUPPORTED;
 122     }
 123     OptionBBS = (BBS_BBS_DEVICE_PATH *) Option->DevicePath;
 124
 125     //Print(L"\n\n");
 126     //Print(L"Option->Name='%s'\n", Option->OptionName);
 127     //Print(L"Option->Number='%d'\n", Option->OptionNumber);
 128     //Print(L"Option->Description='%s'\n", Option->Description);
 129     //Print(L"Option->LoadOptionsSize='%d'\n",Option->LoadOptionsSize);
 130     //Print(L"Option->BootCurrent='%d'\n",Option->BootCurrent);
 131     //Print(L"Option->DevicePath->Type= '%d'\n", Option->DevicePath->Type);
 132     //Print(L"Option->DevicePath->SubType= '%d'\n", Option->DevicePath->SubType);
 133     //Print(L"Option->DevicePath->Length[0]= '%d'\n", Option->DevicePath->Length[0]);
 134     //Print(L"Option->DevicePath->Length[1]= '%d'\n", Option->DevicePath->Length[1]);
 135     //Print(L"OptionBBS->DeviceType='%d'\n",OptionBBS->DeviceType);
 136     //Print(L"OptionBBS->StatusFlag='%d'\n",OptionBBS->StatusFlag);
 137     //Print(L"OptionBBS->String[0]='%c'\n",OptionBBS->String[0]);
 138     //Print(L"About to legacy boot!\n");
 139     //PauseForKey();
 140
 141     UpdateBbsTable(OptionBBS->DeviceType);
 142
 143     return LegacyBios->LegacyBoot (LegacyBios, (BBS_BBS_DEVICE_PATH *) Option->DevicePath, Option->LoadOptionsSize, Option->LoadOptions);
 144 }
 145