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 #include "legacy.h"
  10 #include "../refind/screen.h"
  11
  12 EFI_GUID gEfiLegacyBootProtocolGuid     = { 0xdb9a1e3d, 0x45cb, 0x4abb, { 0x85, 0x3b, 0xe5, 0x38, 0x7f, 0xdb, 0x2e, 0x2d }};
  13
  14 /**
  15     Internal helper function.
  16
  17     Update the BBS Table so that devices of DeviceType have their boot priority
  18     updated to a high/bootable value.
  19
  20     See "DeviceType values" in
  21     http://www.intel.com/content/dam/doc/reference-guide/efi-compatibility-support-module-specification-v097.pdf
  22
  23     NOTE: This function should probably be refactored! Currently, all devices of
  24     type are enabled. This should be updated so that only a specific device is
  25     enabled. The wrong device could boot if there are multiple targets of the same
  26     type.
  27
  28     @param DeviceType   The device type that we wish to enable
  29 **/
  30 VOID UpdateBbsTable (BDS_COMMON_OPTION *Option) {
  31    UINT16  Idx;
  32    EFI_LEGACY_BIOS_PROTOCOL  *LegacyBios;
  33    EFI_STATUS                Status;
  34    UINT16                       HddCount = 0;
  35    HDD_INFO                     *HddInfo = NULL;
  36    UINT16                       BbsCount = 0;
  37    BBS_TABLE                 *LocalBbsTable = NULL;
  38    BBS_BBS_DEVICE_PATH       *OptionBBS;
  39    CHAR16                    Desc[100];
  40
  41    Status = gBS->LocateProtocol (&gEfiLegacyBootProtocolGuid, NULL, (VOID **) &LegacyBios);
  42    if (EFI_ERROR (Status) || (Option == NULL)) {
  43       return;
  44    }
  45
  46    OptionBBS = (BBS_BBS_DEVICE_PATH *) Option->DevicePath;
  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       if(LocalBbsTable[Idx].DeviceType == 0) {
  55          continue;
  56       }
  57
  58       BdsBuildLegacyDevNameString (&LocalBbsTable[Idx], Idx, sizeof (Desc), Desc);
  59
  60       // Set devices of a particular type to BootPriority of 0 or 1. 0 is the highest priority.
  61       if (LocalBbsTable[Idx].DeviceType == OptionBBS->DeviceType) {
  62          if (StriCmp(Desc, Option->Description) == 0) {
  63             // This entry exactly matches what we're looking for; make it highest priority
  64             LocalBbsTable[Idx].BootPriority = 0;
  65          } else {
  66             // This entry doesn't exactly match, but is the right disk type; make it a bit lower
  67             // in priority. Done mainly as a fallback in case of string-matching weirdness.
  68             LocalBbsTable[Idx].BootPriority = 1;
  69          } // if/else
  70       } // if
  71
  72 //          Print (
  73 //            L" %02x: %04x %02x/%02x/%02x %02x/%02x %04x %04x %04x:%04x\n",
  74 //            (UINTN) Idx,
  75 //            (UINTN) LocalBbsTable[Idx].BootPriority,
  76 //            (UINTN) LocalBbsTable[Idx].Bus,
  77 //            (UINTN) LocalBbsTable[Idx].Device,
  78 //            (UINTN) LocalBbsTable[Idx].Function,
  79 //            (UINTN) LocalBbsTable[Idx].Class,
  80 //            (UINTN) LocalBbsTable[Idx].SubClass,
  81 //            (UINTN) LocalBbsTable[Idx].DeviceType,
  82 //            (UINTN) * (UINT16 *) &LocalBbsTable[Idx].StatusFlags,
  83 //            (UINTN) LocalBbsTable[Idx].BootHandlerSegment,
  84 //            (UINTN) LocalBbsTable[Idx].BootHandlerOffset,
  85 //            (UINTN) ((LocalBbsTable[Idx].MfgStringSegment << 4) + LocalBbsTable[Idx].MfgStringOffset),
  86 //            (UINTN) ((LocalBbsTable[Idx].DescStringSegment << 4) + LocalBbsTable[Idx].DescStringOffset)
  87 //            );
  88 //          Print(L"%s\n", Desc);
  89
  90    } // for
  91 }
  92
  93 /**
  94     Boot the legacy system with the boot option
  95
  96     @param  Option                 The legacy boot option which have BBS device path
  97
  98     @retval EFI_UNSUPPORTED        There is no legacybios protocol, do not support
  99                                  legacy boot.
 100     @retval EFI_STATUS             Return the status of LegacyBios->LegacyBoot ().
 101
 102 **/
 103 EFI_STATUS
 104 BdsLibDoLegacyBoot (
 105   IN  BDS_COMMON_OPTION           *Option
 106   )
 107 {
 108     EFI_STATUS                Status;
 109     EFI_LEGACY_BIOS_PROTOCOL  *LegacyBios;
 110
 111     Status = gBS->LocateProtocol (&gEfiLegacyBootProtocolGuid, NULL, (VOID **) &LegacyBios);
 112     if (EFI_ERROR (Status)) {
 113       return EFI_UNSUPPORTED;
 114     }
 115
 116     UpdateBbsTable(Option);
 117
 118     return LegacyBios->LegacyBoot(LegacyBios, (BBS_BBS_DEVICE_PATH *) Option->DevicePath,
 119                                   Option->LoadOptionsSize, Option->LoadOptions);
 120 }