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 #include "refit_call_wrapper.h"
  12
  13 EFI_GUID gEfiLegacyBootProtocolGuid     = { 0xdb9a1e3d, 0x45cb, 0x4abb, { 0x85, 0x3b, 0xe5, 0x38, 0x7f, 0xdb, 0x2e, 0x2d }};
  14
  15 /**
  16     Internal helper function.
  17
  18     Update the BBS Table so that devices of DeviceType have their boot priority
  19     updated to a high/bootable value.
  20
  21     See "DeviceType values" in
  22     http://www.intel.com/content/dam/doc/reference-guide/efi-compatibility-support-module-specification-v097.pdf
  23
  24     NOTE: This function should probably be refactored! Currently, all devices of
  25     type are enabled. This should be updated so that only a specific device is
  26     enabled. The wrong device could boot if there are multiple targets of the same
  27     type.
  28
  29     @param DeviceType   The device type that we wish to enable
  30 **/
  31 VOID UpdateBbsTable (BDS_COMMON_OPTION *Option) {
  32    UINT16  Idx;
  33    EFI_LEGACY_BIOS_PROTOCOL  *LegacyBios;
  34    EFI_STATUS                Status;
  35    UINT16                       HddCount = 0;
  36    HDD_INFO                     *HddInfo = NULL;
  37    UINT16                       BbsCount = 0;
  38    BBS_TABLE                 *LocalBbsTable = NULL;
  39    BBS_BBS_DEVICE_PATH       *OptionBBS;
  40    CHAR16                    Desc[100];
  41
  42    Status = refit_call3_wrapper(gBS->LocateProtocol, &gEfiLegacyBootProtocolGuid, NULL, (VOID **) &LegacyBios);
  43    if (EFI_ERROR (Status) || (Option == NULL)) {
  44       return;
  45    }
  46
  47    OptionBBS = (BBS_BBS_DEVICE_PATH *) Option->DevicePath;
  48    Status = refit_call5_wrapper(LegacyBios->GetBbsInfo, LegacyBios, &HddCount, &HddInfo, &BbsCount, &LocalBbsTable);
  49
  50 //    Print (L"\n");
  51 //    Print (L" NO  Prio bb/dd/ff cl/sc Type Stat segm:offs\n");
  52 //    Print (L"=============================================\n");
  53
  54    for (Idx = 0; Idx < BbsCount; Idx++) {
  55       if(LocalBbsTable[Idx].DeviceType == 0) {
  56          continue;
  57       }
  58
  59       BdsBuildLegacyDevNameString (&LocalBbsTable[Idx], Idx, sizeof (Desc), Desc);
  60
  61       // Set devices of a particular type to BootPriority of 0 or 1. 0 is the highest priority.
  62       if (LocalBbsTable[Idx].DeviceType == OptionBBS->DeviceType) {
  63          if (StriCmp(Desc, Option->Description) == 0) {
  64             // This entry exactly matches what we're looking for; make it highest priority
  65             LocalBbsTable[Idx].BootPriority = 0;
  66          } else {
  67             // This entry doesn't exactly match, but is the right disk type; make it a bit lower
  68             // in priority. Done mainly as a fallback in case of string-matching weirdness.
  69             LocalBbsTable[Idx].BootPriority = 1;
  70          } // if/else
  71       } else if (LocalBbsTable[Idx].BootPriority <= 1) {
  72          // Something's got a high enough boot priority to interfere with booting
  73          // our chosen entry, so bump it down a bit....
  74          LocalBbsTable[Idx].BootPriority = 2;
  75       } // if/else if
  76
  77 //          Print (
  78 //            L" %02x: %04x %02x/%02x/%02x %02x/%02x %04x %04x %04x:%04x\n",
  79 //            (UINTN) Idx,
  80 //            (UINTN) LocalBbsTable[Idx].BootPriority,
  81 //            (UINTN) LocalBbsTable[Idx].Bus,
  82 //            (UINTN) LocalBbsTable[Idx].Device,
  83 //            (UINTN) LocalBbsTable[Idx].Function,
  84 //            (UINTN) LocalBbsTable[Idx].Class,
  85 //            (UINTN) LocalBbsTable[Idx].SubClass,
  86 //            (UINTN) LocalBbsTable[Idx].DeviceType,
  87 //            (UINTN) * (UINT16 *) &LocalBbsTable[Idx].StatusFlags,
  88 //            (UINTN) LocalBbsTable[Idx].BootHandlerSegment,
  89 //            (UINTN) LocalBbsTable[Idx].BootHandlerOffset,
  90 //            (UINTN) ((LocalBbsTable[Idx].MfgStringSegment << 4) + LocalBbsTable[Idx].MfgStringOffset),
  91 //            (UINTN) ((LocalBbsTable[Idx].DescStringSegment << 4) + LocalBbsTable[Idx].DescStringOffset)
  92 //            );
  93 //          Print(L"%s\n", Desc);
  94
  95    } // for
  96 //    PauseForKey();
  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
 117     Status = refit_call3_wrapper(gBS->LocateProtocol, &gEfiLegacyBootProtocolGuid, NULL, (VOID **) &LegacyBios);
 118     if (EFI_ERROR (Status)) {
 119       return EFI_UNSUPPORTED;
 120     }
 121
 122     UpdateBbsTable(Option);
 123
 124     return refit_call4_wrapper(LegacyBios->LegacyBoot, LegacyBios, (BBS_BBS_DEVICE_PATH *) Option->DevicePath,
 125                                   Option->LoadOptionsSize, Option->LoadOptions);
 126 }