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 "../refind/lib.h"
  12 #include "../include/refit_call_wrapper.h"
  13
  14 EFI_GUID gEfiLegacyBootProtocolGuid     = { 0xdb9a1e3d, 0x45cb, 0x4abb, { 0x85, 0x3b, 0xe5, 0x38, 0x7f, 0xdb, 0x2e, 0x2d }};
  15
  16 /**
  17     Internal helper function.
  18
  19     Update the BBS Table so that devices of DeviceType have their boot priority
  20     updated to a high/bootable value.
  21
  22     See "DeviceType values" in
  23     http://www.intel.com/content/dam/doc/reference-guide/efi-compatibility-support-module-specification-v097.pdf
  24
  25     NOTE: This function should probably be refactored! Currently, all devices of
  26     type are enabled. This should be updated so that only a specific device is
  27     enabled. The wrong device could boot if there are multiple targets of the same
  28     type.
  29
  30     @param DeviceType   The device type that we wish to enable
  31 **/
  32 VOID UpdateBbsTable (BDS_COMMON_OPTION *Option) {
  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    BBS_BBS_DEVICE_PATH       *OptionBBS;
  41    CHAR16                    Desc[100];
  42
  43    Status = refit_call3_wrapper(gBS->LocateProtocol, &gEfiLegacyBootProtocolGuid, NULL, (VOID **) &LegacyBios);
  44    if (EFI_ERROR (Status) || (Option == NULL)) {
  45       return;
  46    }
  47
  48    OptionBBS = (BBS_BBS_DEVICE_PATH *) Option->DevicePath;
  49    Status = refit_call5_wrapper(LegacyBios->GetBbsInfo, LegacyBios, &HddCount, &HddInfo, &BbsCount, &LocalBbsTable);
  50
  51 //    Print (L"\n");
  52 //    Print (L" NO  Prio bb/dd/ff cl/sc Type Stat segm:offs\n");
  53 //    Print (L"=============================================\n");
  54
  55    for (Idx = 0; Idx < BbsCount; Idx++) {
  56       if(LocalBbsTable[Idx].DeviceType == 0) {
  57          continue;
  58       }
  59
  60       BdsBuildLegacyDevNameString (&LocalBbsTable[Idx], Idx, sizeof (Desc), Desc);
  61
  62       // Set devices of a particular type to BootPriority of 0 or 1. 0 is the highest priority.
  63       if (LocalBbsTable[Idx].DeviceType == OptionBBS->DeviceType) {
  64          if (MyStriCmp(Desc, Option->Description)) {
  65             // This entry exactly matches what we're looking for; make it highest priority
  66             LocalBbsTable[Idx].BootPriority = 0;
  67          } else {
  68             // This entry doesn't exactly match, but is the right disk type; make it a bit lower
  69             // in priority. Done mainly as a fallback in case of string-matching weirdness.
  70             LocalBbsTable[Idx].BootPriority = 1;
  71          } // if/else
  72       } else if (LocalBbsTable[Idx].BootPriority <= 1) {
  73          // Something's got a high enough boot priority to interfere with booting
  74          // our chosen entry, so bump it down a bit....
  75          LocalBbsTable[Idx].BootPriority = 2;
  76       } // if/else if
  77
  78 //          Print (
  79 //            L" %02x: %04x %02x/%02x/%02x %02x/%02x %04x %04x %04x:%04x\n",
  80 //            (UINTN) Idx,
  81 //            (UINTN) LocalBbsTable[Idx].BootPriority,
  82 //            (UINTN) LocalBbsTable[Idx].Bus,
  83 //            (UINTN) LocalBbsTable[Idx].Device,
  84 //            (UINTN) LocalBbsTable[Idx].Function,
  85 //            (UINTN) LocalBbsTable[Idx].Class,
  86 //            (UINTN) LocalBbsTable[Idx].SubClass,
  87 //            (UINTN) LocalBbsTable[Idx].DeviceType,
  88 //            (UINTN) * (UINT16 *) &LocalBbsTable[Idx].StatusFlags,
  89 //            (UINTN) LocalBbsTable[Idx].BootHandlerSegment,
  90 //            (UINTN) LocalBbsTable[Idx].BootHandlerOffset,
  91 //            (UINTN) ((LocalBbsTable[Idx].MfgStringSegment << 4) + LocalBbsTable[Idx].MfgStringOffset),
  92 //            (UINTN) ((LocalBbsTable[Idx].DescStringSegment << 4) + LocalBbsTable[Idx].DescStringOffset)
  93 //            );
  94 //          Print(L"%s\n", Desc);
  95
  96    } // for
  97 //    PauseForKey();
  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
 118     Status = refit_call3_wrapper(gBS->LocateProtocol, &gEfiLegacyBootProtocolGuid, NULL, (VOID **) &LegacyBios);
 119     if (EFI_ERROR (Status)) {
 120       return EFI_UNSUPPORTED;
 121     }
 122
 123     UpdateBbsTable(Option);
 124
 125     return refit_call4_wrapper(LegacyBios->LegacyBoot, LegacyBios, (BBS_BBS_DEVICE_PATH *) Option->DevicePath,
 126                                   Option->LoadOptionsSize, Option->LoadOptions);
 127 }