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 "mystrings.h"
  11 #include "../refind/screen.h"
  12 #include "../refind/lib.h"
  13 #include "../include/refit_call_wrapper.h"
  14
  15 EFI_GUID gEfiLegacyBootProtocolGuid     = { 0xdb9a1e3d, 0x45cb, 0x4abb, { 0x85, 0x3b, 0xe5, 0x38, 0x7f, 0xdb, 0x2e, 0x2d }};
  16
  17 /**
  18     Internal helper function.
  19
  20     Update the BBS Table so that devices of DeviceType have their boot priority
  21     updated to a high/bootable value.
  22
  23     See "DeviceType values" in
  24     http://www.intel.com/content/dam/doc/reference-guide/efi-compatibility-support-module-specification-v097.pdf
  25
  26     NOTE: This function should probably be refactored! Currently, all devices of
  27     type are enabled. This should be updated so that only a specific device is
  28     enabled. The wrong device could boot if there are multiple targets of the same
  29     type.
  30
  31     @param DeviceType   The device type that we wish to enable
  32 **/
  33 VOID UpdateBbsTable (BDS_COMMON_OPTION *Option) {
  34    UINT16  Idx;
  35    EFI_LEGACY_BIOS_PROTOCOL  *LegacyBios;
  36    EFI_STATUS                Status;
  37    UINT16                       HddCount = 0;
  38    HDD_INFO                     *HddInfo = NULL;
  39    UINT16                       BbsCount = 0;
  40    BBS_TABLE                 *LocalBbsTable = NULL;
  41    BBS_BBS_DEVICE_PATH       *OptionBBS;
  42    CHAR16                    Desc[100];
  43
  44    Status = refit_call3_wrapper(gBS->LocateProtocol, &gEfiLegacyBootProtocolGuid, NULL, (VOID **) &LegacyBios);
  45    if (EFI_ERROR (Status) || (Option == NULL)) {
  46       return;
  47    }
  48
  49    OptionBBS = (BBS_BBS_DEVICE_PATH *) Option->DevicePath;
  50    Status = refit_call5_wrapper(LegacyBios->GetBbsInfo, LegacyBios, &HddCount, &HddInfo, &BbsCount, &LocalBbsTable);
  51
  52 //    Print (L"\n");
  53 //    Print (L" NO  Prio bb/dd/ff cl/sc Type Stat segm:offs\n");
  54 //    Print (L"=============================================\n");
  55
  56    for (Idx = 0; Idx < BbsCount; Idx++) {
  57       if(LocalBbsTable[Idx].DeviceType == 0) {
  58          continue;
  59       }
  60
  61       BdsBuildLegacyDevNameString (&LocalBbsTable[Idx], Idx, sizeof (Desc), Desc);
  62
  63       // Set devices of a particular type to BootPriority of 0 or 1. 0 is the highest priority.
  64       if (LocalBbsTable[Idx].DeviceType == OptionBBS->DeviceType) {
  65          if (MyStriCmp(Desc, Option->Description)) {
  66             // This entry exactly matches what we're looking for; make it highest priority
  67             LocalBbsTable[Idx].BootPriority = 0;
  68          } else {
  69             // This entry doesn't exactly match, but is the right disk type; make it a bit lower
  70             // in priority. Done mainly as a fallback in case of string-matching weirdness.
  71             LocalBbsTable[Idx].BootPriority = 1;
  72          } // if/else
  73       } else if (LocalBbsTable[Idx].BootPriority <= 1) {
  74          // Something's got a high enough boot priority to interfere with booting
  75          // our chosen entry, so bump it down a bit....
  76          LocalBbsTable[Idx].BootPriority = 2;
  77       } // if/else if
  78
  79 //          Print (
  80 //            L" %02x: %04x %02x/%02x/%02x %02x/%02x %04x %04x %04x:%04x\n",
  81 //            (UINTN) Idx,
  82 //            (UINTN) LocalBbsTable[Idx].BootPriority,
  83 //            (UINTN) LocalBbsTable[Idx].Bus,
  84 //            (UINTN) LocalBbsTable[Idx].Device,
  85 //            (UINTN) LocalBbsTable[Idx].Function,
  86 //            (UINTN) LocalBbsTable[Idx].Class,
  87 //            (UINTN) LocalBbsTable[Idx].SubClass,
  88 //            (UINTN) LocalBbsTable[Idx].DeviceType,
  89 //            (UINTN) * (UINT16 *) &LocalBbsTable[Idx].StatusFlags,
  90 //            (UINTN) LocalBbsTable[Idx].BootHandlerSegment,
  91 //            (UINTN) LocalBbsTable[Idx].BootHandlerOffset,
  92 //            (UINTN) ((LocalBbsTable[Idx].MfgStringSegment << 4) + LocalBbsTable[Idx].MfgStringOffset),
  93 //            (UINTN) ((LocalBbsTable[Idx].DescStringSegment << 4) + LocalBbsTable[Idx].DescStringOffset)
  94 //            );
  95 //          Print(L"%s\n", Desc);
  96
  97    } // for
  98 //    PauseForKey();
  99 }
 100
 101 /**
 102     Boot the legacy system with the boot option
 103
 104     @param  Option                 The legacy boot option which have BBS device path
 105
 106     @retval EFI_UNSUPPORTED        There is no legacybios protocol, do not support
 107                                  legacy boot.
 108     @retval EFI_STATUS             Return the status of LegacyBios->LegacyBoot ().
 109
 110 **/
 111 EFI_STATUS
 112 BdsLibDoLegacyBoot (
 113   IN  BDS_COMMON_OPTION           *Option
 114   )
 115 {
 116     EFI_STATUS                Status;
 117     EFI_LEGACY_BIOS_PROTOCOL  *LegacyBios;
 118
 119     Status = refit_call3_wrapper(gBS->LocateProtocol, &gEfiLegacyBootProtocolGuid, NULL, (VOID **) &LegacyBios);
 120     if (EFI_ERROR (Status)) {
 121       return EFI_UNSUPPORTED;
 122     }
 123
 124     UpdateBbsTable(Option);
 125
 126     return refit_call4_wrapper(LegacyBios->LegacyBoot, LegacyBios, (BBS_BBS_DEVICE_PATH *) Option->DevicePath,
 127                                   Option->LoadOptionsSize, Option->LoadOptions);
 128 }