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OpenLegacyBoot: Add grub4dos (grldr) PBR detection support #623

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Merged
vit9696 merged 1 commit into from
Aug 31, 2026
Merged

OpenLegacyBoot: Add grub4dos (grldr) PBR detection support #623

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3 changes: 2 additions & 1 deletion Platform/OpenLegacyBoot/LegacyBootInternal.h
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Original file line number Diff line number Diff line change
Expand Up @@ -34,7 +34,8 @@ typedef enum OC_LEGACY_OS_TYPE_ {
OcLegacyOsTypeNone,
OcLegacyOsTypeWindowsNtldr,
OcLegacyOsTypeWindowsBootmgr,
OcLegacyOsTypeIsoLinux
OcLegacyOsTypeIsoLinux,
OcLegacyOsTypeGrldr
} OC_LEGACY_OS_TYPE;

EFI_STATUS
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4 changes: 4 additions & 0 deletions Platform/OpenLegacyBoot/LegacyBootSupport.c
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Expand Up @@ -353,6 +353,10 @@ InternalGetPartitionLegacyOsType (
|| CheckLegacySignature ("isolinux", Buffer, BufferSize))
{
LegacyOsType = OcLegacyOsTypeIsoLinux;
} else if ( CheckLegacySignature ("GRLDR", Buffer, BufferSize)
|| CheckLegacySignature ("grldr", Buffer, BufferSize))
{
LegacyOsType = OcLegacyOsTypeGrldr;
} else {
LegacyOsType = OcLegacyOsTypeNone;
DEBUG ((DEBUG_INFO, "OLB: Unknown legacy bootsector signature\n"));
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20 changes: 19 additions & 1 deletion Platform/OpenLegacyBoot/OpenLegacyBoot.c
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Expand Up @@ -34,7 +34,25 @@ GetLegacyEntryName (
OC_LEGACY_OS_TYPE LegacyOsType
)
{
return AllocateCopyPool (L_STR_SIZE ("Windows (legacy)"), "Windows (legacy)");
CONST CHAR8 *Name;

switch (LegacyOsType) {
case OcLegacyOsTypeIsoLinux:
Name = "Linux (legacy)";
break;

case OcLegacyOsTypeGrldr:
Name = "Grub4dos (legacy)";
break;

case OcLegacyOsTypeWindowsBootmgr:
case OcLegacyOsTypeWindowsNtldr:
default:
Name = "Windows (legacy)";
break;
}

return AllocateCopyPool (AsciiStrSize (Name), Name);
}

STATIC
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