From 42849a2d9406785266ec74ffcedc77fb960a28f9 Mon Sep 17 00:00:00 2001
From: bugprogrammer <87811991@163.com>
Date: Mon, 31 Aug 2026 00:25:32 +0800
Subject: [PATCH] add (grub4dos)grldr pbr on openlegacyboot

---
 Platform/OpenLegacyBoot/LegacyBootInternal.h |  3 ++-
 Platform/OpenLegacyBoot/LegacyBootSupport.c  |  4 ++++
 Platform/OpenLegacyBoot/OpenLegacyBoot.c     | 20 +++++++++++++++++++-
 3 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/Platform/OpenLegacyBoot/LegacyBootInternal.h b/Platform/OpenLegacyBoot/LegacyBootInternal.h
index df90c24bf39..5ecefc36baa 100644
--- a/Platform/OpenLegacyBoot/LegacyBootInternal.h
+++ b/Platform/OpenLegacyBoot/LegacyBootInternal.h
@@ -34,7 +34,8 @@ typedef enum OC_LEGACY_OS_TYPE_ {
   OcLegacyOsTypeNone,
   OcLegacyOsTypeWindowsNtldr,
   OcLegacyOsTypeWindowsBootmgr,
-  OcLegacyOsTypeIsoLinux
+  OcLegacyOsTypeIsoLinux,
+  OcLegacyOsTypeGrldr
 } OC_LEGACY_OS_TYPE;
 
 EFI_STATUS
diff --git a/Platform/OpenLegacyBoot/LegacyBootSupport.c b/Platform/OpenLegacyBoot/LegacyBootSupport.c
index 412908cbfb3..7e941d0c82e 100644
--- a/Platform/OpenLegacyBoot/LegacyBootSupport.c
+++ b/Platform/OpenLegacyBoot/LegacyBootSupport.c
@@ -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"));
diff --git a/Platform/OpenLegacyBoot/OpenLegacyBoot.c b/Platform/OpenLegacyBoot/OpenLegacyBoot.c
index 51879712998..7423af3705d 100644
--- a/Platform/OpenLegacyBoot/OpenLegacyBoot.c
+++ b/Platform/OpenLegacyBoot/OpenLegacyBoot.c
@@ -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