Add the EFI_RESOURCE_ATTRIBUTE_SPECIAL_PURPOSE attribute.

Add the EFI_RESOURCE_ATTRIBUTE_SPECIAL_PURPOSE resource attribute as per
the PI 1.8 spec. This flag is used to indicate that the memory should be
treated as special purpose memory (SPM).

Also adds GCD code that marks the SPM with the EFI_MEMORY_SP bit and
sets the GCD memory type to EfiGcdMemoryTypeSystemMemory.

Author: Patrick Payne

MdeModulePkg/Core/Dxe/Gcd/Gcd.c

@@ -16,6 +16,8 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
 
 #define MINIMUM_INITIAL_MEMORY_SIZE  0x10000
 
+// MU_CHANGE BEGIN: Add EFI_MEMORY_SP
+
 #define MEMORY_ATTRIBUTE_MASK  (EFI_RESOURCE_ATTRIBUTE_PRESENT             |        \
                                        EFI_RESOURCE_ATTRIBUTE_INITIALIZED         | \
                                        EFI_RESOURCE_ATTRIBUTE_TESTED              | \
@@ -26,7 +28,10 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
                                        EFI_RESOURCE_ATTRIBUTE_16_BIT_IO           | \
                                        EFI_RESOURCE_ATTRIBUTE_32_BIT_IO           | \
                                        EFI_RESOURCE_ATTRIBUTE_64_BIT_IO           | \
-                                       EFI_RESOURCE_ATTRIBUTE_PERSISTENT          )
+                                       EFI_RESOURCE_ATTRIBUTE_PERSISTENT          | \
+                                       EFI_RESOURCE_ATTRIBUTE_SPECIAL_PURPOSE     )
+
+// MU_CHANGE END: Add EFI_MEMORY_SP
 
 #define TESTED_MEMORY_ATTRIBUTES  (EFI_RESOURCE_ATTRIBUTE_PRESENT     |     \
                                        EFI_RESOURCE_ATTRIBUTE_INITIALIZED | \
@@ -92,6 +97,7 @@ GCD_ATTRIBUTE_CONVERSION_ENTRY  mAttributeConversionTable[] = {
   { EFI_RESOURCE_ATTRIBUTE_TESTED,                  EFI_MEMORY_TESTED,        FALSE },
   { EFI_RESOURCE_ATTRIBUTE_PERSISTABLE,             EFI_MEMORY_NV,            TRUE  },
   { EFI_RESOURCE_ATTRIBUTE_MORE_RELIABLE,           EFI_MEMORY_MORE_RELIABLE, TRUE  },
+  { EFI_RESOURCE_ATTRIBUTE_SPECIAL_PURPOSE,         EFI_MEMORY_SP,            TRUE  }, // MU_CHANGE: Add EFI_MEMORY_SP
   { 0,                                              0,                        FALSE }
 };
 
@@ -703,6 +709,14 @@ ConverToCpuArchAttributes (
     CpuArchAttributes |= EFI_MEMORY_WP;
   }
 
+  // MU_CHANGE BEGIN: Add EFI_MEMORY_SP
+
+  if ((Attributes & EFI_MEMORY_SP) == EFI_MEMORY_SP) {
+    CpuArchAttributes |= EFI_MEMORY_SP;
+  }
+
+  // MU_CHANGE END: Add EFI_MEMORY_SP
+
   return CpuArchAttributes;
 }
 
@@ -2611,6 +2625,14 @@ CoreInitializeGcdServices (
             GcdMemoryType = EfiGcdMemoryTypeReserved;
           }
 
+          // MU_CHANGE BEGIN: Add EFI_MEMORY_SP
+
+          if ((ResourceHob->ResourceAttribute & EFI_RESOURCE_ATTRIBUTE_SPECIAL_PURPOSE) == EFI_RESOURCE_ATTRIBUTE_SPECIAL_PURPOSE) {
+            GcdMemoryType = EfiGcdMemoryTypeReserved;
+          }
+
+          // MU_CHANGE END: Add EFI_MEMORY_SP
+
           if ((ResourceHob->ResourceAttribute & EFI_RESOURCE_ATTRIBUTE_PERSISTENT) == EFI_RESOURCE_ATTRIBUTE_PERSISTENT) {
             GcdMemoryType = EfiGcdMemoryTypePersistent;
           }