[edk2-devel] [PATCH v1 1/1] Add the EFI_RESOURCE_ATTRIBUTE_SPECIAL_PURPOSE attribute.

["Michael Kubacki" <mikuback@linux.microsoft.com>]

From: Patrick Payne <patpa@microsoft.com>

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.

Cc: Liming Gao <gaoliming@byosoft.com.cn>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Signed-off-by: Patrick Payne <patpa@microsoft.com>
---
 MdeModulePkg/Core/Dxe/Gcd/Gcd.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/MdeModulePkg/Core/Dxe/Gcd/Gcd.c b/MdeModulePkg/Core/Dxe/Gcd/Gcd.c
index fe1bbd6974b7..c941fe941276 100644
--- a/MdeModulePkg/Core/Dxe/Gcd/Gcd.c
+++ b/MdeModulePkg/Core/Dxe/Gcd/Gcd.c
@@ -26,7 +26,8 @@ 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     )
 
 #define TESTED_MEMORY_ATTRIBUTES  (EFI_RESOURCE_ATTRIBUTE_PRESENT     |     \
                                        EFI_RESOURCE_ATTRIBUTE_INITIALIZED | \
@@ -92,6 +93,7 @@ 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  },
   { 0,                                              0,                        FALSE }
 };
 
@@ -691,6 +693,10 @@ ConverToCpuArchAttributes (
     CpuArchAttributes |= EFI_MEMORY_WP;
   }
 
+  if ((Attributes & EFI_MEMORY_SP) == EFI_MEMORY_SP) {
+    CpuArchAttributes |= EFI_MEMORY_SP;
+  }
+
   return CpuArchAttributes;
 }
 
@@ -2660,6 +2666,10 @@ CoreInitializeGcdServices (
             GcdMemoryType = EfiGcdMemoryTypePersistent;
           }
 
+          if ((ResourceHob->ResourceAttribute & EFI_RESOURCE_ATTRIBUTE_SPECIAL_PURPOSE) == EFI_RESOURCE_ATTRIBUTE_SPECIAL_PURPOSE) {
+            GcdMemoryType = EfiGcdMemoryTypeSystemMemory;
+          }
+
           break;
         case EFI_RESOURCE_MEMORY_MAPPED_IO:
         case EFI_RESOURCE_FIRMWARE_DEVICE:
-- 
2.45.1.windows.1



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