MdePkg: Add RO memory and resource HOB attribute definitions.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@17396 6f19259b-4bc3-4df7-8a09-765794883524

2 files changed, 21 insertions, 0 deletions

diff --git a/MdePkg/Include/Pi/PiHob.h b/MdePkg/Include/Pi/PiHob.h
index fc523e1e8b..b24f95149b 100644
--- a/MdePkg/Include/Pi/PiHob.h
+++ b/MdePkg/Include/Pi/PiHob.h
@@ -255,6 +255,13 @@ typedef UINT32 EFI_RESOURCE_ATTRIBUTE_TYPE;
 #define EFI_RESOURCE_ATTRIBUTE_INITIALIZED              0x00000002

 #define EFI_RESOURCE_ATTRIBUTE_TESTED                   0x00000004

 #define EFI_RESOURCE_ATTRIBUTE_READ_PROTECTED           0x00000080

+//

+// This is typically used as memory cacheability attribute today.

+// NOTE: Since PI spec 1.4, please use EFI_RESOURCE_ATTRIBUTE_READ_ONLY_PROTECTED

+// as Physical write protected attribute, and EFI_RESOURCE_ATTRIBUTE_WRITE_PROTECTED

+// means Memory cacheability attribute: The memory supports being programmed with

+// a writeprotected cacheable attribute.

+//

 #define EFI_RESOURCE_ATTRIBUTE_WRITE_PROTECTED          0x00000100

 #define EFI_RESOURCE_ATTRIBUTE_EXECUTION_PROTECTED      0x00000200

 #define EFI_RESOURCE_ATTRIBUTE_PERSISTENT               0x00800000

@@ -274,10 +281,20 @@ typedef UINT32 EFI_RESOURCE_ATTRIBUTE_TYPE;
 #define EFI_RESOURCE_ATTRIBUTE_64_BIT_IO                0x00010000

 #define EFI_RESOURCE_ATTRIBUTE_UNCACHED_EXPORTED        0x00020000

 #define EFI_RESOURCE_ATTRIBUTE_READ_PROTECTABLE         0x00100000

+//

+// This is typically used as memory cacheability attribute today.

+// NOTE: Since PI spec 1.4, please use EFI_RESOURCE_ATTRIBUTE_READ_ONLY_PROTECTABLE

+// as Memory capability attribute: The memory supports being protected from processor

+// writes, and EFI_RESOURCE_ATTRIBUTE_WRITE_PROTEC TABLE means Memory cacheability attribute:

+// The memory supports being programmed with a writeprotected cacheable attribute.

+//

 #define EFI_RESOURCE_ATTRIBUTE_WRITE_PROTECTABLE        0x00200000

 #define EFI_RESOURCE_ATTRIBUTE_EXECUTION_PROTECTABLE    0x00400000

 #define EFI_RESOURCE_ATTRIBUTE_PERSISTABLE              0x01000000

 

+#define EFI_RESOURCE_ATTRIBUTE_READ_ONLY_PROTECTED      0x00040000

+#define EFI_RESOURCE_ATTRIBUTE_READ_ONLY_PROTECTABLE    0x00800000

+

 ///

 /// Describes the resource properties of all fixed,

 /// nonrelocatable resource ranges found on the processor

diff --git a/MdePkg/Include/Uefi/UefiSpec.h b/MdePkg/Include/Uefi/UefiSpec.h
index 1c401e8e85..243f33078a 100644
--- a/MdePkg/Include/Uefi/UefiSpec.h
+++ b/MdePkg/Include/Uefi/UefiSpec.h
@@ -71,9 +71,13 @@ typedef enum {
 //

 // Physical memory protection attributes

 //

+// Note: UEFI spec 2.5 and following: use EFI_MEMORY_RO as write-protected physical memory

+// protection attribute. Also, EFI_MEMORY_WP means cacheability attribute.

+//

 #define EFI_MEMORY_WP   0x0000000000001000ULL

 #define EFI_MEMORY_RP   0x0000000000002000ULL

 #define EFI_MEMORY_XP   0x0000000000004000ULL

+#define EFI_MEMORY_RO   0x0000000000020000ULL

 //

 // Physical memory persistence attribute. 

 // The memory region supports byte-addressable non-volatility.