1 files changed, 35 insertions, 1 deletions

diff --git a/ArmPkg/Include/Library/ArmMmuLib.h b/ArmPkg/Include/Library/ArmMmuLib.h
index 4cf59a1..91d1123 100644
--- a/ArmPkg/Include/Library/ArmMmuLib.h
+++ b/ArmPkg/Include/Library/ArmMmuLib.h
@@ -92,11 +92,45 @@ ArmReplaceLiveTranslationEntry (
   IN  BOOLEAN  DisableMmu

   );

 

+/**

+  Set the requested memory permission attributes on a region of memory.

+

+  BaseAddress and Length must be aligned to EFI_PAGE_SIZE.

+

+  If Attributes contains a memory type attribute (EFI_MEMORY_UC/WC/WT/WB), the

+  region is mapped according to this memory type, and additional memory

+  permission attributes (EFI_MEMORY_RP/RO/XP) are taken into account as well,

+  discarding any permission attributes that are currently set for the region.

+  AttributeMask is ignored in this case, and must be set to 0x0.

+

+  If Attributes contains only a combination of memory permission attributes

+  (EFI_MEMORY_RP/RO/XP), each page in the region will retain its existing

+  memory type, even if it is not uniformly set across the region. In this case,

+  AttributesMask may be set to a mask of permission attributes, and memory

+  permissions omitted from this mask will not be updated for any page in the

+  region. All attributes appearing in Attributes must appear in AttributeMask

+  as well. (Attributes & ~AttributeMask must produce 0x0)

+

+  @param[in]  BaseAddress     The physical address that is the start address of

+                              a memory region.

+  @param[in]  Length          The size in bytes of the memory region.

+  @param[in]  Attributes      Mask of memory attributes to set.

+  @param[in]  AttributeMask   Mask of memory attributes to take into account.

+

+  @retval EFI_SUCCESS           The attributes were set for the memory region.

+  @retval EFI_INVALID_PARAMETER BaseAddress or Length is not suitably aligned.

+                                Invalid combination of Attributes and

+                                AttributeMask.

+  @retval EFI_OUT_OF_RESOURCES  Requested attributes cannot be applied due to

+                                lack of system resources.

+

+**/

 EFI_STATUS

 ArmSetMemoryAttributes (

   IN EFI_PHYSICAL_ADDRESS  BaseAddress,

   IN UINT64                Length,

-  IN UINT64                Attributes

+  IN UINT64                Attributes,

+  IN UINT64                AttributeMask

   );

 

 #endif // ARM_MMU_LIB_H_