OvmfPkg/BaseMemEncryptSevLib: introduce MemEncryptSevClearMmioPageEncMask()

[mirror_edk2.git] / OvmfPkg / Include / Library / MemEncryptSevLib.h

diff --git a/OvmfPkg/Include/Library/MemEncryptSevLib.h b/OvmfPkg/Include/Library/MemEncryptSevLib.h
index 99f15a7d12719a35d0effaf6764e5e4a2f038f47..b91490d5d44d7e8f60d940694c992cc5449cf2df 100644 (file)
--- a/OvmfPkg/Include/Library/MemEncryptSevLib.h
+++ b/OvmfPkg/Include/Library/MemEncryptSevLib.h
@@ -203,4 +203,29 @@ MemEncryptSevGetAddressRangeState (
   IN UINTN                    Length\r
   );\r
 \r
+/**\r
+  This function clears memory encryption bit for the MMIO region specified by\r
+  BaseAddress and NumPages.\r
+\r
+  @param[in]  Cr3BaseAddress          Cr3 Base Address (if zero then use\r
+                                      current CR3)\r
+  @param[in]  BaseAddress             The physical address that is the start\r
+                                      address of a MMIO region.\r
+  @param[in]  NumPages                The number of pages from start memory\r
+                                      region.\r
+\r
+  @retval RETURN_SUCCESS              The attributes were cleared for the\r
+                                      memory region.\r
+  @retval RETURN_INVALID_PARAMETER    Number of pages is zero.\r
+  @retval RETURN_UNSUPPORTED          Clearing the memory encryption attribute\r
+                                      is not supported\r
+**/\r
+RETURN_STATUS\r
+EFIAPI\r
+MemEncryptSevClearMmioPageEncMask (\r
+  IN PHYSICAL_ADDRESS         Cr3BaseAddress,\r
+  IN PHYSICAL_ADDRESS         BaseAddress,\r
+  IN UINTN                    NumPages\r
+  );\r
+\r
 #endif // _MEM_ENCRYPT_SEV_LIB_H_\r