UefiCpuPkg\CpuSmm: Save & restore CR2 on-demand paging in SMM

[mirror_edk2.git] / UefiCpuPkg / PiSmmCpuDxeSmm / PiSmmCpuDxeSmm.h

diff --git a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
index 84efb229819b727628c8b583c7180cc828d798f4..38f91041179c8e64e8bf00f15ca599d17de1782c 100644 (file)
--- a/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
+++ b/UefiCpuPkg/PiSmmCpuDxeSmm/PiSmmCpuDxeSmm.h
@@ -1243,4 +1243,26 @@ EFIAPI
 PiSmmCpuSmiEntryFixupAddress (\r
  );\r
 \r
+/**\r
+  This function reads CR2 register when on-demand paging is enabled\r
+  for 64 bit and no action for 32 bit.\r
+\r
+  @param[out]  *Cr2  Pointer to variable to hold CR2 register value.\r
+**/\r
+VOID\r
+SaveCr2 (\r
+  OUT UINTN  *Cr2\r
+  );\r
+\r
+/**\r
+  This function writes into CR2 register when on-demand paging is enabled\r
+  for 64 bit and no action for 32 bit.\r
+\r
+  @param[in]  Cr2  Value to write into CR2 register.\r
+**/\r
+VOID\r
+RestoreCr2 (\r
+  IN UINTN  Cr2\r
+  );\r
+\r
 #endif\r