1 files changed, 45 insertions, 0 deletions
diff --git a/roms/edk2/MdePkg/Library/BaseLib/Ia32/FlushCacheLine.nasm b/roms/edk2/MdePkg/Library/BaseLib/Ia32/FlushCacheLine.nasm
new file mode 100644
index 000000000..8afd4cbdc
--- /dev/null
+++ b/roms/edk2/MdePkg/Library/BaseLib/Ia32/FlushCacheLine.nasm
@@ -0,0 +1,45 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006 - 2015, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+;   FlushCacheLine.Asm
+;
+; Abstract:
+;
+;   AsmFlushCacheLine function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID *
+; EFIAPI
+; AsmFlushCacheLine (
+;   IN      VOID                      *LinearAddress
+;   );
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmFlushCacheLine)
+ASM_PFX(AsmFlushCacheLine):
+    ;
+    ; If the CPU does not support CLFLUSH instruction,
+    ; then promote flush range to flush entire cache.
+    ;
+    mov     eax, 1
+    push    ebx
+    cpuid
+    pop     ebx
+    mov     eax, [esp + 4]
+    test    edx, BIT19
+    jz      .0
+    clflush [eax]
+    ret
+.0:
+    wbinvd
+    ret
+