1 files changed, 47 insertions, 0 deletions
diff --git a/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem32.nasm b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem32.nasm
new file mode 100644
index 00000000..1cd02b36
--- /dev/null
+++ b/src/VBox/Devices/EFI/Firmware/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem32.nasm
@@ -0,0 +1,47 @@
+;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+;   SetMem32.nasm
+;
+; Abstract:
+;
+;   SetMem32 function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+    DEFAULT REL
+    SECTION .text
+
+;------------------------------------------------------------------------------
+;  VOID *
+;  InternalMemSetMem32 (
+;    IN VOID   *Buffer,
+;    IN UINTN  Count,
+;    IN UINT32 Value
+;    )
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemSetMem32)
+ASM_PFX(InternalMemSetMem32):
+    DB      0x49, 0xf, 0x6e, 0xc0         ; movd mm0, r8 (Value)
+    mov     rax, rcx                    ; rax <- Buffer
+    xchg    rcx, rdx                    ; rcx <- Count  rdx <- Buffer
+    shr     rcx, 1                      ; rcx <- # of qwords to set
+    jz      @SetDwords
+    DB      0xf, 0x70, 0xC0, 0x44         ; pshufw mm0, mm0, 44h
+.0:
+    DB      0xf, 0xe7, 0x2              ; movntq [rdx], mm0
+    lea     rdx, [rdx + 8]              ; use "lea" to avoid flag changes
+    loop    .0
+    mfence
+@SetDwords:
+    jnc     .1
+    DB      0xf, 0x7e, 0x2               ; movd [rdx], mm0
+.1:
+    ret
+