diff options
| author |   Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
|---|---|---|
| committer | Angelos Mouzakitis <a.mouzakitis@virtualopensystems.com> | 2023-10-10 14:33:42 +0000 |
| commit | af1a266670d040d2f4083ff309d732d648afba2a (patch) | |
| tree | 2fc46203448ddcc6f81546d379abfaeb323575e9 /roms/edk2/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem.nasm | |
| parent | e02cda008591317b1625707ff8e115a4841aa889 (diff) | |
Change-Id: Iaf8d18082d3991dec7c0ebbea540f092188eb4ec
Diffstat (limited to 'roms/edk2/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem.nasm')
| -rw-r--r-- | roms/edk2/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem.nasm | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/roms/edk2/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem.nasm b/roms/edk2/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem.nasm new file mode 100644 index 000000000..450113ba8 --- /dev/null +++ b/roms/edk2/MdePkg/Library/BaseMemoryLibMmx/X64/SetMem.nasm @@ -0,0 +1,54 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2006, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+; SetMem.nasm
+;
+; Abstract:
+;
+; SetMem function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+ DEFAULT REL
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; VOID *
+; EFIAPI
+; InternalMemSetMem (
+; OUT VOID *Buffer,
+; IN UINTN Length,
+; IN UINT8 Value
+; );
+;------------------------------------------------------------------------------
+global ASM_PFX(InternalMemSetMem)
+ASM_PFX(InternalMemSetMem):
+ push rdi
+ mov rax, r8
+ mov ah, al
+ DB 0x48, 0xf, 0x6e, 0xc0 ; movd mm0, rax
+ mov r8, rcx
+ mov rdi, r8 ; rdi <- Buffer
+ mov rcx, rdx
+ and edx, 7
+ shr rcx, 3
+ jz @SetBytes
+ DB 0xf, 0x70, 0xC0, 0x0 ; pshufw mm0, mm0, 0h
+.0:
+ DB 0xf, 0xe7, 0x7 ; movntq [rdi], mm0
+ add rdi, 8
+ loop .0
+ mfence
+@SetBytes:
+ mov ecx, edx
+ rep stosb
+ mov rax, r8
+ pop rdi
+ ret
+
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