diff options
Diffstat (limited to 'MdePkg/Library/BaseLib/X64/XSetBv.nasm')
-rw-r--r-- | MdePkg/Library/BaseLib/X64/XSetBv.nasm | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/MdePkg/Library/BaseLib/X64/XSetBv.nasm b/MdePkg/Library/BaseLib/X64/XSetBv.nasm new file mode 100644 index 0000000000..c07e9b4c88 --- /dev/null +++ b/MdePkg/Library/BaseLib/X64/XSetBv.nasm @@ -0,0 +1,34 @@ +;------------------------------------------------------------------------------
+;
+; Copyright (c) 2021, Intel Corporation. All rights reserved.<BR>
+; SPDX-License-Identifier: BSD-2-Clause-Patent
+;
+; Module Name:
+;
+; XSetBv.nasm
+;
+; Abstract:
+;
+; AsmXSetBv function
+;
+; Notes:
+;
+;------------------------------------------------------------------------------
+
+ DEFAULT REL
+ SECTION .text
+
+;------------------------------------------------------------------------------
+; UINT64
+; EFIAPI
+; AsmXSetBv (
+; IN UINT32 Index,
+; IN UINT64 Value
+; );
+;------------------------------------------------------------------------------
+global ASM_PFX(AsmXSetBv)
+ASM_PFX(AsmXSetBv):
+ mov rax, rdx ; meanwhile, rax <- return value
+ shr rdx, 0x20 ; edx:eax contains the value to write
+ xsetbv
+ ret
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