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| author | Liming Gao <liming.gao@intel.com> | 2016-06-14 15:59:02 +0800 |
|---|---|---|
| committer | Liming Gao <liming.gao@intel.com> | 2016-06-28 09:52:08 +0800 |
| commit | ce3e0a906f10a20f5c4ca5111876da0a1b99f52b (patch) | |
| tree | 609f368989c1510d26702fcdd04960fbda0c21f6 /UefiCpuPkg | |
| parent | f893042d05c9ec7a889ee5b74b4ca5090c553daf (diff) | |
| download | edk2-ce3e0a906f10a20f5c4ca5111876da0a1b99f52b.tar.gz edk2-ce3e0a906f10a20f5c4ca5111876da0a1b99f52b.tar.bz2 edk2-ce3e0a906f10a20f5c4ca5111876da0a1b99f52b.zip | |
UefiCpuPkg BaseUefiCpuLib: Convert X64/InitializeFpu.asm to NASM
The BaseTools/Scripts/ConvertMasmToNasm.py script was used to convert
X64/InitializeFpu.asm to X64/InitializeFpu.nasm.
And, manually add .rdata section.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Liming Gao <liming.gao@intel.com>
Diffstat (limited to 'UefiCpuPkg')
| -rw-r--r-- | UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.nasm | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.nasm b/UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.nasm new file mode 100644 index 0000000000..904b64e510 --- /dev/null +++ b/UefiCpuPkg/Library/BaseUefiCpuLib/X64/InitializeFpu.nasm @@ -0,0 +1,60 @@ +;------------------------------------------------------------------------------
+;*
+;* Copyright (c) 2009 - 2012, Intel Corporation. All rights reserved.<BR>
+;* This program and the accompanying materials
+;* are licensed and made available under the terms and conditions of the BSD License
+;* which accompanies this distribution. The full text of the license may be found at
+;* http://opensource.org/licenses/bsd-license.php
+;*
+;* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+;* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+;*
+;*
+;------------------------------------------------------------------------------
+
+ SECTION .rdata
+;
+; Float control word initial value:
+; all exceptions masked, double-extended-precision, round-to-nearest
+;
+mFpuControlWord: DW 0x37F
+;
+; Multimedia-extensions control word:
+; all exceptions masked, round-to-nearest, flush to zero for masked underflow
+;
+mMmxControlWord: DD 0x1F80
+
+DEFAULT REL
+SECTION .text
+
+;
+; Initializes floating point units for requirement of UEFI specification.
+;
+; This function initializes floating-point control word to 0x027F (all exceptions
+; masked,double-precision, round-to-nearest) and multimedia-extensions control word
+; (if supported) to 0x1F80 (all exceptions masked, round-to-nearest, flush to zero
+; for masked underflow).
+;
+global ASM_PFX(InitializeFloatingPointUnits)
+ASM_PFX(InitializeFloatingPointUnits):
+
+ ;
+ ; Initialize floating point units
+ ;
+ ; The following opcodes stand for instruction 'finit'
+ ; to be supported by some 64-bit assemblers
+ ;
+ DB 0x9B, 0xDB, 0xE3
+ fldcw [mFpuControlWord]
+
+ ;
+ ; Set OSFXSR bit 9 in CR4
+ ;
+ mov rax, cr4
+ or rax, BIT9
+ mov cr4, rax
+
+ ldmxcsr [mMmxControlWord]
+
+ ret
+
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