diff options
Diffstat (limited to 'UefiCpuPkg/Library/BaseUefiCpuLib/Ia32/InitializeFpu.nasm')
-rw-r--r-- | UefiCpuPkg/Library/BaseUefiCpuLib/Ia32/InitializeFpu.nasm | 68 |
1 files changed, 0 insertions, 68 deletions
diff --git a/UefiCpuPkg/Library/BaseUefiCpuLib/Ia32/InitializeFpu.nasm b/UefiCpuPkg/Library/BaseUefiCpuLib/Ia32/InitializeFpu.nasm deleted file mode 100644 index 5e27cc3250..0000000000 --- a/UefiCpuPkg/Library/BaseUefiCpuLib/Ia32/InitializeFpu.nasm +++ /dev/null @@ -1,68 +0,0 @@ -;------------------------------------------------------------------------------
-;*
-;* Copyright (c) 2016 - 2017, Intel Corporation. All rights reserved.<BR>
-;* SPDX-License-Identifier: BSD-2-Clause-Patent
-;*
-;*
-;------------------------------------------------------------------------------
-
- SECTION .rodata
-
-;
-; Float control word initial value:
-; all exceptions masked, double-precision, round-to-nearest
-;
-mFpuControlWord: DW 0x27F
-;
-; Multimedia-extensions control word:
-; all exceptions masked, round-to-nearest, flush to zero for masked underflow
-;
-mMmxControlWord: DD 0x1F80
-
- 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):
-
- push ebx
-
- ;
- ; Initialize floating point units
- ;
- finit
- fldcw [mFpuControlWord]
-
- ;
- ; Use CpuId instructuion (CPUID.01H:EDX.SSE[bit 25] = 1) to test
- ; whether the processor supports SSE instruction.
- ;
- mov eax, 1
- cpuid
- bt edx, 25
- jnc Done
-
- ;
- ; Set OSFXSR bit 9 in CR4
- ;
- mov eax, cr4
- or eax, BIT9
- mov cr4, eax
-
- ;
- ; The processor should support SSE instruction and we can use
- ; ldmxcsr instruction
- ;
- ldmxcsr [mMmxControlWord]
-Done:
- pop ebx
-
- ret
-
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