7798fb83de
Signed-off-by: Tian, Hot <hot.tian@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15162 6f19259b-4bc3-4df7-8a09-765794883524
58 lines
1.8 KiB
ArmAsm
58 lines
1.8 KiB
ArmAsm
#------------------------------------------------------------------------------
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#*
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#* Copyright (c) 2009 - 2012, Intel Corporation. All rights reserved.<BR>
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#* This program and the accompanying materials
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#* are licensed and made available under the terms and conditions of the BSD License
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#* which accompanies this distribution. The full text of the license may be found at
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#* http://opensource.org/licenses/bsd-license.php
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#*
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#* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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#* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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#*
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#*
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#------------------------------------------------------------------------------
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#
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# Initializes floating point units for requirement of UEFI specification.
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#
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# This function initializes floating-point control word to 0x037F (all exceptions
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# masked,double-extended-precision, round-to-nearest) and multimedia-extensions control word
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# (if supported) to 0x1F80 (all exceptions masked, round-to-nearest, flush to zero
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# for masked underflow).
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#
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ASM_GLOBAL ASM_PFX(InitializeFloatingPointUnits)
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ASM_PFX(InitializeFloatingPointUnits):
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#
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# Initialize floating point units
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#
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finit
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#
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# Float control word initial value:
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# all exceptions masked, double-precision, round-to-nearest
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#
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pushq $0x037F
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lea (%rsp), %rax
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fldcw (%rax)
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popq %rax
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#
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# Set OSFXSR bit 9 in CR4
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#
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movq %cr4, %rax
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or $0x200, %rax
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movq %rax, %cr4
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#
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# Multimedia-extensions control word:
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# all exceptions masked, round-to-nearest, flush to zero for masked underflow
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#
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pushq $0x01F80
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lea (%rsp), %rax
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ldmxcsr (%rax)
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popq %rax
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ret
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