1 ;------------------------------------------------------------------------------
3 ;* Copyright 2009, Intel Corporation
4 ;* All rights reserved. This program and the accompanying materials
5 ;* are licensed and made available under the terms and conditions of the BSD License
6 ;* which accompanies this distribution. The full text of the license may be found at
7 ;* http://opensource.org/licenses/bsd-license.php
9 ;* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
10 ;* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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18 ; Float control word initial value:
19 ; all exceptions masked, double-precision, round-to-nearest
21 mFpuControlWord DW 027Fh
23 ; Multimedia-extensions control word:
24 ; all exceptions masked, round-to-nearest, flush to zero for masked underflow
26 mMmxControlWord DD 01F80h
32 ; Initializes floating point units for requirement of UEFI specification.
34 ; This function initializes floating-point control word to 0x027F (all exceptions
35 ; masked,double-precision, round-to-nearest) and multimedia-extensions control word
36 ; (if supported) to 0x1F80 (all exceptions masked, round-to-nearest, flush to zero
37 ; for masked underflow).
39 InitializeFloatingPointUnits PROC PUBLIC
42 ; Initialize floating point units
48 ; Set OSFXSR bit 9 in CR4
54 ldmxcsr mMmxControlWord
57 InitializeFloatingPointUnits ENDP