1 #------------------------------------------------------------------------------
3 #* Copyright 2009 - 2010, 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.
13 #------------------------------------------------------------------------------
16 # Initializes floating point units for requirement of UEFI specification.
18 # This function initializes floating-point control word to 0x027F (all exceptions
19 # masked,double-precision, round-to-nearest) and multimedia-extensions control word
20 # (if supported) to 0x1F80 (all exceptions masked, round-to-nearest, flush to zero
21 # for masked underflow).
23 ASM_GLOBAL ASM_PFX(InitializeFloatingPointUnits)
24 ASM_PFX(InitializeFloatingPointUnits):
27 # Initialize floating point units
32 # Float control word initial value:
33 # all exceptions masked, double-precision, round-to-nearest
41 # Set OSFXSR bit 9 in CR4
48 # Multimedia-extensions control word:
49 # all exceptions masked, round-to-nearest, flush to zero for masked underflow