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5b78f30d81
https://bugzilla.tianocore.org/show_bug.cgi?id=556 NASM requires read-only data sections to use the section name .rodata. This fix changes .rdata to .rodata. The build failure from use of .rdata is seen when using the XCODE5 tool chain. Section "7.8.1 macho extensions to the SECTION Directive" of the NASM documentation at http://www.nasm.us/doc/ describes the section name requirements. Cc: Jeff Fan <jeff.fan@intel.com> Cc: Andrew Fish <afish@apple.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Michael Kinney <michael.d.kinney@intel.com> Reviewed-by: Jeff Fan <jeff.fan@intel.com>
61 lines
1.8 KiB
NASM
61 lines
1.8 KiB
NASM
;------------------------------------------------------------------------------
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;*
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;* Copyright (c) 2009 - 2017, 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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SECTION .rodata
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;
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; Float control word initial value:
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; all exceptions masked, double-extended-precision, round-to-nearest
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;
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mFpuControlWord: DW 0x37F
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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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mMmxControlWord: DD 0x1F80
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DEFAULT REL
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SECTION .text
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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 0x027F (all exceptions
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; masked,double-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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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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; The following opcodes stand for instruction 'finit'
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; to be supported by some 64-bit assemblers
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;
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DB 0x9B, 0xDB, 0xE3
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fldcw [mFpuControlWord]
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;
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; Set OSFXSR bit 9 in CR4
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;
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mov rax, cr4
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or rax, BIT9
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mov cr4, rax
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ldmxcsr [mMmxControlWord]
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ret
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