cpu_asm.nasm 2.97 KB
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;  vim:filetype=nasm ts=8

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;  libFLAC - Free Lossless Audio Codec library
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;  Copyright (C) 2001,2002,2003,2004,2005,2006,2007  Josh Coalson
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;
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;  Redistribution and use in source and binary forms, with or without
;  modification, are permitted provided that the following conditions
;  are met:
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;  - Redistributions of source code must retain the above copyright
;  notice, this list of conditions and the following disclaimer.
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;  - Redistributions in binary form must reproduce the above copyright
;  notice, this list of conditions and the following disclaimer in the
;  documentation and/or other materials provided with the distribution.
;
;  - Neither the name of the Xiph.org Foundation nor the names of its
;  contributors may be used to endorse or promote products derived from
;  this software without specific prior written permission.
;
;  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
;  ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
;  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
;  A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
;  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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;  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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%include "nasm.h"

	data_section

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cglobal FLAC__cpu_have_cpuid_asm_ia32
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cglobal FLAC__cpu_info_asm_ia32
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cglobal FLAC__cpu_info_extended_amd_asm_ia32
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	code_section

; **********************************************************************
;
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; FLAC__uint32 FLAC__cpu_have_cpuid_asm_ia32()
;
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cident FLAC__cpu_have_cpuid_asm_ia32
	push	ebx
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	pushfd
	pop	eax
	mov	edx, eax
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	xor	eax, 0x00200000
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	push	eax
	popfd
	pushfd
	pop	eax
	cmp	eax, edx
	jz	.no_cpuid
	mov	eax, 1
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	jmp	.end
.no_cpuid:
	xor	eax, eax
.end:
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	pop	ebx
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	ret

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; **********************************************************************
;
; void FLAC__cpu_info_asm_ia32(FLAC__uint32 *flags_edx, FLAC__uint32 *flags_ecx)
;

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cident FLAC__cpu_info_asm_ia32
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	;[esp + 8] == flags_edx
	;[esp + 12] == flags_ecx

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	push	ebx
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	call	FLAC__cpu_have_cpuid_asm_ia32
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	test	eax, eax
	jz	.no_cpuid
	mov	eax, 1
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	cpuid
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	mov	ebx, [esp + 8]
	mov	[ebx], edx
	mov	ebx, [esp + 12]
	mov	[ebx], ecx
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	jmp	.end
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.no_cpuid
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	xor	eax, eax
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	mov	ebx, [esp + 8]
	mov	[ebx], eax
	mov	ebx, [esp + 12]
	mov	[ebx], eax
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.end
	pop	ebx
	ret

cident FLAC__cpu_info_extended_amd_asm_ia32
	push	ebx
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	call	FLAC__cpu_have_cpuid_asm_ia32
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	test	eax, eax
	jz	.no_cpuid
	mov	eax, 0x80000000
	cpuid
	cmp	eax, 0x80000001
	jb	.no_cpuid
	mov	eax, 0x80000001
	cpuid
	mov	eax, edx
	jmp	.end
.no_cpuid
	xor	eax, eax
.end
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	pop	ebx
	ret

end
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%ifdef OBJ_FORMAT_elf
       section .note.GNU-stack noalloc
%endif