cpuid.asm

wince下的xvidcore开发库,可用于MP4等视频播放开发

 ;/****************************************************************************
 ; *
 ; *  XVID MPEG-4 VIDEO CODEC
 ; *  - CPUID check processors capabilities -
 ; *
 ; *  Copyright (C) 2001 Michael Militzer <[e-mail]>
 ; *
 ; *  This program is free software ; you can redistribute it and/or modify
 ; *  it under the terms of the GNU General Public License as published by
 ; *  the Free Software Foundation ; either version 2 of the License, or
 ; *  (at your option) any later version.
 ; *
 ; *  This program is distributed in the hope that it will be useful,
 ; *  but WITHOUT ANY WARRANTY ; without even the implied warranty of
 ; *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 ; *  GNU General Public License for more details.
 ; *
 ; *  You should have received a copy of the GNU General Public License
 ; *  along with this program ; if not, write to the Free Software
 ; *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 ; *
 ; * $Id: cpuid.asm,v 1.1 2005/07/21 09:09:05 klschoef Exp $
 ; *
 ; ***************************************************************************/
 
 BITS 32
 
 %macro cglobal 1
         %ifdef PREFIX
                 global _%1
                 %define %1 _%1
         %else
                 global %1
         %endif
 %endmacro
 
 ;=============================================================================
 ; Constants
 ;=============================================================================
 
 %define CPUID_TSC               0x00000010
 %define CPUID_MMX               0x00800000
 %define CPUID_SSE               0x02000000
 %define CPUID_SSE2              0x04000000
 
 %define EXT_CPUID_3DNOW         0x80000000
 %define EXT_CPUID_AMD_3DNOWEXT  0x40000000
 %define EXT_CPUID_AMD_MMXEXT    0x00400000
 
 ;;; NB: Make sure these defines match the ones defined in xvid.h
 %define XVID_CPU_MMX      (1<< 0)
 %define XVID_CPU_MMXEXT   (1<< 1)
 %define XVID_CPU_SSE      (1<< 2)
 %define XVID_CPU_SSE2     (1<< 3)
 %define XVID_CPU_3DNOW    (1<< 4)
 %define XVID_CPU_3DNOWEXT (1<< 5)
 %define XVID_CPU_TSC      (1<< 6)
 
 ;=============================================================================
 ; Read only data
 ;=============================================================================
 
 ALIGN 32
 %ifdef FORMAT_COFF
 SECTION .rodata data
 %else
 SECTION .rodata data align=16
 %endif
 
 vendorAMD:
                 db "AuthenticAMD"
 
 ;=============================================================================
 ; Macros
 ;=============================================================================
 
 %macro  CHECK_FEATURE         3
   mov ecx, %1
   and ecx, edx
   neg ecx
   sbb ecx, ecx
   and ecx, %2
   or %3, ecx
 %endmacro
 
 ;=============================================================================
 ; Code
 ;=============================================================================
 
 SECTION .text
 
 ; int check_cpu_feature(void)
 
 cglobal check_cpu_features
 check_cpu_features:
 
   push ebx
   push esi
   push edi
   push ebp
 
   xor ebp, ebp
 
         ; CPUID command ?
   pushfd
   pop eax
   mov ecx, eax
   xor eax, 0x200000
   push eax
   popfd
   pushfd
   pop eax
   cmp eax, ecx
 
   jz near .cpu_quit             ; no CPUID command -> exit
 
 
         ; get vendor string, used later
   xor eax, eax
   cpuid
   mov [esp-12], ebx       ; vendor string
   mov [esp-12+4], edx
   mov [esp-12+8], ecx
   test eax, eax
 
   jz near .cpu_quit
 
   mov eax, 1
   cpuid
 
  ; RDTSC command ?
   CHECK_FEATURE CPUID_TSC, XVID_CPU_TSC, ebp
 
   ; MMX support ?
   CHECK_FEATURE CPUID_MMX, XVID_CPU_MMX, ebp
 
   ; SSE support ?
   CHECK_FEATURE CPUID_SSE, (XVID_CPU_MMXEXT|XVID_CPU_SSE), ebp
 
   ; SSE2 support?
   CHECK_FEATURE CPUID_SSE2, XVID_CPU_SSE2, ebp
 
   ; extended functions?
   mov eax, 0x80000000
   cpuid
   cmp eax, 0x80000000
   jbe near .cpu_quit
 
   mov eax, 0x80000001
   cpuid
 
  ; AMD cpu ?
   lea esi, [vendorAMD]
   lea edi, [esp-12]
   mov ecx, 12
   cld
   repe cmpsb
   jnz .cpu_quit
 
   ; 3DNow! support ?
   CHECK_FEATURE EXT_CPUID_3DNOW, XVID_CPU_3DNOW, ebp
 
   ; 3DNOW extended ?
   CHECK_FEATURE EXT_CPUID_AMD_3DNOWEXT, XVID_CPU_3DNOWEXT, ebp
 
   ; extended MMX ?
   CHECK_FEATURE EXT_CPUID_AMD_MMXEXT, XVID_CPU_MMXEXT, ebp
 
 .cpu_quit:
 
   mov eax, ebp
 
   pop ebp
   pop edi
   pop esi
   pop ebx
 
   ret
 
 ; sse/sse2 operating support detection routines
 ; these will trigger an invalid instruction signal if not supported.
 ALIGN 16
 cglobal sse_os_trigger
 sse_os_trigger:
   xorps xmm0, xmm0
   ret
 
 
 ALIGN 16
 cglobal sse2_os_trigger
 sse2_os_trigger:
   xorpd xmm0, xmm0
   ret
 
 
 ; enter/exit mmx state
 ALIGN 16
 cglobal emms_mmx
 emms_mmx:
   emms
   ret
 
 ; faster enter/exit mmx state
 ALIGN 16
 cglobal emms_3dn
 emms_3dn:
   femms
   ret