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  • Committer: Bazaar Package Importer
  • Author(s): Guillem Jover
  • Date: 2004-06-27 08:07:09 UTC
  • Revision ID: james.westby@ubuntu.com-20040627080709-1gkxm72ex66gkwe4
Tags: upstream-3.10.21
Import upstream version 3.10.21

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det_x86.asm
 
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;*
 
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;* $Id: det_x86.asm,v 1.1.1.1 2002/03/28 00:02:20 andrew_belov Exp $
 
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;* ---------------------------------------------------------------------------
 
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;* This code uses the  classic way  of determining what Intel x86 CPU is used.
 
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;* The exact author is unknown.
 
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;*
 
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INCLUDE         ASM_INCL.INC
 
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public          detect_x86
 
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.CODE
 
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;*
 
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;* Returns one of the following values for corresponding CPU types:
 
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;*
 
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;*    0x0086 -> 8086/8088
 
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;*    0x0186 -> 80186/80188
 
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;*    0x0286 -> 80286
 
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;*    0x0386 -> 80386 and higher
 
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;*
 
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detect_x86      proc
 
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                pushf
 
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                xor     ax, ax
 
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                push    ax
 
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                popf
 
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                pushf
 
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                pop     ax
 
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                and     ax, 0F000h
 
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                cmp     ax, 0F000h
 
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                jnz     test_386
 
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                push    cx
 
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                mov     ax, 0FFFFh
 
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                mov     cl, 21h
 
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                shl     ax, cl
 
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                pop     cx
 
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                jnz     l186
 
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                mov     ax, 86h
 
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                popf
 
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                jmp     short done
 
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l186:
 
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                mov     ax, 186h
 
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                popf
 
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                jmp     short done
 
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test_386:
 
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                mov     ax, 7000h
 
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                push    ax
 
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                popf
 
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                pushf
 
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                pop     ax
 
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                and     ax, 7000h
 
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                jnz     l386
 
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                mov     ax, 286h
 
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                popf
 
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                jmp     short done
 
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l386:
 
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                mov     ax, 386h
 
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                popf
 
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                jmp     short $+2
 
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done:
 
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                ret
 
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detect_x86      endp
 
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                end