Rev 1905 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1905 | serge | 1 | /* |
| 2 | getcpucpuflags: get cpuflags for ia32 |
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| 3 | |||
| 4 | copyright ?-2006 by the mpg123 project - free software under the terms of the LGPL 2.1 |
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| 5 | see COPYING and AUTHORS files in distribution or http:#mpg123.org |
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| 6 | initially written by KIMURA Takuhiro (for 3DNow!) |
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| 7 | extended for general use by Thomas Orgis |
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| 8 | |||
| 9 | extern int getcpuid(struct cpuflags*) |
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| 10 | or just |
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| 11 | extern int getcpuid(unsigned int*) |
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| 12 | where there is memory for 4 ints |
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| 13 | -> the first set of idflags (basic cpu family info) |
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| 14 | and the idflags, stdflags, std2flags, extflags written to the parameter |
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| 15 | -> 0x00000000 (CPUID instruction not supported) |
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| 16 | */ |
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| 17 | |||
| 18 | #include "mangle.h" |
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| 19 | |||
| 20 | .text |
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| 21 | ALIGN4 |
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| 22 | |||
| 23 | .globl ASM_NAME(getcpuflags) |
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| 24 | /* .type ASM_NAME(getcpuflags),@function */ |
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| 25 | ASM_NAME(getcpuflags): |
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| 26 | pushl %ebp |
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| 27 | movl %esp,%ebp |
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| 28 | pushl %edx |
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| 29 | pushl %ecx |
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| 30 | pushl %ebx |
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| 31 | pushl %esi |
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| 32 | /* get the int pointer for storing the flags */ |
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| 33 | movl 8(%ebp), %esi |
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| 34 | /* does that one make sense? */ |
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| 35 | movl $0x80000000,%eax |
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| 36 | /* now save the flags and do a check for cpuid availability */ |
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| 37 | pushfl |
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| 38 | pushfl |
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| 39 | popl %eax |
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| 40 | movl %eax,%ebx |
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| 41 | /* set that bit... */ |
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| 42 | xorl $0x00200000,%eax |
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| 43 | pushl %eax |
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| 44 | popfl |
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| 45 | /* ...and read back the flags to see if it is understood */ |
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| 46 | pushfl |
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| 47 | popl %eax |
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| 48 | popfl |
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| 49 | cmpl %ebx,%eax |
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| 50 | je .Lnocpuid |
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| 51 | /* In principle, I would have to check the CPU's identify first to be sure how to interpret the extended flags. */ |
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| 52 | /* now get the info, first extended */ |
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| 53 | movl $0x0, 12(%esi) /* clear value */ |
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| 54 | /* only if supported... */ |
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| 55 | movl $0x80000000, %eax |
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| 56 | cpuid |
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| 57 | /* IDT CPUs should not change EAX, generally I hope that non-3DNow cpus do not set a bogus support level here. */ |
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| 58 | cmpl $0x80000001, %eax |
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| 59 | jb .Lnoextended /* Skip ext check without minimal support level. */ |
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| 60 | /* is supported, get flags value */ |
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| 61 | movl $0x80000001,%eax |
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| 62 | cpuid |
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| 63 | movl %edx,12(%esi) |
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| 64 | .Lnoextended: |
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| 65 | /* then the other ones, called last to get the id flags in %eax for ret */ |
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| 66 | movl $0x00000001,%eax |
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| 67 | cpuid |
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| 68 | movl %eax, (%esi) |
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| 69 | movl %ecx, 4(%esi) |
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| 70 | movl %edx, 8(%esi) |
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| 71 | jmp .Lend |
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| 72 | ALIGN4 |
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| 73 | .Lnocpuid: |
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| 74 | /* error: set everything to zero */ |
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| 75 | movl $0, %eax |
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| 76 | movl $0, (%esi) |
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| 77 | movl $0, 4(%esi) |
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| 78 | movl $0, 8(%esi) |
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| 79 | movl $0, 12(%esi) |
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| 80 | ALIGN4 |
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| 81 | .Lend: |
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| 82 | /* return value are the id flags, still stored in %eax */ |
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| 83 | popl %esi |
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| 84 | popl %ebx |
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| 85 | popl %ecx |
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| 86 | popl %edx |
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| 87 | movl %ebp,%esp |
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| 88 | popl %ebp |
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| 89 | ret |
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| 90 | |||
| 3960 | Serge | 91 | NONEXEC_STACK |