| 1 | /*
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| 2 | * Cpu detection code, extracted from mmx.h ((c)1997-99 by H. Dietz
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| 3 | * and R. Fisher). Converted to C and improved by Fabrice Bellard
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| 4 | *
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| 5 | * This file is part of uniaud.dll.
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| 6 | *
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| 7 | * Copyright (c) 2010 Mensys BV
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| 8 | * Copyright (c) 2007 Vlad Stelmahovsky aka Vladest
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| 9 | *
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| 10 | * This library is free software: you can redistribute it and/or modify
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| 11 | * it under the terms of the GNU Lesser General Public License as
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| 12 | * published by the Free Software Foundation, either version 3 of
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| 13 | * the License, or (at your option) any later version.
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| 14 | *
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| 15 | * This library is distributed in the hope that it will be useful,
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| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 18 | * GNU Lesser General Public License for more details.
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| 19 | *
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| 20 | * You should have received a copy of the GNU Lesser General Public
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| 21 | * License and the GNU General Public License along with this library.
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| 22 | * If not, see <http://www.gnu.org/licenses/>.
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| 23 | */
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| 24 |
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| 25 | #include <stdlib.h>
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| 26 | //#include "../dsputil.h"
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| 27 | #define MM_MMX 0x0001 /* standard MMX */
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| 28 | #define MM_3DNOW 0x0004 /* AMD 3DNOW */
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| 29 | #define MM_MMXEXT 0x0002 /* SSE integer functions or AMD MMX ext */
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| 30 | #define MM_SSE 0x0008 /* SSE functions */
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| 31 | #define MM_SSE2 0x0010 /* PIV SSE2 functions */
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| 32 |
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| 33 |
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| 34 | /* ebx saving is necessary for PIC. gcc seems unable to see it alone */
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| 35 |
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| 36 | /* Function to test if multimedia instructions are supported... */
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| 37 | int mm_support(void)
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| 38 | {
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| 39 | int rval;
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| 40 | int Reax, Rebx, Recx, Redx;
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| 41 |
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| 42 | #pragma disable_message (200)
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| 43 | void cpuid(unsigned long index);
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| 44 | #pragma aux cpuid = \
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| 45 | "mov esi, ebx" \
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| 46 | "cpuid" \
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| 47 | "xchg esi, ebx" \
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| 48 | "mov Reax, eax" \
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| 49 | "mov Rebx, esi" \
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| 50 | "mov Recx, ecx" \
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| 51 | "mov Redx, edx" \
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| 52 | parm [eax] \
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| 53 | modify [eax ebx ecx edx esi]
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| 54 |
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| 55 | _asm {
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| 56 | /* See if CPUID instruction is supported ... */
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| 57 | /* ... Get copies of EFLAGS into eax and ecx */
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| 58 | pushfd
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| 59 | pop eax
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| 60 | mov Recx, eax
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| 61 |
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| 62 | /* ... Toggle the ID bit in one copy and store */
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| 63 | /* to the EFLAGS reg */
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| 64 | xor eax, 0x00200000
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| 65 | push eax
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| 66 | popfd
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| 67 |
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| 68 | /* ... Get the (hopefully modified) EFLAGS */
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| 69 | pushfd
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| 70 | pop Reax
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| 71 | }
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| 72 |
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| 73 | if (Reax == Recx) return 0; /* CPUID not supported */
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| 74 |
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| 75 | cpuid(0);
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| 76 |
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| 77 | if (Rebx == 0x756e6547 &&
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| 78 | Redx == 0x49656e69 &&
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| 79 | Recx == 0x6c65746e) {
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| 80 |
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| 81 | /* intel */
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| 82 | inteltest:
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| 83 | cpuid(1);
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| 84 | if ((Redx & 0x00800000) == 0) return 0;
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| 85 | rval = MM_MMX;
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| 86 | if (Redx & 0x02000000) rval |= MM_MMXEXT | MM_SSE;
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| 87 | if (Redx & 0x04000000) rval |= MM_SSE2;
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| 88 | return rval;
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| 89 | } else if (Rebx == 0x68747541 &&
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| 90 | Redx == 0x69746e65 &&
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| 91 | Recx == 0x444d4163) {
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| 92 | /* AMD */
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| 93 | cpuid(0x80000000);
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| 94 | if ((unsigned)Reax < 0x80000001) goto inteltest;
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| 95 | cpuid(0x80000001);
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| 96 | if ((Redx & 0x00800000) == 0) return 0;
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| 97 | rval = MM_MMX;
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| 98 | if (Redx & 0x80000000) rval |= MM_3DNOW;
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| 99 | if (Redx & 0x00400000) rval |= MM_MMXEXT;
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| 100 | return rval;
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| 101 | } else if (Rebx == 0x746e6543 &&
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| 102 | Redx == 0x48727561 &&
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| 103 | Recx == 0x736c7561) { /* "CentaurHauls" */
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| 104 | /* VIA C3 */
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| 105 | cpuid(0x80000000);
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| 106 | if ((unsigned)Reax < 0x80000001) goto inteltest;
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| 107 | cpuid(0x80000001);
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| 108 | rval = 0;
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| 109 | if( Redx & ( 1 << 31) ) rval |= MM_3DNOW;
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| 110 | if( Redx & ( 1 << 23) ) rval |= MM_MMX;
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| 111 | if( Redx & ( 1 << 24) ) rval |= MM_MMXEXT;
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| 112 | return rval;
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| 113 | } else if (Rebx == 0x69727943 &&
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| 114 | Redx == 0x736e4978 &&
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| 115 | Recx == 0x64616574) {
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| 116 | /* Cyrix Section */
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| 117 | /* See if extended CPUID level 80000001 is supported */
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| 118 | /* The value of CPUID/80000001 for the 6x86MX is undefined
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| 119 | according to the Cyrix CPU Detection Guide (Preliminary
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| 120 | Rev. 1.01 table 1), so we'll check the value of eax for
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| 121 | CPUID/0 to see if standard CPUID level 2 is supported.
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| 122 | According to the table, the only CPU which supports level
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| 123 | 2 is also the only one which supports extended CPUID levels.
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| 124 | */
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| 125 | if (Reax != 2) goto inteltest;
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| 126 | cpuid(0x80000001);
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| 127 | if ((Reax & 0x00800000) == 0) return 0;
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| 128 | rval = MM_MMX;
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| 129 | if (Reax & 0x01000000) rval |= MM_MMXEXT;
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| 130 | return rval;
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| 131 | } else {
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| 132 | return 0;
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| 133 | }
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| 134 | }
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| 135 | #pragma enable_message (200)
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| 136 |
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| 137 | #ifdef __TEST__
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| 138 | int main ( void )
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| 139 | {
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| 140 | int mm_flags;
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| 141 | mm_flags = mm_support();
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| 142 | printf("mm_support = 0x%08u\n",mm_flags);
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| 143 | return 0;
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| 144 | }
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| 145 | #endif
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