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| 1 | jermar | 1 | /* |
| 2 | * Copyright (C) 2001-2004 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 860 | decky | 29 | #ifndef __ia32_CPUID_H__ |
| 30 | #define __ia32_CPUID_H__ |
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| 1 | jermar | 31 | |
| 32 | #include <arch/types.h> |
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| 33 | |||
| 34 | struct cpu_info { |
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| 35 | __u32 cpuid_eax; |
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| 36 | __u32 cpuid_ebx; |
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| 37 | __u32 cpuid_ecx; |
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| 38 | __u32 cpuid_edx; |
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| 39 | } __attribute__ ((packed)); |
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| 40 | |||
| 408 | decky | 41 | static inline __u32 has_cpuid(void) |
| 42 | { |
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| 43 | __u32 val, ret; |
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| 44 | |||
| 45 | __asm__ volatile ( |
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| 46 | "pushf\n" /* read flags */ |
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| 47 | "popl %0\n" |
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| 48 | "movl %0, %1\n" |
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| 49 | |||
| 50 | "btcl $21, %1\n" /* swap the ID bit */ |
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| 51 | |||
| 52 | "pushl %1\n" /* propagate the change into flags */ |
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| 53 | "popf\n" |
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| 54 | "pushf\n" |
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| 55 | "popl %1\n" |
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| 56 | |||
| 57 | "andl $(1 << 21), %0\n" /* interrested only in ID bit */ |
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| 58 | "andl $(1 << 21), %1\n" |
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| 59 | "xorl %1, %0\n" |
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| 60 | : "=r" (ret), "=r" (val) |
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| 61 | ); |
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| 62 | |||
| 63 | return ret; |
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| 64 | } |
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| 1 | jermar | 65 | |
| 348 | jermar | 66 | static inline void cpuid(__u32 cmd, struct cpu_info *info) |
| 67 | { |
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| 408 | decky | 68 | __asm__ volatile ( |
| 69 | "movl %4, %%eax\n" |
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| 70 | "cpuid\n" |
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| 71 | |||
| 72 | "movl %%eax, %0\n" |
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| 73 | "movl %%ebx, %1\n" |
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| 74 | "movl %%ecx, %2\n" |
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| 75 | "movl %%edx, %3\n" |
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| 76 | : "=m" (info->cpuid_eax), "=m" (info->cpuid_ebx), "=m" (info->cpuid_ecx), "=m" (info->cpuid_edx) |
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| 77 | : "m" (cmd) |
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| 78 | : "eax", "ebx", "ecx", "edx" |
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| 79 | ); |
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| 348 | jermar | 80 | } |
| 1 | jermar | 81 | |
| 82 | #endif |