| 1 | /*
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| 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 |
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| 29 | #ifndef __CPUID_H__
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| 30 | #define __CPUID_H__
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| 31 |
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| 32 | #include <arch/types.h>
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| 33 |
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| 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 |
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| 41 | static inline __u32 has_cpuid(void)
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| 42 | {
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| 43 | __u32 val, ret;
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| 44 |
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| 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 |
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| 50 | "btcl $21, %1\n" /* swap the ID bit */
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| 51 |
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| 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 |
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| 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 |
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| 63 | return ret;
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| 64 | }
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| 65 |
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| 66 | static inline void cpuid(__u32 cmd, struct cpu_info *info)
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| 67 | {
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| 68 | __asm__ volatile (
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| 69 | "movl %4, %%eax\n"
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| 70 | "cpuid\n"
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| 71 |
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| 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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| 80 | }
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| 81 |
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| 82 | #endif
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