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1 jermar 1
/*
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 * Copyright (C) 2001-2004 Jakub Jermar
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#ifndef __CPUID_H__
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#define __CPUID_H__
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#include <arch/types.h>
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struct cpu_info {
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    __u32 cpuid_eax;
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    __u32 cpuid_ebx;
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    __u32 cpuid_ecx;
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    __u32 cpuid_edx;
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} __attribute__ ((packed));
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static inline __u32 has_cpuid(void)
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{
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    __u32 val, ret;
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    __asm__ volatile (
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        "pushf\n"               /* read flags */
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        "popl %0\n"
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        "movl %0, %1\n"
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        "btcl $21, %1\n"        /* swap the ID bit */
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        "pushl %1\n"            /* propagate the change into flags */
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        "popf\n"
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        "pushf\n"
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        "popl %1\n"
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        "andl $(1 << 21), %0\n" /* interrested only in ID bit */
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        "andl $(1 << 21), %1\n"
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        "xorl %1, %0\n"
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        : "=r" (ret), "=r" (val)
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    );
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    return ret;
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}
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static inline void cpuid(__u32 cmd, struct cpu_info *info)
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{
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    __asm__ volatile (
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        "movl %4, %%eax\n"
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        "cpuid\n"
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        "movl %%eax, %0\n"
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        "movl %%ebx, %1\n"
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        "movl %%ecx, %2\n"
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        "movl %%edx, %3\n"
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        : "=m" (info->cpuid_eax), "=m" (info->cpuid_ebx), "=m" (info->cpuid_ecx), "=m" (info->cpuid_edx)
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        : "m" (cmd)
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        : "eax", "ebx", "ecx", "edx"
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    );
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}
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#endif