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* Copyright (c) 2001-2004 Jakub Jermar
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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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* - 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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* 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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#ifndef KERN_ia32_CPUID_H_
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#define KERN_ia32_CPUID_H_
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#define INTEL_CPUID_LEVEL 0x00000000
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#define INTEL_CPUID_STANDARD 0x00000001
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#include <arch/types.h>
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} __attribute__ ((packed)) cpu_info_t;
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struct __cpuid_extended_feature_info {
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} __attribute__ ((packed));
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typedef union cpuid_extended_feature_info {
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struct __cpuid_extended_feature_info bits;
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} cpuid_extended_feature_info;
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struct __cpuid_feature_info {
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} __attribute__ ((packed));
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typedef union cpuid_feature_info {
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struct __cpuid_feature_info bits;
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static inline uint32_t has_cpuid(void)
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"pushf\n" /* read flags */
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"movl %[ret], %[val]\n"
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"btcl $21, %[val]\n" /* swap the ID bit */
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"pushl %[val]\n" /* propagate the change into flags */
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"andl $(1 << 21), %[ret]\n" /* interrested only in ID bit */
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"andl $(1 << 21), %[val]\n"
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"xorl %[val], %[ret]\n"
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: [ret] "=r" (ret), [val] "=r" (val)
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static inline void cpuid(uint32_t cmd, cpu_info_t *info)
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: "=a" (info->cpuid_eax), "=b" (info->cpuid_ebx),
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"=c" (info->cpuid_ecx), "=d" (info->cpuid_edx)
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#endif /* !def __ASM__ */