| 0,0 → 1,82 |
|---|
| /* |
| * Copyright (C) 2001-2004 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * - The name of the author may not be used to endorse or promote products |
| * derived from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef __CPUID_H__ |
| #define __CPUID_H__ |
| |
| #include <arch/types.h> |
| |
| struct cpu_info { |
| __u32 cpuid_eax; |
| __u32 cpuid_ebx; |
| __u32 cpuid_ecx; |
| __u32 cpuid_edx; |
| } __attribute__ ((packed)); |
| |
| static inline __u32 has_cpuid(void) |
| { |
| __u32 val, ret; |
| |
| __asm__ volatile ( |
| "pushf\n" /* read flags */ |
| "popl %0\n" |
| "movl %0, %1\n" |
| |
| "btcl $21, %1\n" /* swap the ID bit */ |
| |
| "pushl %1\n" /* propagate the change into flags */ |
| "popf\n" |
| "pushf\n" |
| "popl %1\n" |
| |
| "andl $(1 << 21), %0\n" /* interrested only in ID bit */ |
| "andl $(1 << 21), %1\n" |
| "xorl %1, %0\n" |
| : "=r" (ret), "=r" (val) |
| ); |
| |
| return ret; |
| } |
| |
| static inline void cpuid(__u32 cmd, struct cpu_info *info) |
| { |
| __asm__ volatile ( |
| "movl %4, %%eax\n" |
| "cpuid\n" |
| |
| "movl %%eax, %0\n" |
| "movl %%ebx, %1\n" |
| "movl %%ecx, %2\n" |
| "movl %%edx, %3\n" |
| : "=m" (info->cpuid_eax), "=m" (info->cpuid_ebx), "=m" (info->cpuid_ecx), "=m" (info->cpuid_edx) |
| : "m" (cmd) |
| : "eax", "ebx", "ecx", "edx" |
| ); |
| } |
| |
| #endif |