WebSVN – HelenOS-historic – Diff – /kernel/trunk/arch/ia32/include/cpuid.h


/*
 * 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 __ia32_CPUID_H__
#define __ia32_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
 

Rev 534	Rev 860
1	/*	1	/*
2	* Copyright (C) 2001-2004 Jakub Jermar	2	* Copyright (C) 2001-2004 Jakub Jermar
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	13	* documentation and/or other materials provided with the distribution.
14	* - The name of the author may not be used to endorse or promote products	14	* - The name of the author may not be used to endorse or promote products
15	* derived from this software without specific prior written permission.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF	25	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	#ifndef __CPUID_H__	29	#ifndef __ia32_CPUID_H__
30	#define __CPUID_H__	30	#define __ia32_CPUID_H__
31		31
32	#include <arch/types.h>	32	#include <arch/types.h>
33		33
34	struct cpu_info {	34	struct cpu_info {
35	__u32 cpuid_eax;	35	__u32 cpuid_eax;
36	__u32 cpuid_ebx;	36	__u32 cpuid_ebx;
37	__u32 cpuid_ecx;	37	__u32 cpuid_ecx;
38	__u32 cpuid_edx;	38	__u32 cpuid_edx;
39	} __attribute__ ((packed));	39	} __attribute__ ((packed));
40		40
41	static inline __u32 has_cpuid(void)	41	static inline __u32 has_cpuid(void)
42	{	42	{
43	__u32 val, ret;	43	__u32 val, ret;
44		44
45	__asm__ volatile (	45	__asm__ volatile (
46	"pushf\n" /* read flags */	46	"pushf\n" /* read flags */
47	"popl %0\n"	47	"popl %0\n"
48	"movl %0, %1\n"	48	"movl %0, %1\n"
49		49
50	"btcl $21, %1\n" /* swap the ID bit */	50	"btcl $21, %1\n" /* swap the ID bit */
51		51
52	"pushl %1\n" /* propagate the change into flags */	52	"pushl %1\n" /* propagate the change into flags */
53	"popf\n"	53	"popf\n"
54	"pushf\n"	54	"pushf\n"
55	"popl %1\n"	55	"popl %1\n"
56		56
57	"andl $(1 << 21), %0\n" /* interrested only in ID bit */	57	"andl $(1 << 21), %0\n" /* interrested only in ID bit */
58	"andl $(1 << 21), %1\n"	58	"andl $(1 << 21), %1\n"
59	"xorl %1, %0\n"	59	"xorl %1, %0\n"
60	: "=r" (ret), "=r" (val)	60	: "=r" (ret), "=r" (val)
61	);	61	);
62		62
63	return ret;	63	return ret;
64	}	64	}
65		65
66	static inline void cpuid(__u32 cmd, struct cpu_info *info)	66	static inline void cpuid(__u32 cmd, struct cpu_info *info)
67	{	67	{
68	__asm__ volatile (	68	__asm__ volatile (
69	"movl %4, %%eax\n"	69	"movl %4, %%eax\n"
70	"cpuid\n"	70	"cpuid\n"
71		71
72	"movl %%eax, %0\n"	72	"movl %%eax, %0\n"
73	"movl %%ebx, %1\n"	73	"movl %%ebx, %1\n"
74	"movl %%ecx, %2\n"	74	"movl %%ecx, %2\n"
75	"movl %%edx, %3\n"	75	"movl %%edx, %3\n"
76	: "=m" (info->cpuid_eax), "=m" (info->cpuid_ebx), "=m" (info->cpuid_ecx), "=m" (info->cpuid_edx)	76	: "=m" (info->cpuid_eax), "=m" (info->cpuid_ebx), "=m" (info->cpuid_ecx), "=m" (info->cpuid_edx)
77	: "m" (cmd)	77	: "m" (cmd)
78	: "eax", "ebx", "ecx", "edx"	78	: "eax", "ebx", "ecx", "edx"
79	);	79	);
80	}	80	}
81		81
82	#endif	82	#endif
83		83

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/ia32/include/cpuid.h @ 1019 – Rev 534 → 860