WebSVN – HelenOS – Diff – /trunk/kernel/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.
 */
 
/** @addtogroup ia32
 * @{
 */
/** @file
 */
 
#ifndef KERN_ia32_CPUID_H_
#define KERN_ia32_CPUID_H_
 
#include <arch/types.h>
 
typedef struct {
    uint32_t cpuid_eax;
    uint32_t cpuid_ebx;
    uint32_t cpuid_ecx;
    uint32_t cpuid_edx;
} __attribute__ ((packed)) cpu_info_t;
 
struct __cpuid_extended_feature_info {
    unsigned sse3 :  1;
    unsigned      : 31;
} __attribute__ ((packed));
 
typedef union cpuid_extended_feature_info {
 
    struct __cpuid_extended_feature_info bits;
    uint32_t word;
} cpuid_extended_feature_info;
 
 
struct __cpuid_feature_info {
    unsigned            : 23;
    unsigned mmx  :  1;
    unsigned fxsr :  1;
    unsigned sse  :  1;
    unsigned sse2 :  1;
    unsigned      :  5;
} __attribute__ ((packed));
 
typedef union cpuid_feature_info {
 
    struct __cpuid_feature_info bits;
    uint32_t word;
} cpuid_feature_info;
 
 
static inline uint32_t has_cpuid(void)
{
    uint32_t 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(uint32_t cmd, cpu_info_t *info)
{
    asm volatile (
 
        "cpuid\n"
        : "=a" (info->cpuid_eax), "=b" (info->cpuid_ebx), "=c" (info->cpuid_ecx), "=d" (info->cpuid_edx)
        : "a" (cmd)
    );
}
 
#endif
 
/** @}
 */
 

Rev 2316	Rev 2317
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	/** @addtogroup ia32	29	/** @addtogroup ia32
30	* @{	30	* @{
31	*/	31	*/
32	/** @file	32	/** @file
33	*/	33	*/
34		34
35	#ifndef KERN_ia32_CPUID_H_	35	#ifndef KERN_ia32_CPUID_H_
36	#define KERN_ia32_CPUID_H_	36	#define KERN_ia32_CPUID_H_
37		37
38	#include <arch/types.h>	38	#include <arch/types.h>
39		39
40	typedef struct {	40	typedef struct {
41	uint32_t cpuid_eax;	41	uint32_t cpuid_eax;
42	uint32_t cpuid_ebx;	42	uint32_t cpuid_ebx;
43	uint32_t cpuid_ecx;	43	uint32_t cpuid_ecx;
44	uint32_t cpuid_edx;	44	uint32_t cpuid_edx;
45	} __attribute__ ((packed)) cpu_info_t;	45	} __attribute__ ((packed)) cpu_info_t;
46		46
47	struct __cpuid_extended_feature_info {	47	struct __cpuid_extended_feature_info {
48	unsigned sse3 : 1;	48	unsigned sse3 : 1;
49	unsigned : 31;	49	unsigned : 31;
50	} __attribute__ ((packed));	50	} __attribute__ ((packed));
51		51
52	typedef union cpuid_extended_feature_info	52	typedef union cpuid_extended_feature_info {
53	{	-
54	struct __cpuid_extended_feature_info bits;	53	struct __cpuid_extended_feature_info bits;
55	uint32_t word;	54	uint32_t word;
56	}cpuid_extended_feature_info;	55	} cpuid_extended_feature_info;
57		-
58		56
59	struct __cpuid_feature_info {	57	struct __cpuid_feature_info {
60	unsigned : 23;	58	unsigned : 23;
61	unsigned mmx : 1;	59	unsigned mmx : 1;
62	unsigned fxsr : 1;	60	unsigned fxsr : 1;
63	unsigned sse : 1;	61	unsigned sse : 1;
64	unsigned sse2 : 1;	62	unsigned sse2 : 1;
65	unsigned : 5;	63	unsigned : 5;
66	} __attribute__ ((packed));	64	} __attribute__ ((packed));
67		65
68	typedef union cpuid_feature_info	66	typedef union cpuid_feature_info {
69	{	-
70	struct __cpuid_feature_info bits;	67	struct __cpuid_feature_info bits;
71	uint32_t word ;	68	uint32_t word;
72	}cpuid_feature_info;	69	} cpuid_feature_info;
73		70
74		71
75	static inline uint32_t has_cpuid(void)	72	static inline uint32_t has_cpuid(void)
76	{	73	{
77	uint32_t val, ret;	74	uint32_t val, ret;
78		75
79	asm volatile (	76	asm volatile (
80	"pushf\n" /* read flags */	77	"pushf\n" /* read flags */
81	"popl %0\n"	78	"popl %0\n"
82	"movl %0, %1\n"	79	"movl %0, %1\n"
83		80
84	"btcl $21, %1\n" /* swap the ID bit */	81	"btcl $21, %1\n" /* swap the ID bit */
85		82
86	"pushl %1\n" /* propagate the change into flags */	83	"pushl %1\n" /* propagate the change into flags */
87	"popf\n"	84	"popf\n"
88	"pushf\n"	85	"pushf\n"
89	"popl %1\n"	86	"popl %1\n"
90		87
91	"andl $(1 << 21), %0\n" /* interrested only in ID bit */	88	"andl $(1 << 21), %0\n" /* interrested only in ID bit */
92	"andl $(1 << 21), %1\n"	89	"andl $(1 << 21), %1\n"
93	"xorl %1, %0\n"	90	"xorl %1, %0\n"
94	: "=r" (ret), "=r" (val)	91	: "=r" (ret), "=r" (val)
95	);	92	);
96		93
97	return ret;	94	return ret;
98	}	95	}
99		96
100	static inline void cpuid(uint32_t cmd, cpu_info_t *info)	97	static inline void cpuid(uint32_t cmd, cpu_info_t *info)
101	{	98	{
102	asm volatile (	99	asm volatile (
103	"movl %4, %%eax\n"	-
104	"cpuid\n"	100	"cpuid\n"
105	: "=a" (info->cpuid_eax), "=b" (info->cpuid_ebx), "=c" (info->cpuid_ecx), "=d" (info->cpuid_edx)	101	: "=a" (info->cpuid_eax), "=b" (info->cpuid_ebx), "=c" (info->cpuid_ecx), "=d" (info->cpuid_edx)
106	: "m" (cmd)	102	: "a" (cmd)
107	);	103	);
108	}	104	}
109		105
110	#endif	106	#endif
111		107
112	/** @}	108	/** @}
113	*/	109	*/
114		110

Subversion Repositories HelenOS

(root)/trunk/kernel/arch/ia32/include/cpuid.h – Rev 2316 → 2317