WebSVN – HelenOS-historic – Diff – /kernel/trunk/arch/ia32/src/fpu_context.c


/*
 * Copyright (C) 2005 Jakub Vana
 * 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
 *
 */
 
#include <fpu_context.h>
#include <arch.h>
#include <cpu.h>
 
typedef void (*fpu_context_function)(fpu_context_t *fctx);
 
static fpu_context_function fpu_save,fpu_restore;
 
 
 
static void fpu_context_f_save(fpu_context_t *fctx)
{
    __asm__ volatile (
        "fnsave %0"
        : "=m"(*fctx)
        );
}
 
static void fpu_context_f_restore(fpu_context_t *fctx)
{
    __asm__ volatile (
        "frstor %0"
        : "=m"(*fctx)
        );
}
 
static void fpu_context_fx_save(fpu_context_t *fctx)
{
    __asm__ volatile (
        "fxsave %0"
        : "=m"(*fctx)
        );
}
 
static void fpu_context_fx_restore(fpu_context_t *fctx)
{
    __asm__ volatile (
        "fxrstor %0"
        : "=m"(*fctx)
        );
}
 
/*
    Setup using fxsr instruction
*/
void fpu_fxsr(void)
{
    fpu_save=fpu_context_fx_save;
    fpu_restore=fpu_context_fx_restore;
}
/*
    Setup using not fxsr instruction
*/
void fpu_fsr(void)
{
    fpu_save=fpu_context_f_save;
    fpu_restore=fpu_context_f_restore;
}
 
 
 
void fpu_context_save(fpu_context_t *fctx)
{
    fpu_save(fctx);
}
 
void fpu_context_restore(fpu_context_t *fctx)
{
    fpu_restore(fctx);
}
 
 
 
void fpu_init()
{
    uint32_t help0=0,help1=0;
    __asm__ volatile (
        "fninit;\n"
        "stmxcsr %0\n"
        "mov %0,%1;\n"
        "or %2,%1;\n"
        "mov %1,%0;\n"
        "ldmxcsr %0;\n"
        :"+m"(help0),"+r"(help1)
        :"i"(0x1f80)
    );
}
 
 /** @}
 */
 
 

Rev 1702	Rev 1780
1	/*	1	/*
2	* Copyright (C) 2005 Jakub Vana	2	* Copyright (C) 2005 Jakub Vana
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		35
36	#include <fpu_context.h>	36	#include <fpu_context.h>
37	#include <arch.h>	37	#include <arch.h>
38	#include <cpu.h>	38	#include <cpu.h>
39		39
40	typedef void (fpu_context_function)(fpu_context_t fctx);	40	typedef void (fpu_context_function)(fpu_context_t fctx);
41		41
42	static fpu_context_function fpu_save,fpu_restore;	42	static fpu_context_function fpu_save,fpu_restore;
43		43
44		44
45		45
46	static void fpu_context_f_save(fpu_context_t *fctx)	46	static void fpu_context_f_save(fpu_context_t *fctx)
47	{	47	{
48	__asm__ volatile (	48	__asm__ volatile (
49	"fnsave %0"	49	"fnsave %0"
50	: "=m"(*fctx)	50	: "=m"(*fctx)
51	);	51	);
52	}	52	}
53		53
54	static void fpu_context_f_restore(fpu_context_t *fctx)	54	static void fpu_context_f_restore(fpu_context_t *fctx)
55	{	55	{
56	__asm__ volatile (	56	__asm__ volatile (
57	"frstor %0"	57	"frstor %0"
58	: "=m"(*fctx)	58	: "=m"(*fctx)
59	);	59	);
60	}	60	}
61		61
62	static void fpu_context_fx_save(fpu_context_t *fctx)	62	static void fpu_context_fx_save(fpu_context_t *fctx)
63	{	63	{
64	__asm__ volatile (	64	__asm__ volatile (
65	"fxsave %0"	65	"fxsave %0"
66	: "=m"(*fctx)	66	: "=m"(*fctx)
67	);	67	);
68	}	68	}
69		69
70	static void fpu_context_fx_restore(fpu_context_t *fctx)	70	static void fpu_context_fx_restore(fpu_context_t *fctx)
71	{	71	{
72	__asm__ volatile (	72	__asm__ volatile (
73	"fxrstor %0"	73	"fxrstor %0"
74	: "=m"(*fctx)	74	: "=m"(*fctx)
75	);	75	);
76	}	76	}
77		77
78	/*	78	/*
79	Setup using fxsr instruction	79	Setup using fxsr instruction
80	*/	80	*/
81	void fpu_fxsr(void)	81	void fpu_fxsr(void)
82	{	82	{
83	fpu_save=fpu_context_fx_save;	83	fpu_save=fpu_context_fx_save;
84	fpu_restore=fpu_context_fx_restore;	84	fpu_restore=fpu_context_fx_restore;
85	}	85	}
86	/*	86	/*
87	Setup using not fxsr instruction	87	Setup using not fxsr instruction
88	*/	88	*/
89	void fpu_fsr(void)	89	void fpu_fsr(void)
90	{	90	{
91	fpu_save=fpu_context_f_save;	91	fpu_save=fpu_context_f_save;
92	fpu_restore=fpu_context_f_restore;	92	fpu_restore=fpu_context_f_restore;
93	}	93	}
94		94
95		95
96		96
97	void fpu_context_save(fpu_context_t *fctx)	97	void fpu_context_save(fpu_context_t *fctx)
98	{	98	{
99	fpu_save(fctx);	99	fpu_save(fctx);
100	}	100	}
101		101
102	void fpu_context_restore(fpu_context_t *fctx)	102	void fpu_context_restore(fpu_context_t *fctx)
103	{	103	{
104	fpu_restore(fctx);	104	fpu_restore(fctx);
105	}	105	}
106		106
107		107
108		108
109	void fpu_init()	109	void fpu_init()
110	{	110	{
111	__u32 help0=0,help1=0;	111	uint32_t help0=0,help1=0;
112	__asm__ volatile (	112	__asm__ volatile (
113	"fninit;\n"	113	"fninit;\n"
114	"stmxcsr %0\n"	114	"stmxcsr %0\n"
115	"mov %0,%1;\n"	115	"mov %0,%1;\n"
116	"or %2,%1;\n"	116	"or %2,%1;\n"
117	"mov %1,%0;\n"	117	"mov %1,%0;\n"
118	"ldmxcsr %0;\n"	118	"ldmxcsr %0;\n"
119	:"+m"(help0),"+r"(help1)	119	:"+m"(help0),"+r"(help1)
120	:"i"(0x1f80)	120	:"i"(0x1f80)
121	);	121	);
122	}	122	}
123		123
124	/** @}	124	/** @}
125	*/	125	*/
126		126
127		127

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/ia32/src/fpu_context.c – Rev 1702 → 1780