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()
{
    __u32 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 1019	Rev 1702
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	*/
-		28
-		29	/** @addtogroup ia32
-		30	* @{
-		31	*/
-		32	/** @file
27	*	33	*
28	*/	34	*/
29		35
30	#include <fpu_context.h>	36	#include <fpu_context.h>
31	#include <arch.h>	37	#include <arch.h>
32	#include <cpu.h>	38	#include <cpu.h>
33		39
34	typedef void (fpu_context_function)(fpu_context_t fctx);	40	typedef void (fpu_context_function)(fpu_context_t fctx);
35		41
36	static fpu_context_function fpu_save,fpu_restore;	42	static fpu_context_function fpu_save,fpu_restore;
37		43
38		44
39		45
40	static void fpu_context_f_save(fpu_context_t *fctx)	46	static void fpu_context_f_save(fpu_context_t *fctx)
41	{	47	{
42	__asm__ volatile (	48	__asm__ volatile (
43	"fnsave %0"	49	"fnsave %0"
44	: "=m"(*fctx)	50	: "=m"(*fctx)
45	);	51	);
46	}	52	}
47		53
48	static void fpu_context_f_restore(fpu_context_t *fctx)	54	static void fpu_context_f_restore(fpu_context_t *fctx)
49	{	55	{
50	__asm__ volatile (	56	__asm__ volatile (
51	"frstor %0"	57	"frstor %0"
52	: "=m"(*fctx)	58	: "=m"(*fctx)
53	);	59	);
54	}	60	}
55		61
56	static void fpu_context_fx_save(fpu_context_t *fctx)	62	static void fpu_context_fx_save(fpu_context_t *fctx)
57	{	63	{
58	__asm__ volatile (	64	__asm__ volatile (
59	"fxsave %0"	65	"fxsave %0"
60	: "=m"(*fctx)	66	: "=m"(*fctx)
61	);	67	);
62	}	68	}
63		69
64	static void fpu_context_fx_restore(fpu_context_t *fctx)	70	static void fpu_context_fx_restore(fpu_context_t *fctx)
65	{	71	{
66	__asm__ volatile (	72	__asm__ volatile (
67	"fxrstor %0"	73	"fxrstor %0"
68	: "=m"(*fctx)	74	: "=m"(*fctx)
69	);	75	);
70	}	76	}
71		77
72	/*	78	/*
73	Setup using fxsr instruction	79	Setup using fxsr instruction
74	*/	80	*/
75	void fpu_fxsr(void)	81	void fpu_fxsr(void)
76	{	82	{
77	fpu_save=fpu_context_fx_save;	83	fpu_save=fpu_context_fx_save;
78	fpu_restore=fpu_context_fx_restore;	84	fpu_restore=fpu_context_fx_restore;
79	}	85	}
80	/*	86	/*
81	Setup using not fxsr instruction	87	Setup using not fxsr instruction
82	*/	88	*/
83	void fpu_fsr(void)	89	void fpu_fsr(void)
84	{	90	{
85	fpu_save=fpu_context_f_save;	91	fpu_save=fpu_context_f_save;
86	fpu_restore=fpu_context_f_restore;	92	fpu_restore=fpu_context_f_restore;
87	}	93	}
88		94
89		95
90		96
91	void fpu_context_save(fpu_context_t *fctx)	97	void fpu_context_save(fpu_context_t *fctx)
92	{	98	{
93	fpu_save(fctx);	99	fpu_save(fctx);
94	}	100	}
95		101
96	void fpu_context_restore(fpu_context_t *fctx)	102	void fpu_context_restore(fpu_context_t *fctx)
97	{	103	{
98	fpu_restore(fctx);	104	fpu_restore(fctx);
99	}	105	}
100		106
101		107
102		108
103	void fpu_init()	109	void fpu_init()
104	{	110	{
105	__u32 help0=0,help1=0;	111	__u32 help0=0,help1=0;
106	__asm__ volatile (	112	__asm__ volatile (
107	"fninit;\n"	113	"fninit;\n"
108	"stmxcsr %0\n"	114	"stmxcsr %0\n"
109	"mov %0,%1;\n"	115	"mov %0,%1;\n"
110	"or %2,%1;\n"	116	"or %2,%1;\n"
111	"mov %1,%0;\n"	117	"mov %1,%0;\n"
112	"ldmxcsr %0;\n"	118	"ldmxcsr %0;\n"
113	:"+m"(help0),"+r"(help1)	119	:"+m"(help0),"+r"(help1)
114	:"i"(0x1f80)	120	:"i"(0x1f80)
115	);	121	);
116	}	122	}
-		123
-		124	/** @}
-		125	*/
-		126
117		127

Subversion Repositories HelenOS-historic

(root)/kernel/trunk/arch/ia32/src/fpu_context.c – Rev 1019 → 1702