WebSVN – HelenOS – Diff – /trunk/kernel/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 1877	Rev 2071
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	static void fpu_context_f_save(fpu_context_t *fctx)	44	static void fpu_context_f_save(fpu_context_t *fctx)
45	{	45	{
46	__asm__ volatile (	46	__asm__ volatile (
47	"fnsave %0"	47	"fnsave %0"
48	: "=m"(*fctx)	48	: "=m"(*fctx)
49	);	49	);
50	}	50	}
51		51
52	static void fpu_context_f_restore(fpu_context_t *fctx)	52	static void fpu_context_f_restore(fpu_context_t *fctx)
53	{	53	{
54	__asm__ volatile (	54	__asm__ volatile (
55	"frstor %0"	55	"frstor %0"
56	: "=m"(*fctx)	56	: "=m"(*fctx)
57	);	57	);
58	}	58	}
59		59
60	static void fpu_context_fx_save(fpu_context_t *fctx)	60	static void fpu_context_fx_save(fpu_context_t *fctx)
61	{	61	{
62	__asm__ volatile (	62	__asm__ volatile (
63	"fxsave %0"	63	"fxsave %0"
64	: "=m"(*fctx)	64	: "=m"(*fctx)
65	);	65	);
66	}	66	}
67		67
68	static void fpu_context_fx_restore(fpu_context_t *fctx)	68	static void fpu_context_fx_restore(fpu_context_t *fctx)
69	{	69	{
70	__asm__ volatile (	70	__asm__ volatile (
71	"fxrstor %0"	71	"fxrstor %0"
72	: "=m"(*fctx)	72	: "=m"(*fctx)
73	);	73	);
74	}	74	}
75		75
76	/*	76	/*
77	Setup using fxsr instruction	77	Setup using fxsr instruction
78	*/	78	*/
79	void fpu_fxsr(void)	79	void fpu_fxsr(void)
80	{	80	{
81	fpu_save=fpu_context_fx_save;	81	fpu_save=fpu_context_fx_save;
82	fpu_restore=fpu_context_fx_restore;	82	fpu_restore=fpu_context_fx_restore;
83	}	83	}
84	/*	84	/*
85	Setup using not fxsr instruction	85	Setup using not fxsr instruction
86	*/	86	*/
87	void fpu_fsr(void)	87	void fpu_fsr(void)
88	{	88	{
89	fpu_save = fpu_context_f_save;	89	fpu_save = fpu_context_f_save;
90	fpu_restore = fpu_context_f_restore;	90	fpu_restore = fpu_context_f_restore;
91	}	91	}
92		92
93	void fpu_context_save(fpu_context_t *fctx)	93	void fpu_context_save(fpu_context_t *fctx)
94	{	94	{
95	fpu_save(fctx);	95	fpu_save(fctx);
96	}	96	}
97		97
98	void fpu_context_restore(fpu_context_t *fctx)	98	void fpu_context_restore(fpu_context_t *fctx)
99	{	99	{
100	fpu_restore(fctx);	100	fpu_restore(fctx);
101	}	101	}
102		102
103	void fpu_init()	103	void fpu_init()
104	{	104	{
105	uint32_t help0 = 0, help1 = 0;	105	uint32_t help0 = 0, help1 = 0;
106	__asm__ volatile (	106	__asm__ volatile (
107	"fninit;\n"	107	"fninit;\n"
108	"stmxcsr %0\n"	108	"stmxcsr %0\n"
109	"mov %0,%1;\n"	109	"mov %0,%1;\n"
110	"or %2,%1;\n"	110	"or %2,%1;\n"
111	"mov %1,%0;\n"	111	"mov %1,%0;\n"
112	"ldmxcsr %0;\n"	112	"ldmxcsr %0;\n"
113	: "+m" (help0), "+r" (help1)	113	: "+m" (help0), "+r" (help1)
114	: "i" (0x1f80)	114	: "i" (0x1f80)
115	);	115	);
116	}	116	}
117		117
118	/** @}	118	/** @}
119	*/	119	*/
120		120

Subversion Repositories HelenOS

(root)/trunk/kernel/arch/ia32/src/fpu_context.c – Rev 1877 → 2071