WebSVN – HelenOS – Diff – /tags/0.2.0.1/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.
 *
 */
 
#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 1965	Rev 1968
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		29
30	#include <fpu_context.h>	30	#include <fpu_context.h>
31	#include <arch.h>	31	#include <arch.h>
32	#include <cpu.h>	32	#include <cpu.h>
33		33
34	typedef void (fpu_context_function)(fpu_context_t fctx);	34	typedef void (fpu_context_function)(fpu_context_t fctx);
35		35
36	static fpu_context_function fpu_save,fpu_restore;	36	static fpu_context_function fpu_save,fpu_restore;
37		37
38		38
39		39
40	static void fpu_context_f_save(fpu_context_t *fctx)	40	static void fpu_context_f_save(fpu_context_t *fctx)
41	{	41	{
42	__asm__ volatile (	42	__asm__ volatile (
43	"fnsave %0"	43	"fnsave %0"
44	: "=m"(*fctx)	44	: "=m"(*fctx)
45	);	45	);
46	}	46	}
47		47
48	static void fpu_context_f_restore(fpu_context_t *fctx)	48	static void fpu_context_f_restore(fpu_context_t *fctx)
49	{	49	{
50	__asm__ volatile (	50	__asm__ volatile (
51	"frstor %0"	51	"frstor %0"
52	: "=m"(*fctx)	52	: "=m"(*fctx)
53	);	53	);
54	}	54	}
55		55
56	static void fpu_context_fx_save(fpu_context_t *fctx)	56	static void fpu_context_fx_save(fpu_context_t *fctx)
57	{	57	{
58	__asm__ volatile (	58	__asm__ volatile (
59	"fxsave %0"	59	"fxsave %0"
60	: "=m"(*fctx)	60	: "=m"(*fctx)
61	);	61	);
62	}	62	}
63		63
64	static void fpu_context_fx_restore(fpu_context_t *fctx)	64	static void fpu_context_fx_restore(fpu_context_t *fctx)
65	{	65	{
66	__asm__ volatile (	66	__asm__ volatile (
67	"fxrstor %0"	67	"fxrstor %0"
68	: "=m"(*fctx)	68	: "=m"(*fctx)
69	);	69	);
70	}	70	}
71		71
72	/*	72	/*
73	Setup using fxsr instruction	73	Setup using fxsr instruction
74	*/	74	*/
75	void fpu_fxsr(void)	75	void fpu_fxsr(void)
76	{	76	{
77	fpu_save=fpu_context_fx_save;	77	fpu_save=fpu_context_fx_save;
78	fpu_restore=fpu_context_fx_restore;	78	fpu_restore=fpu_context_fx_restore;
79	}	79	}
80	/*	80	/*
81	Setup using not fxsr instruction	81	Setup using not fxsr instruction
82	*/	82	*/
83	void fpu_fsr(void)	83	void fpu_fsr(void)
84	{	84	{
85	fpu_save=fpu_context_f_save;	85	fpu_save=fpu_context_f_save;
86	fpu_restore=fpu_context_f_restore;	86	fpu_restore=fpu_context_f_restore;
87	}	87	}
88		88
89		89
90		90
91	void fpu_context_save(fpu_context_t *fctx)	91	void fpu_context_save(fpu_context_t *fctx)
92	{	92	{
93	fpu_save(fctx);	93	fpu_save(fctx);
94	}	94	}
95		95
96	void fpu_context_restore(fpu_context_t *fctx)	96	void fpu_context_restore(fpu_context_t *fctx)
97	{	97	{
98	fpu_restore(fctx);	98	fpu_restore(fctx);
99	}	99	}
100		100
101		101
102		102
103	void fpu_init()	103	void fpu_init()
104	{	104	{
105	__u32 help0=0,help1=0;	105	__u32 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

Subversion Repositories HelenOS

(root)/tags/0.2.0.1/kernel/arch/ia32/src/fpu_context.c – Rev 1965 → 1968