Subversion Repositories HelenOS-historic

Rev

Rev 906 | Rev 1702 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
52 vana 1 
/*
92 jermar 2 
 * Copyright (C) 2005 Jakub Vana
3 
 * All rights reserved.
4 
 *
5 
 * Redistribution and use in source and binary forms, with or without
6 
 * modification, are permitted provided that the following conditions
7 
 * are met:
8 
 *
9 
 * - Redistributions of source code must retain the above copyright
10 
 *   notice, this list of conditions and the following disclaimer.
11 
 * - Redistributions in binary form must reproduce the above copyright
12 
 *   notice, this list of conditions and the following disclaimer in the
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
15 
 *   derived from this software without specific prior written permission.
16 
 *
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
19 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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
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
26 
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 
 *
28 
 */
52 vana 29 
 
30 
#include <fpu_context.h>
58 vana 31 
#include <arch.h>
32 
#include <cpu.h>
52 vana 33 
 
1019 vana 34 
typedef void (*fpu_context_function)(fpu_context_t *fctx);
35 
 
36 
static fpu_context_function fpu_save,fpu_restore;
37 
 
38 
 
39 
 
40 
static void fpu_context_f_save(fpu_context_t *fctx)
52 vana 41 
{
281 palkovsky 42 
    __asm__ volatile (
257 palkovsky 43 
        "fnsave %0"
281 palkovsky 44 
        : "=m"(*fctx)
257 palkovsky 45 
        );
52 vana 46 
}
47 
 
1019 vana 48 
static void fpu_context_f_restore(fpu_context_t *fctx)
52 vana 49 
{
281 palkovsky 50 
    __asm__ volatile (
257 palkovsky 51 
        "frstor %0"
281 palkovsky 52 
        : "=m"(*fctx)
257 palkovsky 53 
        );
52 vana 54 
}
73 vana 55 
 
1019 vana 56 
static void fpu_context_fx_save(fpu_context_t *fctx)
57 
{
58 
    __asm__ volatile (
59 
        "fxsave %0"
60 
        : "=m"(*fctx)
61 
        );
62 
}
63 
 
64 
static void fpu_context_fx_restore(fpu_context_t *fctx)
65 
{
66 
    __asm__ volatile (
67 
        "fxrstor %0"
68 
        : "=m"(*fctx)
69 
        );
70 
}
71 
 
72 
/*
73 
    Setup using fxsr instruction
74 
*/
75 
void fpu_fxsr(void)
76 
{
77 
    fpu_save=fpu_context_fx_save;
78 
    fpu_restore=fpu_context_fx_restore;
79 
}
80 
/*
81 
    Setup using not fxsr instruction
82 
*/
83 
void fpu_fsr(void)
84 
{
85 
    fpu_save=fpu_context_f_save;
86 
    fpu_restore=fpu_context_f_restore;
87 
}
88 
 
89 
 
90 
 
91 
void fpu_context_save(fpu_context_t *fctx)
92 
{
93 
    fpu_save(fctx);
94 
}
95 
 
96 
void fpu_context_restore(fpu_context_t *fctx)
97 
{
98 
    fpu_restore(fctx);
99 
}
100 
 
101 
 
102 
 
906 palkovsky 103 
void fpu_init()
73 vana 104 
{
1019 vana 105 
    __u32 help0=0,help1=0;
281 palkovsky 106 
    __asm__ volatile (
1019 vana 107 
        "fninit;\n"
108 
        "stmxcsr %0\n"
109 
        "mov %0,%1;\n"
110 
        "or %2,%1;\n"
111 
        "mov %1,%0;\n"
112 
        "ldmxcsr %0;\n"
113 
        :"+m"(help0),"+r"(help1)
114 
        :"i"(0x1f80)
92 jermar 115 
    );
73 vana 116 
}