Subversion Repositories HelenOS

Rev

Rev 2927 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
52 vana 1 
/*
2071 jermar 2 
 * Copyright (c) 2005 Jakub Vana
92 jermar 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.
1702 cejka 27 
 */
28 
 
1877 jermar 29 
/** @addtogroup ia32   
1702 cejka 30 
 * @{
31 
 */
32 
/** @file
92 jermar 33 
 *
34 
 */
52 vana 35 
 
36 
#include <fpu_context.h>
58 vana 37 
#include <arch.h>
38 
#include <cpu.h>
52 vana 39 
 
1019 vana 40 
typedef void (*fpu_context_function)(fpu_context_t *fctx);
41 
 
1877 jermar 42 
static fpu_context_function fpu_save, fpu_restore;
1019 vana 43 
 
44 
static void fpu_context_f_save(fpu_context_t *fctx)
52 vana 45 
{
2082 decky 46 
    asm volatile (
4345 svoboda 47 
        "fnsave %[fctx]"
48 
        : [fctx] "=m" (*fctx)
49 
    );
52 vana 50 
}
51 
 
1019 vana 52 
static void fpu_context_f_restore(fpu_context_t *fctx)
52 vana 53 
{
2082 decky 54 
    asm volatile (
4345 svoboda 55 
        "frstor %[fctx]"
56 
        : [fctx] "=m" (*fctx)
57 
    );
52 vana 58 
}
73 vana 59 
 
1019 vana 60 
static void fpu_context_fx_save(fpu_context_t *fctx)
61 
{
2082 decky 62 
    asm volatile (
4345 svoboda 63 
        "fxsave %[fctx]"
64 
        : [fctx] "=m" (*fctx)
65 
    );
1019 vana 66 
}
67 
 
68 
static void fpu_context_fx_restore(fpu_context_t *fctx)
69 
{
2082 decky 70 
    asm volatile (
4345 svoboda 71 
        "fxrstor %[fctx]"
72 
        : [fctx] "=m" (*fctx)
73 
    );
1019 vana 74 
}
75 
 
4345 svoboda 76 
/* Setup using fxsr instruction */
1019 vana 77 
void fpu_fxsr(void)
78 
{
79 
    fpu_save=fpu_context_fx_save;
80 
    fpu_restore=fpu_context_fx_restore;
81 
}
4345 svoboda 82 
 
83 
/* Setup using not fxsr instruction */
1019 vana 84 
void fpu_fsr(void)
85 
{
1877 jermar 86 
    fpu_save = fpu_context_f_save;
87 
    fpu_restore = fpu_context_f_restore;
1019 vana 88 
}
89 
 
90 
void fpu_context_save(fpu_context_t *fctx)
91 
{
92 
    fpu_save(fctx);
93 
}
94 
 
95 
void fpu_context_restore(fpu_context_t *fctx)
96 
{
97 
    fpu_restore(fctx);
98 
}
99 
 
906 palkovsky 100 
void fpu_init()
73 vana 101 
{
4345 svoboda 102 
    uint32_t help0 = 0;
103 
    uint32_t help1 = 0;
104 
 
2082 decky 105 
    asm volatile (
4345 svoboda 106 
        "fninit\n"
107 
        "stmxcsr %[help0]\n"
108 
        "mov %[help0], %[help1]\n"
109 
        "or %[magic], %[help1]\n"
110 
        "mov %[help1], %[help0]\n"
111 
        "ldmxcsr %[help0]\n"
112 
        : [help0] "+m" (help0), [help1] "+r" (help1)
113 
        : [magic] "i" (0x1f80)
92 jermar 114 
    );
73 vana 115 
}
1702 cejka 116 
 
1877 jermar 117 
/** @}
1702 cejka 118 
 */