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| Rev | Author | Line No. | Line |
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| 52 | vana | 1 | /* |
| 2071 | jermar | 2 | * Copyright (c) 2005 Jakub Vana |
| 92 | jermar | 3 | * All rights reserved. |
| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 1702 | cejka | 27 | */ |
| 28 | |||
| 1877 | jermar | 29 | /** @addtogroup ia32 |
| 1702 | cejka | 30 | * @{ |
| 31 | */ |
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| 32 | /** @file |
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| 92 | jermar | 33 | * |
| 34 | */ |
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| 52 | vana | 35 | |
| 36 | #include <fpu_context.h> |
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| 58 | vana | 37 | #include <arch.h> |
| 38 | #include <cpu.h> |
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| 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) |
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| 52 | vana | 45 | { |
| 2082 | decky | 46 | asm volatile ( |
| 4016 | decky | 47 | "fnsave %[fctx]" |
| 48 | : [fctx] "=m" (*fctx) |
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| 49 | ); |
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| 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 ( |
| 4016 | decky | 55 | "frstor %[fctx]" |
| 56 | : [fctx] "=m" (*fctx) |
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| 57 | ); |
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| 52 | vana | 58 | } |
| 73 | vana | 59 | |
| 1019 | vana | 60 | static void fpu_context_fx_save(fpu_context_t *fctx) |
| 61 | { |
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| 2082 | decky | 62 | asm volatile ( |
| 4016 | decky | 63 | "fxsave %[fctx]" |
| 64 | : [fctx] "=m" (*fctx) |
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| 65 | ); |
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| 1019 | vana | 66 | } |
| 67 | |||
| 68 | static void fpu_context_fx_restore(fpu_context_t *fctx) |
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| 69 | { |
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| 2082 | decky | 70 | asm volatile ( |
| 4016 | decky | 71 | "fxrstor %[fctx]" |
| 72 | : [fctx] "=m" (*fctx) |
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| 73 | ); |
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| 1019 | vana | 74 | } |
| 75 | |||
| 4016 | decky | 76 | /* Setup using fxsr instruction */ |
| 1019 | vana | 77 | void fpu_fxsr(void) |
| 78 | { |
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| 79 | fpu_save=fpu_context_fx_save; |
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| 80 | fpu_restore=fpu_context_fx_restore; |
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| 81 | } |
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| 4016 | decky | 82 | |
| 83 | /* Setup using not fxsr instruction */ |
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| 1019 | vana | 84 | void fpu_fsr(void) |
| 85 | { |
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| 1877 | jermar | 86 | fpu_save = fpu_context_f_save; |
| 87 | fpu_restore = fpu_context_f_restore; |
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| 1019 | vana | 88 | } |
| 89 | |||
| 90 | void fpu_context_save(fpu_context_t *fctx) |
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| 91 | { |
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| 92 | fpu_save(fctx); |
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| 93 | } |
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| 94 | |||
| 95 | void fpu_context_restore(fpu_context_t *fctx) |
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| 96 | { |
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| 97 | fpu_restore(fctx); |
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| 98 | } |
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| 99 | |||
| 906 | palkovsky | 100 | void fpu_init() |
| 73 | vana | 101 | { |
| 4016 | decky | 102 | uint32_t help0 = 0; |
| 103 | uint32_t help1 = 0; |
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| 104 | |||
| 2082 | decky | 105 | asm volatile ( |
| 4016 | decky | 106 | "fninit\n" |
| 107 | "stmxcsr %[help0]\n" |
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| 108 | "mov %[help0], %[help1]\n" |
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| 109 | "or %[magic], %[help1]\n" |
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| 110 | "mov %[help1], %[help0]\n" |
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| 111 | "ldmxcsr %[help0]\n" |
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| 112 | : [help0] "+m" (help0), [help1] "+r" (help1) |
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| 113 | : [magic] "i" (0x1f80) |
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| 92 | jermar | 114 | ); |
| 73 | vana | 115 | } |
| 1702 | cejka | 116 | |
| 1877 | jermar | 117 | /** @} |
| 1702 | cejka | 118 | */ |