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| Rev | Author | Line No. | Line |
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| 282 | palkovsky | 1 | /* |
| 2 | * Copyright (C) 2005 Jakub Vana |
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| 3 | * All rights reserved. |
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| 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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| 27 | * |
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| 28 | */ |
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| 29 | |||
| 30 | #include <fpu_context.h> |
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| 31 | #include <arch.h> |
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| 32 | #include <cpu.h> |
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| 33 | |||
| 34 | void fpu_context_save(fpu_context_t *fctx) |
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| 35 | { |
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| 36 | } |
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| 37 | |||
| 38 | void fpu_context_restore(fpu_context_t *fctx) |
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| 39 | { |
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| 40 | if(THREAD==CPU->fpu_owner) |
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| 41 | reset_TS_flag(); |
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| 42 | else { |
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| 43 | set_TS_flag(); |
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| 44 | if (CPU->fpu_owner != NULL) |
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| 45 | CPU->fpu_owner->fpu_context_engaged=1; |
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| 46 | } |
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| 47 | } |
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| 48 | |||
| 49 | |||
| 50 | void fpu_lazy_context_save(fpu_context_t *fctx) |
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| 51 | { |
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| 52 | /* TODO: We need malloc that allocates on 16-byte boundary !! */ |
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| 53 | if (((__u64)fctx) & 0xf) |
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| 54 | fctx = (fpu_context_t *)((((__u64)fctx) | 0xf) + 1); |
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| 55 | |||
| 56 | __asm__ volatile ( |
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| 57 | "fxsave %0" |
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| 58 | : "=m"(*fctx) |
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| 59 | ); |
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| 60 | } |
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| 61 | |||
| 62 | void fpu_lazy_context_restore(fpu_context_t *fctx) |
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| 63 | { |
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| 64 | /* TODO: We need malloc that allocates on 16-byte boundary !! */ |
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| 65 | if (((__u64)fctx) & 0xf) |
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| 66 | fctx = (fpu_context_t *)((((__u64)fctx) | 0xf) + 1); |
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| 67 | __asm__ volatile ( |
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| 68 | "fxrstor %0" |
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| 69 | : "=m"(*fctx) |
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| 70 | ); |
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| 71 | } |
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| 72 | |||
| 73 | void fpu_init(void) |
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| 74 | { |
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| 75 | __asm__ volatile ( |
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| 76 | "fninit;" |
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| 77 | ); |
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| 78 | } |