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| Rev | Author | Line No. | Line |
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| 52 | vana | 1 | /* |
| 92 | jermar | 2 | * Copyright (C) 2005 Jakub Vana |
| 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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| 52 | vana | 29 | |
| 30 | #include <fpu_context.h> |
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| 326 | palkovsky | 31 | #include <arch.h> |
| 32 | #include <arch/cp0.h> |
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| 546 | palkovsky | 33 | #include <proc/thread.h> |
| 52 | vana | 34 | |
| 326 | palkovsky | 35 | void fpu_disable(void) |
| 36 | { |
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| 37 | #ifdef HAVE_FPU |
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| 38 | cp0_status_write(cp0_status_read() & ~cp0_status_fpu_bit); |
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| 39 | if (THREAD && THREAD->pstate) |
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| 40 | THREAD->pstate->status &= ~cp0_status_fpu_bit; |
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| 41 | #endif |
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| 42 | } |
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| 43 | |||
| 44 | void fpu_enable(void) |
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| 52 | vana | 45 | { |
| 326 | palkovsky | 46 | #ifdef HAVE_FPU |
| 47 | cp0_status_write(cp0_status_read() | cp0_status_fpu_bit); |
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| 48 | if (THREAD && THREAD->pstate) |
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| 49 | THREAD->pstate->status |= cp0_status_fpu_bit; |
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| 50 | #endif |
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| 52 | vana | 51 | } |
| 52 | |||
| 827 | palkovsky | 53 | void fpu_init(fpu_context_t *fctx) |
| 52 | vana | 54 | { |
| 326 | palkovsky | 55 | /* TODO: Zero all registers */ |
| 52 | vana | 56 | } |