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52 | vana | 1 | /* |
92 | jermar | 2 | * |
3 | * Copyright (C) 2005 Jakub Vana |
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4 | * All rights reserved. |
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5 | * |
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6 | * Redistribution and use in source and binary forms, with or without |
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7 | * modification, are permitted provided that the following conditions |
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8 | * are met: |
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9 | * |
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10 | * - Redistributions of source code must retain the above copyright |
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11 | * notice, this list of conditions and the following disclaimer. |
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12 | * - Redistributions in binary form must reproduce the above copyright |
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13 | * notice, this list of conditions and the following disclaimer in the |
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14 | * documentation and/or other materials provided with the distribution. |
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15 | * - The name of the author may not be used to endorse or promote products |
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16 | * derived from this software without specific prior written permission. |
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17 | * |
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18 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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19 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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20 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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21 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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22 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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23 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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24 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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25 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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26 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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27 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | * |
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29 | */ |
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52 | vana | 30 | |
31 | #include <fpu_context.h> |
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58 | vana | 32 | #include <arch.h> |
33 | #include <cpu.h> |
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52 | vana | 34 | |
57 | vana | 35 | void fpu_context_save(fpu_context_t *fctx) |
52 | vana | 36 | { |
37 | } |
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38 | |||
39 | |||
57 | vana | 40 | void fpu_context_restore(fpu_context_t *fctx) |
52 | vana | 41 | { |
75 | vana | 42 | if(THREAD==CPU->fpu_owner) {reset_TS_flag(); } |
80 | vana | 43 | else |
44 | { |
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45 | set_TS_flag(); |
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46 | if((CPU->fpu_owner)!=NULL)(CPU->fpu_owner)->fpu_context_engaged=1; |
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47 | } |
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52 | vana | 48 | } |
49 | |||
50 | |||
57 | vana | 51 | void fpu_lazy_context_save(fpu_context_t *fctx) |
52 | vana | 52 | { |
90 | vana | 53 | asm |
54 | ( |
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55 | "push %%eax;" |
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56 | "mov 0x8(%%esp),%%eax;" |
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57 | "fnsave (%%eax);" |
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58 | "pop %%eax;" |
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59 | :"=m"(fctx) |
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60 | : |
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61 | :"eax" |
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62 | ); |
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52 | vana | 63 | } |
64 | |||
57 | vana | 65 | void fpu_lazy_context_restore(fpu_context_t *fctx) |
52 | vana | 66 | { |
90 | vana | 67 | asm |
68 | ( |
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69 | "push %%eax;" |
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70 | "mov 0x8(%%esp),%%eax;" |
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71 | "frstor (%%eax);" |
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72 | "pop %%eax;" |
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73 | :"=m"(fctx) |
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74 | : |
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75 | :"eax" |
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76 | ); |
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52 | vana | 77 | } |
73 | vana | 78 | |
79 | void fpu_init(void) |
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80 | { |
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92 | jermar | 81 | asm( |
82 | "fninit;" |
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83 | ); |
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73 | vana | 84 | } |