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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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58 | vana | 31 | #include <arch.h> |
32 | #include <cpu.h> |
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52 | vana | 33 | |
57 | vana | 34 | void fpu_context_save(fpu_context_t *fctx) |
52 | vana | 35 | { |
36 | } |
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37 | |||
38 | |||
57 | vana | 39 | void fpu_context_restore(fpu_context_t *fctx) |
52 | vana | 40 | { |
75 | vana | 41 | if(THREAD==CPU->fpu_owner) {reset_TS_flag(); } |
80 | vana | 42 | else |
43 | { |
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44 | set_TS_flag(); |
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45 | if((CPU->fpu_owner)!=NULL)(CPU->fpu_owner)->fpu_context_engaged=1; |
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46 | } |
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52 | vana | 47 | } |
48 | |||
49 | |||
57 | vana | 50 | void fpu_lazy_context_save(fpu_context_t *fctx) |
52 | vana | 51 | { |
90 | vana | 52 | asm |
53 | ( |
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54 | "push %%eax;" |
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55 | "mov 0x8(%%esp),%%eax;" |
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56 | "fnsave (%%eax);" |
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57 | "pop %%eax;" |
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58 | :"=m"(fctx) |
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59 | : |
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60 | :"eax" |
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61 | ); |
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52 | vana | 62 | } |
63 | |||
57 | vana | 64 | void fpu_lazy_context_restore(fpu_context_t *fctx) |
52 | vana | 65 | { |
90 | vana | 66 | asm |
67 | ( |
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68 | "push %%eax;" |
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69 | "mov 0x8(%%esp),%%eax;" |
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70 | "frstor (%%eax);" |
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71 | "pop %%eax;" |
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72 | :"=m"(fctx) |
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73 | : |
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74 | :"eax" |
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75 | ); |
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52 | vana | 76 | } |
73 | vana | 77 | |
78 | void fpu_init(void) |
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79 | { |
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92 | jermar | 80 | asm( |
125 | jermar | 81 | "fninit;" |
92 | jermar | 82 | ); |
73 | vana | 83 | } |