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52 | vana | 1 | /* |
2 | # |
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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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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 | |
58 | vana | 35 | |
57 | vana | 36 | void fpu_context_save(fpu_context_t *fctx) |
52 | vana | 37 | { |
38 | } |
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39 | |||
40 | |||
57 | vana | 41 | void fpu_context_restore(fpu_context_t *fctx) |
52 | vana | 42 | { |
73 | vana | 43 | if(THREAD==CPU->arch.fpu_owner) {reset_TS_flag(); } |
44 | else {set_TS_flag(); ((CPU->arch).fpu_owner)->fpu_context_engaged=1;} |
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52 | vana | 45 | } |
46 | |||
47 | |||
57 | vana | 48 | void fpu_lazy_context_save(fpu_context_t *fctx) |
52 | vana | 49 | { |
73 | vana | 50 | asm( |
51 | "mov %0,%%eax;" |
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52 | "fxsave (%%eax);" |
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53 | "ret;" |
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54 | :"=m"(fctx) |
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55 | : |
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56 | :"%eax" |
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57 | ); |
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52 | vana | 58 | } |
59 | |||
57 | vana | 60 | void fpu_lazy_context_restore(fpu_context_t *fctx) |
52 | vana | 61 | { |
73 | vana | 62 | asm( |
63 | "mov %0,%%eax;" |
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64 | "fxrstor (%%eax);" |
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65 | "ret;" |
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66 | :"=m"(fctx) |
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67 | : |
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68 | :"%eax" |
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69 | ); |
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52 | vana | 70 | } |
73 | vana | 71 | |
72 | void fpu_init(void) |
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73 | { |
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74 | asm( |
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75 | "fninit;" |
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76 | ); |
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77 | } |
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78 |