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1 | /* |
1 | /* |
2 | * Copyright (C) 2005 Jakub Vana |
2 | * Copyright (C) 2005 Jakub Vana |
3 | * All rights reserved. |
3 | * All rights reserved. |
4 | * |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
7 | * are met: |
8 | * |
8 | * |
9 | * - Redistributions of source code must retain the above copyright |
9 | * - Redistributions of source code must retain the above copyright |
10 | * notice, this list of conditions and the following disclaimer. |
10 | * notice, this list of conditions and the following disclaimer. |
11 | * - Redistributions in binary form must reproduce the above copyright |
11 | * - Redistributions in binary form must reproduce the above copyright |
12 | * notice, this list of conditions and the following disclaimer in the |
12 | * notice, this list of conditions and the following disclaimer in the |
13 | * documentation and/or other materials provided with the distribution. |
13 | * documentation and/or other materials provided with the distribution. |
14 | * - The name of the author may not be used to endorse or promote products |
14 | * - The name of the author may not be used to endorse or promote products |
15 | * derived from this software without specific prior written permission. |
15 | * derived from this software without specific prior written permission. |
16 | * |
16 | * |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
27 | * |
27 | * |
28 | */ |
28 | */ |
29 | 29 | ||
30 | #include <fpu_context.h> |
30 | #include <fpu_context.h> |
31 | #include <arch.h> |
31 | #include <arch.h> |
32 | #include <cpu.h> |
32 | #include <cpu.h> |
33 | 33 | ||
34 | void fpu_context_save(fpu_context_t *fctx) |
34 | void fpu_context_save(fpu_context_t *fctx) |
35 | { |
35 | { |
36 | } |
36 | } |
37 | 37 | ||
38 | void fpu_context_restore(fpu_context_t *fctx) |
38 | void fpu_context_restore(fpu_context_t *fctx) |
39 | { |
39 | { |
40 | if(THREAD==CPU->fpu_owner) |
40 | if(THREAD==CPU->fpu_owner) |
41 | reset_TS_flag(); |
41 | reset_TS_flag(); |
42 | else { |
42 | else |
43 | set_TS_flag(); |
43 | set_TS_flag(); |
44 | if (CPU->fpu_owner != NULL) |
- | |
45 | CPU->fpu_owner->fpu_context_engaged=1; |
- | |
46 | } |
- | |
47 | } |
44 | } |
48 | 45 | ||
49 | 46 | ||
50 | void fpu_lazy_context_save(fpu_context_t *fctx) |
47 | void fpu_lazy_context_save(fpu_context_t *fctx) |
51 | { |
48 | { |
52 | /* TODO: We need malloc that allocates on 16-byte boundary !! */ |
49 | /* TODO: We need malloc that allocates on 16-byte boundary !! */ |
53 | if (((__u64)fctx) & 0xf) |
50 | if (((__u64)fctx) & 0xf) |
54 | fctx = (fpu_context_t *)((((__u64)fctx) | 0xf) + 1); |
51 | fctx = (fpu_context_t *)((((__u64)fctx) | 0xf) + 1); |
55 | 52 | ||
56 | __asm__ volatile ( |
53 | __asm__ volatile ( |
57 | "fxsave %0" |
54 | "fxsave %0" |
58 | : "=m"(*fctx) |
55 | : "=m"(*fctx) |
59 | ); |
56 | ); |
60 | } |
57 | } |
61 | 58 | ||
62 | void fpu_lazy_context_restore(fpu_context_t *fctx) |
59 | void fpu_lazy_context_restore(fpu_context_t *fctx) |
63 | { |
60 | { |
64 | /* TODO: We need malloc that allocates on 16-byte boundary !! */ |
61 | /* TODO: We need malloc that allocates on 16-byte boundary !! */ |
65 | if (((__u64)fctx) & 0xf) |
62 | if (((__u64)fctx) & 0xf) |
66 | fctx = (fpu_context_t *)((((__u64)fctx) | 0xf) + 1); |
63 | fctx = (fpu_context_t *)((((__u64)fctx) | 0xf) + 1); |
67 | __asm__ volatile ( |
64 | __asm__ volatile ( |
68 | "fxrstor %0" |
65 | "fxrstor %0" |
69 | : "=m"(*fctx) |
66 | : "=m"(*fctx) |
70 | ); |
67 | ); |
71 | } |
68 | } |
72 | 69 | ||
73 | void fpu_init(void) |
70 | void fpu_init(void) |
74 | { |
71 | { |
75 | __asm__ volatile ( |
72 | __asm__ volatile ( |
76 | "fninit;" |
73 | "fninit;" |
77 | ); |
74 | ); |
78 | } |
75 | } |
79 | 76 |