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1 | # |
1 | # |
2 | # Copyright (C) 2001-2004 Jakub Jermar |
2 | # Copyright (C) 2001-2004 Jakub Jermar |
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 | .text |
29 | .text |
30 | 30 | ||
31 | .global context_save |
31 | .global context_save |
32 | .global context_restore |
32 | .global context_restore |
33 | 33 | ||
34 | 34 | ||
35 | # |
35 | # |
36 | # save context of this CPU |
36 | # save context of this CPU |
37 | context_save: |
37 | context_save: |
38 | push %ebx |
38 | push %ebx |
39 | 39 | ||
40 | movl 4(%esp),%eax # the caller's return %eip |
40 | movl 4(%esp),%eax # the caller's return %eip |
41 | movl 8(%esp),%ebx # address of the kernel_context variable to save context to |
41 | movl 8(%esp),%ebx # address of the kernel_context variable to save context to |
42 | movl %eax,4(%ebx) # %eip -> ctx->pc |
42 | movl %eax,4(%ebx) # %eip -> ctx->pc |
43 | movl %esp,(%ebx) # %esp -> ctx->sp |
43 | movl %esp,(%ebx) # %esp -> ctx->sp |
44 | 44 | ||
45 | movl %ebx,%eax |
45 | movl %ebx,%eax |
46 | pop %ebx |
46 | pop %ebx |
47 | 47 | ||
48 | movl %ebx,8(%eax) |
48 | movl %ebx,8(%eax) |
49 | movl %ecx,12(%eax) |
49 | movl %ecx,12(%eax) |
50 | movl %edx,16(%eax) |
50 | movl %edx,16(%eax) |
51 | movl %esi,20(%eax) |
51 | movl %esi,20(%eax) |
52 | movl %edi,24(%eax) |
52 | movl %edi,24(%eax) |
53 | movl %ebp,28(%eax) |
53 | movl %ebp,28(%eax) |
54 | 54 | ||
55 | xorl %eax,%eax # context_save returns 1 |
55 | xorl %eax,%eax # context_save returns 1 |
56 | incl %eax |
56 | incl %eax |
57 | ret |
57 | ret |
58 | 58 | ||
59 | # |
59 | # |
60 | # restore saved context on this CPU |
60 | # restore saved context on this CPU |
61 | context_restore: |
61 | context_restore: |
62 | movl 4(%esp),%eax # address of the kernel_context variable to restore context from |
62 | movl 4(%esp),%eax # address of the kernel_context variable to restore context from |
63 | movl (%eax),%esp # ctx->sp -> %esp |
63 | movl (%eax),%esp # ctx->sp -> %esp |
64 | addl $4,%esp # this is for the pop we don't do |
64 | addl $4,%esp # this is for the pop we don't do |
65 | 65 | ||
66 | movl 8(%eax),%ebx |
66 | movl 8(%eax),%ebx |
67 | movl 12(%eax),%ecx |
67 | movl 12(%eax),%ecx |
68 | movl 16(%eax),%edx |
68 | movl 16(%eax),%edx |
69 | movl 20(%eax),%esi |
69 | movl 20(%eax),%esi |
70 | movl 24(%eax),%edi |
70 | movl 24(%eax),%edi |
71 | movl 28(%eax),%ebp |
71 | movl 28(%eax),%ebp |
72 | 72 | ||
73 | movl 4(%eax),%eax |
73 | movl 4(%eax),%eax |
74 | movl %eax,(%esp) # ctx->pc -> saver's return %eip |
74 | movl %eax,(%esp) # ctx->pc -> saver's return %eip |
75 | xorl %eax,%eax # context_restore returns 0 |
75 | xorl %eax,%eax # context_restore returns 0 |
76 | ret |
76 | ret |
77 | 77 | ||
78 | 78 | ||
79 | .global fpu_context_save |
79 | .global fpu_context_save |
80 | fpu_context_save: |
80 | fpu_context_save: |
81 | ret |
81 | ret |
82 | .global fpu_context_restore |
82 | .global fpu_context_restore |
83 | fpu_context_restore: |
83 | fpu_context_restore: |
84 | ret |
84 | ret |
85 | 85 | ||
86 | .global fpu_lazy_context_save |
86 | .global fpu_lazy_context_save |
- | 87 | fpu_lazy_context_save: |
|
87 | mov 4(%esp),%eax; |
88 | mov 4(%esp),%eax; |
88 | fxsave (%eax) |
89 | fxsave (%eax) |
89 | xor %eax,%eax; |
90 | xor %eax,%eax; |
90 | ret; |
91 | ret; |
91 | .global fpu_lazy_context_restore |
92 | .global fpu_lazy_context_restore |
- | 93 | fpu_lazy_context_restore: |
|
92 | mov 4(%esp),%eax; |
94 | mov 4(%esp),%eax; |
93 | fxrstor (%eax) |
95 | fxrstor (%eax) |
94 | xor %eax,%eax; |
96 | xor %eax,%eax; |
95 | ret; |
97 | ret; |
96 | 98 | ||
97 | 99 |