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1 | /* |
1 | /* |
2 | * Copyright (C) 2006 Jakub Jermar |
2 | * Copyright (C) 2006 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 | #include <as.h> |
29 | #include <as.h> |
30 | #include <libc.h> |
30 | #include <libc.h> |
31 | #include <unistd.h> |
31 | #include <unistd.h> |
32 | #include <kernel/mm/as_arg.h> |
32 | #include <kernel/mm/as_arg.h> |
33 | #include <task.h> |
33 | #include <task.h> |
34 | 34 | ||
35 | /** Create address space area. |
35 | /** Create address space area. |
36 | * |
36 | * |
37 | * @param address Virtual address where to place new address space area. |
37 | * @param address Virtual address where to place new address space area. |
38 | * @param size Size of the area. |
38 | * @param size Size of the area. |
39 | * @param flags Flags describing type of the area. |
39 | * @param flags Flags describing type of the area. |
40 | * |
40 | * |
41 | * @return address on success, (void *) -1 otherwise. |
41 | * @return address on success, (void *) -1 otherwise. |
42 | */ |
42 | */ |
43 | void *as_area_create(void *address, size_t size, int flags) |
43 | void *as_area_create(void *address, size_t size, int flags) |
44 | { |
44 | { |
45 | return (void *) __SYSCALL3(SYS_AS_AREA_CREATE, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags); |
45 | return (void *) __SYSCALL3(SYS_AS_AREA_CREATE, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags); |
46 | } |
46 | } |
47 | 47 | ||
48 | /** Resize address space area. |
48 | /** Resize address space area. |
49 | * |
49 | * |
50 | * @param address Virtual address pointing into already existing address space area. |
50 | * @param address Virtual address pointing into already existing address space area. |
51 | * @param size New requested size of the area. |
51 | * @param size New requested size of the area. |
52 | * @param flags Currently unused. |
52 | * @param flags Currently unused. |
53 | * |
53 | * |
54 | * @return address on success, (void *) -1 otherwise. |
54 | * @return Zero on success or a code from @ref errno.h on failure. |
55 | */ |
55 | */ |
56 | void *as_area_resize(void *address, size_t size, int flags) |
56 | int as_area_resize(void *address, size_t size, int flags) |
57 | { |
57 | { |
58 | return (void *) __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags); |
58 | return __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags); |
- | 59 | } |
|
- | 60 | ||
- | 61 | /** Destroy address space area. |
|
- | 62 | * |
|
- | 63 | * @param address Virtual address pointing into the address space area being destroyed. |
|
- | 64 | * |
|
- | 65 | * @return Zero on success or a code from @ref errno.h on failure. |
|
- | 66 | */ |
|
- | 67 | int as_area_destroy(void *address) |
|
- | 68 | { |
|
- | 69 | return __SYSCALL1(SYS_AS_AREA_DESTROY, (sysarg_t ) address); |
|
59 | } |
70 | } |
60 | 71 | ||
61 | /** Prepare to accept address space area. |
72 | /** Prepare to accept address space area. |
62 | * |
73 | * |
63 | * @param id Task ID of the donor task. |
74 | * @param id Task ID of the donor task. |
64 | * @param base Destination address for the new address space area. |
75 | * @param base Destination address for the new address space area. |
65 | * @param size Size of the new address space area. |
76 | * @param size Size of the new address space area. |
66 | * @param flags Flags of the area TASK is willing to accept. |
77 | * @param flags Flags of the area TASK is willing to accept. |
67 | * |
78 | * |
68 | * @return 0 on success or a code from errno.h. |
79 | * @return 0 on success or a code from errno.h. |
69 | */ |
80 | */ |
70 | int as_area_accept(task_id_t id, void *base, size_t size, int flags) |
81 | int as_area_accept(task_id_t id, void *base, size_t size, int flags) |
71 | { |
82 | { |
72 | as_area_acptsnd_arg_t arg; |
83 | as_area_acptsnd_arg_t arg; |
73 | 84 | ||
74 | arg.task_id = id; |
85 | arg.task_id = id; |
75 | arg.base = base; |
86 | arg.base = base; |
76 | arg.size = size; |
87 | arg.size = size; |
77 | arg.flags = flags; |
88 | arg.flags = flags; |
78 | 89 | ||
79 | return __SYSCALL1(SYS_AS_AREA_ACCEPT, (sysarg_t) &arg); |
90 | return __SYSCALL1(SYS_AS_AREA_ACCEPT, (sysarg_t) &arg); |
80 | } |
91 | } |
81 | 92 | ||
82 | /** Send address space area to another task. |
93 | /** Send address space area to another task. |
83 | * |
94 | * |
84 | * @param id Task ID of the acceptor task. |
95 | * @param id Task ID of the acceptor task. |
85 | * @param base Source address of the existing address space area. |
96 | * @param base Source address of the existing address space area. |
86 | * |
97 | * |
87 | * @return 0 on success or a code from errno.h. |
98 | * @return 0 on success or a code from errno.h. |
88 | */ |
99 | */ |
89 | int as_area_send(task_id_t id, void *base) |
100 | int as_area_send(task_id_t id, void *base) |
90 | { |
101 | { |
91 | as_area_acptsnd_arg_t arg; |
102 | as_area_acptsnd_arg_t arg; |
92 | 103 | ||
93 | arg.task_id = id; |
104 | arg.task_id = id; |
94 | arg.base = base; |
105 | arg.base = base; |
95 | arg.size = 0; |
106 | arg.size = 0; |
96 | arg.flags = 0; |
107 | arg.flags = 0; |
97 | 108 | ||
98 | return __SYSCALL1(SYS_AS_AREA_SEND, (sysarg_t) &arg); |
109 | return __SYSCALL1(SYS_AS_AREA_SEND, (sysarg_t) &arg); |
99 | } |
110 | } |
100 | 111 | ||
101 | static size_t heapsize = 0; |
112 | static size_t heapsize = 0; |
102 | /* Start of heap linker symbol */ |
113 | /* Start of heap linker symbol */ |
103 | extern char _heap; |
114 | extern char _heap; |
104 | 115 | ||
105 | /** Sbrk emulation |
116 | /** Sbrk emulation |
106 | * |
117 | * |
107 | * @param size New area that should be allocated or negative, |
118 | * @param size New area that should be allocated or negative, |
108 | if it should be shrinked |
119 | if it should be shrinked |
109 | * @return Pointer to newly allocated area |
120 | * @return Pointer to newly allocated area |
110 | */ |
121 | */ |
111 | void *sbrk(ssize_t incr) |
122 | void *sbrk(ssize_t incr) |
112 | { |
123 | { |
- | 124 | int rc; |
|
113 | void *res; |
125 | void *res; |
114 | /* Check for invalid values */ |
126 | /* Check for invalid values */ |
115 | if (incr < 0 && -incr > heapsize) |
127 | if (incr < 0 && -incr > heapsize) |
116 | return NULL; |
128 | return NULL; |
117 | /* Check for too large value */ |
129 | /* Check for too large value */ |
118 | if (incr > 0 && incr+heapsize < heapsize) |
130 | if (incr > 0 && incr+heapsize < heapsize) |
119 | return NULL; |
131 | return NULL; |
120 | /* Check for too small values */ |
132 | /* Check for too small values */ |
121 | if (incr < 0 && incr+heapsize > heapsize) |
133 | if (incr < 0 && incr+heapsize > heapsize) |
122 | return NULL; |
134 | return NULL; |
123 | 135 | ||
124 | res = as_area_resize(&_heap, heapsize + incr,0); |
136 | rc = as_area_resize(&_heap, heapsize + incr,0); |
125 | if (!res) |
137 | if (rc != 0) |
126 | return NULL; |
138 | return NULL; |
127 | 139 | ||
128 | /* Compute start of new area */ |
140 | /* Compute start of new area */ |
129 | res = (void *)&_heap + heapsize; |
141 | res = (void *)&_heap + heapsize; |
130 | 142 | ||
131 | heapsize += incr; |
143 | heapsize += incr; |
132 | 144 | ||
133 | return res; |
145 | return res; |
134 | } |
146 | } |
135 | 147 |