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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 Zero on success or a code from @ref errno.h on failure. |
54 | * @return Zero on success or a code from @ref errno.h on failure. |
| 55 | */ |
55 | */ |
| 56 | int 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 __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 | } |
59 | } |
| 60 | 60 | ||
| 61 | /** Destroy address space area. |
61 | /** Destroy address space area. |
| 62 | * |
62 | * |
| 63 | * @param address Virtual address pointing into the address space area being destroyed. |
63 | * @param address Virtual address pointing into the address space area being destroyed. |
| 64 | * |
64 | * |
| 65 | * @return Zero on success or a code from @ref errno.h on failure. |
65 | * @return Zero on success or a code from @ref errno.h on failure. |
| 66 | */ |
66 | */ |
| 67 | int as_area_destroy(void *address) |
67 | int as_area_destroy(void *address) |
| 68 | { |
68 | { |
| 69 | return __SYSCALL1(SYS_AS_AREA_DESTROY, (sysarg_t ) address); |
69 | return __SYSCALL1(SYS_AS_AREA_DESTROY, (sysarg_t ) address); |
| 70 | } |
70 | } |
| 71 | 71 | ||
| 72 | /** Prepare to accept address space area. |
- | |
| 73 | * |
- | |
| 74 | * @param id Task ID of the donor task. |
- | |
| 75 | * @param base Destination address for the new address space area. |
- | |
| 76 | * @param size Size of the new address space area. |
- | |
| 77 | * @param flags Flags of the area TASK is willing to accept. |
- | |
| 78 | * |
- | |
| 79 | * @return 0 on success or a code from errno.h. |
- | |
| 80 | */ |
- | |
| 81 | int as_area_accept(task_id_t id, void *base, size_t size, int flags) |
- | |
| 82 | { |
- | |
| 83 | as_area_acptsnd_arg_t arg; |
- | |
| 84 | - | ||
| 85 | arg.task_id = id; |
- | |
| 86 | arg.base = base; |
- | |
| 87 | arg.size = size; |
- | |
| 88 | arg.flags = flags; |
- | |
| 89 | - | ||
| 90 | return __SYSCALL1(SYS_AS_AREA_ACCEPT, (sysarg_t) &arg); |
- | |
| 91 | } |
- | |
| 92 | - | ||
| 93 | /** Send address space area to another task. |
- | |
| 94 | * |
- | |
| 95 | * @param id Task ID of the acceptor task. |
- | |
| 96 | * @param base Source address of the existing address space area. |
- | |
| 97 | * |
- | |
| 98 | * @return 0 on success or a code from errno.h. |
- | |
| 99 | */ |
- | |
| 100 | int as_area_send(task_id_t id, void *base) |
- | |
| 101 | { |
- | |
| 102 | as_area_acptsnd_arg_t arg; |
- | |
| 103 | - | ||
| 104 | arg.task_id = id; |
- | |
| 105 | arg.base = base; |
- | |
| 106 | arg.size = 0; |
- | |
| 107 | arg.flags = 0; |
- | |
| 108 | - | ||
| 109 | return __SYSCALL1(SYS_AS_AREA_SEND, (sysarg_t) &arg); |
- | |
| 110 | } |
- | |
| 111 | - | ||
| 112 | static size_t heapsize = 0; |
72 | static size_t heapsize = 0; |
| 113 | /* Start of heap linker symbol */ |
73 | /* Start of heap linker symbol */ |
| 114 | extern char _heap; |
74 | extern char _heap; |
| 115 | 75 | ||
| 116 | /** Sbrk emulation |
76 | /** Sbrk emulation |
| 117 | * |
77 | * |
| 118 | * @param size New area that should be allocated or negative, |
78 | * @param size New area that should be allocated or negative, |
| 119 | if it should be shrinked |
79 | if it should be shrinked |
| 120 | * @return Pointer to newly allocated area |
80 | * @return Pointer to newly allocated area |
| 121 | */ |
81 | */ |
| 122 | void *sbrk(ssize_t incr) |
82 | void *sbrk(ssize_t incr) |
| 123 | { |
83 | { |
| 124 | int rc; |
84 | int rc; |
| 125 | void *res; |
85 | void *res; |
| 126 | /* Check for invalid values */ |
86 | /* Check for invalid values */ |
| 127 | if (incr < 0 && -incr > heapsize) |
87 | if (incr < 0 && -incr > heapsize) |
| 128 | return NULL; |
88 | return NULL; |
| 129 | /* Check for too large value */ |
89 | /* Check for too large value */ |
| 130 | if (incr > 0 && incr+heapsize < heapsize) |
90 | if (incr > 0 && incr+heapsize < heapsize) |
| 131 | return NULL; |
91 | return NULL; |
| 132 | /* Check for too small values */ |
92 | /* Check for too small values */ |
| 133 | if (incr < 0 && incr+heapsize > heapsize) |
93 | if (incr < 0 && incr+heapsize > heapsize) |
| 134 | return NULL; |
94 | return NULL; |
| 135 | 95 | ||
| 136 | rc = as_area_resize(&_heap, heapsize + incr,0); |
96 | rc = as_area_resize(&_heap, heapsize + incr,0); |
| 137 | if (rc != 0) |
97 | if (rc != 0) |
| 138 | return NULL; |
98 | return NULL; |
| 139 | 99 | ||
| 140 | /* Compute start of new area */ |
100 | /* Compute start of new area */ |
| 141 | res = (void *)&_heap + heapsize; |
101 | res = (void *)&_heap + heapsize; |
| 142 | 102 | ||
| 143 | heapsize += incr; |
103 | heapsize += incr; |
| 144 | 104 | ||
| 145 | return res; |
105 | return res; |
| 146 | } |
106 | } |
| 147 | 107 | ||