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