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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 | /** @addtogroup libc |
|
- | 30 | * @{ |
|
- | 31 | */ |
|
- | 32 | /** @file |
|
- | 33 | */ |
|
- | 34 | ||
29 | #include <as.h> |
35 | #include <as.h> |
30 | #include <libc.h> |
36 | #include <libc.h> |
31 | #include <unistd.h> |
37 | #include <unistd.h> |
32 | #include <align.h> |
38 | #include <align.h> |
33 | 39 | ||
34 | /** Create address space area. |
40 | /** Create address space area. |
35 | * |
41 | * |
36 | * @param address Virtual address where to place new address space area. |
42 | * @param address Virtual address where to place new address space area. |
37 | * @param size Size of the area. |
43 | * @param size Size of the area. |
38 | * @param flags Flags describing type of the area. |
44 | * @param flags Flags describing type of the area. |
39 | * |
45 | * |
40 | * @return address on success, (void *) -1 otherwise. |
46 | * @return address on success, (void *) -1 otherwise. |
41 | */ |
47 | */ |
42 | void *as_area_create(void *address, size_t size, int flags) |
48 | void *as_area_create(void *address, size_t size, int flags) |
43 | { |
49 | { |
44 | return (void *) __SYSCALL3(SYS_AS_AREA_CREATE, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags); |
50 | return (void *) __SYSCALL3(SYS_AS_AREA_CREATE, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags); |
45 | } |
51 | } |
46 | 52 | ||
47 | /** Resize address space area. |
53 | /** Resize address space area. |
48 | * |
54 | * |
49 | * @param address Virtual address pointing into already existing address space area. |
55 | * @param address Virtual address pointing into already existing address space area. |
50 | * @param size New requested size of the area. |
56 | * @param size New requested size of the area. |
51 | * @param flags Currently unused. |
57 | * @param flags Currently unused. |
52 | * |
58 | * |
53 | * @return Zero on success or a code from @ref errno.h on failure. |
59 | * @return Zero on success or a code from @ref errno.h on failure. |
54 | */ |
60 | */ |
55 | int as_area_resize(void *address, size_t size, int flags) |
61 | int as_area_resize(void *address, size_t size, int flags) |
56 | { |
62 | { |
57 | return __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags); |
63 | return __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags); |
58 | } |
64 | } |
59 | 65 | ||
60 | /** Destroy address space area. |
66 | /** Destroy address space area. |
61 | * |
67 | * |
62 | * @param address Virtual address pointing into the address space area being destroyed. |
68 | * @param address Virtual address pointing into the address space area being destroyed. |
63 | * |
69 | * |
64 | * @return Zero on success or a code from @ref errno.h on failure. |
70 | * @return Zero on success or a code from @ref errno.h on failure. |
65 | */ |
71 | */ |
66 | int as_area_destroy(void *address) |
72 | int as_area_destroy(void *address) |
67 | { |
73 | { |
68 | return __SYSCALL1(SYS_AS_AREA_DESTROY, (sysarg_t ) address); |
74 | return __SYSCALL1(SYS_AS_AREA_DESTROY, (sysarg_t ) address); |
69 | } |
75 | } |
70 | 76 | ||
71 | static size_t heapsize = 0; |
77 | static size_t heapsize = 0; |
72 | static size_t maxheapsize = (size_t)(-1); |
78 | static size_t maxheapsize = (size_t)(-1); |
73 | 79 | ||
74 | static void * last_allocated = 0; |
80 | static void * last_allocated = 0; |
75 | 81 | ||
76 | /* Start of heap linker symbol */ |
82 | /* Start of heap linker symbol */ |
77 | extern char _heap; |
83 | extern char _heap; |
78 | 84 | ||
79 | /** Sbrk emulation |
85 | /** Sbrk emulation |
80 | * |
86 | * |
81 | * @param size New area that should be allocated or negative, |
87 | * @param incr New area that should be allocated or negative, |
82 | if it should be shrinked |
88 | if it should be shrinked |
83 | * @return Pointer to newly allocated area |
89 | * @return Pointer to newly allocated area |
84 | */ |
90 | */ |
85 | void *sbrk(ssize_t incr) |
91 | void *sbrk(ssize_t incr) |
86 | { |
92 | { |
87 | int rc; |
93 | int rc; |
88 | void *res; |
94 | void *res; |
89 | /* Check for invalid values */ |
95 | /* Check for invalid values */ |
90 | if (incr < 0 && -incr > heapsize) |
96 | if (incr < 0 && -incr > heapsize) |
91 | return NULL; |
97 | return NULL; |
92 | /* Check for too large value */ |
98 | /* Check for too large value */ |
93 | if (incr > 0 && incr+heapsize < heapsize) |
99 | if (incr > 0 && incr+heapsize < heapsize) |
94 | return NULL; |
100 | return NULL; |
95 | /* Check for too small values */ |
101 | /* Check for too small values */ |
96 | if (incr < 0 && incr+heapsize > heapsize) |
102 | if (incr < 0 && incr+heapsize > heapsize) |
97 | return NULL; |
103 | return NULL; |
98 | /* Check for user limit */ |
104 | /* Check for user limit */ |
99 | if ((maxheapsize!=(size_t)(-1)) && (heapsize + incr)>maxheapsize) return NULL; |
105 | if ((maxheapsize!=(size_t)(-1)) && (heapsize + incr)>maxheapsize) return NULL; |
100 | 106 | ||
101 | rc = as_area_resize(&_heap, heapsize + incr,0); |
107 | rc = as_area_resize(&_heap, heapsize + incr,0); |
102 | if (rc != 0) |
108 | if (rc != 0) |
103 | return NULL; |
109 | return NULL; |
104 | 110 | ||
105 | /* Compute start of new area */ |
111 | /* Compute start of new area */ |
106 | res = (void *)&_heap + heapsize; |
112 | res = (void *)&_heap + heapsize; |
107 | 113 | ||
108 | heapsize += incr; |
114 | heapsize += incr; |
109 | 115 | ||
110 | return res; |
116 | return res; |
111 | } |
117 | } |
112 | 118 | ||
113 | /** Set maximum heap size and return pointer just after the heap */ |
119 | /** Set maximum heap size and return pointer just after the heap */ |
114 | void *set_maxheapsize(size_t mhs) |
120 | void *set_maxheapsize(size_t mhs) |
115 | { |
121 | { |
116 | maxheapsize=mhs; |
122 | maxheapsize=mhs; |
117 | /* Return pointer to area not managed by sbrk */ |
123 | /* Return pointer to area not managed by sbrk */ |
118 | return (void *)&_heap + maxheapsize; |
124 | return (void *)&_heap + maxheapsize; |
119 | 125 | ||
120 | } |
126 | } |
121 | 127 | ||
122 | /** Return pointer to some unmapped area, where fits new as_area |
128 | /** Return pointer to some unmapped area, where fits new as_area |
123 | * |
129 | * |
124 | * TODO: make some first_fit/... algorithm, we are now just incrementing |
130 | * TODO: make some first_fit/... algorithm, we are now just incrementing |
125 | * the pointer to last area |
131 | * the pointer to last area |
126 | */ |
132 | */ |
127 | void * as_get_mappable_page(size_t sz) |
133 | void * as_get_mappable_page(size_t sz) |
128 | { |
134 | { |
129 | void *res; |
135 | void *res; |
130 | 136 | ||
131 | /* Set heapsize to some meaningful value */ |
137 | /* Set heapsize to some meaningful value */ |
132 | if (maxheapsize == -1) |
138 | if (maxheapsize == -1) |
133 | set_maxheapsize(ALIGN_UP(USER_ADDRESS_SPACE_SIZE_ARCH>>1,PAGE_SIZE)); |
139 | set_maxheapsize(ALIGN_UP(USER_ADDRESS_SPACE_SIZE_ARCH>>1,PAGE_SIZE)); |
134 | if (!last_allocated) |
140 | if (!last_allocated) |
135 | last_allocated = ALIGN_UP((void *)&_heap + maxheapsize, PAGE_SIZE); |
141 | last_allocated = ALIGN_UP((void *)&_heap + maxheapsize, PAGE_SIZE); |
136 | 142 | ||
137 | sz = ALIGN_UP(sz, PAGE_SIZE); |
143 | sz = ALIGN_UP(sz, PAGE_SIZE); |
138 | res = last_allocated; |
144 | res = last_allocated; |
139 | last_allocated += sz; |
145 | last_allocated += sz; |
140 | 146 | ||
141 | return res; |
147 | return res; |
142 | } |
148 | } |
- | 149 | ||
- | 150 | ||
- | 151 | /** @} |
|
- | 152 | */ |
|
- | 153 | ||
- | 154 | ||
143 | 155 |