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