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| Rev | Author | Line No. | Line |
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| 978 | jermar | 1 | /* |
| 2 | * Copyright (C) 2006 Jakub Jermar |
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| 3 | * All rights reserved. |
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| 4 | * |
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| 5 | * Redistribution and use in source and binary forms, with or without |
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| 6 | * modification, are permitted provided that the following conditions |
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| 7 | * are met: |
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| 8 | * |
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| 9 | * - Redistributions of source code must retain the above copyright |
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| 10 | * notice, this list of conditions and the following disclaimer. |
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| 11 | * - Redistributions in binary form must reproduce the above copyright |
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| 12 | * notice, this list of conditions and the following disclaimer in the |
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| 13 | * documentation and/or other materials provided with the distribution. |
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| 14 | * - The name of the author may not be used to endorse or promote products |
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| 15 | * derived from this software without specific prior written permission. |
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| 16 | * |
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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| 27 | */ |
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| 28 | |||
| 1501 | palkovsky | 29 | #include <stdlib.h> |
| 30 | #include <unistd.h> |
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| 31 | #include <string.h> |
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| 32 | #include <ddi.h> |
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| 33 | #include <sysinfo.h> |
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| 34 | #include <align.h> |
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| 1250 | jermar | 35 | #include <as.h> |
| 1501 | palkovsky | 36 | #include <ipc/fb.h> |
| 37 | #include <ipc/ipc.h> |
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| 38 | #include <ipc/ns.h> |
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| 39 | #include <ipc/services.h> |
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| 40 | #include <kernel/errno.h> |
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| 41 | |||
| 42 | |||
| 43 | #include <as.h> |
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| 978 | jermar | 44 | #include <libc.h> |
| 45 | #include <unistd.h> |
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| 1501 | palkovsky | 46 | #include <align.h> |
| 978 | jermar | 47 | |
| 1228 | jermar | 48 | /** Create address space area. |
| 1033 | jermar | 49 | * |
| 50 | * @param address Virtual address where to place new address space area. |
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| 51 | * @param size Size of the area. |
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| 52 | * @param flags Flags describing type of the area. |
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| 53 | * |
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| 54 | * @return address on success, (void *) -1 otherwise. |
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| 55 | */ |
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| 1228 | jermar | 56 | void *as_area_create(void *address, size_t size, int flags) |
| 978 | jermar | 57 | { |
| 1228 | jermar | 58 | return (void *) __SYSCALL3(SYS_AS_AREA_CREATE, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags); |
| 1033 | jermar | 59 | } |
| 60 | |||
| 1228 | jermar | 61 | /** Resize address space area. |
| 1033 | jermar | 62 | * |
| 63 | * @param address Virtual address pointing into already existing address space area. |
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| 64 | * @param size New requested size of the area. |
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| 65 | * @param flags Currently unused. |
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| 66 | * |
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| 1307 | jermar | 67 | * @return Zero on success or a code from @ref errno.h on failure. |
| 1033 | jermar | 68 | */ |
| 1307 | jermar | 69 | int as_area_resize(void *address, size_t size, int flags) |
| 1033 | jermar | 70 | { |
| 1307 | jermar | 71 | return __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags); |
| 978 | jermar | 72 | } |
| 985 | palkovsky | 73 | |
| 1307 | jermar | 74 | /** Destroy address space area. |
| 75 | * |
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| 76 | * @param address Virtual address pointing into the address space area being destroyed. |
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| 77 | * |
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| 78 | * @return Zero on success or a code from @ref errno.h on failure. |
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| 79 | */ |
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| 80 | int as_area_destroy(void *address) |
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| 81 | { |
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| 82 | return __SYSCALL1(SYS_AS_AREA_DESTROY, (sysarg_t ) address); |
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| 83 | } |
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| 84 | |||
| 985 | palkovsky | 85 | static size_t heapsize = 0; |
| 1363 | vana | 86 | static size_t maxheapsize = (size_t)(-1); |
| 1501 | palkovsky | 87 | |
| 88 | static void * last_allocated = 0; |
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| 89 | |||
| 985 | palkovsky | 90 | /* Start of heap linker symbol */ |
| 91 | extern char _heap; |
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| 92 | |||
| 93 | /** Sbrk emulation |
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| 94 | * |
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| 95 | * @param size New area that should be allocated or negative, |
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| 96 | if it should be shrinked |
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| 97 | * @return Pointer to newly allocated area |
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| 98 | */ |
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| 99 | void *sbrk(ssize_t incr) |
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| 100 | { |
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| 1307 | jermar | 101 | int rc; |
| 985 | palkovsky | 102 | void *res; |
| 103 | /* Check for invalid values */ |
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| 104 | if (incr < 0 && -incr > heapsize) |
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| 105 | return NULL; |
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| 106 | /* Check for too large value */ |
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| 107 | if (incr > 0 && incr+heapsize < heapsize) |
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| 108 | return NULL; |
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| 109 | /* Check for too small values */ |
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| 110 | if (incr < 0 && incr+heapsize > heapsize) |
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| 111 | return NULL; |
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| 1363 | vana | 112 | /* Check for user limit */ |
| 113 | if ((maxheapsize!=(size_t)(-1)) && (heapsize + incr)>maxheapsize) return NULL; |
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| 985 | palkovsky | 114 | |
| 1307 | jermar | 115 | rc = as_area_resize(&_heap, heapsize + incr,0); |
| 116 | if (rc != 0) |
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| 985 | palkovsky | 117 | return NULL; |
| 999 | palkovsky | 118 | |
| 119 | /* Compute start of new area */ |
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| 120 | res = (void *)&_heap + heapsize; |
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| 121 | |||
| 985 | palkovsky | 122 | heapsize += incr; |
| 999 | palkovsky | 123 | |
| 985 | palkovsky | 124 | return res; |
| 125 | } |
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| 1363 | vana | 126 | |
| 1501 | palkovsky | 127 | /** Set maximum heap size and return pointer just after the heap */ |
| 1363 | vana | 128 | void *set_maxheapsize(size_t mhs) |
| 129 | { |
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| 130 | maxheapsize=mhs; |
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| 131 | /* Return pointer to area not managed by sbrk */ |
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| 132 | return (void *)&_heap + maxheapsize; |
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| 133 | |||
| 134 | } |
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| 1501 | palkovsky | 135 | |
| 136 | /** Return pointer to some unmapped area, where fits new as_area |
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| 137 | * |
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| 138 | * TODO: make some first_fit/... algorithm, we are now just incrementing |
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| 139 | * the pointer to last area |
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| 140 | */ |
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| 141 | void * as_get_mappable_page(size_t sz) |
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| 142 | { |
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| 143 | void *res; |
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| 144 | |||
| 145 | /* Set heapsize to some meaningful value */ |
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| 146 | if (maxheapsize == -1) |
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| 147 | set_maxheapsize(ALIGN_UP(USER_ADDRESS_SPACE_SIZE_ARCH>>1,PAGE_SIZE)); |
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| 148 | if (!last_allocated) |
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| 149 | last_allocated = ALIGN_UP((void *)&_heap + maxheapsize, PAGE_SIZE); |
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| 150 | |||
| 151 | sz = ALIGN_UP(sz, PAGE_SIZE); |
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| 152 | res = last_allocated; |
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| 153 | last_allocated += sz; |
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| 154 | |||
| 155 | return res; |
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| 156 | } |