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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 | |||
| 1250 | jermar | 29 | #include <as.h> |
| 978 | jermar | 30 | #include <libc.h> |
| 31 | #include <unistd.h> |
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| 1237 | jermar | 32 | #include <task.h> |
| 978 | jermar | 33 | |
| 1228 | jermar | 34 | /** Create address space area. |
| 1033 | jermar | 35 | * |
| 36 | * @param address Virtual address where to place new address space area. |
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| 37 | * @param size Size of the area. |
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| 38 | * @param flags Flags describing type of the area. |
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| 39 | * |
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| 40 | * @return address on success, (void *) -1 otherwise. |
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| 41 | */ |
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| 1228 | jermar | 42 | void *as_area_create(void *address, size_t size, int flags) |
| 978 | jermar | 43 | { |
| 1228 | jermar | 44 | return (void *) __SYSCALL3(SYS_AS_AREA_CREATE, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags); |
| 1033 | jermar | 45 | } |
| 46 | |||
| 1228 | jermar | 47 | /** Resize address space area. |
| 1033 | jermar | 48 | * |
| 49 | * @param address Virtual address pointing into already existing address space area. |
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| 50 | * @param size New requested size of the area. |
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| 51 | * @param flags Currently unused. |
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| 52 | * |
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| 1307 | jermar | 53 | * @return Zero on success or a code from @ref errno.h on failure. |
| 1033 | jermar | 54 | */ |
| 1307 | jermar | 55 | int as_area_resize(void *address, size_t size, int flags) |
| 1033 | jermar | 56 | { |
| 1307 | jermar | 57 | return __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t ) address, (sysarg_t) size, (sysarg_t) flags); |
| 978 | jermar | 58 | } |
| 985 | palkovsky | 59 | |
| 1307 | jermar | 60 | /** Destroy address space area. |
| 61 | * |
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| 62 | * @param address Virtual address pointing into the address space area being destroyed. |
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| 63 | * |
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| 64 | * @return Zero on success or a code from @ref errno.h on failure. |
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| 65 | */ |
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| 66 | int as_area_destroy(void *address) |
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| 67 | { |
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| 68 | return __SYSCALL1(SYS_AS_AREA_DESTROY, (sysarg_t ) address); |
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| 69 | } |
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| 70 | |||
| 985 | palkovsky | 71 | static size_t heapsize = 0; |
| 72 | /* Start of heap linker symbol */ |
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| 73 | extern char _heap; |
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| 74 | |||
| 75 | /** Sbrk emulation |
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| 76 | * |
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| 77 | * @param size New area that should be allocated or negative, |
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| 78 | if it should be shrinked |
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| 79 | * @return Pointer to newly allocated area |
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| 80 | */ |
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| 81 | void *sbrk(ssize_t incr) |
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| 82 | { |
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| 1307 | jermar | 83 | int rc; |
| 985 | palkovsky | 84 | void *res; |
| 85 | /* Check for invalid values */ |
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| 86 | if (incr < 0 && -incr > heapsize) |
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| 87 | return NULL; |
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| 88 | /* Check for too large value */ |
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| 89 | if (incr > 0 && incr+heapsize < heapsize) |
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| 90 | return NULL; |
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| 91 | /* Check for too small values */ |
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| 92 | if (incr < 0 && incr+heapsize > heapsize) |
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| 93 | return NULL; |
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| 94 | |||
| 1307 | jermar | 95 | rc = as_area_resize(&_heap, heapsize + incr,0); |
| 96 | if (rc != 0) |
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| 985 | palkovsky | 97 | return NULL; |
| 999 | palkovsky | 98 | |
| 99 | /* Compute start of new area */ |
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| 100 | res = (void *)&_heap + heapsize; |
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| 101 | |||
| 985 | palkovsky | 102 | heapsize += incr; |
| 999 | palkovsky | 103 | |
| 985 | palkovsky | 104 | return res; |
| 105 | } |