[79522a7] | 1 | /*
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[df4ed85] | 2 | * Copyright (c) 2006 Jakub Jermar
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[79522a7] | 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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[b2951e2] | 27 | */
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| 28 |
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[a46da63] | 29 | /** @addtogroup libc
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[b2951e2] | 30 | * @{
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| 31 | */
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| 32 | /** @file
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[e1ab30f8] | 33 | */
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[79522a7] | 34 |
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[5a4c754] | 35 | #include <as.h>
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[79522a7] | 36 | #include <libc.h>
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| 37 | #include <unistd.h>
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[bf9afa07] | 38 | #include <align.h>
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[5d4e90f0] | 39 | #include <sys/types.h>
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[f8ddd17] | 40 | #include <bitops.h>
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[db24058] | 41 | #include <malloc.h>
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[d681c17] | 42 |
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[db24058] | 43 | /** Last position allocated by as_get_mappable_page */
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| 44 | static uintptr_t last_allocated = 0;
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[79522a7] | 45 |
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[d3b8c1f] | 46 | /** Create address space area.
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[585819d] | 47 | *
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| 48 | * @param address Virtual address where to place new address space area.
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[db24058] | 49 | * @param size Size of the area.
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| 50 | * @param flags Flags describing type of the area.
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[585819d] | 51 | *
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| 52 | * @return address on success, (void *) -1 otherwise.
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[db24058] | 53 | *
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[585819d] | 54 | */
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[d3b8c1f] | 55 | void *as_area_create(void *address, size_t size, int flags)
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[79522a7] | 56 | {
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[db24058] | 57 | return (void *) __SYSCALL3(SYS_AS_AREA_CREATE, (sysarg_t) address,
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[2057572] | 58 | (sysarg_t) size, (sysarg_t) flags);
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[79522a7] | 59 | }
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[7ad3c2f] | 60 |
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[d3b8c1f] | 61 | /** Resize address space area.
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[585819d] | 62 | *
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[f8ddd17] | 63 | * @param address Virtual address pointing into already existing address space
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[db24058] | 64 | * area.
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| 65 | * @param size New requested size of the area.
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| 66 | * @param flags Currently unused.
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| 67 | *
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| 68 | * @return zero on success or a code from @ref errno.h on failure.
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[585819d] | 69 | *
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[46ec2c06] | 70 | */
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| 71 | int as_area_resize(void *address, size_t size, int flags)
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| 72 | {
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[db24058] | 73 | return __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t) address,
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[2057572] | 74 | (sysarg_t) size, (sysarg_t) flags);
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[46ec2c06] | 75 | }
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| 76 |
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| 77 | /** Destroy address space area.
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| 78 | *
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[f8ddd17] | 79 | * @param address Virtual address pointing into the address space area being
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[db24058] | 80 | * destroyed.
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| 81 | *
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| 82 | * @return zero on success or a code from @ref errno.h on failure.
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[46ec2c06] | 83 | *
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[585819d] | 84 | */
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[46ec2c06] | 85 | int as_area_destroy(void *address)
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[585819d] | 86 | {
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[db24058] | 87 | return __SYSCALL1(SYS_AS_AREA_DESTROY, (sysarg_t) address);
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[585819d] | 88 | }
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[7ad3c2f] | 89 |
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[c98e6ee] | 90 | /** Change address-space area flags.
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| 91 | *
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| 92 | * @param address Virtual address pointing into the address space area being
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[db24058] | 93 | * modified.
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| 94 | * @param flags New flags describing type of the area.
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| 95 | *
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| 96 | * @return zero on success or a code from @ref errno.h on failure.
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[c98e6ee] | 97 | *
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| 98 | */
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| 99 | int as_area_change_flags(void *address, int flags)
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| 100 | {
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| 101 | return __SYSCALL2(SYS_AS_AREA_CHANGE_FLAGS, (sysarg_t) address,
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| 102 | (sysarg_t) flags);
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| 103 | }
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| 104 |
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[bf9afa07] | 105 | /** Return pointer to some unmapped area, where fits new as_area
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[f8ddd17] | 106 | *
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[db24058] | 107 | * @param size Requested size of the allocation.
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[f8ddd17] | 108 | *
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[db24058] | 109 | * @return pointer to the beginning
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[bf9afa07] | 110 | *
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| 111 | */
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[db24058] | 112 | void *as_get_mappable_page(size_t size)
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[bf9afa07] | 113 | {
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[db24058] | 114 | if (size == 0)
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| 115 | return NULL;
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[f8ddd17] | 116 |
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[db24058] | 117 | size_t sz = 1 << (fnzb(size - 1) + 1);
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| 118 | if (last_allocated == 0)
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| 119 | last_allocated = get_max_heap_addr();
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[a46da63] | 120 |
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[f8ddd17] | 121 | /*
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[2057572] | 122 | * Make sure we allocate from naturally aligned address.
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[f8ddd17] | 123 | */
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[db24058] | 124 | uintptr_t res = ALIGN_UP(last_allocated, sz);
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| 125 | last_allocated = res + ALIGN_UP(size, PAGE_SIZE);
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| 126 |
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| 127 | return ((void *) res);
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[bf9afa07] | 128 | }
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[b2951e2] | 129 |
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[a46da63] | 130 | /** @}
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[b2951e2] | 131 | */
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