Subversion Repositories HelenOS

Rev

Rev 3425 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
978 jermar 1 
/*
2071 jermar 2 
 * Copyright (c) 2006 Jakub Jermar
978 jermar 3 
 * All rights reserved.
4 
 *
5 
 * Redistribution and use in source and binary forms, with or without
6 
 * modification, are permitted provided that the following conditions
7 
 * are met:
8 
 *
9 
 * - Redistributions of source code must retain the above copyright
10 
 *   notice, this list of conditions and the following disclaimer.
11 
 * - Redistributions in binary form must reproduce the above copyright
12 
 *   notice, this list of conditions and the following disclaimer in the
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
15 
 *   derived from this software without specific prior written permission.
16 
 *
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
19 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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
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
26 
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1653 cejka 27 
 */
28 
 
1719 decky 29 
/** @addtogroup libc
1653 cejka 30 
 * @{
31 
 */
32 
/** @file
4692 svoboda 33 
 */
978 jermar 34 
 
1250 jermar 35 
#include <as.h>
978 jermar 36 
#include <libc.h>
37 
#include <unistd.h>
1501 palkovsky 38 
#include <align.h>
2541 jermar 39 
#include <sys/types.h>
2015 jermar 40 
#include <bitops.h>
4692 svoboda 41 
#include <malloc.h>
978 jermar 42 
 
4692 svoboda 43 
/** Last position allocated by as_get_mappable_page */
44 
static uintptr_t last_allocated = 0;
1868 jermar 45 
 
1228 jermar 46 
/** Create address space area.
1033 jermar 47 
 *
48 
 * @param address Virtual address where to place new address space area.
4692 svoboda 49 
 * @param size    Size of the area.
50 
 * @param flags   Flags describing type of the area.
1033 jermar 51 
 *
52 
 * @return address on success, (void *) -1 otherwise.
4692 svoboda 53 
 *
1033 jermar 54 
 */
1228 jermar 55 
void *as_area_create(void *address, size_t size, int flags)
978 jermar 56 
{
4692 svoboda 57 
    return (void *) __SYSCALL3(SYS_AS_AREA_CREATE, (sysarg_t) address,
2141 jermar 58 
        (sysarg_t) size, (sysarg_t) flags);
1033 jermar 59 
}
60 
 
1228 jermar 61 
/** Resize address space area.
1033 jermar 62 
 *
2015 jermar 63 
 * @param address Virtual address pointing into already existing address space
4692 svoboda 64 
 *                area.
65 
 * @param size    New requested size of the area.
66 
 * @param flags   Currently unused.
1033 jermar 67 
 *
4692 svoboda 68 
 * @return zero on success or a code from @ref errno.h on failure.
69 
 *
1033 jermar 70 
 */
1307 jermar 71 
int as_area_resize(void *address, size_t size, int flags)
1033 jermar 72 
{
4692 svoboda 73 
    return __SYSCALL3(SYS_AS_AREA_RESIZE, (sysarg_t) address,
2141 jermar 74 
        (sysarg_t) size, (sysarg_t) flags);
978 jermar 75 
}
985 palkovsky 76 
 
1307 jermar 77 
/** Destroy address space area.
78 
 *
2015 jermar 79 
 * @param address Virtual address pointing into the address space area being
4692 svoboda 80 
 *                destroyed.
1307 jermar 81 
 *
4692 svoboda 82 
 * @return zero on success or a code from @ref errno.h on failure.
83 
 *
1307 jermar 84 
 */
85 
int as_area_destroy(void *address)
86 
{
4692 svoboda 87 
    return __SYSCALL1(SYS_AS_AREA_DESTROY, (sysarg_t) address);
1307 jermar 88 
}
89 
 
3425 svoboda 90 
/** Change address-space area flags.
91 
 *
92 
 * @param address Virtual address pointing into the address space area being
4692 svoboda 93 
 *                modified.
94 
 * @param flags   New flags describing type of the area.
3425 svoboda 95 
 *
4692 svoboda 96 
 * @return zero on success or a code from @ref errno.h on failure.
97 
 *
3425 svoboda 98 
 */
99 
int as_area_change_flags(void *address, int flags)
100 
{
101 
    return __SYSCALL2(SYS_AS_AREA_CHANGE_FLAGS, (sysarg_t) address,
102 
        (sysarg_t) flags);
103 
}
104 
 
1501 palkovsky 105 
/** Return pointer to some unmapped area, where fits new as_area
106 
 *
4692 svoboda 107 
 * @param size Requested size of the allocation.
2015 jermar 108 
 *
4692 svoboda 109 
 * @return pointer to the beginning
2015 jermar 110 
 *
1501 palkovsky 111 
 */
4692 svoboda 112 
void *as_get_mappable_page(size_t size)
1501 palkovsky 113 
{
4692 svoboda 114 
    if (size == 0)
115 
        return NULL;
2015 jermar 116 
 
4692 svoboda 117 
    size_t sz = 1 << (fnzb(size - 1) + 1);
118 
    if (last_allocated == 0)
119 
        last_allocated = get_max_heap_addr();
1719 decky 120 
 
2015 jermar 121 
    /*
2141 jermar 122 
     * Make sure we allocate from naturally aligned address.
2015 jermar 123 
     */
4692 svoboda 124 
    uintptr_t res = ALIGN_UP(last_allocated, sz);
125 
    last_allocated = res + ALIGN_UP(size, PAGE_SIZE);
126 
 
127 
    return ((void *) res);
1501 palkovsky 128 
}
1653 cejka 129 
 
1719 decky 130 
/** @}
1653 cejka 131 
 */