Subversion Repositories HelenOS

Rev

Rev 2131 | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
1999 decky 1
/*
2071 jermar 2
 * Copyright (c) 2006 Martin Decky
1999 decky 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.
27
 */
28
 
29
/** @addtogroup genericmm
30
 * @{
31
 */
32
 
33
/**
34
 * @file
35
 * @brief   RAM disk support.
36
 *
37
 * Support for RAM disk images.
38
 */
39
 
2000 decky 40
#include <lib/rd.h>
2002 decky 41
#include <arch/byteorder.h>
2005 decky 42
#include <mm/frame.h>
43
#include <sysinfo/sysinfo.h>
2015 jermar 44
#include <ddi/ddi.h>
1999 decky 45
 
2015 jermar 46
static parea_t rd_parea;        /**< Physical memory area for rd. */
47
 
2005 decky 48
int init_rd(rd_header * header, size_t size)
1999 decky 49
{
2002 decky 50
    /* Identify RAM disk */
2015 jermar 51
    if ((header->magic[0] != RD_MAG0) || (header->magic[1] != RD_MAG1) ||
52
        (header->magic[2] != RD_MAG2) || (header->magic[3] != RD_MAG3))
2002 decky 53
        return RE_INVALID;
54
 
55
    /* Identify version */ 
56
    if (header->version != RD_VERSION)
57
        return RE_UNSUPPORTED;
58
 
2005 decky 59
    uint32_t hsize;
60
    uint64_t dsize;
2002 decky 61
    switch (header->data_type) {
62
    case RD_DATA_LSB:
2005 decky 63
        hsize = uint32_t_le2host(header->header_size);
64
        dsize = uint64_t_le2host(header->data_size);
2002 decky 65
        break;
2005 decky 66
    case RD_DATA_MSB:
67
        hsize = uint32_t_be2host(header->header_size);
2063 jermar 68
        dsize = uint64_t_be2host(header->data_size);
2005 decky 69
        break;
2002 decky 70
    default:
71
        return RE_UNSUPPORTED;
72
    }
2005 decky 73
 
74
    if ((hsize % FRAME_SIZE) || (dsize % FRAME_SIZE))
75
        return RE_UNSUPPORTED;
76
 
77
    if (hsize > size)
78
        return RE_INVALID;
79
 
80
    if ((uint64_t) hsize + dsize > size)
81
        dsize = size - hsize;
82
 
2015 jermar 83
    rd_parea.pbase = KA2PA((void *) header + hsize);
84
    rd_parea.vbase = (uintptr_t) ((void *) header + hsize);
85
    rd_parea.frames = SIZE2FRAMES(dsize);
86
    rd_parea.cacheable = true;
87
    ddi_parea_register(&rd_parea);
88
 
2005 decky 89
    sysinfo_set_item_val("rd", NULL, true);
90
    sysinfo_set_item_val("rd.size", NULL, dsize);
2015 jermar 91
    sysinfo_set_item_val("rd.address.physical", NULL, (unative_t)
92
        KA2PA((void *) header + hsize));
2002 decky 93
 
94
    return RE_OK;
1999 decky 95
}
96
 
97
/** @}
98
 */