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1999 decky 1
/*
2071 jermar 2
 * Copyright (c) 2006 Martin Decky
1999 decky 3
 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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/** @addtogroup genericmm
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 * @{
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 */
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/**
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 * @file
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 * @brief   RAM disk support.
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 *
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 * Support for RAM disk images.
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 */
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2000 decky 40
#include <lib/rd.h>
2797 jermar 41
#include <byteorder.h>
2005 decky 42
#include <mm/frame.h>
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#include <sysinfo/sysinfo.h>
2015 jermar 44
#include <ddi/ddi.h>
2445 decky 45
#include <align.h>
1999 decky 46
 
2015 jermar 47
static parea_t rd_parea;        /**< Physical memory area for rd. */
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2445 decky 49
/**
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 * RAM disk initialization routine. At this point, the RAM disk memory is shared
3246 jermar 51
 * and information about the share is provided as sysinfo values to the
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 * userspace tasks.
2445 decky 53
 */  
3029 decky 54
int init_rd(rd_header_t *header, size_t size)
1999 decky 55
{
2002 decky 56
    /* Identify RAM disk */
2015 jermar 57
    if ((header->magic[0] != RD_MAG0) || (header->magic[1] != RD_MAG1) ||
3246 jermar 58
        (header->magic[2] != RD_MAG2) || (header->magic[3] != RD_MAG3))
2002 decky 59
        return RE_INVALID;
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    /* Identify version */ 
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    if (header->version != RD_VERSION)
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        return RE_UNSUPPORTED;
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2005 decky 65
    uint32_t hsize;
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    uint64_t dsize;
2002 decky 67
    switch (header->data_type) {
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    case RD_DATA_LSB:
2005 decky 69
        hsize = uint32_t_le2host(header->header_size);
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        dsize = uint64_t_le2host(header->data_size);
2002 decky 71
        break;
2005 decky 72
    case RD_DATA_MSB:
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        hsize = uint32_t_be2host(header->header_size);
2063 jermar 74
        dsize = uint64_t_be2host(header->data_size);
2005 decky 75
        break;
2002 decky 76
    default:
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        return RE_UNSUPPORTED;
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    }
2005 decky 79
 
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    if ((hsize % FRAME_SIZE) || (dsize % FRAME_SIZE))
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        return RE_UNSUPPORTED;
3029 decky 82
 
2005 decky 83
    if (hsize > size)
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        return RE_INVALID;
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    if ((uint64_t) hsize + dsize > size)
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        dsize = size - hsize;
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3246 jermar 89
    rd_parea.pbase = ALIGN_DOWN((uintptr_t) KA2PA((void *) header + hsize),
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        FRAME_SIZE);
2015 jermar 91
    rd_parea.frames = SIZE2FRAMES(dsize);
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    ddi_parea_register(&rd_parea);
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2005 decky 94
    sysinfo_set_item_val("rd", NULL, true);
2445 decky 95
    sysinfo_set_item_val("rd.header_size", NULL, hsize);   
2005 decky 96
    sysinfo_set_item_val("rd.size", NULL, dsize);
3246 jermar 97
    sysinfo_set_item_val("rd.address.physical", NULL,
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        (unative_t) KA2PA((void *) header + hsize));
2002 decky 99
 
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    return RE_OK;
1999 decky 101
}
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/** @}
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 */