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1999 decky 1
/*
2071 jermar 2
 * Copyright (c) 2006 Martin Decky
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 * 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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#include <lib/rd.h>
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#include <byteorder.h>
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#include <mm/frame.h>
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#include <sysinfo/sysinfo.h>
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#include <ddi/ddi.h>
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#include <align.h>
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static parea_t rd_parea;        /**< Physical memory area for rd. */
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/**
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 * RAM disk initialization routine. At this point, the RAM disk memory is shared
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 * and information about the share is provided as sysinfo values to the
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 * userspace tasks.
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 */  
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int init_rd(rd_header_t *header, size_t size)
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{
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    /* Identify RAM disk */
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    if ((header->magic[0] != RD_MAG0) || (header->magic[1] != RD_MAG1) ||
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        (header->magic[2] != RD_MAG2) || (header->magic[3] != RD_MAG3))
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        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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    uint32_t hsize;
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    uint64_t dsize;
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    switch (header->data_type) {
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    case RD_DATA_LSB:
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        hsize = uint32_t_le2host(header->header_size);
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        dsize = uint64_t_le2host(header->data_size);
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        break;
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    case RD_DATA_MSB:
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        hsize = uint32_t_be2host(header->header_size);
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        dsize = uint64_t_be2host(header->data_size);
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        break;
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    default:
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        return RE_UNSUPPORTED;
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    }
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    if ((hsize % FRAME_SIZE) || (dsize % FRAME_SIZE))
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        return RE_UNSUPPORTED;
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    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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    rd_parea.pbase = ALIGN_DOWN((uintptr_t) KA2PA((void *) header + hsize),
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        FRAME_SIZE);
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    rd_parea.vbase = (uintptr_t) ((void *) header + hsize);
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    rd_parea.frames = SIZE2FRAMES(dsize);
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    rd_parea.cacheable = true;
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    ddi_parea_register(&rd_parea);
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    sysinfo_set_item_val("rd", NULL, true);
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    sysinfo_set_item_val("rd.header_size", NULL, hsize);   
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    sysinfo_set_item_val("rd.size", NULL, dsize);
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    sysinfo_set_item_val("rd.address.physical", NULL,
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        (unative_t) KA2PA((void *) header + hsize));
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    return RE_OK;
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}
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/** @}
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 */