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* Copyright (c) 2006 Martin Decky
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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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* - 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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* 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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/** @addtogroup genericmm
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* @brief RAM disk support.
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* Support for RAM disk images.
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#include <byteorder.h>
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#include <sysinfo/sysinfo.h>
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static parea_t rd_parea; /**< Physical memory area for rd. */
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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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int init_rd(rd_header_t *header, size_t size)
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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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/* Identify version */
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if (header->version != RD_VERSION)
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return RE_UNSUPPORTED;
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switch (header->data_type) {
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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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hsize = uint32_t_be2host(header->header_size);
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dsize = uint64_t_be2host(header->data_size);
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return RE_UNSUPPORTED;
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if ((hsize % FRAME_SIZE) || (dsize % FRAME_SIZE))
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return RE_UNSUPPORTED;
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if ((uint64_t) hsize + dsize > size)
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rd_parea.pbase = ALIGN_DOWN((uintptr_t) KA2PA((void *) header + hsize),
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rd_parea.frames = SIZE2FRAMES(dsize);
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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));