| 1 | /*
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| 2 | * Copyright (c) 2006 Martin Decky
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup genericmm
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| 30 | * @{
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| 31 | */
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| 32 |
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| 33 | /**
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| 34 | * @file
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| 35 | * @brief RAM disk support.
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| 36 | *
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| 37 | * Support for RAM disk images.
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| 38 | */
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| 39 |
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| 40 | #include <lib/rd.h>
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| 41 | #include <byteorder.h>
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| 42 | #include <mm/frame.h>
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| 43 | #include <sysinfo/sysinfo.h>
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| 44 | #include <ddi/ddi.h>
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| 45 | #include <align.h>
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| 46 |
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| 47 | static parea_t rd_parea; /**< Physical memory area for rd. */
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| 48 |
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| 49 | /**
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| 50 | * RAM disk initialization routine. At this point, the RAM disk memory is shared
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| 51 | * and information about the share is provided as sysinfo values to the
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| 52 | * userspace tasks.
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| 53 | */
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| 54 | int init_rd(rd_header_t *header, size_t size)
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| 55 | {
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| 56 | /* Identify RAM disk */
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| 57 | if ((header->magic[0] != RD_MAG0) || (header->magic[1] != RD_MAG1) ||
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| 58 | (header->magic[2] != RD_MAG2) || (header->magic[3] != RD_MAG3))
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| 59 | return RE_INVALID;
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| 60 |
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| 61 | /* Identify version */
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| 62 | if (header->version != RD_VERSION)
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| 63 | return RE_UNSUPPORTED;
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| 64 |
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| 65 | uint32_t hsize;
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| 66 | uint64_t dsize;
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| 67 | switch (header->data_type) {
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| 68 | case RD_DATA_LSB:
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| 69 | hsize = uint32_t_le2host(header->header_size);
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| 70 | dsize = uint64_t_le2host(header->data_size);
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| 71 | break;
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| 72 | case RD_DATA_MSB:
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| 73 | hsize = uint32_t_be2host(header->header_size);
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| 74 | dsize = uint64_t_be2host(header->data_size);
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| 75 | break;
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| 76 | default:
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| 77 | return RE_UNSUPPORTED;
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| 78 | }
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| 79 |
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| 80 | if ((hsize % FRAME_SIZE) || (dsize % FRAME_SIZE))
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| 81 | return RE_UNSUPPORTED;
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| 82 |
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| 83 | if (hsize > size)
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| 84 | return RE_INVALID;
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| 85 |
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| 86 | if ((uint64_t) hsize + dsize > size)
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| 87 | dsize = size - hsize;
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| 88 |
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| 89 | rd_parea.pbase = ALIGN_DOWN((uintptr_t) KA2PA((void *) header + hsize),
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| 90 | FRAME_SIZE);
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| 91 | rd_parea.frames = SIZE2FRAMES(dsize);
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| 92 | rd_parea.unpriv = false;
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| 93 | ddi_parea_register(&rd_parea);
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| 94 |
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| 95 | sysinfo_set_item_val("rd", NULL, true);
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| 96 | sysinfo_set_item_val("rd.header_size", NULL, hsize);
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| 97 | sysinfo_set_item_val("rd.size", NULL, dsize);
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| 98 | sysinfo_set_item_val("rd.address.physical", NULL,
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| 99 | (sysarg_t) KA2PA((void *) header + hsize));
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| 100 |
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| 101 | return RE_OK;
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| 102 | }
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| 103 |
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| 104 | /** @}
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| 105 | */
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