| 1 | /*
|
|---|
| 2 | * Copyright (c) 2006 Martin 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 |
|
|---|
| 40 | #include <lib/rd.h>
|
|---|
| 41 | #include <byteorder.h>
|
|---|
| 42 | #include <mm/frame.h>
|
|---|
| 43 | #include <sysinfo/sysinfo.h>
|
|---|
| 44 | #include <ddi/ddi.h>
|
|---|
| 45 | #include <align.h>
|
|---|
| 46 |
|
|---|
| 47 | static parea_t rd_parea; /**< Physical memory area for rd. */
|
|---|
| 48 |
|
|---|
| 49 | /**
|
|---|
| 50 | * RAM disk initialization routine. At this point, the RAM disk memory is shared
|
|---|
| 51 | * and information about the share is provided as sysinfo values to the
|
|---|
| 52 | * userspace tasks.
|
|---|
| 53 | */
|
|---|
| 54 | int init_rd(rd_header_t *header, size_t size)
|
|---|
| 55 | {
|
|---|
| 56 | /* Identify RAM disk */
|
|---|
| 57 | if ((header->magic[0] != RD_MAG0) || (header->magic[1] != RD_MAG1) ||
|
|---|
| 58 | (header->magic[2] != RD_MAG2) || (header->magic[3] != RD_MAG3))
|
|---|
| 59 | return RE_INVALID;
|
|---|
| 60 |
|
|---|
| 61 | /* Identify version */
|
|---|
| 62 | if (header->version != RD_VERSION)
|
|---|
| 63 | return RE_UNSUPPORTED;
|
|---|
| 64 |
|
|---|
| 65 | uint32_t hsize;
|
|---|
| 66 | uint64_t dsize;
|
|---|
| 67 | switch (header->data_type) {
|
|---|
| 68 | case RD_DATA_LSB:
|
|---|
| 69 | hsize = uint32_t_le2host(header->header_size);
|
|---|
| 70 | dsize = uint64_t_le2host(header->data_size);
|
|---|
| 71 | break;
|
|---|
| 72 | case RD_DATA_MSB:
|
|---|
| 73 | hsize = uint32_t_be2host(header->header_size);
|
|---|
| 74 | dsize = uint64_t_be2host(header->data_size);
|
|---|
| 75 | break;
|
|---|
| 76 | default:
|
|---|
| 77 | return RE_UNSUPPORTED;
|
|---|
| 78 | }
|
|---|
| 79 |
|
|---|
| 80 | if ((hsize % FRAME_SIZE) || (dsize % FRAME_SIZE))
|
|---|
| 81 | return RE_UNSUPPORTED;
|
|---|
| 82 |
|
|---|
| 83 | if (hsize > size)
|
|---|
| 84 | return RE_INVALID;
|
|---|
| 85 |
|
|---|
| 86 | if ((uint64_t) hsize + dsize > size)
|
|---|
| 87 | dsize = size - hsize;
|
|---|
| 88 |
|
|---|
| 89 | rd_parea.pbase = ALIGN_DOWN((uintptr_t) KA2PA((void *) header + hsize),
|
|---|
| 90 | FRAME_SIZE);
|
|---|
| 91 | rd_parea.frames = SIZE2FRAMES(dsize);
|
|---|
| 92 | ddi_parea_register(&rd_parea);
|
|---|
| 93 |
|
|---|
| 94 | sysinfo_set_item_val("rd", NULL, true);
|
|---|
| 95 | sysinfo_set_item_val("rd.header_size", NULL, hsize);
|
|---|
| 96 | sysinfo_set_item_val("rd.size", NULL, dsize);
|
|---|
| 97 | sysinfo_set_item_val("rd.address.physical", NULL,
|
|---|
| 98 | (sysarg_t) KA2PA((void *) header + hsize));
|
|---|
| 99 |
|
|---|
| 100 | return RE_OK;
|
|---|
| 101 | }
|
|---|
| 102 |
|
|---|
| 103 | /** @}
|
|---|
| 104 | */
|
|---|
