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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1999 | decky | 1 | /* |
| 2071 | jermar | 2 | * Copyright (c) 2006 Martin Decky |
| 1999 | decky | 3 | * All rights reserved. |
| 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 | |||
| 29 | /** @addtogroup genericmm |
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| 30 | * @{ |
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| 31 | */ |
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| 32 | |||
| 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 | |||
| 2000 | decky | 40 | #include <lib/rd.h> |
| 2797 | jermar | 41 | #include <byteorder.h> |
| 2005 | decky | 42 | #include <mm/frame.h> |
| 43 | #include <sysinfo/sysinfo.h> |
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| 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. */ |
| 48 | |||
| 2445 | decky | 49 | /** |
| 50 | * RAM disk initialization routine. At this point, the RAM disk memory is shared |
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| 3246 | jermar | 51 | * and information about the share is provided as sysinfo values to the |
| 52 | * userspace tasks. |
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| 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; |
| 60 | |||
| 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 | |||
| 2005 | decky | 65 | uint32_t hsize; |
| 66 | uint64_t dsize; |
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| 2002 | decky | 67 | switch (header->data_type) { |
| 68 | case RD_DATA_LSB: |
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| 2005 | decky | 69 | hsize = uint32_t_le2host(header->header_size); |
| 70 | dsize = uint64_t_le2host(header->data_size); |
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| 2002 | decky | 71 | break; |
| 2005 | decky | 72 | case RD_DATA_MSB: |
| 73 | hsize = uint32_t_be2host(header->header_size); |
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| 2063 | jermar | 74 | dsize = uint64_t_be2host(header->data_size); |
| 2005 | decky | 75 | break; |
| 2002 | decky | 76 | default: |
| 77 | return RE_UNSUPPORTED; |
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| 78 | } |
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| 2005 | decky | 79 | |
| 80 | if ((hsize % FRAME_SIZE) || (dsize % FRAME_SIZE)) |
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| 81 | return RE_UNSUPPORTED; |
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| 3029 | decky | 82 | |
| 2005 | decky | 83 | if (hsize > size) |
| 84 | return RE_INVALID; |
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| 85 | |||
| 86 | if ((uint64_t) hsize + dsize > size) |
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| 87 | dsize = size - hsize; |
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| 88 | |||
| 3246 | jermar | 89 | rd_parea.pbase = ALIGN_DOWN((uintptr_t) KA2PA((void *) header + hsize), |
| 90 | FRAME_SIZE); |
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| 2015 | jermar | 91 | rd_parea.frames = SIZE2FRAMES(dsize); |
| 92 | ddi_parea_register(&rd_parea); |
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| 93 | |||
| 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, |
| 98 | (unative_t) KA2PA((void *) header + hsize)); |
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| 2002 | decky | 99 | |
| 100 | return RE_OK; |
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| 1999 | decky | 101 | } |
| 102 | |||
| 103 | /** @} |
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| 104 | */ |