| 1 | /*
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| 2 | * Copyright (c) 2009 Jiri Svoboda
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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 genarch
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| 30 | * @{
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| 31 | */
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| 32 | /** @file
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| 33 | */
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| 34 |
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| 35 | #include <genarch/multiboot/multiboot.h>
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| 36 | #include <arch/types.h>
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| 37 | #include <typedefs.h>
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| 38 | #include <config.h>
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| 39 | #include <string.h>
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| 40 | #include <macros.h>
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| 41 |
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| 42 | /** Extract command name from the multiboot module command line.
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| 43 | *
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| 44 | * @param buf Destination buffer (will always NULL-terminate).
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| 45 | * @param sz Size of destination buffer (in bytes).
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| 46 | * @param cmd_line Input string (the command line).
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| 47 | *
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| 48 | */
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| 49 | static void extract_command(char *buf, size_t sz, const char *cmd_line)
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| 50 | {
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| 51 | /* Find the first space. */
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| 52 | const char *end = str_chr(cmd_line, ' ');
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| 53 | if (end == NULL)
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| 54 | end = cmd_line + str_size(cmd_line);
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| 55 |
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| 56 | /*
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| 57 | * Find last occurence of '/' before 'end'. If found, place start at
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| 58 | * next character. Otherwise, place start at beginning of buffer.
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| 59 | */
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| 60 | const char *cp = end;
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| 61 | const char *start = buf;
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| 62 |
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| 63 | while (cp != start) {
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| 64 | if (*cp == '/') {
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| 65 | start = cp + 1;
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| 66 | break;
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| 67 | }
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| 68 | cp--;
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| 69 | }
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| 70 |
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| 71 | /* Copy the command. */
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| 72 | str_ncpy(buf, start, min(sz, (size_t) (end - start) + 1));
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| 73 | }
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| 74 |
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| 75 | /** Parse multiboot information structure.
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| 76 | *
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| 77 | * If @a signature does not contain a valid multiboot signature,
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| 78 | * assumes no multiboot information is available.
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| 79 | *
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| 80 | * @param signature Should contain the multiboot signature.
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| 81 | * @param mi Pointer to the multiboot information structure.
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| 82 | */
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| 83 | void multiboot_info_parse(uint32_t signature, const multiboot_info_t *mi)
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| 84 | {
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| 85 | uint32_t flags;
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| 86 |
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| 87 | if (signature == MULTIBOOT_LOADER_MAGIC)
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| 88 | flags = mi->flags;
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| 89 | else {
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| 90 | /* No multiboot info available. */
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| 91 | flags = 0;
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| 92 | }
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| 93 |
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| 94 | /* Copy module information. */
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| 95 | uint32_t i;
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| 96 | if ((flags & MBINFO_FLAGS_MODS) != 0) {
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| 97 | init.cnt = min(mi->mods_count, CONFIG_INIT_TASKS);
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| 98 | multiboot_mod_t *mods
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| 99 | = (multiboot_mod_t *) MULTIBOOT_PTR(mi->mods_addr);
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| 100 |
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| 101 | for (i = 0; i < init.cnt; i++) {
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| 102 | init.tasks[i].addr = PA2KA(mods[i].start);
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| 103 | init.tasks[i].size = mods[i].end - mods[i].start;
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| 104 |
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| 105 | /* Copy command line, if available. */
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| 106 | if (mods[i].string) {
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| 107 | extract_command(init.tasks[i].name,
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| 108 | CONFIG_TASK_NAME_BUFLEN,
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| 109 | MULTIBOOT_PTR(mods[i].string));
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| 110 | } else
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| 111 | init.tasks[i].name[0] = 0;
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| 112 | }
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| 113 | } else
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| 114 | init.cnt = 0;
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| 115 |
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| 116 | /* Copy memory map. */
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| 117 |
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| 118 | if ((flags & MBINFO_FLAGS_MMAP) != 0) {
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| 119 | int32_t mmap_length = mi->mmap_length;
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| 120 | multiboot_mmap_t *mme = MULTIBOOT_PTR(mi->mmap_addr);
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| 121 | e820counter = 0;
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| 122 |
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| 123 | i = 0;
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| 124 | while ((mmap_length > 0) && (i < MEMMAP_E820_MAX_RECORDS)) {
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| 125 | e820table[i++] = mme->mm_info;
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| 126 |
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| 127 | /* Compute address of next structure. */
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| 128 | uint32_t size = sizeof(mme->size) + mme->size;
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| 129 | mme = ((void *) mme) + size;
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| 130 | mmap_length -= size;
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| 131 | }
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| 132 |
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| 133 | e820counter = i;
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| 134 | } else
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| 135 | e820counter = 0;
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| 136 | }
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| 137 |
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| 138 | /** @}
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| 139 | */
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