root / prex-0.9.0 / bsp / boot / common / load.c @ 03e9c04a
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1 | 03e9c04a | Brad Neuman | /*-
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2 | * Copyright (c) 2005-2009, Kohsuke Ohtani
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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 | * 1. Redistributions of source code must retain the above copyright
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9 | * notice, this list of conditions and the following disclaimer.
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10 | * 2. Redistributions in binary form must reproduce the above copyright
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11 | * notice, this list of conditions and the following disclaimer in the
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12 | * documentation and/or other materials provided with the distribution.
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13 | * 3. Neither the name of the author nor the names of any co-contributors
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14 | * may be used to endorse or promote products derived from this software
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15 | * without specific prior written permission.
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16 | *
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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18 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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19 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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21 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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23 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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24 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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25 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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26 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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27 | * SUCH DAMAGE.
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28 | */
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29 | |||
30 | /*
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31 | * load.c - Load OS modules
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32 | */
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33 | |||
34 | #include <boot.h> |
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35 | #include <load.h> |
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36 | #include <sys/ar.h> |
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37 | #include <sys/bootinfo.h> |
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38 | |||
39 | /* forward declarations */
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40 | static int load_module(struct ar_hdr *, struct module *); |
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41 | static void setup_bootdisk(struct ar_hdr *); |
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42 | |||
43 | paddr_t load_base; /* current load address */
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44 | paddr_t load_start; /* start address for loading */
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45 | int nr_img; /* number of module images */ |
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46 | |||
47 | |||
48 | /*
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49 | * Load OS images - kernel, driver and boot tasks.
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50 | *
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51 | * It reads each module file image and copy it to the appropriate
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52 | * memory area. The image is built as generic an archive (.a) file.
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53 | *
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54 | * The image information is stored into the boot information area.
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55 | */
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56 | void
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57 | load_os(void)
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58 | { |
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59 | char *hdr;
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60 | struct bootinfo *bi = bootinfo;
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61 | struct module *m;
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62 | char *magic;
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63 | int i;
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64 | long len;
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65 | |||
66 | /*
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67 | * Initialize our data.
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68 | */
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69 | load_base = 0;
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70 | load_start = 0;
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71 | nr_img = 0;
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72 | |||
73 | /*
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74 | * Sanity check of archive image.
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75 | */
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76 | magic = (char *)kvtop(CONFIG_BOOTIMG_BASE);
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77 | if (strncmp(magic, ARMAG, 8)) |
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78 | panic("Invalid OS image");
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79 | |||
80 | /*
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81 | * Load kernel module.
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82 | */
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83 | hdr = (char *)((paddr_t)magic + 8); |
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84 | if (load_module((struct ar_hdr *)hdr, &bi->kernel)) |
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85 | panic("Can not load kernel");
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86 | |||
87 | /*
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88 | * Load driver module.
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89 | */
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90 | len = atol((char *)&((struct ar_hdr *)hdr)->ar_size); |
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91 | len += len % 2; /* even alignment */ |
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92 | if (len == 0) |
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93 | panic("Invalid driver image");
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94 | hdr = (char *)((paddr_t)hdr + sizeof(struct ar_hdr) + len); |
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95 | if (load_module((struct ar_hdr *)hdr, &bi->driver)) |
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96 | panic("Can not load driver");
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97 | |||
98 | /*
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99 | * Load boot tasks.
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100 | */
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101 | i = 0;
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102 | m = (struct module *)&bi->tasks[0]; |
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103 | while (1) { |
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104 | /* Proceed to next archive header */
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105 | len = atol((char *)&((struct ar_hdr *)hdr)->ar_size); |
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106 | len += len % 2; /* even alignment */ |
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107 | if (len == 0) |
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108 | break;
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109 | hdr = (char *)((paddr_t)hdr + sizeof(struct ar_hdr) + len); |
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110 | |||
111 | /* Check archive header */
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112 | if (strncmp((char *)&((struct ar_hdr *)hdr)->ar_fmag, |
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113 | ARFMAG, 2))
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114 | break;
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115 | |||
116 | /* Load boot disk image */
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117 | if (!strncmp((char *)&((struct ar_hdr *)hdr)->ar_name, |
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118 | "bootdisk.a", 10)) { |
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119 | setup_bootdisk((struct ar_hdr *)hdr);
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120 | continue;
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121 | } |
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122 | |||
123 | /* Load task */
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124 | if (load_module((struct ar_hdr *)hdr, m)) |
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125 | break;
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126 | i++; |
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127 | m++; |
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128 | } |
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129 | |||
130 | bi->nr_tasks = i; |
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131 | |||
132 | if (bi->nr_tasks == 0) |
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133 | panic("No boot task found!");
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134 | |||
135 | /*
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136 | * Reserve single memory block for all boot modules.
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137 | * This includes kernel, driver, and boot tasks.
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138 | */
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139 | i = bi->nr_rams; |
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140 | bi->ram[i].base = load_start; |
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141 | bi->ram[i].size = (size_t)(load_base - load_start); |
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142 | bi->ram[i].type = MT_RESERVED; |
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143 | bi->nr_rams++; |
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144 | } |
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145 | |||
146 | /*
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147 | * Load module.
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148 | * Return 0 on success, -1 on failure.
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149 | */
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150 | static int |
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151 | load_module(struct ar_hdr *hdr, struct module *m) |
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152 | { |
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153 | char *c;
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154 | |||
155 | if (strncmp((char *)&hdr->ar_fmag, ARFMAG, 2)) { |
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156 | DPRINTF(("Invalid image %s\n", hdr->ar_name));
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157 | return -1; |
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158 | } |
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159 | strlcpy(m->name, hdr->ar_name, sizeof(m->name));
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160 | c = m->name; |
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161 | while (*c != '/' && *c != ' ') |
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162 | c++; |
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163 | *c = '\0';
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164 | |||
165 | DPRINTF(("loading: hdr=%lx module=%lx name=%s\n",
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166 | (paddr_t)hdr, (paddr_t)m, m->name)); |
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167 | |||
168 | if (load_elf((char *)hdr + sizeof(struct ar_hdr), m)) |
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169 | panic("Load error");
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170 | |||
171 | return 0; |
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172 | } |
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173 | |||
174 | /*
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175 | * Setup boot disk
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176 | */
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177 | static void |
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178 | setup_bootdisk(struct ar_hdr *hdr)
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179 | { |
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180 | struct bootinfo *bi = bootinfo;
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181 | paddr_t base; |
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182 | size_t size; |
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183 | |||
184 | /*
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185 | * Store image information.
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186 | */
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187 | if (strncmp((char *)&hdr->ar_fmag, ARFMAG, 2)) { |
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188 | DPRINTF(("Invalid bootdisk image\n"));
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189 | return;
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190 | } |
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191 | size = (size_t)atol((char *)&hdr->ar_size);
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192 | size += size % 2; /* even alignment */ |
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193 | if (size == 0) { |
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194 | DPRINTF(("Size of bootdisk is zero\n"));
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195 | return;
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196 | } |
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197 | base = (paddr_t)hdr + sizeof(struct ar_hdr); |
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198 | bi->bootdisk.base = base; |
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199 | bi->bootdisk.size = size; |
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200 | |||
201 | #if !defined(CONFIG_ROMBOOT)
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202 | /*
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203 | * Reserve memory for boot disk if the image
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204 | * was copied to RAM.
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205 | */
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206 | bi->ram[bi->nr_rams].base = base; |
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207 | bi->ram[bi->nr_rams].size = size; |
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208 | bi->ram[bi->nr_rams].type = MT_BOOTDISK; |
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209 | bi->nr_rams++; |
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210 | #endif
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211 | DPRINTF(("bootdisk base=%lx size=%lx\n",
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212 | bi->bootdisk.base, bi->bootdisk.size)); |
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213 | } |