1 /* 2 * QEMU PC System Emulator 3 * 4 * Copyright (c) 2003-2004 Fabrice Bellard 5 * 6 * Permission is hereby granted, free of charge, to any person obtaining a copy 7 * of this software and associated documentation files (the "Software"), to deal 8 * in the Software without restriction, including without limitation the rights 9 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 10 * copies of the Software, and to permit persons to whom the Software is 11 * furnished to do so, subject to the following conditions: 12 * 13 * The above copyright notice and this permission notice shall be included in 14 * all copies or substantial portions of the Software. 15 * 16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 21 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 22 * THE SOFTWARE. 23 */ 24 25 #include "qemu/osdep.h" 26 #include "hw/hw.h" 27 #include "hw/nvram/fw_cfg.h" 28 #include "multiboot.h" 29 #include "hw/loader.h" 30 #include "elf.h" 31 #include "sysemu/sysemu.h" 32 33 /* Show multiboot debug output */ 34 //#define DEBUG_MULTIBOOT 35 36 #ifdef DEBUG_MULTIBOOT 37 #define mb_debug(a...) fprintf(stderr, ## a) 38 #else 39 #define mb_debug(a...) 40 #endif 41 42 #define MULTIBOOT_STRUCT_ADDR 0x9000 43 44 #if MULTIBOOT_STRUCT_ADDR > 0xf0000 45 #error multiboot struct needs to fit in 16 bit real mode 46 #endif 47 48 enum { 49 /* Multiboot info */ 50 MBI_FLAGS = 0, 51 MBI_MEM_LOWER = 4, 52 MBI_MEM_UPPER = 8, 53 MBI_BOOT_DEVICE = 12, 54 MBI_CMDLINE = 16, 55 MBI_MODS_COUNT = 20, 56 MBI_MODS_ADDR = 24, 57 MBI_MMAP_ADDR = 48, 58 MBI_BOOTLOADER = 64, 59 60 MBI_SIZE = 88, 61 62 /* Multiboot modules */ 63 MB_MOD_START = 0, 64 MB_MOD_END = 4, 65 MB_MOD_CMDLINE = 8, 66 67 MB_MOD_SIZE = 16, 68 69 /* Region offsets */ 70 ADDR_E820_MAP = MULTIBOOT_STRUCT_ADDR + 0, 71 ADDR_MBI = ADDR_E820_MAP + 0x500, 72 73 /* Multiboot flags */ 74 MULTIBOOT_FLAGS_MEMORY = 1 << 0, 75 MULTIBOOT_FLAGS_BOOT_DEVICE = 1 << 1, 76 MULTIBOOT_FLAGS_CMDLINE = 1 << 2, 77 MULTIBOOT_FLAGS_MODULES = 1 << 3, 78 MULTIBOOT_FLAGS_MMAP = 1 << 6, 79 MULTIBOOT_FLAGS_BOOTLOADER = 1 << 9, 80 }; 81 82 typedef struct { 83 /* buffer holding kernel, cmdlines and mb_infos */ 84 void *mb_buf; 85 /* address in target */ 86 hwaddr mb_buf_phys; 87 /* size of mb_buf in bytes */ 88 unsigned mb_buf_size; 89 /* offset of mb-info's in bytes */ 90 hwaddr offset_mbinfo; 91 /* offset in buffer for cmdlines in bytes */ 92 hwaddr offset_cmdlines; 93 /* offset in buffer for bootloader name in bytes */ 94 hwaddr offset_bootloader; 95 /* offset of modules in bytes */ 96 hwaddr offset_mods; 97 /* available slots for mb modules infos */ 98 int mb_mods_avail; 99 /* currently used slots of mb modules */ 100 int mb_mods_count; 101 } MultibootState; 102 103 const char *bootloader_name = "qemu"; 104 105 static uint32_t mb_add_cmdline(MultibootState *s, const char *cmdline) 106 { 107 hwaddr p = s->offset_cmdlines; 108 char *b = (char *)s->mb_buf + p; 109 110 get_opt_value(b, strlen(cmdline) + 1, cmdline); 111 s->offset_cmdlines += strlen(b) + 1; 112 return s->mb_buf_phys + p; 113 } 114 115 static uint32_t mb_add_bootloader(MultibootState *s, const char *bootloader) 116 { 117 hwaddr p = s->offset_bootloader; 118 char *b = (char *)s->mb_buf + p; 119 120 memcpy(b, bootloader, strlen(bootloader) + 1); 121 s->offset_bootloader += strlen(b) + 1; 122 return s->mb_buf_phys + p; 123 } 124 125 static void mb_add_mod(MultibootState *s, 126 hwaddr start, hwaddr end, 127 hwaddr cmdline_phys) 128 { 129 char *p; 130 assert(s->mb_mods_count < s->mb_mods_avail); 131 132 p = (char *)s->mb_buf + s->offset_mbinfo + MB_MOD_SIZE * s->mb_mods_count; 133 134 stl_p(p + MB_MOD_START, start); 135 stl_p(p + MB_MOD_END, end); 136 stl_p(p + MB_MOD_CMDLINE, cmdline_phys); 137 138 mb_debug("mod%02d: "TARGET_FMT_plx" - "TARGET_FMT_plx"\n", 139 s->mb_mods_count, start, end); 140 141 s->mb_mods_count++; 142 } 143 144 int load_multiboot(FWCfgState *fw_cfg, 145 FILE *f, 146 const char *kernel_filename, 147 const char *initrd_filename, 148 const char *kernel_cmdline, 149 int kernel_file_size, 150 uint8_t *header) 151 { 152 int i, is_multiboot = 0; 153 uint32_t flags = 0; 154 uint32_t mh_entry_addr; 155 uint32_t mh_load_addr; 156 uint32_t mb_kernel_size; 157 MultibootState mbs; 158 uint8_t bootinfo[MBI_SIZE]; 159 uint8_t *mb_bootinfo_data; 160 uint32_t cmdline_len; 161 162 /* Ok, let's see if it is a multiboot image. 163 The header is 12x32bit long, so the latest entry may be 8192 - 48. */ 164 for (i = 0; i < (8192 - 48); i += 4) { 165 if (ldl_p(header+i) == 0x1BADB002) { 166 uint32_t checksum = ldl_p(header+i+8); 167 flags = ldl_p(header+i+4); 168 checksum += flags; 169 checksum += (uint32_t)0x1BADB002; 170 if (!checksum) { 171 is_multiboot = 1; 172 break; 173 } 174 } 175 } 176 177 if (!is_multiboot) 178 return 0; /* no multiboot */ 179 180 mb_debug("qemu: I believe we found a multiboot image!\n"); 181 memset(bootinfo, 0, sizeof(bootinfo)); 182 memset(&mbs, 0, sizeof(mbs)); 183 184 if (flags & 0x00000004) { /* MULTIBOOT_HEADER_HAS_VBE */ 185 fprintf(stderr, "qemu: multiboot knows VBE. we don't.\n"); 186 } 187 if (!(flags & 0x00010000)) { /* MULTIBOOT_HEADER_HAS_ADDR */ 188 uint64_t elf_entry; 189 uint64_t elf_low, elf_high; 190 int kernel_size; 191 fclose(f); 192 193 if (((struct elf64_hdr*)header)->e_machine == EM_X86_64) { 194 fprintf(stderr, "Cannot load x86-64 image, give a 32bit one.\n"); 195 exit(1); 196 } 197 198 kernel_size = load_elf(kernel_filename, NULL, NULL, &elf_entry, 199 &elf_low, &elf_high, 0, I386_ELF_MACHINE, 200 0, 0); 201 if (kernel_size < 0) { 202 fprintf(stderr, "Error while loading elf kernel\n"); 203 exit(1); 204 } 205 mh_load_addr = elf_low; 206 mb_kernel_size = elf_high - elf_low; 207 mh_entry_addr = elf_entry; 208 209 mbs.mb_buf = g_malloc(mb_kernel_size); 210 if (rom_copy(mbs.mb_buf, mh_load_addr, mb_kernel_size) != mb_kernel_size) { 211 fprintf(stderr, "Error while fetching elf kernel from rom\n"); 212 exit(1); 213 } 214 215 mb_debug("qemu: loading multiboot-elf kernel (%#x bytes) with entry %#zx\n", 216 mb_kernel_size, (size_t)mh_entry_addr); 217 } else { 218 /* Valid if mh_flags sets MULTIBOOT_HEADER_HAS_ADDR. */ 219 uint32_t mh_header_addr = ldl_p(header+i+12); 220 uint32_t mh_load_end_addr = ldl_p(header+i+20); 221 uint32_t mh_bss_end_addr = ldl_p(header+i+24); 222 mh_load_addr = ldl_p(header+i+16); 223 uint32_t mb_kernel_text_offset = i - (mh_header_addr - mh_load_addr); 224 uint32_t mb_load_size = 0; 225 mh_entry_addr = ldl_p(header+i+28); 226 227 if (mh_load_end_addr) { 228 mb_kernel_size = mh_bss_end_addr - mh_load_addr; 229 mb_load_size = mh_load_end_addr - mh_load_addr; 230 } else { 231 mb_kernel_size = kernel_file_size - mb_kernel_text_offset; 232 mb_load_size = mb_kernel_size; 233 } 234 235 /* Valid if mh_flags sets MULTIBOOT_HEADER_HAS_VBE. 236 uint32_t mh_mode_type = ldl_p(header+i+32); 237 uint32_t mh_width = ldl_p(header+i+36); 238 uint32_t mh_height = ldl_p(header+i+40); 239 uint32_t mh_depth = ldl_p(header+i+44); */ 240 241 mb_debug("multiboot: mh_header_addr = %#x\n", mh_header_addr); 242 mb_debug("multiboot: mh_load_addr = %#x\n", mh_load_addr); 243 mb_debug("multiboot: mh_load_end_addr = %#x\n", mh_load_end_addr); 244 mb_debug("multiboot: mh_bss_end_addr = %#x\n", mh_bss_end_addr); 245 mb_debug("qemu: loading multiboot kernel (%#x bytes) at %#x\n", 246 mb_load_size, mh_load_addr); 247 248 mbs.mb_buf = g_malloc(mb_kernel_size); 249 fseek(f, mb_kernel_text_offset, SEEK_SET); 250 if (fread(mbs.mb_buf, 1, mb_load_size, f) != mb_load_size) { 251 fprintf(stderr, "fread() failed\n"); 252 exit(1); 253 } 254 memset(mbs.mb_buf + mb_load_size, 0, mb_kernel_size - mb_load_size); 255 fclose(f); 256 } 257 258 mbs.mb_buf_phys = mh_load_addr; 259 260 mbs.mb_buf_size = TARGET_PAGE_ALIGN(mb_kernel_size); 261 mbs.offset_mbinfo = mbs.mb_buf_size; 262 263 /* Calculate space for cmdlines, bootloader name, and mb_mods */ 264 cmdline_len = strlen(kernel_filename) + 1; 265 cmdline_len += strlen(kernel_cmdline) + 1; 266 if (initrd_filename) { 267 const char *r = initrd_filename; 268 cmdline_len += strlen(r) + 1; 269 mbs.mb_mods_avail = 1; 270 while (*(r = get_opt_value(NULL, 0, r))) { 271 mbs.mb_mods_avail++; 272 r++; 273 } 274 } 275 276 mbs.mb_buf_size += cmdline_len; 277 mbs.mb_buf_size += MB_MOD_SIZE * mbs.mb_mods_avail; 278 mbs.mb_buf_size += strlen(bootloader_name) + 1; 279 280 mbs.mb_buf_size = TARGET_PAGE_ALIGN(mbs.mb_buf_size); 281 282 /* enlarge mb_buf to hold cmdlines, bootloader, mb-info structs */ 283 mbs.mb_buf = g_realloc(mbs.mb_buf, mbs.mb_buf_size); 284 mbs.offset_cmdlines = mbs.offset_mbinfo + mbs.mb_mods_avail * MB_MOD_SIZE; 285 mbs.offset_bootloader = mbs.offset_cmdlines + cmdline_len; 286 287 if (initrd_filename) { 288 char *next_initrd, not_last; 289 290 mbs.offset_mods = mbs.mb_buf_size; 291 292 do { 293 char *next_space; 294 int mb_mod_length; 295 uint32_t offs = mbs.mb_buf_size; 296 297 next_initrd = (char *)get_opt_value(NULL, 0, initrd_filename); 298 not_last = *next_initrd; 299 *next_initrd = '\0'; 300 /* if a space comes after the module filename, treat everything 301 after that as parameters */ 302 hwaddr c = mb_add_cmdline(&mbs, initrd_filename); 303 if ((next_space = strchr(initrd_filename, ' '))) 304 *next_space = '\0'; 305 mb_debug("multiboot loading module: %s\n", initrd_filename); 306 mb_mod_length = get_image_size(initrd_filename); 307 if (mb_mod_length < 0) { 308 fprintf(stderr, "Failed to open file '%s'\n", initrd_filename); 309 exit(1); 310 } 311 312 mbs.mb_buf_size = TARGET_PAGE_ALIGN(mb_mod_length + mbs.mb_buf_size); 313 mbs.mb_buf = g_realloc(mbs.mb_buf, mbs.mb_buf_size); 314 315 load_image(initrd_filename, (unsigned char *)mbs.mb_buf + offs); 316 mb_add_mod(&mbs, mbs.mb_buf_phys + offs, 317 mbs.mb_buf_phys + offs + mb_mod_length, c); 318 319 mb_debug("mod_start: %p\nmod_end: %p\n cmdline: "TARGET_FMT_plx"\n", 320 (char *)mbs.mb_buf + offs, 321 (char *)mbs.mb_buf + offs + mb_mod_length, c); 322 initrd_filename = next_initrd+1; 323 } while (not_last); 324 } 325 326 /* Commandline support */ 327 char kcmdline[strlen(kernel_filename) + strlen(kernel_cmdline) + 2]; 328 snprintf(kcmdline, sizeof(kcmdline), "%s %s", 329 kernel_filename, kernel_cmdline); 330 stl_p(bootinfo + MBI_CMDLINE, mb_add_cmdline(&mbs, kcmdline)); 331 332 stl_p(bootinfo + MBI_BOOTLOADER, mb_add_bootloader(&mbs, bootloader_name)); 333 334 stl_p(bootinfo + MBI_MODS_ADDR, mbs.mb_buf_phys + mbs.offset_mbinfo); 335 stl_p(bootinfo + MBI_MODS_COUNT, mbs.mb_mods_count); /* mods_count */ 336 337 /* the kernel is where we want it to be now */ 338 stl_p(bootinfo + MBI_FLAGS, MULTIBOOT_FLAGS_MEMORY 339 | MULTIBOOT_FLAGS_BOOT_DEVICE 340 | MULTIBOOT_FLAGS_CMDLINE 341 | MULTIBOOT_FLAGS_MODULES 342 | MULTIBOOT_FLAGS_MMAP 343 | MULTIBOOT_FLAGS_BOOTLOADER); 344 stl_p(bootinfo + MBI_BOOT_DEVICE, 0x8000ffff); /* XXX: use the -boot switch? */ 345 stl_p(bootinfo + MBI_MMAP_ADDR, ADDR_E820_MAP); 346 347 mb_debug("multiboot: mh_entry_addr = %#x\n", mh_entry_addr); 348 mb_debug(" mb_buf_phys = "TARGET_FMT_plx"\n", mbs.mb_buf_phys); 349 mb_debug(" mod_start = "TARGET_FMT_plx"\n", mbs.mb_buf_phys + mbs.offset_mods); 350 mb_debug(" mb_mods_count = %d\n", mbs.mb_mods_count); 351 352 /* save bootinfo off the stack */ 353 mb_bootinfo_data = g_malloc(sizeof(bootinfo)); 354 memcpy(mb_bootinfo_data, bootinfo, sizeof(bootinfo)); 355 356 /* Pass variables to option rom */ 357 fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ENTRY, mh_entry_addr); 358 fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_ADDR, mh_load_addr); 359 fw_cfg_add_i32(fw_cfg, FW_CFG_KERNEL_SIZE, mbs.mb_buf_size); 360 fw_cfg_add_bytes(fw_cfg, FW_CFG_KERNEL_DATA, 361 mbs.mb_buf, mbs.mb_buf_size); 362 363 fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_ADDR, ADDR_MBI); 364 fw_cfg_add_i32(fw_cfg, FW_CFG_INITRD_SIZE, sizeof(bootinfo)); 365 fw_cfg_add_bytes(fw_cfg, FW_CFG_INITRD_DATA, mb_bootinfo_data, 366 sizeof(bootinfo)); 367 368 option_rom[nb_option_roms].name = "multiboot.bin"; 369 option_rom[nb_option_roms].bootindex = 0; 370 nb_option_roms++; 371 372 return 1; /* yes, we are multiboot */ 373 } 374