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