1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * Copyright (c) 2011 The Chromium OS Authors. 4 * (C) Copyright 2002 5 * Daniel Engstrm, Omicron Ceti AB, <daniel (at) omicron.se> 6 */ 7 8 /* 9 * Linux x86 zImage and bzImage loading 10 * 11 * based on the procdure described in 12 * linux/Documentation/i386/boot.txt 13 */ 14 15 #include <common.h> 16 #include <malloc.h> 17 #include <asm/acpi_table.h> 18 #include <asm/io.h> 19 #include <asm/ptrace.h> 20 #include <asm/zimage.h> 21 #include <asm/byteorder.h> 22 #include <asm/bootm.h> 23 #include <asm/bootparam.h> 24 #ifdef CONFIG_SYS_COREBOOT 25 #include <asm/arch/timestamp.h> 26 #endif 27 #include <linux/compiler.h> 28 #include <linux/libfdt.h> 29 30 /* 31 * Memory lay-out: 32 * 33 * relative to setup_base (which is 0x90000 currently) 34 * 35 * 0x0000-0x7FFF Real mode kernel 36 * 0x8000-0x8FFF Stack and heap 37 * 0x9000-0x90FF Kernel command line 38 */ 39 #define DEFAULT_SETUP_BASE 0x90000 40 #define COMMAND_LINE_OFFSET 0x9000 41 #define HEAP_END_OFFSET 0x8e00 42 43 #define COMMAND_LINE_SIZE 2048 44 45 static void build_command_line(char *command_line, int auto_boot) 46 { 47 char *env_command_line; 48 49 command_line[0] = '\0'; 50 51 env_command_line = env_get("bootargs"); 52 53 /* set console= argument if we use a serial console */ 54 if (!strstr(env_command_line, "console=")) { 55 if (!strcmp(env_get("stdout"), "serial")) { 56 57 /* We seem to use serial console */ 58 sprintf(command_line, "console=ttyS0,%s ", 59 env_get("baudrate")); 60 } 61 } 62 63 if (auto_boot) 64 strcat(command_line, "auto "); 65 66 if (env_command_line) 67 strcat(command_line, env_command_line); 68 69 printf("Kernel command line: \"%s\"\n", command_line); 70 } 71 72 static int kernel_magic_ok(struct setup_header *hdr) 73 { 74 if (KERNEL_MAGIC != hdr->boot_flag) { 75 printf("Error: Invalid Boot Flag " 76 "(found 0x%04x, expected 0x%04x)\n", 77 hdr->boot_flag, KERNEL_MAGIC); 78 return 0; 79 } else { 80 printf("Valid Boot Flag\n"); 81 return 1; 82 } 83 } 84 85 static int get_boot_protocol(struct setup_header *hdr) 86 { 87 if (hdr->header == KERNEL_V2_MAGIC) { 88 printf("Magic signature found\n"); 89 return hdr->version; 90 } else { 91 /* Very old kernel */ 92 printf("Magic signature not found\n"); 93 return 0x0100; 94 } 95 } 96 97 static int setup_device_tree(struct setup_header *hdr, const void *fdt_blob) 98 { 99 int bootproto = get_boot_protocol(hdr); 100 struct setup_data *sd; 101 int size; 102 103 if (bootproto < 0x0209) 104 return -ENOTSUPP; 105 106 if (!fdt_blob) 107 return 0; 108 109 size = fdt_totalsize(fdt_blob); 110 if (size < 0) 111 return -EINVAL; 112 113 size += sizeof(struct setup_data); 114 sd = (struct setup_data *)malloc(size); 115 if (!sd) { 116 printf("Not enough memory for DTB setup data\n"); 117 return -ENOMEM; 118 } 119 120 sd->next = hdr->setup_data; 121 sd->type = SETUP_DTB; 122 sd->len = fdt_totalsize(fdt_blob); 123 memcpy(sd->data, fdt_blob, sd->len); 124 hdr->setup_data = (unsigned long)sd; 125 126 return 0; 127 } 128 129 struct boot_params *load_zimage(char *image, unsigned long kernel_size, 130 ulong *load_addressp) 131 { 132 struct boot_params *setup_base; 133 int setup_size; 134 int bootproto; 135 int big_image; 136 137 struct boot_params *params = (struct boot_params *)image; 138 struct setup_header *hdr = ¶ms->hdr; 139 140 /* base address for real-mode segment */ 141 setup_base = (struct boot_params *)DEFAULT_SETUP_BASE; 142 143 if (!kernel_magic_ok(hdr)) 144 return 0; 145 146 /* determine size of setup */ 147 if (0 == hdr->setup_sects) { 148 printf("Setup Sectors = 0 (defaulting to 4)\n"); 149 setup_size = 5 * 512; 150 } else { 151 setup_size = (hdr->setup_sects + 1) * 512; 152 } 153 154 printf("Setup Size = 0x%8.8lx\n", (ulong)setup_size); 155 156 if (setup_size > SETUP_MAX_SIZE) 157 printf("Error: Setup is too large (%d bytes)\n", setup_size); 158 159 /* determine boot protocol version */ 160 bootproto = get_boot_protocol(hdr); 161 162 printf("Using boot protocol version %x.%02x\n", 163 (bootproto & 0xff00) >> 8, bootproto & 0xff); 164 165 if (bootproto >= 0x0200) { 166 if (hdr->setup_sects >= 15) { 167 printf("Linux kernel version %s\n", 168 (char *)params + 169 hdr->kernel_version + 0x200); 170 } else { 171 printf("Setup Sectors < 15 - " 172 "Cannot print kernel version.\n"); 173 } 174 } 175 176 /* Determine image type */ 177 big_image = (bootproto >= 0x0200) && 178 (hdr->loadflags & BIG_KERNEL_FLAG); 179 180 /* Determine load address */ 181 if (big_image) 182 *load_addressp = BZIMAGE_LOAD_ADDR; 183 else 184 *load_addressp = ZIMAGE_LOAD_ADDR; 185 186 printf("Building boot_params at 0x%8.8lx\n", (ulong)setup_base); 187 memset(setup_base, 0, sizeof(*setup_base)); 188 setup_base->hdr = params->hdr; 189 190 if (bootproto >= 0x0204) 191 kernel_size = hdr->syssize * 16; 192 else 193 kernel_size -= setup_size; 194 195 if (bootproto == 0x0100) { 196 /* 197 * A very old kernel MUST have its real-mode code 198 * loaded at 0x90000 199 */ 200 if ((ulong)setup_base != 0x90000) { 201 /* Copy the real-mode kernel */ 202 memmove((void *)0x90000, setup_base, setup_size); 203 204 /* Copy the command line */ 205 memmove((void *)0x99000, 206 (u8 *)setup_base + COMMAND_LINE_OFFSET, 207 COMMAND_LINE_SIZE); 208 209 /* Relocated */ 210 setup_base = (struct boot_params *)0x90000; 211 } 212 213 /* It is recommended to clear memory up to the 32K mark */ 214 memset((u8 *)0x90000 + setup_size, 0, 215 SETUP_MAX_SIZE - setup_size); 216 } 217 218 if (big_image) { 219 if (kernel_size > BZIMAGE_MAX_SIZE) { 220 printf("Error: bzImage kernel too big! " 221 "(size: %ld, max: %d)\n", 222 kernel_size, BZIMAGE_MAX_SIZE); 223 return 0; 224 } 225 } else if ((kernel_size) > ZIMAGE_MAX_SIZE) { 226 printf("Error: zImage kernel too big! (size: %ld, max: %d)\n", 227 kernel_size, ZIMAGE_MAX_SIZE); 228 return 0; 229 } 230 231 printf("Loading %s at address %lx (%ld bytes)\n", 232 big_image ? "bzImage" : "zImage", *load_addressp, kernel_size); 233 234 memmove((void *)*load_addressp, image + setup_size, kernel_size); 235 236 return setup_base; 237 } 238 239 int setup_zimage(struct boot_params *setup_base, char *cmd_line, int auto_boot, 240 unsigned long initrd_addr, unsigned long initrd_size) 241 { 242 struct setup_header *hdr = &setup_base->hdr; 243 int bootproto = get_boot_protocol(hdr); 244 245 setup_base->e820_entries = install_e820_map( 246 ARRAY_SIZE(setup_base->e820_map), setup_base->e820_map); 247 248 if (bootproto == 0x0100) { 249 setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC; 250 setup_base->screen_info.cl_offset = COMMAND_LINE_OFFSET; 251 } 252 if (bootproto >= 0x0200) { 253 hdr->type_of_loader = 8; 254 255 if (initrd_addr) { 256 printf("Initial RAM disk at linear address " 257 "0x%08lx, size %ld bytes\n", 258 initrd_addr, initrd_size); 259 260 hdr->ramdisk_image = initrd_addr; 261 hdr->ramdisk_size = initrd_size; 262 } 263 } 264 265 if (bootproto >= 0x0201) { 266 hdr->heap_end_ptr = HEAP_END_OFFSET; 267 hdr->loadflags |= HEAP_FLAG; 268 } 269 270 if (cmd_line) { 271 if (bootproto >= 0x0202) { 272 hdr->cmd_line_ptr = (uintptr_t)cmd_line; 273 } else if (bootproto >= 0x0200) { 274 setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC; 275 setup_base->screen_info.cl_offset = 276 (uintptr_t)cmd_line - (uintptr_t)setup_base; 277 278 hdr->setup_move_size = 0x9100; 279 } 280 281 /* build command line at COMMAND_LINE_OFFSET */ 282 build_command_line(cmd_line, auto_boot); 283 } 284 285 #ifdef CONFIG_INTEL_MID 286 if (bootproto >= 0x0207) 287 hdr->hardware_subarch = X86_SUBARCH_INTEL_MID; 288 #endif 289 290 #ifdef CONFIG_GENERATE_ACPI_TABLE 291 if (bootproto >= 0x020e) 292 hdr->acpi_rsdp_addr = acpi_get_rsdp_addr(); 293 #endif 294 295 setup_device_tree(hdr, (const void *)env_get_hex("fdtaddr", 0)); 296 setup_video(&setup_base->screen_info); 297 298 return 0; 299 } 300 301 void setup_pcat_compatibility(void) 302 __attribute__((weak, alias("__setup_pcat_compatibility"))); 303 304 void __setup_pcat_compatibility(void) 305 { 306 } 307 308 int do_zboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[]) 309 { 310 struct boot_params *base_ptr; 311 void *bzImage_addr = NULL; 312 ulong load_address; 313 char *s; 314 ulong bzImage_size = 0; 315 ulong initrd_addr = 0; 316 ulong initrd_size = 0; 317 318 disable_interrupts(); 319 320 /* Setup board for maximum PC/AT Compatibility */ 321 setup_pcat_compatibility(); 322 323 if (argc >= 2) { 324 /* argv[1] holds the address of the bzImage */ 325 s = argv[1]; 326 } else { 327 s = env_get("fileaddr"); 328 } 329 330 if (s) 331 bzImage_addr = (void *)simple_strtoul(s, NULL, 16); 332 333 if (argc >= 3) { 334 /* argv[2] holds the size of the bzImage */ 335 bzImage_size = simple_strtoul(argv[2], NULL, 16); 336 } 337 338 if (argc >= 4) 339 initrd_addr = simple_strtoul(argv[3], NULL, 16); 340 if (argc >= 5) 341 initrd_size = simple_strtoul(argv[4], NULL, 16); 342 343 /* Lets look for */ 344 base_ptr = load_zimage(bzImage_addr, bzImage_size, &load_address); 345 346 if (!base_ptr) { 347 puts("## Kernel loading failed ...\n"); 348 return -1; 349 } 350 if (setup_zimage(base_ptr, (char *)base_ptr + COMMAND_LINE_OFFSET, 351 0, initrd_addr, initrd_size)) { 352 puts("Setting up boot parameters failed ...\n"); 353 return -1; 354 } 355 356 /* we assume that the kernel is in place */ 357 return boot_linux_kernel((ulong)base_ptr, load_address, false); 358 } 359 360 U_BOOT_CMD( 361 zboot, 5, 0, do_zboot, 362 "Boot bzImage", 363 "[addr] [size] [initrd addr] [initrd size]\n" 364 " addr - The optional starting address of the bzimage.\n" 365 " If not set it defaults to the environment\n" 366 " variable \"fileaddr\".\n" 367 " size - The optional size of the bzimage. Defaults to\n" 368 " zero.\n" 369 " initrd addr - The address of the initrd image to use, if any.\n" 370 " initrd size - The size of the initrd image to use, if any.\n" 371 ); 372
