1 /* 2 * Copyright (c) 2011 The Chromium OS Authors. 3 * (C) Copyright 2002 4 * Daniel Engström, Omicron Ceti AB, <daniel@omicron.se> 5 * 6 * SPDX-License-Identifier: GPL-2.0+ 7 */ 8 9 /* 10 * Linux x86 zImage and bzImage loading 11 * 12 * based on the procdure described in 13 * linux/Documentation/i386/boot.txt 14 */ 15 16 #include <common.h> 17 #include <asm/io.h> 18 #include <asm/ptrace.h> 19 #include <asm/zimage.h> 20 #include <asm/byteorder.h> 21 #include <asm/bootm.h> 22 #include <asm/bootparam.h> 23 #ifdef CONFIG_SYS_COREBOOT 24 #include <asm/arch/timestamp.h> 25 #endif 26 #include <linux/compiler.h> 27 28 DECLARE_GLOBAL_DATA_PTR; 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 /* 46 * Install a default e820 table with 3 entries as follows: 47 * 48 * 0x000000-0x0a0000 Useable RAM 49 * 0x0a0000-0x100000 Reserved for ISA 50 * 0x100000-gd->ram_size Useable RAM 51 */ 52 __weak unsigned install_e820_map(unsigned max_entries, 53 struct e820entry *entries) 54 { 55 entries[0].addr = 0; 56 entries[0].size = ISA_START_ADDRESS; 57 entries[0].type = E820_RAM; 58 entries[1].addr = ISA_START_ADDRESS; 59 entries[1].size = ISA_END_ADDRESS - ISA_START_ADDRESS; 60 entries[1].type = E820_RESERVED; 61 entries[2].addr = ISA_END_ADDRESS; 62 entries[2].size = gd->ram_size - ISA_END_ADDRESS; 63 entries[2].type = E820_RAM; 64 65 return 3; 66 } 67 68 static void build_command_line(char *command_line, int auto_boot) 69 { 70 char *env_command_line; 71 72 command_line[0] = '\0'; 73 74 env_command_line = getenv("bootargs"); 75 76 /* set console= argument if we use a serial console */ 77 if (!strstr(env_command_line, "console=")) { 78 if (!strcmp(getenv("stdout"), "serial")) { 79 80 /* We seem to use serial console */ 81 sprintf(command_line, "console=ttyS0,%s ", 82 getenv("baudrate")); 83 } 84 } 85 86 if (auto_boot) 87 strcat(command_line, "auto "); 88 89 if (env_command_line) 90 strcat(command_line, env_command_line); 91 92 printf("Kernel command line: \"%s\"\n", command_line); 93 } 94 95 static int kernel_magic_ok(struct setup_header *hdr) 96 { 97 if (KERNEL_MAGIC != hdr->boot_flag) { 98 printf("Error: Invalid Boot Flag " 99 "(found 0x%04x, expected 0x%04x)\n", 100 hdr->boot_flag, KERNEL_MAGIC); 101 return 0; 102 } else { 103 printf("Valid Boot Flag\n"); 104 return 1; 105 } 106 } 107 108 static int get_boot_protocol(struct setup_header *hdr) 109 { 110 if (hdr->header == KERNEL_V2_MAGIC) { 111 printf("Magic signature found\n"); 112 return hdr->version; 113 } else { 114 /* Very old kernel */ 115 printf("Magic signature not found\n"); 116 return 0x0100; 117 } 118 } 119 120 struct boot_params *load_zimage(char *image, unsigned long kernel_size, 121 ulong *load_addressp) 122 { 123 struct boot_params *setup_base; 124 int setup_size; 125 int bootproto; 126 int big_image; 127 128 struct boot_params *params = (struct boot_params *)image; 129 struct setup_header *hdr = ¶ms->hdr; 130 131 /* base address for real-mode segment */ 132 setup_base = (struct boot_params *)DEFAULT_SETUP_BASE; 133 134 if (!kernel_magic_ok(hdr)) 135 return 0; 136 137 /* determine size of setup */ 138 if (0 == hdr->setup_sects) { 139 printf("Setup Sectors = 0 (defaulting to 4)\n"); 140 setup_size = 5 * 512; 141 } else { 142 setup_size = (hdr->setup_sects + 1) * 512; 143 } 144 145 printf("Setup Size = 0x%8.8lx\n", (ulong)setup_size); 146 147 if (setup_size > SETUP_MAX_SIZE) 148 printf("Error: Setup is too large (%d bytes)\n", setup_size); 149 150 /* determine boot protocol version */ 151 bootproto = get_boot_protocol(hdr); 152 153 printf("Using boot protocol version %x.%02x\n", 154 (bootproto & 0xff00) >> 8, bootproto & 0xff); 155 156 if (bootproto >= 0x0200) { 157 if (hdr->setup_sects >= 15) { 158 printf("Linux kernel version %s\n", 159 (char *)params + 160 hdr->kernel_version + 0x200); 161 } else { 162 printf("Setup Sectors < 15 - " 163 "Cannot print kernel version.\n"); 164 } 165 } 166 167 /* Determine image type */ 168 big_image = (bootproto >= 0x0200) && 169 (hdr->loadflags & BIG_KERNEL_FLAG); 170 171 /* Determine load address */ 172 if (big_image) 173 *load_addressp = BZIMAGE_LOAD_ADDR; 174 else 175 *load_addressp = ZIMAGE_LOAD_ADDR; 176 177 printf("Building boot_params at 0x%8.8lx\n", (ulong)setup_base); 178 memset(setup_base, 0, sizeof(*setup_base)); 179 setup_base->hdr = params->hdr; 180 181 if (bootproto >= 0x0204) 182 kernel_size = hdr->syssize * 16; 183 else 184 kernel_size -= setup_size; 185 186 if (bootproto == 0x0100) { 187 /* 188 * A very old kernel MUST have its real-mode code 189 * loaded at 0x90000 190 */ 191 if ((u32)setup_base != 0x90000) { 192 /* Copy the real-mode kernel */ 193 memmove((void *)0x90000, setup_base, setup_size); 194 195 /* Copy the command line */ 196 memmove((void *)0x99000, 197 (u8 *)setup_base + COMMAND_LINE_OFFSET, 198 COMMAND_LINE_SIZE); 199 200 /* Relocated */ 201 setup_base = (struct boot_params *)0x90000; 202 } 203 204 /* It is recommended to clear memory up to the 32K mark */ 205 memset((u8 *)0x90000 + setup_size, 0, 206 SETUP_MAX_SIZE - setup_size); 207 } 208 209 if (big_image) { 210 if (kernel_size > BZIMAGE_MAX_SIZE) { 211 printf("Error: bzImage kernel too big! " 212 "(size: %ld, max: %d)\n", 213 kernel_size, BZIMAGE_MAX_SIZE); 214 return 0; 215 } 216 } else if ((kernel_size) > ZIMAGE_MAX_SIZE) { 217 printf("Error: zImage kernel too big! (size: %ld, max: %d)\n", 218 kernel_size, ZIMAGE_MAX_SIZE); 219 return 0; 220 } 221 222 printf("Loading %s at address %lx (%ld bytes)\n", 223 big_image ? "bzImage" : "zImage", *load_addressp, kernel_size); 224 225 memmove((void *)*load_addressp, image + setup_size, kernel_size); 226 227 return setup_base; 228 } 229 230 int setup_zimage(struct boot_params *setup_base, char *cmd_line, int auto_boot, 231 unsigned long initrd_addr, unsigned long initrd_size) 232 { 233 struct setup_header *hdr = &setup_base->hdr; 234 int bootproto = get_boot_protocol(hdr); 235 236 setup_base->e820_entries = install_e820_map( 237 ARRAY_SIZE(setup_base->e820_map), setup_base->e820_map); 238 239 if (bootproto == 0x0100) { 240 setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC; 241 setup_base->screen_info.cl_offset = COMMAND_LINE_OFFSET; 242 } 243 if (bootproto >= 0x0200) { 244 hdr->type_of_loader = 8; 245 246 if (initrd_addr) { 247 printf("Initial RAM disk at linear address " 248 "0x%08lx, size %ld bytes\n", 249 initrd_addr, initrd_size); 250 251 hdr->ramdisk_image = initrd_addr; 252 hdr->ramdisk_size = initrd_size; 253 } 254 } 255 256 if (bootproto >= 0x0201) { 257 hdr->heap_end_ptr = HEAP_END_OFFSET; 258 hdr->loadflags |= HEAP_FLAG; 259 } 260 261 if (cmd_line) { 262 if (bootproto >= 0x0202) { 263 hdr->cmd_line_ptr = (uintptr_t)cmd_line; 264 } else if (bootproto >= 0x0200) { 265 setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC; 266 setup_base->screen_info.cl_offset = 267 (uintptr_t)cmd_line - (uintptr_t)setup_base; 268 269 hdr->setup_move_size = 0x9100; 270 } 271 272 /* build command line at COMMAND_LINE_OFFSET */ 273 build_command_line(cmd_line, auto_boot); 274 } 275 276 return 0; 277 } 278 279 void setup_pcat_compatibility(void) 280 __attribute__((weak, alias("__setup_pcat_compatibility"))); 281 282 void __setup_pcat_compatibility(void) 283 { 284 } 285 286 int do_zboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[]) 287 { 288 struct boot_params *base_ptr; 289 void *bzImage_addr = NULL; 290 ulong load_address; 291 char *s; 292 ulong bzImage_size = 0; 293 ulong initrd_addr = 0; 294 ulong initrd_size = 0; 295 296 disable_interrupts(); 297 298 /* Setup board for maximum PC/AT Compatibility */ 299 setup_pcat_compatibility(); 300 301 if (argc >= 2) { 302 /* argv[1] holds the address of the bzImage */ 303 s = argv[1]; 304 } else { 305 s = getenv("fileaddr"); 306 } 307 308 if (s) 309 bzImage_addr = (void *)simple_strtoul(s, NULL, 16); 310 311 if (argc >= 3) { 312 /* argv[2] holds the size of the bzImage */ 313 bzImage_size = simple_strtoul(argv[2], NULL, 16); 314 } 315 316 if (argc >= 4) 317 initrd_addr = simple_strtoul(argv[3], NULL, 16); 318 if (argc >= 5) 319 initrd_size = simple_strtoul(argv[4], NULL, 16); 320 321 /* Lets look for */ 322 base_ptr = load_zimage(bzImage_addr, bzImage_size, &load_address); 323 324 if (!base_ptr) { 325 puts("## Kernel loading failed ...\n"); 326 return -1; 327 } 328 if (setup_zimage(base_ptr, (char *)base_ptr + COMMAND_LINE_OFFSET, 329 0, initrd_addr, initrd_size)) { 330 puts("Setting up boot parameters failed ...\n"); 331 return -1; 332 } 333 334 /* we assume that the kernel is in place */ 335 return boot_linux_kernel((ulong)base_ptr, load_address, false); 336 } 337 338 U_BOOT_CMD( 339 zboot, 5, 0, do_zboot, 340 "Boot bzImage", 341 "[addr] [size] [initrd addr] [initrd size]\n" 342 " addr - The optional starting address of the bzimage.\n" 343 " If not set it defaults to the environment\n" 344 " variable \"fileaddr\".\n" 345 " size - The optional size of the bzimage. Defaults to\n" 346 " zero.\n" 347 " initrd addr - The address of the initrd image to use, if any.\n" 348 " initrd size - The size of the initrd image to use, if any.\n" 349 ); 350