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 entries[3].addr = CONFIG_PCIE_ECAM_BASE; 65 entries[3].size = CONFIG_PCIE_ECAM_SIZE; 66 entries[3].type = E820_RESERVED; 67 68 return 4; 69 } 70 71 static void build_command_line(char *command_line, int auto_boot) 72 { 73 char *env_command_line; 74 75 command_line[0] = '\0'; 76 77 env_command_line = getenv("bootargs"); 78 79 /* set console= argument if we use a serial console */ 80 if (!strstr(env_command_line, "console=")) { 81 if (!strcmp(getenv("stdout"), "serial")) { 82 83 /* We seem to use serial console */ 84 sprintf(command_line, "console=ttyS0,%s ", 85 getenv("baudrate")); 86 } 87 } 88 89 if (auto_boot) 90 strcat(command_line, "auto "); 91 92 if (env_command_line) 93 strcat(command_line, env_command_line); 94 95 printf("Kernel command line: \"%s\"\n", command_line); 96 } 97 98 static int kernel_magic_ok(struct setup_header *hdr) 99 { 100 if (KERNEL_MAGIC != hdr->boot_flag) { 101 printf("Error: Invalid Boot Flag " 102 "(found 0x%04x, expected 0x%04x)\n", 103 hdr->boot_flag, KERNEL_MAGIC); 104 return 0; 105 } else { 106 printf("Valid Boot Flag\n"); 107 return 1; 108 } 109 } 110 111 static int get_boot_protocol(struct setup_header *hdr) 112 { 113 if (hdr->header == KERNEL_V2_MAGIC) { 114 printf("Magic signature found\n"); 115 return hdr->version; 116 } else { 117 /* Very old kernel */ 118 printf("Magic signature not found\n"); 119 return 0x0100; 120 } 121 } 122 123 struct boot_params *load_zimage(char *image, unsigned long kernel_size, 124 ulong *load_addressp) 125 { 126 struct boot_params *setup_base; 127 int setup_size; 128 int bootproto; 129 int big_image; 130 131 struct boot_params *params = (struct boot_params *)image; 132 struct setup_header *hdr = ¶ms->hdr; 133 134 /* base address for real-mode segment */ 135 setup_base = (struct boot_params *)DEFAULT_SETUP_BASE; 136 137 if (!kernel_magic_ok(hdr)) 138 return 0; 139 140 /* determine size of setup */ 141 if (0 == hdr->setup_sects) { 142 printf("Setup Sectors = 0 (defaulting to 4)\n"); 143 setup_size = 5 * 512; 144 } else { 145 setup_size = (hdr->setup_sects + 1) * 512; 146 } 147 148 printf("Setup Size = 0x%8.8lx\n", (ulong)setup_size); 149 150 if (setup_size > SETUP_MAX_SIZE) 151 printf("Error: Setup is too large (%d bytes)\n", setup_size); 152 153 /* determine boot protocol version */ 154 bootproto = get_boot_protocol(hdr); 155 156 printf("Using boot protocol version %x.%02x\n", 157 (bootproto & 0xff00) >> 8, bootproto & 0xff); 158 159 if (bootproto >= 0x0200) { 160 if (hdr->setup_sects >= 15) { 161 printf("Linux kernel version %s\n", 162 (char *)params + 163 hdr->kernel_version + 0x200); 164 } else { 165 printf("Setup Sectors < 15 - " 166 "Cannot print kernel version.\n"); 167 } 168 } 169 170 /* Determine image type */ 171 big_image = (bootproto >= 0x0200) && 172 (hdr->loadflags & BIG_KERNEL_FLAG); 173 174 /* Determine load address */ 175 if (big_image) 176 *load_addressp = BZIMAGE_LOAD_ADDR; 177 else 178 *load_addressp = ZIMAGE_LOAD_ADDR; 179 180 printf("Building boot_params at 0x%8.8lx\n", (ulong)setup_base); 181 memset(setup_base, 0, sizeof(*setup_base)); 182 setup_base->hdr = params->hdr; 183 184 if (bootproto >= 0x0204) 185 kernel_size = hdr->syssize * 16; 186 else 187 kernel_size -= setup_size; 188 189 if (bootproto == 0x0100) { 190 /* 191 * A very old kernel MUST have its real-mode code 192 * loaded at 0x90000 193 */ 194 if ((u32)setup_base != 0x90000) { 195 /* Copy the real-mode kernel */ 196 memmove((void *)0x90000, setup_base, setup_size); 197 198 /* Copy the command line */ 199 memmove((void *)0x99000, 200 (u8 *)setup_base + COMMAND_LINE_OFFSET, 201 COMMAND_LINE_SIZE); 202 203 /* Relocated */ 204 setup_base = (struct boot_params *)0x90000; 205 } 206 207 /* It is recommended to clear memory up to the 32K mark */ 208 memset((u8 *)0x90000 + setup_size, 0, 209 SETUP_MAX_SIZE - setup_size); 210 } 211 212 if (big_image) { 213 if (kernel_size > BZIMAGE_MAX_SIZE) { 214 printf("Error: bzImage kernel too big! " 215 "(size: %ld, max: %d)\n", 216 kernel_size, BZIMAGE_MAX_SIZE); 217 return 0; 218 } 219 } else if ((kernel_size) > ZIMAGE_MAX_SIZE) { 220 printf("Error: zImage kernel too big! (size: %ld, max: %d)\n", 221 kernel_size, ZIMAGE_MAX_SIZE); 222 return 0; 223 } 224 225 printf("Loading %s at address %lx (%ld bytes)\n", 226 big_image ? "bzImage" : "zImage", *load_addressp, kernel_size); 227 228 memmove((void *)*load_addressp, image + setup_size, kernel_size); 229 230 return setup_base; 231 } 232 233 int setup_zimage(struct boot_params *setup_base, char *cmd_line, int auto_boot, 234 unsigned long initrd_addr, unsigned long initrd_size) 235 { 236 struct setup_header *hdr = &setup_base->hdr; 237 int bootproto = get_boot_protocol(hdr); 238 239 setup_base->e820_entries = install_e820_map( 240 ARRAY_SIZE(setup_base->e820_map), setup_base->e820_map); 241 242 if (bootproto == 0x0100) { 243 setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC; 244 setup_base->screen_info.cl_offset = COMMAND_LINE_OFFSET; 245 } 246 if (bootproto >= 0x0200) { 247 hdr->type_of_loader = 8; 248 249 if (initrd_addr) { 250 printf("Initial RAM disk at linear address " 251 "0x%08lx, size %ld bytes\n", 252 initrd_addr, initrd_size); 253 254 hdr->ramdisk_image = initrd_addr; 255 hdr->ramdisk_size = initrd_size; 256 } 257 } 258 259 if (bootproto >= 0x0201) { 260 hdr->heap_end_ptr = HEAP_END_OFFSET; 261 hdr->loadflags |= HEAP_FLAG; 262 } 263 264 if (cmd_line) { 265 if (bootproto >= 0x0202) { 266 hdr->cmd_line_ptr = (uintptr_t)cmd_line; 267 } else if (bootproto >= 0x0200) { 268 setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC; 269 setup_base->screen_info.cl_offset = 270 (uintptr_t)cmd_line - (uintptr_t)setup_base; 271 272 hdr->setup_move_size = 0x9100; 273 } 274 275 /* build command line at COMMAND_LINE_OFFSET */ 276 build_command_line(cmd_line, auto_boot); 277 } 278 279 setup_video(&setup_base->screen_info); 280 281 return 0; 282 } 283 284 void setup_pcat_compatibility(void) 285 __attribute__((weak, alias("__setup_pcat_compatibility"))); 286 287 void __setup_pcat_compatibility(void) 288 { 289 } 290 291 int do_zboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[]) 292 { 293 struct boot_params *base_ptr; 294 void *bzImage_addr = NULL; 295 ulong load_address; 296 char *s; 297 ulong bzImage_size = 0; 298 ulong initrd_addr = 0; 299 ulong initrd_size = 0; 300 301 disable_interrupts(); 302 303 /* Setup board for maximum PC/AT Compatibility */ 304 setup_pcat_compatibility(); 305 306 if (argc >= 2) { 307 /* argv[1] holds the address of the bzImage */ 308 s = argv[1]; 309 } else { 310 s = getenv("fileaddr"); 311 } 312 313 if (s) 314 bzImage_addr = (void *)simple_strtoul(s, NULL, 16); 315 316 if (argc >= 3) { 317 /* argv[2] holds the size of the bzImage */ 318 bzImage_size = simple_strtoul(argv[2], NULL, 16); 319 } 320 321 if (argc >= 4) 322 initrd_addr = simple_strtoul(argv[3], NULL, 16); 323 if (argc >= 5) 324 initrd_size = simple_strtoul(argv[4], NULL, 16); 325 326 /* Lets look for */ 327 base_ptr = load_zimage(bzImage_addr, bzImage_size, &load_address); 328 329 if (!base_ptr) { 330 puts("## Kernel loading failed ...\n"); 331 return -1; 332 } 333 if (setup_zimage(base_ptr, (char *)base_ptr + COMMAND_LINE_OFFSET, 334 0, initrd_addr, initrd_size)) { 335 puts("Setting up boot parameters failed ...\n"); 336 return -1; 337 } 338 339 /* we assume that the kernel is in place */ 340 return boot_linux_kernel((ulong)base_ptr, load_address, false); 341 } 342 343 U_BOOT_CMD( 344 zboot, 5, 0, do_zboot, 345 "Boot bzImage", 346 "[addr] [size] [initrd addr] [initrd size]\n" 347 " addr - The optional starting address of the bzimage.\n" 348 " If not set it defaults to the environment\n" 349 " variable \"fileaddr\".\n" 350 " size - The optional size of the bzimage. Defaults to\n" 351 " zero.\n" 352 " initrd addr - The address of the initrd image to use, if any.\n" 353 " initrd size - The size of the initrd image to use, if any.\n" 354 ); 355