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