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