arch/x86/lib/zimage.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2011 The Chromium OS Authors.
   4  * (C) Copyright 2002
   5  * Daniel Engström, Omicron Ceti AB, <[email protected]>
   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 <command.h>
  17 #include <env.h>
  18 #include <irq_func.h>
  19 #include <malloc.h>
  20 #include <acpi/acpi_table.h>
  21 #include <asm/io.h>
  22 #include <asm/ptrace.h>
  23 #include <asm/zimage.h>
  24 #include <asm/byteorder.h>
  25 #include <asm/bootm.h>
  26 #include <asm/bootparam.h>
  27 #ifdef CONFIG_SYS_COREBOOT
  28 #include <asm/arch/timestamp.h>
  29 #endif
  30 #include <linux/compiler.h>
  31 #include <linux/libfdt.h>
  32
  33 /*
  34  * Memory lay-out:
  35  *
  36  * relative to setup_base (which is 0x90000 currently)
  37  *
  38  *      0x0000-0x7FFF   Real mode kernel
  39  *      0x8000-0x8FFF   Stack and heap
  40  *      0x9000-0x90FF   Kernel command line
  41  */
  42 #define DEFAULT_SETUP_BASE      0x90000
  43 #define COMMAND_LINE_OFFSET     0x9000
  44 #define HEAP_END_OFFSET         0x8e00
  45
  46 #define COMMAND_LINE_SIZE       2048
  47
  48 static void build_command_line(char *command_line, int auto_boot)
  49 {
  50         char *env_command_line;
  51
  52         command_line[0] = '\0';
  53
  54         env_command_line =  env_get("bootargs");
  55
  56         /* set console= argument if we use a serial console */
  57         if (!strstr(env_command_line, "console=")) {
  58                 if (!strcmp(env_get("stdout"), "serial")) {
  59
  60                         /* We seem to use serial console */
  61                         sprintf(command_line, "console=ttyS0,%s ",
  62                                 env_get("baudrate"));
  63                 }
  64         }
  65
  66         if (auto_boot)
  67                 strcat(command_line, "auto ");
  68
  69         if (env_command_line)
  70                 strcat(command_line, env_command_line);
  71
  72         printf("Kernel command line: \"%s\"\n", command_line);
  73 }
  74
  75 static int kernel_magic_ok(struct setup_header *hdr)
  76 {
  77         if (KERNEL_MAGIC != hdr->boot_flag) {
  78                 printf("Error: Invalid Boot Flag "
  79                         "(found 0x%04x, expected 0x%04x)\n",
  80                         hdr->boot_flag, KERNEL_MAGIC);
  81                 return 0;
  82         } else {
  83                 printf("Valid Boot Flag\n");
  84                 return 1;
  85         }
  86 }
  87
  88 static int get_boot_protocol(struct setup_header *hdr)
  89 {
  90         if (hdr->header == KERNEL_V2_MAGIC) {
  91                 printf("Magic signature found\n");
  92                 return hdr->version;
  93         } else {
  94                 /* Very old kernel */
  95                 printf("Magic signature not found\n");
  96                 return 0x0100;
  97         }
  98 }
  99
 100 static int setup_device_tree(struct setup_header *hdr, const void *fdt_blob)
 101 {
 102         int bootproto = get_boot_protocol(hdr);
 103         struct setup_data *sd;
 104         int size;
 105
 106         if (bootproto < 0x0209)
 107                 return -ENOTSUPP;
 108
 109         if (!fdt_blob)
 110                 return 0;
 111
 112         size = fdt_totalsize(fdt_blob);
 113         if (size < 0)
 114                 return -EINVAL;
 115
 116         size += sizeof(struct setup_data);
 117         sd = (struct setup_data *)malloc(size);
 118         if (!sd) {
 119                 printf("Not enough memory for DTB setup data\n");
 120                 return -ENOMEM;
 121         }
 122
 123         sd->next = hdr->setup_data;
 124         sd->type = SETUP_DTB;
 125         sd->len = fdt_totalsize(fdt_blob);
 126         memcpy(sd->data, fdt_blob, sd->len);
 127         hdr->setup_data = (unsigned long)sd;
 128
 129         return 0;
 130 }
 131
 132 struct boot_params *load_zimage(char *image, unsigned long kernel_size,
 133                                 ulong *load_addressp)
 134 {
 135         struct boot_params *setup_base;
 136         int setup_size;
 137         int bootproto;
 138         int big_image;
 139
 140         struct boot_params *params = (struct boot_params *)image;
 141         struct setup_header *hdr = &params->hdr;
 142
 143         /* base address for real-mode segment */
 144         setup_base = (struct boot_params *)DEFAULT_SETUP_BASE;
 145
 146         if (!kernel_magic_ok(hdr))
 147                 return 0;
 148
 149         /* determine size of setup */
 150         if (0 == hdr->setup_sects) {
 151                 printf("Setup Sectors = 0 (defaulting to 4)\n");
 152                 setup_size = 5 * 512;
 153         } else {
 154                 setup_size = (hdr->setup_sects + 1) * 512;
 155         }
 156
 157         printf("Setup Size = 0x%8.8lx\n", (ulong)setup_size);
 158
 159         if (setup_size > SETUP_MAX_SIZE)
 160                 printf("Error: Setup is too large (%d bytes)\n", setup_size);
 161
 162         /* determine boot protocol version */
 163         bootproto = get_boot_protocol(hdr);
 164
 165         printf("Using boot protocol version %x.%02x\n",
 166                (bootproto & 0xff00) >> 8, bootproto & 0xff);
 167
 168         if (bootproto >= 0x0200) {
 169                 if (hdr->setup_sects >= 15) {
 170                         printf("Linux kernel version %s\n",
 171                                 (char *)params +
 172                                 hdr->kernel_version + 0x200);
 173                 } else {
 174                         printf("Setup Sectors < 15 - "
 175                                 "Cannot print kernel version.\n");
 176                 }
 177         }
 178
 179         /* Determine image type */
 180         big_image = (bootproto >= 0x0200) &&
 181                     (hdr->loadflags & BIG_KERNEL_FLAG);
 182
 183         /* Determine load address */
 184         if (big_image)
 185                 *load_addressp = BZIMAGE_LOAD_ADDR;
 186         else
 187                 *load_addressp = ZIMAGE_LOAD_ADDR;
 188
 189         printf("Building boot_params at 0x%8.8lx\n", (ulong)setup_base);
 190         memset(setup_base, 0, sizeof(*setup_base));
 191         setup_base->hdr = params->hdr;
 192
 193         if (bootproto >= 0x0204)
 194                 kernel_size = hdr->syssize * 16;
 195         else
 196                 kernel_size -= setup_size;
 197
 198         if (bootproto == 0x0100) {
 199                 /*
 200                  * A very old kernel MUST have its real-mode code
 201                  * loaded at 0x90000
 202                  */
 203                 if ((ulong)setup_base != 0x90000) {
 204                         /* Copy the real-mode kernel */
 205                         memmove((void *)0x90000, setup_base, setup_size);
 206
 207                         /* Copy the command line */
 208                         memmove((void *)0x99000,
 209                                 (u8 *)setup_base + COMMAND_LINE_OFFSET,
 210                                 COMMAND_LINE_SIZE);
 211
 212                          /* Relocated */
 213                         setup_base = (struct boot_params *)0x90000;
 214                 }
 215
 216                 /* It is recommended to clear memory up to the 32K mark */
 217                 memset((u8 *)0x90000 + setup_size, 0,
 218                        SETUP_MAX_SIZE - setup_size);
 219         }
 220
 221         if (big_image) {
 222                 if (kernel_size > BZIMAGE_MAX_SIZE) {
 223                         printf("Error: bzImage kernel too big! "
 224                                 "(size: %ld, max: %d)\n",
 225                                 kernel_size, BZIMAGE_MAX_SIZE);
 226                         return 0;
 227                 }
 228         } else if ((kernel_size) > ZIMAGE_MAX_SIZE) {
 229                 printf("Error: zImage kernel too big! (size: %ld, max: %d)\n",
 230                        kernel_size, ZIMAGE_MAX_SIZE);
 231                 return 0;
 232         }
 233
 234         printf("Loading %s at address %lx (%ld bytes)\n",
 235                big_image ? "bzImage" : "zImage", *load_addressp, kernel_size);
 236
 237         memmove((void *)*load_addressp, image + setup_size, kernel_size);
 238
 239         return setup_base;
 240 }
 241
 242 int setup_zimage(struct boot_params *setup_base, char *cmd_line, int auto_boot,
 243                  unsigned long initrd_addr, unsigned long initrd_size)
 244 {
 245         struct setup_header *hdr = &setup_base->hdr;
 246         int bootproto = get_boot_protocol(hdr);
 247
 248         setup_base->e820_entries = install_e820_map(
 249                 ARRAY_SIZE(setup_base->e820_map), setup_base->e820_map);
 250
 251         if (bootproto == 0x0100) {
 252                 setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
 253                 setup_base->screen_info.cl_offset = COMMAND_LINE_OFFSET;
 254         }
 255         if (bootproto >= 0x0200) {
 256                 hdr->type_of_loader = 8;
 257
 258                 if (initrd_addr) {
 259                         printf("Initial RAM disk at linear address "
 260                                "0x%08lx, size %ld bytes\n",
 261                                initrd_addr, initrd_size);
 262
 263                         hdr->ramdisk_image = initrd_addr;
 264                         hdr->ramdisk_size = initrd_size;
 265                 }
 266         }
 267
 268         if (bootproto >= 0x0201) {
 269                 hdr->heap_end_ptr = HEAP_END_OFFSET;
 270                 hdr->loadflags |= HEAP_FLAG;
 271         }
 272
 273         if (cmd_line) {
 274                 if (bootproto >= 0x0202) {
 275                         hdr->cmd_line_ptr = (uintptr_t)cmd_line;
 276                 } else if (bootproto >= 0x0200) {
 277                         setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
 278                         setup_base->screen_info.cl_offset =
 279                                 (uintptr_t)cmd_line - (uintptr_t)setup_base;
 280
 281                         hdr->setup_move_size = 0x9100;
 282                 }
 283
 284                 /* build command line at COMMAND_LINE_OFFSET */
 285                 build_command_line(cmd_line, auto_boot);
 286         }
 287
 288 #ifdef CONFIG_INTEL_MID
 289         if (bootproto >= 0x0207)
 290                 hdr->hardware_subarch = X86_SUBARCH_INTEL_MID;
 291 #endif
 292
 293 #ifdef CONFIG_GENERATE_ACPI_TABLE
 294         setup_base->acpi_rsdp_addr = acpi_get_rsdp_addr();
 295 #endif
 296
 297         setup_device_tree(hdr, (const void *)env_get_hex("fdtaddr", 0));
 298         setup_video(&setup_base->screen_info);
 299
 300 #ifdef CONFIG_EFI_STUB
 301         setup_efi_info(&setup_base->efi_info);
 302 #endif
 303
 304         return 0;
 305 }
 306
 307 void setup_pcat_compatibility(void)
 308         __attribute__((weak, alias("__setup_pcat_compatibility")));
 309
 310 void __setup_pcat_compatibility(void)
 311 {
 312 }
 313
 314 int do_zboot(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
 315 {
 316         struct boot_params *base_ptr;
 317         void *bzImage_addr = NULL;
 318         ulong load_address;
 319         char *s;
 320         ulong bzImage_size = 0;
 321         ulong initrd_addr = 0;
 322         ulong initrd_size = 0;
 323
 324         disable_interrupts();
 325
 326         /* Setup board for maximum PC/AT Compatibility */
 327         setup_pcat_compatibility();
 328
 329         if (argc >= 2) {
 330                 /* argv[1] holds the address of the bzImage */
 331                 s = argv[1];
 332         } else {
 333                 s = env_get("fileaddr");
 334         }
 335
 336         if (s)
 337                 bzImage_addr = (void *)simple_strtoul(s, NULL, 16);
 338
 339         if (argc >= 3) {
 340                 /* argv[2] holds the size of the bzImage */
 341                 bzImage_size = simple_strtoul(argv[2], NULL, 16);
 342         }
 343
 344         if (argc >= 4)
 345                 initrd_addr = simple_strtoul(argv[3], NULL, 16);
 346         if (argc >= 5)
 347                 initrd_size = simple_strtoul(argv[4], NULL, 16);
 348
 349         /* Lets look for */
 350         base_ptr = load_zimage(bzImage_addr, bzImage_size, &load_address);
 351
 352         if (!base_ptr) {
 353                 puts("## Kernel loading failed ...\n");
 354                 return -1;
 355         }
 356         if (setup_zimage(base_ptr, (char *)base_ptr + COMMAND_LINE_OFFSET,
 357                         0, initrd_addr, initrd_size)) {
 358                 puts("Setting up boot parameters failed ...\n");
 359                 return -1;
 360         }
 361
 362         /* we assume that the kernel is in place */
 363         return boot_linux_kernel((ulong)base_ptr, load_address, false);
 364 }
 365
 366 U_BOOT_CMD(
 367         zboot, 5, 0,    do_zboot,
 368         "Boot bzImage",
 369         "[addr] [size] [initrd addr] [initrd size]\n"
 370         "      addr -        The optional starting address of the bzimage.\n"
 371         "                    If not set it defaults to the environment\n"
 372         "                    variable \"fileaddr\".\n"
 373         "      size -        The optional size of the bzimage. Defaults to\n"
 374         "                    zero.\n"
 375         "      initrd addr - The address of the initrd image to use, if any.\n"
 376         "      initrd size - The size of the initrd image to use, if any.\n"
 377 );