git.sur5r.net Git - u-boot/blob - 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, <daniel@omicron.se>
   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 <malloc.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 #include <linux/libfdt.h>
  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 =  env_get("bootargs");
  52
  53         /* set console= argument if we use a serial console */
  54         if (!strstr(env_command_line, "console=")) {
  55                 if (!strcmp(env_get("stdout"), "serial")) {
  56
  57                         /* We seem to use serial console */
  58                         sprintf(command_line, "console=ttyS0,%s ",
  59                                 env_get("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 static int setup_device_tree(struct setup_header *hdr, const void *fdt_blob)
  98 {
  99         int bootproto = get_boot_protocol(hdr);
 100         struct setup_data *sd;
 101         int size;
 102
 103         if (bootproto < 0x0209)
 104                 return -ENOTSUPP;
 105
 106         if (!fdt_blob)
 107                 return 0;
 108
 109         size = fdt_totalsize(fdt_blob);
 110         if (size < 0)
 111                 return -EINVAL;
 112
 113         size += sizeof(struct setup_data);
 114         sd = (struct setup_data *)malloc(size);
 115         if (!sd) {
 116                 printf("Not enough memory for DTB setup data\n");
 117                 return -ENOMEM;
 118         }
 119
 120         sd->next = hdr->setup_data;
 121         sd->type = SETUP_DTB;
 122         sd->len = fdt_totalsize(fdt_blob);
 123         memcpy(sd->data, fdt_blob, sd->len);
 124         hdr->setup_data = (unsigned long)sd;
 125
 126         return 0;
 127 }
 128
 129 struct boot_params *load_zimage(char *image, unsigned long kernel_size,
 130                                 ulong *load_addressp)
 131 {
 132         struct boot_params *setup_base;
 133         int setup_size;
 134         int bootproto;
 135         int big_image;
 136
 137         struct boot_params *params = (struct boot_params *)image;
 138         struct setup_header *hdr = &params->hdr;
 139
 140         /* base address for real-mode segment */
 141         setup_base = (struct boot_params *)DEFAULT_SETUP_BASE;
 142
 143         if (!kernel_magic_ok(hdr))
 144                 return 0;
 145
 146         /* determine size of setup */
 147         if (0 == hdr->setup_sects) {
 148                 printf("Setup Sectors = 0 (defaulting to 4)\n");
 149                 setup_size = 5 * 512;
 150         } else {
 151                 setup_size = (hdr->setup_sects + 1) * 512;
 152         }
 153
 154         printf("Setup Size = 0x%8.8lx\n", (ulong)setup_size);
 155
 156         if (setup_size > SETUP_MAX_SIZE)
 157                 printf("Error: Setup is too large (%d bytes)\n", setup_size);
 158
 159         /* determine boot protocol version */
 160         bootproto = get_boot_protocol(hdr);
 161
 162         printf("Using boot protocol version %x.%02x\n",
 163                (bootproto & 0xff00) >> 8, bootproto & 0xff);
 164
 165         if (bootproto >= 0x0200) {
 166                 if (hdr->setup_sects >= 15) {
 167                         printf("Linux kernel version %s\n",
 168                                 (char *)params +
 169                                 hdr->kernel_version + 0x200);
 170                 } else {
 171                         printf("Setup Sectors < 15 - "
 172                                 "Cannot print kernel version.\n");
 173                 }
 174         }
 175
 176         /* Determine image type */
 177         big_image = (bootproto >= 0x0200) &&
 178                     (hdr->loadflags & BIG_KERNEL_FLAG);
 179
 180         /* Determine load address */
 181         if (big_image)
 182                 *load_addressp = BZIMAGE_LOAD_ADDR;
 183         else
 184                 *load_addressp = ZIMAGE_LOAD_ADDR;
 185
 186         printf("Building boot_params at 0x%8.8lx\n", (ulong)setup_base);
 187         memset(setup_base, 0, sizeof(*setup_base));
 188         setup_base->hdr = params->hdr;
 189
 190         if (bootproto >= 0x0204)
 191                 kernel_size = hdr->syssize * 16;
 192         else
 193                 kernel_size -= setup_size;
 194
 195         if (bootproto == 0x0100) {
 196                 /*
 197                  * A very old kernel MUST have its real-mode code
 198                  * loaded at 0x90000
 199                  */
 200                 if ((ulong)setup_base != 0x90000) {
 201                         /* Copy the real-mode kernel */
 202                         memmove((void *)0x90000, setup_base, setup_size);
 203
 204                         /* Copy the command line */
 205                         memmove((void *)0x99000,
 206                                 (u8 *)setup_base + COMMAND_LINE_OFFSET,
 207                                 COMMAND_LINE_SIZE);
 208
 209                          /* Relocated */
 210                         setup_base = (struct boot_params *)0x90000;
 211                 }
 212
 213                 /* It is recommended to clear memory up to the 32K mark */
 214                 memset((u8 *)0x90000 + setup_size, 0,
 215                        SETUP_MAX_SIZE - setup_size);
 216         }
 217
 218         if (big_image) {
 219                 if (kernel_size > BZIMAGE_MAX_SIZE) {
 220                         printf("Error: bzImage kernel too big! "
 221                                 "(size: %ld, max: %d)\n",
 222                                 kernel_size, BZIMAGE_MAX_SIZE);
 223                         return 0;
 224                 }
 225         } else if ((kernel_size) > ZIMAGE_MAX_SIZE) {
 226                 printf("Error: zImage kernel too big! (size: %ld, max: %d)\n",
 227                        kernel_size, ZIMAGE_MAX_SIZE);
 228                 return 0;
 229         }
 230
 231         printf("Loading %s at address %lx (%ld bytes)\n",
 232                big_image ? "bzImage" : "zImage", *load_addressp, kernel_size);
 233
 234         memmove((void *)*load_addressp, image + setup_size, kernel_size);
 235
 236         return setup_base;
 237 }
 238
 239 int setup_zimage(struct boot_params *setup_base, char *cmd_line, int auto_boot,
 240                  unsigned long initrd_addr, unsigned long initrd_size)
 241 {
 242         struct setup_header *hdr = &setup_base->hdr;
 243         int bootproto = get_boot_protocol(hdr);
 244
 245         setup_base->e820_entries = install_e820_map(
 246                 ARRAY_SIZE(setup_base->e820_map), setup_base->e820_map);
 247
 248         if (bootproto == 0x0100) {
 249                 setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
 250                 setup_base->screen_info.cl_offset = COMMAND_LINE_OFFSET;
 251         }
 252         if (bootproto >= 0x0200) {
 253                 hdr->type_of_loader = 8;
 254
 255                 if (initrd_addr) {
 256                         printf("Initial RAM disk at linear address "
 257                                "0x%08lx, size %ld bytes\n",
 258                                initrd_addr, initrd_size);
 259
 260                         hdr->ramdisk_image = initrd_addr;
 261                         hdr->ramdisk_size = initrd_size;
 262                 }
 263         }
 264
 265         if (bootproto >= 0x0201) {
 266                 hdr->heap_end_ptr = HEAP_END_OFFSET;
 267                 hdr->loadflags |= HEAP_FLAG;
 268         }
 269
 270         if (cmd_line) {
 271                 if (bootproto >= 0x0202) {
 272                         hdr->cmd_line_ptr = (uintptr_t)cmd_line;
 273                 } else if (bootproto >= 0x0200) {
 274                         setup_base->screen_info.cl_magic = COMMAND_LINE_MAGIC;
 275                         setup_base->screen_info.cl_offset =
 276                                 (uintptr_t)cmd_line - (uintptr_t)setup_base;
 277
 278                         hdr->setup_move_size = 0x9100;
 279                 }
 280
 281                 /* build command line at COMMAND_LINE_OFFSET */
 282                 build_command_line(cmd_line, auto_boot);
 283         }
 284
 285 #ifdef CONFIG_INTEL_MID
 286         if (bootproto >= 0x0207)
 287                 hdr->hardware_subarch = X86_SUBARCH_INTEL_MID;
 288 #endif
 289
 290 #ifdef CONFIG_GENERATE_ACPI_TABLE
 291         if (bootproto >= 0x020e)
 292                 hdr->acpi_rsdp_addr = acpi_get_rsdp_addr();
 293 #endif
 294
 295         setup_device_tree(hdr, (const void *)env_get_hex("fdtaddr", 0));
 296         setup_video(&setup_base->screen_info);
 297
 298         return 0;
 299 }
 300
 301 void setup_pcat_compatibility(void)
 302         __attribute__((weak, alias("__setup_pcat_compatibility")));
 303
 304 void __setup_pcat_compatibility(void)
 305 {
 306 }
 307
 308 int do_zboot(cmd_tbl_t *cmdtp, int flag, int argc, char *const argv[])
 309 {
 310         struct boot_params *base_ptr;
 311         void *bzImage_addr = NULL;
 312         ulong load_address;
 313         char *s;
 314         ulong bzImage_size = 0;
 315         ulong initrd_addr = 0;
 316         ulong initrd_size = 0;
 317
 318         disable_interrupts();
 319
 320         /* Setup board for maximum PC/AT Compatibility */
 321         setup_pcat_compatibility();
 322
 323         if (argc >= 2) {
 324                 /* argv[1] holds the address of the bzImage */
 325                 s = argv[1];
 326         } else {
 327                 s = env_get("fileaddr");
 328         }
 329
 330         if (s)
 331                 bzImage_addr = (void *)simple_strtoul(s, NULL, 16);
 332
 333         if (argc >= 3) {
 334                 /* argv[2] holds the size of the bzImage */
 335                 bzImage_size = simple_strtoul(argv[2], NULL, 16);
 336         }
 337
 338         if (argc >= 4)
 339                 initrd_addr = simple_strtoul(argv[3], NULL, 16);
 340         if (argc >= 5)
 341                 initrd_size = simple_strtoul(argv[4], NULL, 16);
 342
 343         /* Lets look for */
 344         base_ptr = load_zimage(bzImage_addr, bzImage_size, &load_address);
 345
 346         if (!base_ptr) {
 347                 puts("## Kernel loading failed ...\n");
 348                 return -1;
 349         }
 350         if (setup_zimage(base_ptr, (char *)base_ptr + COMMAND_LINE_OFFSET,
 351                         0, initrd_addr, initrd_size)) {
 352                 puts("Setting up boot parameters failed ...\n");
 353                 return -1;
 354         }
 355
 356         /* we assume that the kernel is in place */
 357         return boot_linux_kernel((ulong)base_ptr, load_address, false);
 358 }
 359
 360 U_BOOT_CMD(
 361         zboot, 5, 0,    do_zboot,
 362         "Boot bzImage",
 363         "[addr] [size] [initrd addr] [initrd size]\n"
 364         "      addr -        The optional starting address of the bzimage.\n"
 365         "                    If not set it defaults to the environment\n"
 366         "                    variable \"fileaddr\".\n"
 367         "      size -        The optional size of the bzimage. Defaults to\n"
 368         "                    zero.\n"
 369         "      initrd addr - The address of the initrd image to use, if any.\n"
 370         "      initrd size - The size of the initrd image to use, if any.\n"
 371 );