arch/x86/lib/zimage.c

   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 = &params->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 );