hw/arm_boot.c

   1 /*
   2  * ARM kernel loader.
   3  *
   4  * Copyright (c) 2006-2007 CodeSourcery.
   5  * Written by Paul Brook
   6  *
   7  * This code is licensed under the GPL.
   8  */
   9
  10 #include "hw.h"
  11 #include "arm-misc.h"
  12 #include "sysemu.h"
  13 #include "loader.h"
  14 #include "elf.h"
  15
  16 #define KERNEL_ARGS_ADDR 0x100
  17 #define KERNEL_LOAD_ADDR 0x00010000
  18 #define INITRD_LOAD_ADDR 0x00d00000
  19
  20 /* The worlds second smallest bootloader.  Set r0-r2, then jump to kernel.  */
  21 static uint32_t bootloader[] = {
  22   0xe3a00000, /* mov     r0, #0 */
  23   0xe59f1004, /* ldr     r1, [pc, #4] */
  24   0xe59f2004, /* ldr     r2, [pc, #4] */
  25   0xe59ff004, /* ldr     pc, [pc, #4] */
  26   0, /* Board ID */
  27   0, /* Address of kernel args.  Set by integratorcp_init.  */
  28   0  /* Kernel entry point.  Set by integratorcp_init.  */
  29 };
  30
  31 /* Handling for secondary CPU boot in a multicore system.
  32  * Unlike the uniprocessor/primary CPU boot, this is platform
  33  * dependent. The default code here is based on the secondary
  34  * CPU boot protocol used on realview/vexpress boards, with
  35  * some parameterisation to increase its flexibility.
  36  * QEMU platform models for which this code is not appropriate
  37  * should override write_secondary_boot and secondary_cpu_reset_hook
  38  * instead.
  39  *
  40  * This code enables the interrupt controllers for the secondary
  41  * CPUs and then puts all the secondary CPUs into a loop waiting
  42  * for an interprocessor interrupt and polling a configurable
  43  * location for the kernel secondary CPU entry point.
  44  */
  45 static uint32_t smpboot[] = {
  46   0xe59f201c, /* ldr r2, privbase */
  47   0xe59f001c, /* ldr r0, startaddr */
  48   0xe3a01001, /* mov r1, #1 */
  49   0xe5821100, /* str r1, [r2, #256] */
  50   0xe320f003, /* wfi */
  51   0xe5901000, /* ldr     r1, [r0] */
  52   0xe1110001, /* tst     r1, r1 */
  53   0x0afffffb, /* beq     <wfi> */
  54   0xe12fff11, /* bx      r1 */
  55   0,          /* privbase: Private memory region base address.  */
  56   0           /* bootreg: Boot register address is held here */
  57 };
  58
  59 static void default_write_secondary(CPUState *env,
  60                                     const struct arm_boot_info *info)
  61 {
  62     int n;
  63     smpboot[ARRAY_SIZE(smpboot) - 1] = info->smp_bootreg_addr;
  64     smpboot[ARRAY_SIZE(smpboot) - 2] = info->smp_priv_base;
  65     for (n = 0; n < ARRAY_SIZE(smpboot); n++) {
  66         smpboot[n] = tswap32(smpboot[n]);
  67     }
  68     rom_add_blob_fixed("smpboot", smpboot, sizeof(smpboot),
  69                        info->smp_loader_start);
  70 }
  71
  72 static void default_reset_secondary(CPUState *env,
  73                                     const struct arm_boot_info *info)
  74 {
  75     stl_phys_notdirty(info->smp_bootreg_addr, 0);
  76     env->regs[15] = info->smp_loader_start;
  77 }
  78
  79 #define WRITE_WORD(p, value) do { \
  80     stl_phys_notdirty(p, value);  \
  81     p += 4;                       \
  82 } while (0)
  83
  84 static void set_kernel_args(const struct arm_boot_info *info,
  85                 int initrd_size, target_phys_addr_t base)
  86 {
  87     target_phys_addr_t p;
  88
  89     p = base + KERNEL_ARGS_ADDR;
  90     /* ATAG_CORE */
  91     WRITE_WORD(p, 5);
  92     WRITE_WORD(p, 0x54410001);
  93     WRITE_WORD(p, 1);
  94     WRITE_WORD(p, 0x1000);
  95     WRITE_WORD(p, 0);
  96     /* ATAG_MEM */
  97     /* TODO: handle multiple chips on one ATAG list */
  98     WRITE_WORD(p, 4);
  99     WRITE_WORD(p, 0x54410002);
 100     WRITE_WORD(p, info->ram_size);
 101     WRITE_WORD(p, info->loader_start);
 102     if (initrd_size) {
 103         /* ATAG_INITRD2 */
 104         WRITE_WORD(p, 4);
 105         WRITE_WORD(p, 0x54420005);
 106         WRITE_WORD(p, info->loader_start + INITRD_LOAD_ADDR);
 107         WRITE_WORD(p, initrd_size);
 108     }
 109     if (info->kernel_cmdline && *info->kernel_cmdline) {
 110         /* ATAG_CMDLINE */
 111         int cmdline_size;
 112
 113         cmdline_size = strlen(info->kernel_cmdline);
 114         cpu_physical_memory_write(p + 8, (void *)info->kernel_cmdline,
 115                                   cmdline_size + 1);
 116         cmdline_size = (cmdline_size >> 2) + 1;
 117         WRITE_WORD(p, cmdline_size + 2);
 118         WRITE_WORD(p, 0x54410009);
 119         p += cmdline_size * 4;
 120     }
 121     if (info->atag_board) {
 122         /* ATAG_BOARD */
 123         int atag_board_len;
 124         uint8_t atag_board_buf[0x1000];
 125
 126         atag_board_len = (info->atag_board(info, atag_board_buf) + 3) & ~3;
 127         WRITE_WORD(p, (atag_board_len + 8) >> 2);
 128         WRITE_WORD(p, 0x414f4d50);
 129         cpu_physical_memory_write(p, atag_board_buf, atag_board_len);
 130         p += atag_board_len;
 131     }
 132     /* ATAG_END */
 133     WRITE_WORD(p, 0);
 134     WRITE_WORD(p, 0);
 135 }
 136
 137 static void set_kernel_args_old(const struct arm_boot_info *info,
 138                 int initrd_size, target_phys_addr_t base)
 139 {
 140     target_phys_addr_t p;
 141     const char *s;
 142
 143
 144     /* see linux/include/asm-arm/setup.h */
 145     p = base + KERNEL_ARGS_ADDR;
 146     /* page_size */
 147     WRITE_WORD(p, 4096);
 148     /* nr_pages */
 149     WRITE_WORD(p, info->ram_size / 4096);
 150     /* ramdisk_size */
 151     WRITE_WORD(p, 0);
 152 #define FLAG_READONLY   1
 153 #define FLAG_RDLOAD     4
 154 #define FLAG_RDPROMPT   8
 155     /* flags */
 156     WRITE_WORD(p, FLAG_READONLY | FLAG_RDLOAD | FLAG_RDPROMPT);
 157     /* rootdev */
 158     WRITE_WORD(p, (31 << 8) | 0);       /* /dev/mtdblock0 */
 159     /* video_num_cols */
 160     WRITE_WORD(p, 0);
 161     /* video_num_rows */
 162     WRITE_WORD(p, 0);
 163     /* video_x */
 164     WRITE_WORD(p, 0);
 165     /* video_y */
 166     WRITE_WORD(p, 0);
 167     /* memc_control_reg */
 168     WRITE_WORD(p, 0);
 169     /* unsigned char sounddefault */
 170     /* unsigned char adfsdrives */
 171     /* unsigned char bytes_per_char_h */
 172     /* unsigned char bytes_per_char_v */
 173     WRITE_WORD(p, 0);
 174     /* pages_in_bank[4] */
 175     WRITE_WORD(p, 0);
 176     WRITE_WORD(p, 0);
 177     WRITE_WORD(p, 0);
 178     WRITE_WORD(p, 0);
 179     /* pages_in_vram */
 180     WRITE_WORD(p, 0);
 181     /* initrd_start */
 182     if (initrd_size)
 183         WRITE_WORD(p, info->loader_start + INITRD_LOAD_ADDR);
 184     else
 185         WRITE_WORD(p, 0);
 186     /* initrd_size */
 187     WRITE_WORD(p, initrd_size);
 188     /* rd_start */
 189     WRITE_WORD(p, 0);
 190     /* system_rev */
 191     WRITE_WORD(p, 0);
 192     /* system_serial_low */
 193     WRITE_WORD(p, 0);
 194     /* system_serial_high */
 195     WRITE_WORD(p, 0);
 196     /* mem_fclk_21285 */
 197     WRITE_WORD(p, 0);
 198     /* zero unused fields */
 199     while (p < base + KERNEL_ARGS_ADDR + 256 + 1024) {
 200         WRITE_WORD(p, 0);
 201     }
 202     s = info->kernel_cmdline;
 203     if (s) {
 204         cpu_physical_memory_write(p, (void *)s, strlen(s) + 1);
 205     } else {
 206         WRITE_WORD(p, 0);
 207     }
 208 }
 209
 210 static void do_cpu_reset(void *opaque)
 211 {
 212     CPUState *env = opaque;
 213     const struct arm_boot_info *info = env->boot_info;
 214
 215     cpu_reset(env);
 216     if (info) {
 217         if (!info->is_linux) {
 218             /* Jump to the entry point.  */
 219             env->regs[15] = info->entry & 0xfffffffe;
 220             env->thumb = info->entry & 1;
 221         } else {
 222             if (env == first_cpu) {
 223                 env->regs[15] = info->loader_start;
 224                 if (old_param) {
 225                     set_kernel_args_old(info, info->initrd_size,
 226                                         info->loader_start);
 227                 } else {
 228                     set_kernel_args(info, info->initrd_size,
 229                                     info->loader_start);
 230                 }
 231             } else {
 232                 info->secondary_cpu_reset_hook(env, info);
 233             }
 234         }
 235     }
 236 }
 237
 238 void arm_load_kernel(CPUState *env, struct arm_boot_info *info)
 239 {
 240     int kernel_size;
 241     int initrd_size;
 242     int n;
 243     int is_linux = 0;
 244     uint64_t elf_entry;
 245     target_phys_addr_t entry;
 246     int big_endian;
 247
 248     /* Load the kernel.  */
 249     if (!info->kernel_filename) {
 250         fprintf(stderr, "Kernel image must be specified\n");
 251         exit(1);
 252     }
 253
 254     if (!info->secondary_cpu_reset_hook) {
 255         info->secondary_cpu_reset_hook = default_reset_secondary;
 256     }
 257     if (!info->write_secondary_boot) {
 258         info->write_secondary_boot = default_write_secondary;
 259     }
 260
 261     if (info->nb_cpus == 0)
 262         info->nb_cpus = 1;
 263
 264 #ifdef TARGET_WORDS_BIGENDIAN
 265     big_endian = 1;
 266 #else
 267     big_endian = 0;
 268 #endif
 269
 270     /* Assume that raw images are linux kernels, and ELF images are not.  */
 271     kernel_size = load_elf(info->kernel_filename, NULL, NULL, &elf_entry,
 272                            NULL, NULL, big_endian, ELF_MACHINE, 1);
 273     entry = elf_entry;
 274     if (kernel_size < 0) {
 275         kernel_size = load_uimage(info->kernel_filename, &entry, NULL,
 276                                   &is_linux);
 277     }
 278     if (kernel_size < 0) {
 279         entry = info->loader_start + KERNEL_LOAD_ADDR;
 280         kernel_size = load_image_targphys(info->kernel_filename, entry,
 281                                           ram_size - KERNEL_LOAD_ADDR);
 282         is_linux = 1;
 283     }
 284     if (kernel_size < 0) {
 285         fprintf(stderr, "qemu: could not load kernel '%s'\n",
 286                 info->kernel_filename);
 287         exit(1);
 288     }
 289     info->entry = entry;
 290     if (is_linux) {
 291         if (info->initrd_filename) {
 292             initrd_size = load_image_targphys(info->initrd_filename,
 293                                               info->loader_start
 294                                               + INITRD_LOAD_ADDR,
 295                                               ram_size - INITRD_LOAD_ADDR);
 296             if (initrd_size < 0) {
 297                 fprintf(stderr, "qemu: could not load initrd '%s'\n",
 298                         info->initrd_filename);
 299                 exit(1);
 300             }
 301         } else {
 302             initrd_size = 0;
 303         }
 304         bootloader[4] = info->board_id;
 305         bootloader[5] = info->loader_start + KERNEL_ARGS_ADDR;
 306         bootloader[6] = entry;
 307         for (n = 0; n < sizeof(bootloader) / 4; n++) {
 308             bootloader[n] = tswap32(bootloader[n]);
 309         }
 310         rom_add_blob_fixed("bootloader", bootloader, sizeof(bootloader),
 311                            info->loader_start);
 312         if (info->nb_cpus > 1) {
 313             info->write_secondary_boot(env, info);
 314         }
 315         info->initrd_size = initrd_size;
 316     }
 317     info->is_linux = is_linux;
 318
 319     for (; env; env = env->next_cpu) {
 320         env->boot_info = info;
 321         qemu_register_reset(do_cpu_reset, env);
 322     }
 323 }