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, gic_cpu_if */
  47   0xe59f001c, /* ldr r0, startaddr */
  48   0xe3a01001, /* mov r1, #1 */
  49   0xe5821000, /* str r1, [r2] */
  50   0xe320f003, /* wfi */
  51   0xe5901000, /* ldr     r1, [r0] */
  52   0xe1110001, /* tst     r1, r1 */
  53   0x0afffffb, /* beq     <wfi> */
  54   0xe12fff11, /* bx      r1 */
  55   0,          /* gic_cpu_if: base address of GIC CPU interface */
  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->gic_cpu_if_addr;
  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 {
  86     int initrd_size = info->initrd_size;
  87     target_phys_addr_t base = info->loader_start;
  88     target_phys_addr_t p;
  89
  90     p = base + KERNEL_ARGS_ADDR;
  91     /* ATAG_CORE */
  92     WRITE_WORD(p, 5);
  93     WRITE_WORD(p, 0x54410001);
  94     WRITE_WORD(p, 1);
  95     WRITE_WORD(p, 0x1000);
  96     WRITE_WORD(p, 0);
  97     /* ATAG_MEM */
  98     /* TODO: handle multiple chips on one ATAG list */
  99     WRITE_WORD(p, 4);
 100     WRITE_WORD(p, 0x54410002);
 101     WRITE_WORD(p, info->ram_size);
 102     WRITE_WORD(p, info->loader_start);
 103     if (initrd_size) {
 104         /* ATAG_INITRD2 */
 105         WRITE_WORD(p, 4);
 106         WRITE_WORD(p, 0x54420005);
 107         WRITE_WORD(p, info->loader_start + INITRD_LOAD_ADDR);
 108         WRITE_WORD(p, initrd_size);
 109     }
 110     if (info->kernel_cmdline && *info->kernel_cmdline) {
 111         /* ATAG_CMDLINE */
 112         int cmdline_size;
 113
 114         cmdline_size = strlen(info->kernel_cmdline);
 115         cpu_physical_memory_write(p + 8, (void *)info->kernel_cmdline,
 116                                   cmdline_size + 1);
 117         cmdline_size = (cmdline_size >> 2) + 1;
 118         WRITE_WORD(p, cmdline_size + 2);
 119         WRITE_WORD(p, 0x54410009);
 120         p += cmdline_size * 4;
 121     }
 122     if (info->atag_board) {
 123         /* ATAG_BOARD */
 124         int atag_board_len;
 125         uint8_t atag_board_buf[0x1000];
 126
 127         atag_board_len = (info->atag_board(info, atag_board_buf) + 3) & ~3;
 128         WRITE_WORD(p, (atag_board_len + 8) >> 2);
 129         WRITE_WORD(p, 0x414f4d50);
 130         cpu_physical_memory_write(p, atag_board_buf, atag_board_len);
 131         p += atag_board_len;
 132     }
 133     /* ATAG_END */
 134     WRITE_WORD(p, 0);
 135     WRITE_WORD(p, 0);
 136 }
 137
 138 static void set_kernel_args_old(const struct arm_boot_info *info)
 139 {
 140     target_phys_addr_t p;
 141     const char *s;
 142     int initrd_size = info->initrd_size;
 143     target_phys_addr_t base = info->loader_start;
 144
 145     /* see linux/include/asm-arm/setup.h */
 146     p = base + KERNEL_ARGS_ADDR;
 147     /* page_size */
 148     WRITE_WORD(p, 4096);
 149     /* nr_pages */
 150     WRITE_WORD(p, info->ram_size / 4096);
 151     /* ramdisk_size */
 152     WRITE_WORD(p, 0);
 153 #define FLAG_READONLY   1
 154 #define FLAG_RDLOAD     4
 155 #define FLAG_RDPROMPT   8
 156     /* flags */
 157     WRITE_WORD(p, FLAG_READONLY | FLAG_RDLOAD | FLAG_RDPROMPT);
 158     /* rootdev */
 159     WRITE_WORD(p, (31 << 8) | 0);       /* /dev/mtdblock0 */
 160     /* video_num_cols */
 161     WRITE_WORD(p, 0);
 162     /* video_num_rows */
 163     WRITE_WORD(p, 0);
 164     /* video_x */
 165     WRITE_WORD(p, 0);
 166     /* video_y */
 167     WRITE_WORD(p, 0);
 168     /* memc_control_reg */
 169     WRITE_WORD(p, 0);
 170     /* unsigned char sounddefault */
 171     /* unsigned char adfsdrives */
 172     /* unsigned char bytes_per_char_h */
 173     /* unsigned char bytes_per_char_v */
 174     WRITE_WORD(p, 0);
 175     /* pages_in_bank[4] */
 176     WRITE_WORD(p, 0);
 177     WRITE_WORD(p, 0);
 178     WRITE_WORD(p, 0);
 179     WRITE_WORD(p, 0);
 180     /* pages_in_vram */
 181     WRITE_WORD(p, 0);
 182     /* initrd_start */
 183     if (initrd_size)
 184         WRITE_WORD(p, info->loader_start + INITRD_LOAD_ADDR);
 185     else
 186         WRITE_WORD(p, 0);
 187     /* initrd_size */
 188     WRITE_WORD(p, initrd_size);
 189     /* rd_start */
 190     WRITE_WORD(p, 0);
 191     /* system_rev */
 192     WRITE_WORD(p, 0);
 193     /* system_serial_low */
 194     WRITE_WORD(p, 0);
 195     /* system_serial_high */
 196     WRITE_WORD(p, 0);
 197     /* mem_fclk_21285 */
 198     WRITE_WORD(p, 0);
 199     /* zero unused fields */
 200     while (p < base + KERNEL_ARGS_ADDR + 256 + 1024) {
 201         WRITE_WORD(p, 0);
 202     }
 203     s = info->kernel_cmdline;
 204     if (s) {
 205         cpu_physical_memory_write(p, (void *)s, strlen(s) + 1);
 206     } else {
 207         WRITE_WORD(p, 0);
 208     }
 209 }
 210
 211 static void do_cpu_reset(void *opaque)
 212 {
 213     CPUState *env = opaque;
 214     const struct arm_boot_info *info = env->boot_info;
 215
 216     cpu_reset(env);
 217     if (info) {
 218         if (!info->is_linux) {
 219             /* Jump to the entry point.  */
 220             env->regs[15] = info->entry & 0xfffffffe;
 221             env->thumb = info->entry & 1;
 222         } else {
 223             if (env == first_cpu) {
 224                 env->regs[15] = info->loader_start;
 225                 if (old_param) {
 226                     set_kernel_args_old(info);
 227                 } else {
 228                     set_kernel_args(info);
 229                 }
 230             } else {
 231                 info->secondary_cpu_reset_hook(env, info);
 232             }
 233         }
 234     }
 235 }
 236
 237 void arm_load_kernel(CPUState *env, struct arm_boot_info *info)
 238 {
 239     int kernel_size;
 240     int initrd_size;
 241     int n;
 242     int is_linux = 0;
 243     uint64_t elf_entry;
 244     target_phys_addr_t entry;
 245     int big_endian;
 246
 247     /* Load the kernel.  */
 248     if (!info->kernel_filename) {
 249         fprintf(stderr, "Kernel image must be specified\n");
 250         exit(1);
 251     }
 252
 253     if (!info->secondary_cpu_reset_hook) {
 254         info->secondary_cpu_reset_hook = default_reset_secondary;
 255     }
 256     if (!info->write_secondary_boot) {
 257         info->write_secondary_boot = default_write_secondary;
 258     }
 259
 260     if (info->nb_cpus == 0)
 261         info->nb_cpus = 1;
 262
 263 #ifdef TARGET_WORDS_BIGENDIAN
 264     big_endian = 1;
 265 #else
 266     big_endian = 0;
 267 #endif
 268
 269     /* Assume that raw images are linux kernels, and ELF images are not.  */
 270     kernel_size = load_elf(info->kernel_filename, NULL, NULL, &elf_entry,
 271                            NULL, NULL, big_endian, ELF_MACHINE, 1);
 272     entry = elf_entry;
 273     if (kernel_size < 0) {
 274         kernel_size = load_uimage(info->kernel_filename, &entry, NULL,
 275                                   &is_linux);
 276     }
 277     if (kernel_size < 0) {
 278         entry = info->loader_start + KERNEL_LOAD_ADDR;
 279         kernel_size = load_image_targphys(info->kernel_filename, entry,
 280                                           ram_size - KERNEL_LOAD_ADDR);
 281         is_linux = 1;
 282     }
 283     if (kernel_size < 0) {
 284         fprintf(stderr, "qemu: could not load kernel '%s'\n",
 285                 info->kernel_filename);
 286         exit(1);
 287     }
 288     info->entry = entry;
 289     if (is_linux) {
 290         if (info->initrd_filename) {
 291             initrd_size = load_image_targphys(info->initrd_filename,
 292                                               info->loader_start
 293                                               + INITRD_LOAD_ADDR,
 294                                               ram_size - INITRD_LOAD_ADDR);
 295             if (initrd_size < 0) {
 296                 fprintf(stderr, "qemu: could not load initrd '%s'\n",
 297                         info->initrd_filename);
 298                 exit(1);
 299             }
 300         } else {
 301             initrd_size = 0;
 302         }
 303         bootloader[4] = info->board_id;
 304         bootloader[5] = info->loader_start + KERNEL_ARGS_ADDR;
 305         bootloader[6] = entry;
 306         for (n = 0; n < sizeof(bootloader) / 4; n++) {
 307             bootloader[n] = tswap32(bootloader[n]);
 308         }
 309         rom_add_blob_fixed("bootloader", bootloader, sizeof(bootloader),
 310                            info->loader_start);
 311         if (info->nb_cpus > 1) {
 312             info->write_secondary_boot(env, info);
 313         }
 314         info->initrd_size = initrd_size;
 315     }
 316     info->is_linux = is_linux;
 317
 318     for (; env; env = env->next_cpu) {
 319         env->boot_info = info;
 320         qemu_register_reset(do_cpu_reset, env);
 321     }
 322 }