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   0xe3a01000, /* mov     r1, #0x?? */
  24   0xe3811c00, /* orr     r1, r1, #0x??00 */
  25   0xe59f2000, /* ldr     r2, [pc, #0] */
  26   0xe59ff000, /* ldr     pc, [pc, #0] */
  27   0, /* Address of kernel args.  Set by integratorcp_init.  */
  28   0  /* Kernel entry point.  Set by integratorcp_init.  */
  29 };
  30
  31 /* Entry point for secondary CPUs.  Enable interrupt controller and
  32    Issue WFI until start address is written to system controller.  */
  33 static uint32_t smpboot[] = {
  34   0xe59f201c, /* ldr r2, privbase */
  35   0xe59f001c, /* ldr r0, startaddr */
  36   0xe3a01001, /* mov r1, #1 */
  37   0xe5821100, /* str r1, [r2, #256] */
  38   0xe320f003, /* wfi */
  39   0xe5901000, /* ldr     r1, [r0] */
  40   0xe1110001, /* tst     r1, r1 */
  41   0x0afffffb, /* beq     <wfi> */
  42   0xe12fff11, /* bx      r1 */
  43   0,          /* privbase: Private memory region base address.  */
  44   0           /* bootreg: Boot register address is held here */
  45 };
  46
  47 #define WRITE_WORD(p, value) do { \
  48     stl_phys_notdirty(p, value);  \
  49     p += 4;                       \
  50 } while (0)
  51
  52 static void set_kernel_args(const struct arm_boot_info *info,
  53                 int initrd_size, target_phys_addr_t base)
  54 {
  55     target_phys_addr_t p;
  56
  57     p = base + KERNEL_ARGS_ADDR;
  58     /* ATAG_CORE */
  59     WRITE_WORD(p, 5);
  60     WRITE_WORD(p, 0x54410001);
  61     WRITE_WORD(p, 1);
  62     WRITE_WORD(p, 0x1000);
  63     WRITE_WORD(p, 0);
  64     /* ATAG_MEM */
  65     /* TODO: handle multiple chips on one ATAG list */
  66     WRITE_WORD(p, 4);
  67     WRITE_WORD(p, 0x54410002);
  68     WRITE_WORD(p, info->ram_size);
  69     WRITE_WORD(p, info->loader_start);
  70     if (initrd_size) {
  71         /* ATAG_INITRD2 */
  72         WRITE_WORD(p, 4);
  73         WRITE_WORD(p, 0x54420005);
  74         WRITE_WORD(p, info->loader_start + INITRD_LOAD_ADDR);
  75         WRITE_WORD(p, initrd_size);
  76     }
  77     if (info->kernel_cmdline && *info->kernel_cmdline) {
  78         /* ATAG_CMDLINE */
  79         int cmdline_size;
  80
  81         cmdline_size = strlen(info->kernel_cmdline);
  82         cpu_physical_memory_write(p + 8, (void *)info->kernel_cmdline,
  83                                   cmdline_size + 1);
  84         cmdline_size = (cmdline_size >> 2) + 1;
  85         WRITE_WORD(p, cmdline_size + 2);
  86         WRITE_WORD(p, 0x54410009);
  87         p += cmdline_size * 4;
  88     }
  89     if (info->atag_board) {
  90         /* ATAG_BOARD */
  91         int atag_board_len;
  92         uint8_t atag_board_buf[0x1000];
  93
  94         atag_board_len = (info->atag_board(info, atag_board_buf) + 3) & ~3;
  95         WRITE_WORD(p, (atag_board_len + 8) >> 2);
  96         WRITE_WORD(p, 0x414f4d50);
  97         cpu_physical_memory_write(p, atag_board_buf, atag_board_len);
  98         p += atag_board_len;
  99     }
 100     /* ATAG_END */
 101     WRITE_WORD(p, 0);
 102     WRITE_WORD(p, 0);
 103 }
 104
 105 static void set_kernel_args_old(const struct arm_boot_info *info,
 106                 int initrd_size, target_phys_addr_t base)
 107 {
 108     target_phys_addr_t p;
 109     const char *s;
 110
 111
 112     /* see linux/include/asm-arm/setup.h */
 113     p = base + KERNEL_ARGS_ADDR;
 114     /* page_size */
 115     WRITE_WORD(p, 4096);
 116     /* nr_pages */
 117     WRITE_WORD(p, info->ram_size / 4096);
 118     /* ramdisk_size */
 119     WRITE_WORD(p, 0);
 120 #define FLAG_READONLY   1
 121 #define FLAG_RDLOAD     4
 122 #define FLAG_RDPROMPT   8
 123     /* flags */
 124     WRITE_WORD(p, FLAG_READONLY | FLAG_RDLOAD | FLAG_RDPROMPT);
 125     /* rootdev */
 126     WRITE_WORD(p, (31 << 8) | 0);       /* /dev/mtdblock0 */
 127     /* video_num_cols */
 128     WRITE_WORD(p, 0);
 129     /* video_num_rows */
 130     WRITE_WORD(p, 0);
 131     /* video_x */
 132     WRITE_WORD(p, 0);
 133     /* video_y */
 134     WRITE_WORD(p, 0);
 135     /* memc_control_reg */
 136     WRITE_WORD(p, 0);
 137     /* unsigned char sounddefault */
 138     /* unsigned char adfsdrives */
 139     /* unsigned char bytes_per_char_h */
 140     /* unsigned char bytes_per_char_v */
 141     WRITE_WORD(p, 0);
 142     /* pages_in_bank[4] */
 143     WRITE_WORD(p, 0);
 144     WRITE_WORD(p, 0);
 145     WRITE_WORD(p, 0);
 146     WRITE_WORD(p, 0);
 147     /* pages_in_vram */
 148     WRITE_WORD(p, 0);
 149     /* initrd_start */
 150     if (initrd_size)
 151         WRITE_WORD(p, info->loader_start + INITRD_LOAD_ADDR);
 152     else
 153         WRITE_WORD(p, 0);
 154     /* initrd_size */
 155     WRITE_WORD(p, initrd_size);
 156     /* rd_start */
 157     WRITE_WORD(p, 0);
 158     /* system_rev */
 159     WRITE_WORD(p, 0);
 160     /* system_serial_low */
 161     WRITE_WORD(p, 0);
 162     /* system_serial_high */
 163     WRITE_WORD(p, 0);
 164     /* mem_fclk_21285 */
 165     WRITE_WORD(p, 0);
 166     /* zero unused fields */
 167     while (p < base + KERNEL_ARGS_ADDR + 256 + 1024) {
 168         WRITE_WORD(p, 0);
 169     }
 170     s = info->kernel_cmdline;
 171     if (s) {
 172         cpu_physical_memory_write(p, (void *)s, strlen(s) + 1);
 173     } else {
 174         WRITE_WORD(p, 0);
 175     }
 176 }
 177
 178 static void do_cpu_reset(void *opaque)
 179 {
 180     CPUState *env = opaque;
 181     const struct arm_boot_info *info = env->boot_info;
 182
 183     cpu_reset(env);
 184     if (info) {
 185         if (!info->is_linux) {
 186             /* Jump to the entry point.  */
 187             env->regs[15] = info->entry & 0xfffffffe;
 188             env->thumb = info->entry & 1;
 189         } else {
 190             if (env == first_cpu) {
 191                 env->regs[15] = info->loader_start;
 192                 if (old_param) {
 193                     set_kernel_args_old(info, info->initrd_size,
 194                                         info->loader_start);
 195                 } else {
 196                     set_kernel_args(info, info->initrd_size,
 197                                     info->loader_start);
 198                 }
 199             } else {
 200                 stl_phys_notdirty(info->smp_bootreg_addr, 0);
 201                 env->regs[15] = info->smp_loader_start;
 202             }
 203         }
 204     }
 205 }
 206
 207 void arm_load_kernel(CPUState *env, struct arm_boot_info *info)
 208 {
 209     int kernel_size;
 210     int initrd_size;
 211     int n;
 212     int is_linux = 0;
 213     uint64_t elf_entry;
 214     target_phys_addr_t entry;
 215     int big_endian;
 216
 217     /* Load the kernel.  */
 218     if (!info->kernel_filename) {
 219         fprintf(stderr, "Kernel image must be specified\n");
 220         exit(1);
 221     }
 222
 223     if (info->nb_cpus == 0)
 224         info->nb_cpus = 1;
 225
 226 #ifdef TARGET_WORDS_BIGENDIAN
 227     big_endian = 1;
 228 #else
 229     big_endian = 0;
 230 #endif
 231
 232     /* Assume that raw images are linux kernels, and ELF images are not.  */
 233     kernel_size = load_elf(info->kernel_filename, NULL, NULL, &elf_entry,
 234                            NULL, NULL, big_endian, ELF_MACHINE, 1);
 235     entry = elf_entry;
 236     if (kernel_size < 0) {
 237         kernel_size = load_uimage(info->kernel_filename, &entry, NULL,
 238                                   &is_linux);
 239     }
 240     if (kernel_size < 0) {
 241         entry = info->loader_start + KERNEL_LOAD_ADDR;
 242         kernel_size = load_image_targphys(info->kernel_filename, entry,
 243                                           ram_size - KERNEL_LOAD_ADDR);
 244         is_linux = 1;
 245     }
 246     if (kernel_size < 0) {
 247         fprintf(stderr, "qemu: could not load kernel '%s'\n",
 248                 info->kernel_filename);
 249         exit(1);
 250     }
 251     info->entry = entry;
 252     if (is_linux) {
 253         if (info->initrd_filename) {
 254             initrd_size = load_image_targphys(info->initrd_filename,
 255                                               info->loader_start
 256                                               + INITRD_LOAD_ADDR,
 257                                               ram_size - INITRD_LOAD_ADDR);
 258             if (initrd_size < 0) {
 259                 fprintf(stderr, "qemu: could not load initrd '%s'\n",
 260                         info->initrd_filename);
 261                 exit(1);
 262             }
 263         } else {
 264             initrd_size = 0;
 265         }
 266         bootloader[1] |= info->board_id & 0xff;
 267         bootloader[2] |= (info->board_id >> 8) & 0xff;
 268         bootloader[5] = info->loader_start + KERNEL_ARGS_ADDR;
 269         bootloader[6] = entry;
 270         for (n = 0; n < sizeof(bootloader) / 4; n++) {
 271             bootloader[n] = tswap32(bootloader[n]);
 272         }
 273         rom_add_blob_fixed("bootloader", bootloader, sizeof(bootloader),
 274                            info->loader_start);
 275         if (info->nb_cpus > 1) {
 276             smpboot[ARRAY_SIZE(smpboot) - 1] = info->smp_bootreg_addr;
 277             smpboot[ARRAY_SIZE(smpboot) - 2] = info->smp_priv_base;
 278             for (n = 0; n < ARRAY_SIZE(smpboot); n++) {
 279                 smpboot[n] = tswap32(smpboot[n]);
 280             }
 281             rom_add_blob_fixed("smpboot", smpboot, sizeof(smpboot),
 282                                info->smp_loader_start);
 283         }
 284         info->initrd_size = initrd_size;
 285     }
 286     info->is_linux = is_linux;
 287
 288     for (; env; env = env->next_cpu) {
 289         env->boot_info = info;
 290         qemu_register_reset(do_cpu_reset, env);
 291     }
 292 }