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 licenced 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 0x00800000
  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   0xe3a00201, /* mov     r0, #0x10000000 */
  35   0xe3800601, /* orr     r0, r0, #0x001000000 */
  36   0xe3a01001, /* mov     r1, #1 */
  37   0xe5801100, /* str     r1, [r0, #0x100] */
  38   0xe3a00201, /* mov     r0, #0x10000000 */
  39   0xe3800030, /* orr     r0, #0x30 */
  40   0xe320f003, /* wfi */
  41   0xe5901000, /* ldr     r1, [r0] */
  42   0xe3110003, /* tst     r1, #3 */
  43   0x1afffffb, /* bne     <wfi> */
  44   0xe12fff11  /* bx      r1 */
  45 };
  46
  47 static void main_cpu_reset(void *opaque)
  48 {
  49     CPUState *env = opaque;
  50
  51     cpu_reset(env);
  52     if (env->boot_info)
  53         arm_load_kernel(env, env->boot_info);
  54
  55     /* TODO:  Reset secondary CPUs.  */
  56 }
  57
  58 #define WRITE_WORD(p, value) do { \
  59     stl_phys_notdirty(p, value);  \
  60     p += 4;                       \
  61 } while (0)
  62
  63 static void set_kernel_args(struct arm_boot_info *info,
  64                 int initrd_size, a_target_phys_addr base)
  65 {
  66     a_target_phys_addr p;
  67
  68     p = base + KERNEL_ARGS_ADDR;
  69     /* ATAG_CORE */
  70     WRITE_WORD(p, 5);
  71     WRITE_WORD(p, 0x54410001);
  72     WRITE_WORD(p, 1);
  73     WRITE_WORD(p, 0x1000);
  74     WRITE_WORD(p, 0);
  75     /* ATAG_MEM */
  76     /* TODO: handle multiple chips on one ATAG list */
  77     WRITE_WORD(p, 4);
  78     WRITE_WORD(p, 0x54410002);
  79     WRITE_WORD(p, info->ram_size);
  80     WRITE_WORD(p, info->loader_start);
  81     if (initrd_size) {
  82         /* ATAG_INITRD2 */
  83         WRITE_WORD(p, 4);
  84         WRITE_WORD(p, 0x54420005);
  85         WRITE_WORD(p, info->loader_start + INITRD_LOAD_ADDR);
  86         WRITE_WORD(p, initrd_size);
  87     }
  88     if (info->kernel_cmdline && *info->kernel_cmdline) {
  89         /* ATAG_CMDLINE */
  90         int cmdline_size;
  91
  92         cmdline_size = strlen(info->kernel_cmdline);
  93         cpu_physical_memory_write(p + 8, (void *)info->kernel_cmdline,
  94                                   cmdline_size + 1);
  95         cmdline_size = (cmdline_size >> 2) + 1;
  96         WRITE_WORD(p, cmdline_size + 2);
  97         WRITE_WORD(p, 0x54410009);
  98         p += cmdline_size * 4;
  99     }
 100     if (info->atag_board) {
 101         /* ATAG_BOARD */
 102         int atag_board_len;
 103         uint8_t atag_board_buf[0x1000];
 104
 105         atag_board_len = (info->atag_board(info, atag_board_buf) + 3) & ~3;
 106         WRITE_WORD(p, (atag_board_len + 8) >> 2);
 107         WRITE_WORD(p, 0x414f4d50);
 108         cpu_physical_memory_write(p, atag_board_buf, atag_board_len);
 109         p += atag_board_len;
 110     }
 111     /* ATAG_END */
 112     WRITE_WORD(p, 0);
 113     WRITE_WORD(p, 0);
 114 }
 115
 116 static void set_kernel_args_old(struct arm_boot_info *info,
 117                 int initrd_size, a_target_phys_addr base)
 118 {
 119     a_target_phys_addr p;
 120     const char *s;
 121
 122
 123     /* see linux/include/asm-arm/setup.h */
 124     p = base + KERNEL_ARGS_ADDR;
 125     /* page_size */
 126     WRITE_WORD(p, 4096);
 127     /* nr_pages */
 128     WRITE_WORD(p, info->ram_size / 4096);
 129     /* ramdisk_size */
 130     WRITE_WORD(p, 0);
 131 #define FLAG_READONLY   1
 132 #define FLAG_RDLOAD     4
 133 #define FLAG_RDPROMPT   8
 134     /* flags */
 135     WRITE_WORD(p, FLAG_READONLY | FLAG_RDLOAD | FLAG_RDPROMPT);
 136     /* rootdev */
 137     WRITE_WORD(p, (31 << 8) | 0);       /* /dev/mtdblock0 */
 138     /* video_num_cols */
 139     WRITE_WORD(p, 0);
 140     /* video_num_rows */
 141     WRITE_WORD(p, 0);
 142     /* video_x */
 143     WRITE_WORD(p, 0);
 144     /* video_y */
 145     WRITE_WORD(p, 0);
 146     /* memc_control_reg */
 147     WRITE_WORD(p, 0);
 148     /* unsigned char sounddefault */
 149     /* unsigned char adfsdrives */
 150     /* unsigned char bytes_per_char_h */
 151     /* unsigned char bytes_per_char_v */
 152     WRITE_WORD(p, 0);
 153     /* pages_in_bank[4] */
 154     WRITE_WORD(p, 0);
 155     WRITE_WORD(p, 0);
 156     WRITE_WORD(p, 0);
 157     WRITE_WORD(p, 0);
 158     /* pages_in_vram */
 159     WRITE_WORD(p, 0);
 160     /* initrd_start */
 161     if (initrd_size)
 162         WRITE_WORD(p, info->loader_start + INITRD_LOAD_ADDR);
 163     else
 164         WRITE_WORD(p, 0);
 165     /* initrd_size */
 166     WRITE_WORD(p, initrd_size);
 167     /* rd_start */
 168     WRITE_WORD(p, 0);
 169     /* system_rev */
 170     WRITE_WORD(p, 0);
 171     /* system_serial_low */
 172     WRITE_WORD(p, 0);
 173     /* system_serial_high */
 174     WRITE_WORD(p, 0);
 175     /* mem_fclk_21285 */
 176     WRITE_WORD(p, 0);
 177     /* zero unused fields */
 178     while (p < base + KERNEL_ARGS_ADDR + 256 + 1024) {
 179         WRITE_WORD(p, 0);
 180     }
 181     s = info->kernel_cmdline;
 182     if (s) {
 183         cpu_physical_memory_write(p, (void *)s, strlen(s) + 1);
 184     } else {
 185         WRITE_WORD(p, 0);
 186     }
 187 }
 188
 189 void arm_load_kernel(CPUState *env, struct arm_boot_info *info)
 190 {
 191     int kernel_size;
 192     int initrd_size;
 193     int n;
 194     int is_linux = 0;
 195     uint64_t elf_entry;
 196     a_target_phys_addr entry;
 197     int big_endian;
 198
 199     /* Load the kernel.  */
 200     if (!info->kernel_filename) {
 201         fprintf(stderr, "Kernel image must be specified\n");
 202         exit(1);
 203     }
 204
 205     if (!env->boot_info) {
 206         if (info->nb_cpus == 0)
 207             info->nb_cpus = 1;
 208         env->boot_info = info;
 209         qemu_register_reset(main_cpu_reset, env);
 210     }
 211
 212 #ifdef TARGET_WORDS_BIGENDIAN
 213     big_endian = 1;
 214 #else
 215     big_endian = 0;
 216 #endif
 217
 218     /* Assume that raw images are linux kernels, and ELF images are not.  */
 219     kernel_size = load_elf(info->kernel_filename, 0, &elf_entry, NULL, NULL,
 220                            big_endian, ELF_MACHINE, 1);
 221     entry = elf_entry;
 222     if (kernel_size < 0) {
 223         kernel_size = load_uimage(info->kernel_filename, &entry, NULL,
 224                                   &is_linux);
 225     }
 226     if (kernel_size < 0) {
 227         entry = info->loader_start + KERNEL_LOAD_ADDR;
 228         kernel_size = load_image_targphys(info->kernel_filename, entry,
 229                                           ram_size - KERNEL_LOAD_ADDR);
 230         is_linux = 1;
 231     }
 232     if (kernel_size < 0) {
 233         fprintf(stderr, "qemu: could not load kernel '%s'\n",
 234                 info->kernel_filename);
 235         exit(1);
 236     }
 237     if (!is_linux) {
 238         /* Jump to the entry point.  */
 239         env->regs[15] = entry & 0xfffffffe;
 240         env->thumb = entry & 1;
 241     } else {
 242         if (info->initrd_filename) {
 243             initrd_size = load_image_targphys(info->initrd_filename,
 244                                               info->loader_start
 245                                               + INITRD_LOAD_ADDR,
 246                                               ram_size - INITRD_LOAD_ADDR);
 247             if (initrd_size < 0) {
 248                 fprintf(stderr, "qemu: could not load initrd '%s'\n",
 249                         info->initrd_filename);
 250                 exit(1);
 251             }
 252         } else {
 253             initrd_size = 0;
 254         }
 255         bootloader[1] |= info->board_id & 0xff;
 256         bootloader[2] |= (info->board_id >> 8) & 0xff;
 257         bootloader[5] = info->loader_start + KERNEL_ARGS_ADDR;
 258         bootloader[6] = entry;
 259         for (n = 0; n < sizeof(bootloader) / 4; n++) {
 260             stl_phys_notdirty(info->loader_start + (n * 4), bootloader[n]);
 261         }
 262         if (info->nb_cpus > 1) {
 263             for (n = 0; n < sizeof(smpboot) / 4; n++) {
 264                 stl_phys_notdirty(info->smp_loader_start + (n * 4), smpboot[n]);
 265             }
 266         }
 267         if (old_param)
 268             set_kernel_args_old(info, initrd_size, info->loader_start);
 269         else
 270             set_kernel_args(info, initrd_size, info->loader_start);
 271     }
 272 }