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
  14 #define KERNEL_ARGS_ADDR 0x100
  15 #define KERNEL_LOAD_ADDR 0x00010000
  16 #define INITRD_LOAD_ADDR 0x00800000
  17
  18 /* The worlds second smallest bootloader.  Set r0-r2, then jump to kernel.  */
  19 static uint32_t bootloader[] = {
  20   0xe3a00000, /* mov     r0, #0 */
  21   0xe3a01000, /* mov     r1, #0x?? */
  22   0xe3811c00, /* orr     r1, r1, #0x??00 */
  23   0xe59f2000, /* ldr     r2, [pc, #0] */
  24   0xe59ff000, /* ldr     pc, [pc, #0] */
  25   0, /* Address of kernel args.  Set by integratorcp_init.  */
  26   0  /* Kernel entry point.  Set by integratorcp_init.  */
  27 };
  28
  29 /* Entry point for secondary CPUs.  Enable interrupt controller and
  30    Issue WFI until start address is written to system controller.  */
  31 static uint32_t smpboot[] = {
  32   0xe3a00201, /* mov     r0, #0x10000000 */
  33   0xe3800601, /* orr     r0, r0, #0x001000000 */
  34   0xe3a01001, /* mov     r1, #1 */
  35   0xe5801100, /* str     r1, [r0, #0x100] */
  36   0xe3a00201, /* mov     r0, #0x10000000 */
  37   0xe3800030, /* orr     r0, #0x30 */
  38   0xe320f003, /* wfi */
  39   0xe5901000, /* ldr     r1, [r0] */
  40   0xe3110003, /* tst     r1, #3 */
  41   0x1afffffb, /* bne     <wfi> */
  42   0xe12fff11  /* bx      r1 */
  43 };
  44
  45 static void main_cpu_reset(void *opaque)
  46 {
  47     CPUState *env = opaque;
  48
  49     cpu_reset(env);
  50     if (env->boot_info)
  51         arm_load_kernel(env, env->boot_info);
  52
  53     /* TODO:  Reset secondary CPUs.  */
  54 }
  55
  56 static void set_kernel_args(struct arm_boot_info *info,
  57                 int initrd_size, void *base)
  58 {
  59     uint32_t *p;
  60
  61     p = (uint32_t *)(base + KERNEL_ARGS_ADDR);
  62     /* ATAG_CORE */
  63     stl_raw(p++, 5);
  64     stl_raw(p++, 0x54410001);
  65     stl_raw(p++, 1);
  66     stl_raw(p++, 0x1000);
  67     stl_raw(p++, 0);
  68     /* ATAG_MEM */
  69     /* TODO: handle multiple chips on one ATAG list */
  70     stl_raw(p++, 4);
  71     stl_raw(p++, 0x54410002);
  72     stl_raw(p++, info->ram_size);
  73     stl_raw(p++, info->loader_start);
  74     if (initrd_size) {
  75         /* ATAG_INITRD2 */
  76         stl_raw(p++, 4);
  77         stl_raw(p++, 0x54420005);
  78         stl_raw(p++, info->loader_start + INITRD_LOAD_ADDR);
  79         stl_raw(p++, initrd_size);
  80     }
  81     if (info->kernel_cmdline && *info->kernel_cmdline) {
  82         /* ATAG_CMDLINE */
  83         int cmdline_size;
  84
  85         cmdline_size = strlen(info->kernel_cmdline);
  86         memcpy(p + 2, info->kernel_cmdline, cmdline_size + 1);
  87         cmdline_size = (cmdline_size >> 2) + 1;
  88         stl_raw(p++, cmdline_size + 2);
  89         stl_raw(p++, 0x54410009);
  90         p += cmdline_size;
  91     }
  92     if (info->atag_board) {
  93         /* ATAG_BOARD */
  94         int atag_board_len;
  95
  96         atag_board_len = (info->atag_board(info, p + 2) + 3) >> 2;
  97         stl_raw(p++, 2 + atag_board_len);
  98         stl_raw(p++, 0x414f4d50);
  99         p += atag_board_len;
 100     }
 101     /* ATAG_END */
 102     stl_raw(p++, 0);
 103     stl_raw(p++, 0);
 104 }
 105
 106 static void set_kernel_args_old(struct arm_boot_info *info,
 107                 int initrd_size, void *base)
 108 {
 109     uint32_t *p;
 110     unsigned char *s;
 111
 112     /* see linux/include/asm-arm/setup.h */
 113     p = (uint32_t *)(base + KERNEL_ARGS_ADDR);
 114     /* page_size */
 115     stl_raw(p++, 4096);
 116     /* nr_pages */
 117     stl_raw(p++, info->ram_size / 4096);
 118     /* ramdisk_size */
 119     stl_raw(p++, 0);
 120 #define FLAG_READONLY   1
 121 #define FLAG_RDLOAD     4
 122 #define FLAG_RDPROMPT   8
 123     /* flags */
 124     stl_raw(p++, FLAG_READONLY | FLAG_RDLOAD | FLAG_RDPROMPT);
 125     /* rootdev */
 126     stl_raw(p++, (31 << 8) | 0);        /* /dev/mtdblock0 */
 127     /* video_num_cols */
 128     stl_raw(p++, 0);
 129     /* video_num_rows */
 130     stl_raw(p++, 0);
 131     /* video_x */
 132     stl_raw(p++, 0);
 133     /* video_y */
 134     stl_raw(p++, 0);
 135     /* memc_control_reg */
 136     stl_raw(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     stl_raw(p++, 0);
 142     /* pages_in_bank[4] */
 143     stl_raw(p++, 0);
 144     stl_raw(p++, 0);
 145     stl_raw(p++, 0);
 146     stl_raw(p++, 0);
 147     /* pages_in_vram */
 148     stl_raw(p++, 0);
 149     /* initrd_start */
 150     if (initrd_size)
 151         stl_raw(p++, info->loader_start + INITRD_LOAD_ADDR);
 152     else
 153         stl_raw(p++, 0);
 154     /* initrd_size */
 155     stl_raw(p++, initrd_size);
 156     /* rd_start */
 157     stl_raw(p++, 0);
 158     /* system_rev */
 159     stl_raw(p++, 0);
 160     /* system_serial_low */
 161     stl_raw(p++, 0);
 162     /* system_serial_high */
 163     stl_raw(p++, 0);
 164     /* mem_fclk_21285 */
 165     stl_raw(p++, 0);
 166     /* zero unused fields */
 167     memset(p, 0, 256 + 1024 -
 168            (p - ((uint32_t *)(base + KERNEL_ARGS_ADDR))));
 169     s = base + KERNEL_ARGS_ADDR + 256 + 1024;
 170     if (info->kernel_cmdline)
 171         strcpy (s, info->kernel_cmdline);
 172     else
 173         stb_raw(s, 0);
 174 }
 175
 176 void arm_load_kernel(CPUState *env, struct arm_boot_info *info)
 177 {
 178     int kernel_size;
 179     int initrd_size;
 180     int n;
 181     int is_linux = 0;
 182     uint64_t elf_entry;
 183     target_ulong entry;
 184     uint32_t pd;
 185     void *loader_phys;
 186
 187     /* Load the kernel.  */
 188     if (!info->kernel_filename) {
 189         fprintf(stderr, "Kernel image must be specified\n");
 190         exit(1);
 191     }
 192
 193     if (!env->boot_info) {
 194         if (info->nb_cpus == 0)
 195             info->nb_cpus = 1;
 196         env->boot_info = info;
 197         qemu_register_reset(main_cpu_reset, env);
 198     }
 199
 200     pd = cpu_get_physical_page_desc(info->loader_start);
 201     loader_phys = phys_ram_base + (pd & TARGET_PAGE_MASK) +
 202             (info->loader_start & ~TARGET_PAGE_MASK);
 203
 204     /* Assume that raw images are linux kernels, and ELF images are not.  */
 205     kernel_size = load_elf(info->kernel_filename, 0, &elf_entry, NULL, NULL);
 206     entry = elf_entry;
 207     if (kernel_size < 0) {
 208         kernel_size = load_uimage(info->kernel_filename, &entry, NULL,
 209                                   &is_linux);
 210     }
 211     if (kernel_size < 0) {
 212         kernel_size = load_image(info->kernel_filename,
 213                                  loader_phys + KERNEL_LOAD_ADDR);
 214         entry = info->loader_start + KERNEL_LOAD_ADDR;
 215         is_linux = 1;
 216     }
 217     if (kernel_size < 0) {
 218         fprintf(stderr, "qemu: could not load kernel '%s'\n",
 219                 info->kernel_filename);
 220         exit(1);
 221     }
 222     if (!is_linux) {
 223         /* Jump to the entry point.  */
 224         env->regs[15] = entry & 0xfffffffe;
 225         env->thumb = entry & 1;
 226     } else {
 227         if (info->initrd_filename) {
 228             initrd_size = load_image(info->initrd_filename,
 229                                      loader_phys + INITRD_LOAD_ADDR);
 230             if (initrd_size < 0) {
 231                 fprintf(stderr, "qemu: could not load initrd '%s'\n",
 232                         info->initrd_filename);
 233                 exit(1);
 234             }
 235         } else {
 236             initrd_size = 0;
 237         }
 238         bootloader[1] |= info->board_id & 0xff;
 239         bootloader[2] |= (info->board_id >> 8) & 0xff;
 240         bootloader[5] = info->loader_start + KERNEL_ARGS_ADDR;
 241         bootloader[6] = entry;
 242         for (n = 0; n < sizeof(bootloader) / 4; n++)
 243             stl_raw(loader_phys + (n * 4), bootloader[n]);
 244         if (info->nb_cpus > 1)
 245             for (n = 0; n < sizeof(smpboot) / 4; n++)
 246                 stl_raw(loader_phys + info->ram_size + (n * 4), smpboot[n]);
 247         if (old_param)
 248             set_kernel_args_old(info, initrd_size, loader_phys);
 249         else
 250             set_kernel_args(info, initrd_size, loader_phys);
 251     }
 252 }