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 "vl.h"
  11
  12 #define KERNEL_ARGS_ADDR 0x100
  13 #define KERNEL_LOAD_ADDR 0x00010000
  14 #define INITRD_LOAD_ADDR 0x00800000
  15
  16 /* The worlds second smallest bootloader.  Set r0-r2, then jump to kernel.  */
  17 static uint32_t bootloader[] = {
  18   0xe3a00000, /* mov     r0, #0 */
  19   0xe3a01000, /* mov     r1, #0x?? */
  20   0xe3811c00, /* orr     r1, r1, #0x??00 */
  21   0xe59f2000, /* ldr     r2, [pc, #0] */
  22   0xe59ff000, /* ldr     pc, [pc, #0] */
  23   0, /* Address of kernel args.  Set by integratorcp_init.  */
  24   0  /* Kernel entry point.  Set by integratorcp_init.  */
  25 };
  26
  27 /* Entry point for secondary CPUs.  Enable interrupt controller and
  28    Issue WFI until start address is written to system controller.  */
  29 static uint32_t smpboot[] = {
  30   0xe3a00201, /* mov     r0, #0x10000000 */
  31   0xe3800601, /* orr     r0, r0, #0x001000000 */
  32   0xe3a01001, /* mov     r1, #1 */
  33   0xe5801100, /* str     r1, [r0, #0x100] */
  34   0xe3a00201, /* mov     r0, #0x10000000 */
  35   0xe3800030, /* orr     r0, #0x30 */
  36   0xe320f003, /* wfi */
  37   0xe5901000, /* ldr     r1, [r0] */
  38   0xe3110003, /* tst     r1, #3 */
  39   0x1afffffb, /* bne     <wfi> */
  40   0xe12fff11  /* bx      r1 */
  41 };
  42
  43 static void main_cpu_reset(void *opaque)
  44 {
  45     CPUState *env = opaque;
  46
  47     cpu_reset(env);
  48     if (env->kernel_filename)
  49         arm_load_kernel(env, env->ram_size, env->kernel_filename,
  50                         env->kernel_cmdline, env->initrd_filename,
  51                         env->board_id, env->loader_start);
  52
  53     /* TODO:  Reset secondary CPUs.  */
  54 }
  55
  56 static void set_kernel_args(uint32_t ram_size, int initrd_size,
  57                             const char *kernel_cmdline,
  58                             target_phys_addr_t loader_start)
  59 {
  60     uint32_t *p;
  61
  62     p = (uint32_t *)(phys_ram_base + KERNEL_ARGS_ADDR);
  63     /* ATAG_CORE */
  64     stl_raw(p++, 5);
  65     stl_raw(p++, 0x54410001);
  66     stl_raw(p++, 1);
  67     stl_raw(p++, 0x1000);
  68     stl_raw(p++, 0);
  69     /* ATAG_MEM */
  70     stl_raw(p++, 4);
  71     stl_raw(p++, 0x54410002);
  72     stl_raw(p++, ram_size);
  73     stl_raw(p++, loader_start);
  74     if (initrd_size) {
  75         /* ATAG_INITRD2 */
  76         stl_raw(p++, 4);
  77         stl_raw(p++, 0x54420005);
  78         stl_raw(p++, loader_start + INITRD_LOAD_ADDR);
  79         stl_raw(p++, initrd_size);
  80     }
  81     if (kernel_cmdline && *kernel_cmdline) {
  82         /* ATAG_CMDLINE */
  83         int cmdline_size;
  84
  85         cmdline_size = strlen(kernel_cmdline);
  86         memcpy (p + 2, 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     /* ATAG_END */
  93     stl_raw(p++, 0);
  94     stl_raw(p++, 0);
  95 }
  96
  97 static void set_kernel_args_old(uint32_t ram_size, int initrd_size,
  98                                 const char *kernel_cmdline,
  99                                 target_phys_addr_t loader_start)
 100 {
 101     uint32_t *p;
 102     unsigned char *s;
 103
 104     /* see linux/include/asm-arm/setup.h */
 105     p = (uint32_t *)(phys_ram_base + KERNEL_ARGS_ADDR);
 106     /* page_size */
 107     stl_raw(p++, 4096);
 108     /* nr_pages */
 109     stl_raw(p++, ram_size / 4096);
 110     /* ramdisk_size */
 111     stl_raw(p++, 0);
 112 #define FLAG_READONLY   1
 113 #define FLAG_RDLOAD     4
 114 #define FLAG_RDPROMPT   8
 115     /* flags */
 116     stl_raw(p++, FLAG_READONLY | FLAG_RDLOAD | FLAG_RDPROMPT);
 117     /* rootdev */
 118     stl_raw(p++, (31 << 8) | 0);        /* /dev/mtdblock0 */
 119     /* video_num_cols */
 120     stl_raw(p++, 0);
 121     /* video_num_rows */
 122     stl_raw(p++, 0);
 123     /* video_x */
 124     stl_raw(p++, 0);
 125     /* video_y */
 126     stl_raw(p++, 0);
 127     /* memc_control_reg */
 128     stl_raw(p++, 0);
 129     /* unsigned char sounddefault */
 130     /* unsigned char adfsdrives */
 131     /* unsigned char bytes_per_char_h */
 132     /* unsigned char bytes_per_char_v */
 133     stl_raw(p++, 0);
 134     /* pages_in_bank[4] */
 135     stl_raw(p++, 0);
 136     stl_raw(p++, 0);
 137     stl_raw(p++, 0);
 138     stl_raw(p++, 0);
 139     /* pages_in_vram */
 140     stl_raw(p++, 0);
 141     /* initrd_start */
 142     if (initrd_size)
 143         stl_raw(p++, loader_start + INITRD_LOAD_ADDR);
 144     else
 145         stl_raw(p++, 0);
 146     /* initrd_size */
 147     stl_raw(p++, initrd_size);
 148     /* rd_start */
 149     stl_raw(p++, 0);
 150     /* system_rev */
 151     stl_raw(p++, 0);
 152     /* system_serial_low */
 153     stl_raw(p++, 0);
 154     /* system_serial_high */
 155     stl_raw(p++, 0);
 156     /* mem_fclk_21285 */
 157     stl_raw(p++, 0);
 158     /* zero unused fields */
 159     memset(p, 0, 256 + 1024 -
 160            (p - ((uint32_t *)(phys_ram_base + KERNEL_ARGS_ADDR))));
 161     s = phys_ram_base + KERNEL_ARGS_ADDR + 256 + 1024;
 162     if (kernel_cmdline)
 163         strcpy (s, kernel_cmdline);
 164     else
 165         stb_raw(s, 0);
 166 }
 167
 168 void arm_load_kernel(CPUState *env, int ram_size, const char *kernel_filename,
 169                      const char *kernel_cmdline, const char *initrd_filename,
 170                      int board_id, target_phys_addr_t loader_start)
 171 {
 172     int kernel_size;
 173     int initrd_size;
 174     int n;
 175     int is_linux = 0;
 176     uint64_t elf_entry;
 177     target_ulong entry;
 178
 179     /* Load the kernel.  */
 180     if (!kernel_filename) {
 181         fprintf(stderr, "Kernel image must be specified\n");
 182         exit(1);
 183     }
 184
 185     if (!env->kernel_filename) {
 186         env->ram_size = ram_size;
 187         env->kernel_filename = kernel_filename;
 188         env->kernel_cmdline = kernel_cmdline;
 189         env->initrd_filename = initrd_filename;
 190         env->board_id = board_id;
 191         env->loader_start = loader_start;
 192         qemu_register_reset(main_cpu_reset, env);
 193     }
 194     /* Assume that raw images are linux kernels, and ELF images are not.  */
 195     kernel_size = load_elf(kernel_filename, 0, &elf_entry, NULL, NULL);
 196     entry = elf_entry;
 197     if (kernel_size < 0) {
 198         kernel_size = load_uboot(kernel_filename, &entry, &is_linux);
 199     }
 200     if (kernel_size < 0) {
 201         kernel_size = load_image(kernel_filename,
 202                                  phys_ram_base + KERNEL_LOAD_ADDR);
 203         entry = loader_start + KERNEL_LOAD_ADDR;
 204         is_linux = 1;
 205     }
 206     if (kernel_size < 0) {
 207         fprintf(stderr, "qemu: could not load kernel '%s'\n", kernel_filename);
 208         exit(1);
 209     }
 210     if (!is_linux) {
 211         /* Jump to the entry point.  */
 212         env->regs[15] = entry & 0xfffffffe;
 213         env->thumb = entry & 1;
 214     } else {
 215         if (initrd_filename) {
 216             initrd_size = load_image(initrd_filename,
 217                                      phys_ram_base + INITRD_LOAD_ADDR);
 218             if (initrd_size < 0) {
 219                 fprintf(stderr, "qemu: could not load initrd '%s'\n",
 220                         initrd_filename);
 221                 exit(1);
 222             }
 223         } else {
 224             initrd_size = 0;
 225         }
 226         bootloader[1] |= board_id & 0xff;
 227         bootloader[2] |= (board_id >> 8) & 0xff;
 228         bootloader[5] = loader_start + KERNEL_ARGS_ADDR;
 229         bootloader[6] = entry;
 230         for (n = 0; n < sizeof(bootloader) / 4; n++)
 231             stl_raw(phys_ram_base + (n * 4), bootloader[n]);
 232         for (n = 0; n < sizeof(smpboot) / 4; n++)
 233             stl_raw(phys_ram_base + ram_size + (n * 4), smpboot[n]);
 234         if (old_param)
 235             set_kernel_args_old(ram_size, initrd_size,
 236                                 kernel_cmdline, loader_start);
 237         else
 238             set_kernel_args(ram_size, initrd_size,
 239                             kernel_cmdline, loader_start);
 240     }
 241 }