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->kernel_filename)
  51         arm_load_kernel(env, env->ram_size, env->kernel_filename,
  52                         env->kernel_cmdline, env->initrd_filename,
  53                         env->board_id, env->loader_start);
  54
  55     /* TODO:  Reset secondary CPUs.  */
  56 }
  57
  58 static void set_kernel_args(uint32_t ram_size, int initrd_size,
  59                             const char *kernel_cmdline,
  60                             target_phys_addr_t loader_start)
  61 {
  62     uint32_t *p;
  63
  64     p = (uint32_t *)(phys_ram_base + KERNEL_ARGS_ADDR);
  65     /* ATAG_CORE */
  66     stl_raw(p++, 5);
  67     stl_raw(p++, 0x54410001);
  68     stl_raw(p++, 1);
  69     stl_raw(p++, 0x1000);
  70     stl_raw(p++, 0);
  71     /* ATAG_MEM */
  72     stl_raw(p++, 4);
  73     stl_raw(p++, 0x54410002);
  74     stl_raw(p++, ram_size);
  75     stl_raw(p++, loader_start);
  76     if (initrd_size) {
  77         /* ATAG_INITRD2 */
  78         stl_raw(p++, 4);
  79         stl_raw(p++, 0x54420005);
  80         stl_raw(p++, loader_start + INITRD_LOAD_ADDR);
  81         stl_raw(p++, initrd_size);
  82     }
  83     if (kernel_cmdline && *kernel_cmdline) {
  84         /* ATAG_CMDLINE */
  85         int cmdline_size;
  86
  87         cmdline_size = strlen(kernel_cmdline);
  88         memcpy (p + 2, kernel_cmdline, cmdline_size + 1);
  89         cmdline_size = (cmdline_size >> 2) + 1;
  90         stl_raw(p++, cmdline_size + 2);
  91         stl_raw(p++, 0x54410009);
  92         p += cmdline_size;
  93     }
  94     /* ATAG_END */
  95     stl_raw(p++, 0);
  96     stl_raw(p++, 0);
  97 }
  98
  99 static void set_kernel_args_old(uint32_t ram_size, int initrd_size,
 100                                 const char *kernel_cmdline,
 101                                 target_phys_addr_t loader_start)
 102 {
 103     uint32_t *p;
 104     unsigned char *s;
 105
 106     /* see linux/include/asm-arm/setup.h */
 107     p = (uint32_t *)(phys_ram_base + KERNEL_ARGS_ADDR);
 108     /* page_size */
 109     stl_raw(p++, 4096);
 110     /* nr_pages */
 111     stl_raw(p++, ram_size / 4096);
 112     /* ramdisk_size */
 113     stl_raw(p++, 0);
 114 #define FLAG_READONLY   1
 115 #define FLAG_RDLOAD     4
 116 #define FLAG_RDPROMPT   8
 117     /* flags */
 118     stl_raw(p++, FLAG_READONLY | FLAG_RDLOAD | FLAG_RDPROMPT);
 119     /* rootdev */
 120     stl_raw(p++, (31 << 8) | 0);        /* /dev/mtdblock0 */
 121     /* video_num_cols */
 122     stl_raw(p++, 0);
 123     /* video_num_rows */
 124     stl_raw(p++, 0);
 125     /* video_x */
 126     stl_raw(p++, 0);
 127     /* video_y */
 128     stl_raw(p++, 0);
 129     /* memc_control_reg */
 130     stl_raw(p++, 0);
 131     /* unsigned char sounddefault */
 132     /* unsigned char adfsdrives */
 133     /* unsigned char bytes_per_char_h */
 134     /* unsigned char bytes_per_char_v */
 135     stl_raw(p++, 0);
 136     /* pages_in_bank[4] */
 137     stl_raw(p++, 0);
 138     stl_raw(p++, 0);
 139     stl_raw(p++, 0);
 140     stl_raw(p++, 0);
 141     /* pages_in_vram */
 142     stl_raw(p++, 0);
 143     /* initrd_start */
 144     if (initrd_size)
 145         stl_raw(p++, loader_start + INITRD_LOAD_ADDR);
 146     else
 147         stl_raw(p++, 0);
 148     /* initrd_size */
 149     stl_raw(p++, initrd_size);
 150     /* rd_start */
 151     stl_raw(p++, 0);
 152     /* system_rev */
 153     stl_raw(p++, 0);
 154     /* system_serial_low */
 155     stl_raw(p++, 0);
 156     /* system_serial_high */
 157     stl_raw(p++, 0);
 158     /* mem_fclk_21285 */
 159     stl_raw(p++, 0);
 160     /* zero unused fields */
 161     memset(p, 0, 256 + 1024 -
 162            (p - ((uint32_t *)(phys_ram_base + KERNEL_ARGS_ADDR))));
 163     s = phys_ram_base + KERNEL_ARGS_ADDR + 256 + 1024;
 164     if (kernel_cmdline)
 165         strcpy (s, kernel_cmdline);
 166     else
 167         stb_raw(s, 0);
 168 }
 169
 170 void arm_load_kernel(CPUState *env, int ram_size, const char *kernel_filename,
 171                      const char *kernel_cmdline, const char *initrd_filename,
 172                      int board_id, target_phys_addr_t loader_start)
 173 {
 174     int kernel_size;
 175     int initrd_size;
 176     int n;
 177     int is_linux = 0;
 178     uint64_t elf_entry;
 179     target_ulong entry;
 180
 181     /* Load the kernel.  */
 182     if (!kernel_filename) {
 183         fprintf(stderr, "Kernel image must be specified\n");
 184         exit(1);
 185     }
 186
 187     if (!env->kernel_filename) {
 188         env->ram_size = ram_size;
 189         env->kernel_filename = kernel_filename;
 190         env->kernel_cmdline = kernel_cmdline;
 191         env->initrd_filename = initrd_filename;
 192         env->board_id = board_id;
 193         env->loader_start = loader_start;
 194         qemu_register_reset(main_cpu_reset, env);
 195     }
 196     /* Assume that raw images are linux kernels, and ELF images are not.  */
 197     kernel_size = load_elf(kernel_filename, 0, &elf_entry, NULL, NULL);
 198     entry = elf_entry;
 199     if (kernel_size < 0) {
 200         kernel_size = load_uboot(kernel_filename, &entry, &is_linux);
 201     }
 202     if (kernel_size < 0) {
 203         kernel_size = load_image(kernel_filename,
 204                                  phys_ram_base + KERNEL_LOAD_ADDR);
 205         entry = loader_start + KERNEL_LOAD_ADDR;
 206         is_linux = 1;
 207     }
 208     if (kernel_size < 0) {
 209         fprintf(stderr, "qemu: could not load kernel '%s'\n", kernel_filename);
 210         exit(1);
 211     }
 212     if (!is_linux) {
 213         /* Jump to the entry point.  */
 214         env->regs[15] = entry & 0xfffffffe;
 215         env->thumb = entry & 1;
 216     } else {
 217         if (initrd_filename) {
 218             initrd_size = load_image(initrd_filename,
 219                                      phys_ram_base + INITRD_LOAD_ADDR);
 220             if (initrd_size < 0) {
 221                 fprintf(stderr, "qemu: could not load initrd '%s'\n",
 222                         initrd_filename);
 223                 exit(1);
 224             }
 225         } else {
 226             initrd_size = 0;
 227         }
 228         bootloader[1] |= board_id & 0xff;
 229         bootloader[2] |= (board_id >> 8) & 0xff;
 230         bootloader[5] = loader_start + KERNEL_ARGS_ADDR;
 231         bootloader[6] = entry;
 232         for (n = 0; n < sizeof(bootloader) / 4; n++)
 233             stl_raw(phys_ram_base + (n * 4), bootloader[n]);
 234         for (n = 0; n < sizeof(smpboot) / 4; n++)
 235             stl_raw(phys_ram_base + ram_size + (n * 4), smpboot[n]);
 236         if (old_param)
 237             set_kernel_args_old(ram_size, initrd_size,
 238                                 kernel_cmdline, loader_start);
 239         else
 240             set_kernel_args(ram_size, initrd_size,
 241                             kernel_cmdline, loader_start);
 242     }
 243 }