hw/dummy_m68k.c

   1 /*
   2  * Dummy board with just RAM and CPU for use as an ISS.
   3  *
   4  * Copyright (c) 2007 CodeSourcery.
   5  *
   6  * This code is licensed under the GPL
   7  */
   8
   9 #include "hw.h"
  10 #include "boards.h"
  11 #include "loader.h"
  12 #include "elf.h"
  13 #include "exec/address-spaces.h"
  14
  15 #define KERNEL_LOAD_ADDR 0x10000
  16
  17 /* Board init.  */
  18
  19 static void dummy_m68k_init(QEMUMachineInitArgs *args)
  20 {
  21     ram_addr_t ram_size = args->ram_size;
  22     const char *cpu_model = args->cpu_model;
  23     const char *kernel_filename = args->kernel_filename;
  24     CPUM68KState *env;
  25     MemoryRegion *address_space_mem =  get_system_memory();
  26     MemoryRegion *ram = g_new(MemoryRegion, 1);
  27     int kernel_size;
  28     uint64_t elf_entry;
  29     hwaddr entry;
  30
  31     if (!cpu_model)
  32         cpu_model = "cfv4e";
  33     env = cpu_init(cpu_model);
  34     if (!env) {
  35         fprintf(stderr, "Unable to find m68k CPU definition\n");
  36         exit(1);
  37     }
  38
  39     /* Initialize CPU registers.  */
  40     env->vbr = 0;
  41
  42     /* RAM at address zero */
  43     memory_region_init_ram(ram, "dummy_m68k.ram", ram_size);
  44     vmstate_register_ram_global(ram);
  45     memory_region_add_subregion(address_space_mem, 0, ram);
  46
  47     /* Load kernel.  */
  48     if (kernel_filename) {
  49         kernel_size = load_elf(kernel_filename, NULL, NULL, &elf_entry,
  50                                NULL, NULL, 1, ELF_MACHINE, 0);
  51         entry = elf_entry;
  52         if (kernel_size < 0) {
  53             kernel_size = load_uimage(kernel_filename, &entry, NULL, NULL);
  54         }
  55         if (kernel_size < 0) {
  56             kernel_size = load_image_targphys(kernel_filename,
  57                                               KERNEL_LOAD_ADDR,
  58                                               ram_size - KERNEL_LOAD_ADDR);
  59             entry = KERNEL_LOAD_ADDR;
  60         }
  61         if (kernel_size < 0) {
  62             fprintf(stderr, "qemu: could not load kernel '%s'\n",
  63                     kernel_filename);
  64             exit(1);
  65         }
  66     } else {
  67         entry = 0;
  68     }
  69     env->pc = entry;
  70 }
  71
  72 static QEMUMachine dummy_m68k_machine = {
  73     .name = "dummy",
  74     .desc = "Dummy board",
  75     .init = dummy_m68k_init,
  76     DEFAULT_MACHINE_OPTIONS,
  77 };
  78
  79 static void dummy_m68k_machine_init(void)
  80 {
  81     qemu_register_machine(&dummy_m68k_machine);
  82 }
  83
  84 machine_init(dummy_m68k_machine_init);