hw/m68k/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 "qemu/osdep.h"
  10 #include "hw/hw.h"
  11 #include "hw/boards.h"
  12 #include "hw/loader.h"
  13 #include "elf.h"
  14 #include "exec/address-spaces.h"
  15
  16 #define KERNEL_LOAD_ADDR 0x10000
  17
  18 /* Board init.  */
  19
  20 static void dummy_m68k_init(MachineState *machine)
  21 {
  22     ram_addr_t ram_size = machine->ram_size;
  23     const char *cpu_model = machine->cpu_model;
  24     const char *kernel_filename = machine->kernel_filename;
  25     M68kCPU *cpu;
  26     CPUM68KState *env;
  27     MemoryRegion *address_space_mem =  get_system_memory();
  28     MemoryRegion *ram = g_new(MemoryRegion, 1);
  29     int kernel_size;
  30     uint64_t elf_entry;
  31     hwaddr entry;
  32
  33     if (!cpu_model)
  34         cpu_model = "cfv4e";
  35     cpu = cpu_m68k_init(cpu_model);
  36     if (!cpu) {
  37         fprintf(stderr, "Unable to find m68k CPU definition\n");
  38         exit(1);
  39     }
  40     env = &cpu->env;
  41
  42     /* Initialize CPU registers.  */
  43     env->vbr = 0;
  44
  45     /* RAM at address zero */
  46     memory_region_allocate_system_memory(ram, NULL, "dummy_m68k.ram",
  47                                          ram_size);
  48     memory_region_add_subregion(address_space_mem, 0, ram);
  49
  50     /* Load kernel.  */
  51     if (kernel_filename) {
  52         kernel_size = load_elf(kernel_filename, NULL, NULL, &elf_entry,
  53                                NULL, NULL, 1, EM_68K, 0, 0);
  54         entry = elf_entry;
  55         if (kernel_size < 0) {
  56             kernel_size = load_uimage(kernel_filename, &entry, NULL, NULL,
  57                                       NULL, NULL);
  58         }
  59         if (kernel_size < 0) {
  60             kernel_size = load_image_targphys(kernel_filename,
  61                                               KERNEL_LOAD_ADDR,
  62                                               ram_size - KERNEL_LOAD_ADDR);
  63             entry = KERNEL_LOAD_ADDR;
  64         }
  65         if (kernel_size < 0) {
  66             fprintf(stderr, "qemu: could not load kernel '%s'\n",
  67                     kernel_filename);
  68             exit(1);
  69         }
  70     } else {
  71         entry = 0;
  72     }
  73     env->pc = entry;
  74 }
  75
  76 static void dummy_m68k_machine_init(MachineClass *mc)
  77 {
  78     mc->desc = "Dummy board";
  79     mc->init = dummy_m68k_init;
  80 }
  81
  82 DEFINE_MACHINE("dummy", dummy_m68k_machine_init)