qemu/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 "hw/hw.h"
  10 #include "hw/boards.h"
  11 #include "hw/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(MachineState *machine)
  20 {
  21     ram_addr_t ram_size = machine->ram_size;
  22     const char *cpu_model = machine->cpu_model;
  23     const char *kernel_filename = machine->kernel_filename;
  24     M68kCPU *cpu;
  25     CPUM68KState *env;
  26     MemoryRegion *address_space_mem =  get_system_memory();
  27     MemoryRegion *ram = g_new(MemoryRegion, 1);
  28     int kernel_size;
  29     uint64_t elf_entry;
  30     hwaddr entry;
  31
  32     if (!cpu_model)
  33         cpu_model = "cfv4e";
  34     cpu = cpu_m68k_init(cpu_model);
  35     if (!cpu) {
  36         fprintf(stderr, "Unable to find m68k CPU definition\n");
  37         exit(1);
  38     }
  39     env = &cpu->env;
  40
  41     /* Initialize CPU registers.  */
  42     env->vbr = 0;
  43
  44     /* RAM at address zero */
  45     memory_region_allocate_system_memory(ram, NULL, "dummy_m68k.ram",
  46                                          ram_size);
  47     memory_region_add_subregion(address_space_mem, 0, ram);
  48
  49     /* Load kernel.  */
  50     if (kernel_filename) {
  51         kernel_size = load_elf(kernel_filename, NULL, NULL, &elf_entry,
  52                                NULL, NULL, 1, ELF_MACHINE, 0);
  53         entry = elf_entry;
  54         if (kernel_size < 0) {
  55             kernel_size = load_uimage(kernel_filename, &entry, NULL, NULL,
  56                                       NULL, NULL);
  57         }
  58         if (kernel_size < 0) {
  59             kernel_size = load_image_targphys(kernel_filename,
  60                                               KERNEL_LOAD_ADDR,
  61                                               ram_size - KERNEL_LOAD_ADDR);
  62             entry = KERNEL_LOAD_ADDR;
  63         }
  64         if (kernel_size < 0) {
  65             fprintf(stderr, "qemu: could not load kernel '%s'\n",
  66                     kernel_filename);
  67             exit(1);
  68         }
  69     } else {
  70         entry = 0;
  71     }
  72     env->pc = entry;
  73 }
  74
  75 static QEMUMachine dummy_m68k_machine = {
  76     .name = "dummy",
  77     .desc = "Dummy board",
  78     .init = dummy_m68k_init,
  79 };
  80
  81 static void dummy_m68k_machine_init(void)
  82 {
  83     qemu_register_machine(&dummy_m68k_machine);
  84 }
  85
  86 machine_init(dummy_m68k_machine_init);