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 "qemu-common.h"
  11 #include "cpu.h"
  12 #include "hw/hw.h"
  13 #include "hw/boards.h"
  14 #include "hw/loader.h"
  15 #include "elf.h"
  16 #include "exec/address-spaces.h"
  17
  18 #define KERNEL_LOAD_ADDR 0x10000
  19
  20 /* Board init.  */
  21
  22 static void dummy_m68k_init(MachineState *machine)
  23 {
  24     ram_addr_t ram_size = machine->ram_size;
  25     const char *cpu_model = machine->cpu_model;
  26     const char *kernel_filename = machine->kernel_filename;
  27     M68kCPU *cpu;
  28     CPUM68KState *env;
  29     MemoryRegion *address_space_mem =  get_system_memory();
  30     MemoryRegion *ram = g_new(MemoryRegion, 1);
  31     int kernel_size;
  32     uint64_t elf_entry;
  33     hwaddr entry;
  34
  35     if (!cpu_model)
  36         cpu_model = "cfv4e";
  37     cpu = cpu_m68k_init(cpu_model);
  38     if (!cpu) {
  39         fprintf(stderr, "Unable to find m68k CPU definition\n");
  40         exit(1);
  41     }
  42     env = &cpu->env;
  43
  44     /* Initialize CPU registers.  */
  45     env->vbr = 0;
  46
  47     /* RAM at address zero */
  48     memory_region_allocate_system_memory(ram, NULL, "dummy_m68k.ram",
  49                                          ram_size);
  50     memory_region_add_subregion(address_space_mem, 0, ram);
  51
  52     /* Load kernel.  */
  53     if (kernel_filename) {
  54         kernel_size = load_elf(kernel_filename, NULL, NULL, &elf_entry,
  55                                NULL, NULL, 1, EM_68K, 0, 0);
  56         entry = elf_entry;
  57         if (kernel_size < 0) {
  58             kernel_size = load_uimage(kernel_filename, &entry, NULL, NULL,
  59                                       NULL, NULL);
  60         }
  61         if (kernel_size < 0) {
  62             kernel_size = load_image_targphys(kernel_filename,
  63                                               KERNEL_LOAD_ADDR,
  64                                               ram_size - KERNEL_LOAD_ADDR);
  65             entry = KERNEL_LOAD_ADDR;
  66         }
  67         if (kernel_size < 0) {
  68             fprintf(stderr, "qemu: could not load kernel '%s'\n",
  69                     kernel_filename);
  70             exit(1);
  71         }
  72     } else {
  73         entry = 0;
  74     }
  75     env->pc = entry;
  76 }
  77
  78 static void dummy_m68k_machine_init(MachineClass *mc)
  79 {
  80     mc->desc = "Dummy board";
  81     mc->init = dummy_m68k_init;
  82 }
  83
  84 DEFINE_MACHINE("dummy", dummy_m68k_machine_init)