hw/misc/debugexit.c

   1 /*
   2  * debug exit port emulation
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License as
   6  * published by the Free Software Foundation; either version 2 or
   7  * (at your option) any later version.
   8  */
   9
  10 #include "qemu/osdep.h"
  11 #include "hw/isa/isa.h"
  12 #include "hw/qdev-properties.h"
  13 #include "qemu/module.h"
  14 #include "qom/object.h"
  15
  16 #define TYPE_ISA_DEBUG_EXIT_DEVICE "isa-debug-exit"
  17 typedef struct ISADebugExitState ISADebugExitState;
  18 DECLARE_INSTANCE_CHECKER(ISADebugExitState, ISA_DEBUG_EXIT_DEVICE,
  19                          TYPE_ISA_DEBUG_EXIT_DEVICE)
  20
  21 struct ISADebugExitState {
  22     ISADevice parent_obj;
  23
  24     uint32_t iobase;
  25     uint32_t iosize;
  26     MemoryRegion io;
  27 };
  28
  29 static uint64_t debug_exit_read(void *opaque, hwaddr addr, unsigned size)
  30 {
  31     return 0;
  32 }
  33
  34 static void debug_exit_write(void *opaque, hwaddr addr, uint64_t val,
  35                              unsigned width)
  36 {
  37     exit((val << 1) | 1);
  38 }
  39
  40 static const MemoryRegionOps debug_exit_ops = {
  41     .read = debug_exit_read,
  42     .write = debug_exit_write,
  43     .valid.min_access_size = 1,
  44     .valid.max_access_size = 4,
  45     .endianness = DEVICE_LITTLE_ENDIAN,
  46 };
  47
  48 static void debug_exit_realizefn(DeviceState *d, Error **errp)
  49 {
  50     ISADevice *dev = ISA_DEVICE(d);
  51     ISADebugExitState *isa = ISA_DEBUG_EXIT_DEVICE(d);
  52
  53     memory_region_init_io(&isa->io, OBJECT(dev), &debug_exit_ops, isa,
  54                           TYPE_ISA_DEBUG_EXIT_DEVICE, isa->iosize);
  55     memory_region_add_subregion(isa_address_space_io(dev),
  56                                 isa->iobase, &isa->io);
  57 }
  58
  59 static Property debug_exit_properties[] = {
  60     DEFINE_PROP_UINT32("iobase", ISADebugExitState, iobase, 0x501),
  61     DEFINE_PROP_UINT32("iosize", ISADebugExitState, iosize, 0x02),
  62     DEFINE_PROP_END_OF_LIST(),
  63 };
  64
  65 static void debug_exit_class_initfn(ObjectClass *klass, void *data)
  66 {
  67     DeviceClass *dc = DEVICE_CLASS(klass);
  68
  69     dc->realize = debug_exit_realizefn;
  70     device_class_set_props(dc, debug_exit_properties);
  71     set_bit(DEVICE_CATEGORY_MISC, dc->categories);
  72 }
  73
  74 static const TypeInfo debug_exit_info = {
  75     .name          = TYPE_ISA_DEBUG_EXIT_DEVICE,
  76     .parent        = TYPE_ISA_DEVICE,
  77     .instance_size = sizeof(ISADebugExitState),
  78     .class_init    = debug_exit_class_initfn,
  79 };
  80
  81 static void debug_exit_register_types(void)
  82 {
  83     type_register_static(&debug_exit_info);
  84 }
  85
  86 type_init(debug_exit_register_types)