LXR qemu/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/hw.h"
  12#include "hw/isa/isa.h"
  13
  14#define TYPE_ISA_DEBUG_EXIT_DEVICE "isa-debug-exit"
  15#define ISA_DEBUG_EXIT_DEVICE(obj) \
  16     OBJECT_CHECK(ISADebugExitState, (obj), TYPE_ISA_DEBUG_EXIT_DEVICE)
  17
  18typedef struct ISADebugExitState {
  19    ISADevice parent_obj;
  20
  21    uint32_t iobase;
  22    uint32_t iosize;
  23    MemoryRegion io;
  24} ISADebugExitState;
  25
  26static uint64_t debug_exit_read(void *opaque, hwaddr addr, unsigned size)
  27{
  28    return 0;
  29}
  30
  31static void debug_exit_write(void *opaque, hwaddr addr, uint64_t val,
  32                             unsigned width)
  33{
  34    exit((val << 1) | 1);
  35}
  36
  37static const MemoryRegionOps debug_exit_ops = {
  38    .read = debug_exit_read,
  39    .write = debug_exit_write,
  40    .valid.min_access_size = 1,
  41    .valid.max_access_size = 4,
  42    .endianness = DEVICE_LITTLE_ENDIAN,
  43};
  44
  45static void debug_exit_realizefn(DeviceState *d, Error **errp)
  46{
  47    ISADevice *dev = ISA_DEVICE(d);
  48    ISADebugExitState *isa = ISA_DEBUG_EXIT_DEVICE(d);
  49
  50    memory_region_init_io(&isa->io, OBJECT(dev), &debug_exit_ops, isa,
  51                          TYPE_ISA_DEBUG_EXIT_DEVICE, isa->iosize);
  52    memory_region_add_subregion(isa_address_space_io(dev),
  53                                isa->iobase, &isa->io);
  54}
  55
  56static Property debug_exit_properties[] = {
  57    DEFINE_PROP_UINT32("iobase", ISADebugExitState, iobase, 0x501),
  58    DEFINE_PROP_UINT32("iosize", ISADebugExitState, iosize, 0x02),
  59    DEFINE_PROP_END_OF_LIST(),
  60};
  61
  62static void debug_exit_class_initfn(ObjectClass *klass, void *data)
  63{
  64    DeviceClass *dc = DEVICE_CLASS(klass);
  65
  66    dc->realize = debug_exit_realizefn;
  67    dc->props = debug_exit_properties;
  68    set_bit(DEVICE_CATEGORY_MISC, dc->categories);
  69}
  70
  71static const TypeInfo debug_exit_info = {
  72    .name          = TYPE_ISA_DEBUG_EXIT_DEVICE,
  73    .parent        = TYPE_ISA_DEVICE,
  74    .instance_size = sizeof(ISADebugExitState),
  75    .class_init    = debug_exit_class_initfn,
  76};
  77
  78static void debug_exit_register_types(void)
  79{
  80    type_register_static(&debug_exit_info);
  81}
  82
  83type_init(debug_exit_register_types)
  84