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