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