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