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 uint64_t debug_exit_read(void *opaque, hwaddr addr, unsigned size)
  27 {
  28     return 0;
  29 }
  30
  31 static void debug_exit_write(void *opaque, hwaddr addr, uint64_t val,
  32                              unsigned width)
  33 {
  34     exit((val << 1) | 1);
  35 }
  36
  37 static 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
  45 static 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
  56 static 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
  62 static 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
  71 static 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
  78 static void debug_exit_register_types(void)
  79 {
  80     type_register_static(&debug_exit_info);
  81 }
  82
  83 type_init(debug_exit_register_types)