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 #include "qom/object.h"
15 #include "sysemu/runstate.h"
16
17 #define TYPE_ISA_DEBUG_EXIT_DEVICE "isa-debug-exit"
18 OBJECT_DECLARE_SIMPLE_TYPE(ISADebugExitState, ISA_DEBUG_EXIT_DEVICE)
19
20 struct ISADebugExitState {
21 ISADevice parent_obj;
22
23 uint32_t iobase;
24 uint32_t iosize;
25 MemoryRegion io;
26 };
27
debug_exit_read(void * opaque,hwaddr addr,unsigned size)28 static uint64_t debug_exit_read(void *opaque, hwaddr addr, unsigned size)
29 {
30 return 0;
31 }
32
debug_exit_write(void * opaque,hwaddr addr,uint64_t val,unsigned width)33 static void debug_exit_write(void *opaque, hwaddr addr, uint64_t val,
34 unsigned width)
35 {
36 qemu_system_shutdown_request_with_code(SHUTDOWN_CAUSE_GUEST_SHUTDOWN,
37 (val << 1) | 1);
38 }
39
40 static const MemoryRegionOps debug_exit_ops = {
41 .read = debug_exit_read,
42 .write = debug_exit_write,
43 .valid.min_access_size = 1,
44 .valid.max_access_size = 4,
45 .endianness = DEVICE_LITTLE_ENDIAN,
46 };
47
debug_exit_realizefn(DeviceState * d,Error ** errp)48 static void debug_exit_realizefn(DeviceState *d, Error **errp)
49 {
50 ISADevice *dev = ISA_DEVICE(d);
51 ISADebugExitState *isa = ISA_DEBUG_EXIT_DEVICE(d);
52
53 memory_region_init_io(&isa->io, OBJECT(dev), &debug_exit_ops, isa,
54 TYPE_ISA_DEBUG_EXIT_DEVICE, isa->iosize);
55 memory_region_add_subregion(isa_address_space_io(dev),
56 isa->iobase, &isa->io);
57 }
58
59 static Property debug_exit_properties[] = {
60 DEFINE_PROP_UINT32("iobase", ISADebugExitState, iobase, 0x501),
61 DEFINE_PROP_UINT32("iosize", ISADebugExitState, iosize, 0x02),
62 DEFINE_PROP_END_OF_LIST(),
63 };
64
debug_exit_class_initfn(ObjectClass * klass,void * data)65 static void debug_exit_class_initfn(ObjectClass *klass, void *data)
66 {
67 DeviceClass *dc = DEVICE_CLASS(klass);
68
69 dc->realize = debug_exit_realizefn;
70 device_class_set_props(dc, debug_exit_properties);
71 set_bit(DEVICE_CATEGORY_MISC, dc->categories);
72 }
73
74 static const TypeInfo debug_exit_info = {
75 .name = TYPE_ISA_DEBUG_EXIT_DEVICE,
76 .parent = TYPE_ISA_DEVICE,
77 .instance_size = sizeof(ISADebugExitState),
78 .class_init = debug_exit_class_initfn,
79 };
80
debug_exit_register_types(void)81 static void debug_exit_register_types(void)
82 {
83 type_register_static(&debug_exit_info);
84 }
85
86 type_init(debug_exit_register_types)
87