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1 /*
2 * QEMU Bochs-style debug console ("port E9") emulation
3 *
4 * Copyright (c) 2003-2004 Fabrice Bellard
5 * Copyright (c) 2008 Citrix Systems, Inc.
6 * Copyright (c) Intel Corporation; author: H. Peter Anvin
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
21 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 * THE SOFTWARE.
25 */
26
27 #include "hw/hw.h"
28 #include "sysemu/char.h"
29 #include "hw/isa/isa.h"
30 #include "hw/i386/pc.h"
31
32 #define TYPE_ISA_DEBUGCON_DEVICE "isa-debugcon"
33 #define ISA_DEBUGCON_DEVICE(obj) \
34 OBJECT_CHECK(ISADebugconState, (obj), TYPE_ISA_DEBUGCON_DEVICE)
35
36 //#define DEBUG_DEBUGCON
37
38 typedef struct DebugconState {
39 MemoryRegion io;
40 CharDriverState *chr;
41 uint32_t readback;
42 } DebugconState;
43
44 typedef struct ISADebugconState {
45 ISADevice parent_obj;
46
47 uint32_t iobase;
48 DebugconState state;
49 } ISADebugconState;
50
51 static void debugcon_ioport_write(void *opaque, hwaddr addr, uint64_t val,
52 unsigned width)
53 {
54 DebugconState *s = opaque;
55 unsigned char ch = val;
56
57 #ifdef DEBUG_DEBUGCON
58 printf(" [debugcon: write addr=0x%04" HWADDR_PRIx " val=0x%02" PRIx64 "]\n", addr, val);
59 #endif
60
61 qemu_chr_fe_write(s->chr, &ch, 1);
62 }
63
64
65 static uint64_t debugcon_ioport_read(void *opaque, hwaddr addr, unsigned width)
66 {
67 DebugconState *s = opaque;
68
69 #ifdef DEBUG_DEBUGCON
70 printf("debugcon: read addr=0x%04" HWADDR_PRIx "\n", addr);
71 #endif
72
73 return s->readback;
74 }
75
76 static const MemoryRegionOps debugcon_ops = {
77 .read = debugcon_ioport_read,
78 .write = debugcon_ioport_write,
79 .valid.min_access_size = 1,
80 .valid.max_access_size = 1,
81 .endianness = DEVICE_LITTLE_ENDIAN,
82 };
83
84 static void debugcon_realize_core(DebugconState *s, Error **errp)
85 {
86 if (!s->chr) {
87 error_setg(errp, "Can't create debugcon device, empty char device");
88 return;
89 }
90
91 qemu_chr_add_handlers(s->chr, NULL, NULL, NULL, s);
92 }
93
94 static void debugcon_isa_realizefn(DeviceState *dev, Error **errp)
95 {
96 ISADevice *d = ISA_DEVICE(dev);
97 ISADebugconState *isa = ISA_DEBUGCON_DEVICE(dev);
98 DebugconState *s = &isa->state;
99 Error *err = NULL;
100
101 debugcon_realize_core(s, &err);
102 if (err != NULL) {
103 error_propagate(errp, err);
104 return;
105 }
106 memory_region_init_io(&s->io, &debugcon_ops, s,
107 TYPE_ISA_DEBUGCON_DEVICE, 1);
108 memory_region_add_subregion(isa_address_space_io(d),
109 isa->iobase, &s->io);
110 }
111
112 static Property debugcon_isa_properties[] = {
113 DEFINE_PROP_HEX32("iobase", ISADebugconState, iobase, 0xe9),
114 DEFINE_PROP_CHR("chardev", ISADebugconState, state.chr),
115 DEFINE_PROP_HEX32("readback", ISADebugconState, state.readback, 0xe9),
116 DEFINE_PROP_END_OF_LIST(),
117 };
118
119 static void debugcon_isa_class_initfn(ObjectClass *klass, void *data)
120 {
121 DeviceClass *dc = DEVICE_CLASS(klass);
122
123 dc->realize = debugcon_isa_realizefn;
124 dc->props = debugcon_isa_properties;
125 }
126
127 static const TypeInfo debugcon_isa_info = {
128 .name = TYPE_ISA_DEBUGCON_DEVICE,
129 .parent = TYPE_ISA_DEVICE,
130 .instance_size = sizeof(ISADebugconState),
131 .class_init = debugcon_isa_class_initfn,
132 };
133
134 static void debugcon_register_types(void)
135 {
136 type_register_static(&debugcon_isa_info);
137 }
138
139 type_init(debugcon_register_types)