xref: /illumos-kvm-cmd/hw/debugcon.c (revision 68396ea9)
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.h"
28 #include "qemu-char.h"
29 #include "isa.h"
30 #include "pc.h"
31 
32 //#define DEBUG_DEBUGCON
33 
34 typedef struct DebugconState {
35     CharDriverState *chr;
36     uint32_t readback;
37 } DebugconState;
38 
39 typedef struct ISADebugconState {
40     ISADevice dev;
41     uint32_t iobase;
42     DebugconState state;
43 } ISADebugconState;
44 
debugcon_ioport_write(void * opaque,uint32_t addr,uint32_t val)45 static void debugcon_ioport_write(void *opaque, uint32_t addr, uint32_t val)
46 {
47     DebugconState *s = opaque;
48     unsigned char ch = val;
49 
50 #ifdef DEBUG_DEBUGCON
51     printf("debugcon: write addr=0x%04x val=0x%02x\n", addr, val);
52 #endif
53 
54     qemu_chr_write(s->chr, &ch, 1);
55 }
56 
57 
debugcon_ioport_read(void * opaque,uint32_t addr)58 static uint32_t debugcon_ioport_read(void *opaque, uint32_t addr)
59 {
60     DebugconState *s = opaque;
61 
62 #ifdef DEBUG_DEBUGCON
63     printf("debugcon: read addr=0x%04x\n", addr);
64 #endif
65 
66     return s->readback;
67 }
68 
debugcon_init_core(DebugconState * s)69 static void debugcon_init_core(DebugconState *s)
70 {
71     if (!s->chr) {
72         fprintf(stderr, "Can't create debugcon device, empty char device\n");
73         exit(1);
74     }
75 
76     qemu_chr_add_handlers(s->chr, NULL, NULL, NULL, s);
77 }
78 
debugcon_isa_initfn(ISADevice * dev)79 static int debugcon_isa_initfn(ISADevice *dev)
80 {
81     ISADebugconState *isa = DO_UPCAST(ISADebugconState, dev, dev);
82     DebugconState *s = &isa->state;
83 
84     debugcon_init_core(s);
85     register_ioport_write(isa->iobase, 1, 1, debugcon_ioport_write, s);
86     register_ioport_read(isa->iobase, 1, 1, debugcon_ioport_read, s);
87     return 0;
88 }
89 
90 static ISADeviceInfo debugcon_isa_info = {
91     .qdev.name  = "isa-debugcon",
92     .qdev.size  = sizeof(ISADebugconState),
93     .init       = debugcon_isa_initfn,
94     .qdev.props = (Property[]) {
95         DEFINE_PROP_HEX32("iobase", ISADebugconState, iobase, 0xe9),
96         DEFINE_PROP_CHR("chardev",  ISADebugconState, state.chr),
97         DEFINE_PROP_HEX32("readback", ISADebugconState, state.readback, 0xe9),
98         DEFINE_PROP_END_OF_LIST(),
99     },
100 };
101 
debugcon_register_devices(void)102 static void debugcon_register_devices(void)
103 {
104     isa_qdev_register(&debugcon_isa_info);
105 }
106 
107 device_init(debugcon_register_devices)
108