jcs.org
qemu with hax to log dma reads & writes
jcs.org/2018/11/12/vfio
1/*
2 * Arm PrimeCell PL050 Keyboard / Mouse Interface
3 *
4 * Copyright (c) 2006-2007 CodeSourcery.
5 * Written by Paul Brook
6 *
7 * This code is licensed under the GPL.
8 */
9
10#include "qemu/osdep.h"
11#include "hw/sysbus.h"
12#include "migration/vmstate.h"
13#include "hw/input/ps2.h"
14#include "hw/irq.h"
15#include "qemu/log.h"
16#include "qemu/module.h"
17
18#define TYPE_PL050 "pl050"
19#define PL050(obj) OBJECT_CHECK(PL050State, (obj), TYPE_PL050)
20
21typedef struct PL050State {
22 SysBusDevice parent_obj;
23
24 MemoryRegion iomem;
25 void *dev;
26 uint32_t cr;
27 uint32_t clk;
28 uint32_t last;
29 int pending;
30 qemu_irq irq;
31 bool is_mouse;
32} PL050State;
33
34static const VMStateDescription vmstate_pl050 = {
35 .name = "pl050",
36 .version_id = 2,
37 .minimum_version_id = 2,
38 .fields = (VMStateField[]) {
39 VMSTATE_UINT32(cr, PL050State),
40 VMSTATE_UINT32(clk, PL050State),
41 VMSTATE_UINT32(last, PL050State),
42 VMSTATE_INT32(pending, PL050State),
43 VMSTATE_END_OF_LIST()
44 }
45};
46
47#define PL050_TXEMPTY (1 << 6)
48#define PL050_TXBUSY (1 << 5)
49#define PL050_RXFULL (1 << 4)
50#define PL050_RXBUSY (1 << 3)
51#define PL050_RXPARITY (1 << 2)
52#define PL050_KMIC (1 << 1)
53#define PL050_KMID (1 << 0)
54
55static const unsigned char pl050_id[] =
56{ 0x50, 0x10, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };
57
58static void pl050_update(void *opaque, int level)
59{
60 PL050State *s = (PL050State *)opaque;
61 int raise;
62
63 s->pending = level;
64 raise = (s->pending && (s->cr & 0x10) != 0)
65 || (s->cr & 0x08) != 0;
66 qemu_set_irq(s->irq, raise);
67}
68
69static uint64_t pl050_read(void *opaque, hwaddr offset,
70 unsigned size)
71{
72 PL050State *s = (PL050State *)opaque;
73 if (offset >= 0xfe0 && offset < 0x1000)
74 return pl050_id[(offset - 0xfe0) >> 2];
75
76 switch (offset >> 2) {
77 case 0: /* KMICR */
78 return s->cr;
79 case 1: /* KMISTAT */
80 {
81 uint8_t val;
82 uint32_t stat;
83
84 val = s->last;
85 val = val ^ (val >> 4);
86 val = val ^ (val >> 2);
87 val = (val ^ (val >> 1)) & 1;
88
89 stat = PL050_TXEMPTY;
90 if (val)
91 stat |= PL050_RXPARITY;
92 if (s->pending)
93 stat |= PL050_RXFULL;
94
95 return stat;
96 }
97 case 2: /* KMIDATA */
98 if (s->pending)
99 s->last = ps2_read_data(s->dev);
100 return s->last;
101 case 3: /* KMICLKDIV */
102 return s->clk;
103 case 4: /* KMIIR */
104 return s->pending | 2;
105 default:
106 qemu_log_mask(LOG_GUEST_ERROR,
107 "pl050_read: Bad offset %x\n", (int)offset);
108 return 0;
109 }
110}
111
112static void pl050_write(void *opaque, hwaddr offset,
113 uint64_t value, unsigned size)
114{
115 PL050State *s = (PL050State *)opaque;
116 switch (offset >> 2) {
117 case 0: /* KMICR */
118 s->cr = value;
119 pl050_update(s, s->pending);
120 /* ??? Need to implement the enable/disable bit. */
121 break;
122 case 2: /* KMIDATA */
123 /* ??? This should toggle the TX interrupt line. */
124 /* ??? This means kbd/mouse can block each other. */
125 if (s->is_mouse) {
126 ps2_write_mouse(s->dev, value);
127 } else {
128 ps2_write_keyboard(s->dev, value);
129 }
130 break;
131 case 3: /* KMICLKDIV */
132 s->clk = value;
133 return;
134 default:
135 qemu_log_mask(LOG_GUEST_ERROR,
136 "pl050_write: Bad offset %x\n", (int)offset);
137 }
138}
139static const MemoryRegionOps pl050_ops = {
140 .read = pl050_read,
141 .write = pl050_write,
142 .endianness = DEVICE_NATIVE_ENDIAN,
143};
144
145static void pl050_realize(DeviceState *dev, Error **errp)
146{
147 PL050State *s = PL050(dev);
148 SysBusDevice *sbd = SYS_BUS_DEVICE(dev);
149
150 memory_region_init_io(&s->iomem, OBJECT(s), &pl050_ops, s, "pl050", 0x1000);
151 sysbus_init_mmio(sbd, &s->iomem);
152 sysbus_init_irq(sbd, &s->irq);
153 if (s->is_mouse) {
154 s->dev = ps2_mouse_init(pl050_update, s);
155 } else {
156 s->dev = ps2_kbd_init(pl050_update, s);
157 }
158}
159
160static void pl050_keyboard_init(Object *obj)
161{
162 PL050State *s = PL050(obj);
163
164 s->is_mouse = false;
165}
166
167static void pl050_mouse_init(Object *obj)
168{
169 PL050State *s = PL050(obj);
170
171 s->is_mouse = true;
172}
173
174static const TypeInfo pl050_kbd_info = {
175 .name = "pl050_keyboard",
176 .parent = TYPE_PL050,
177 .instance_init = pl050_keyboard_init,
178};
179
180static const TypeInfo pl050_mouse_info = {
181 .name = "pl050_mouse",
182 .parent = TYPE_PL050,
183 .instance_init = pl050_mouse_init,
184};
185
186static void pl050_class_init(ObjectClass *oc, void *data)
187{
188 DeviceClass *dc = DEVICE_CLASS(oc);
189
190 dc->realize = pl050_realize;
191 dc->vmsd = &vmstate_pl050;
192}
193
194static const TypeInfo pl050_type_info = {
195 .name = TYPE_PL050,
196 .parent = TYPE_SYS_BUS_DEVICE,
197 .instance_size = sizeof(PL050State),
198 .abstract = true,
199 .class_init = pl050_class_init,
200};
201
202static void pl050_register_types(void)
203{
204 type_register_static(&pl050_type_info);
205 type_register_static(&pl050_kbd_info);
206 type_register_static(&pl050_mouse_info);
207}
208
209type_init(pl050_register_types)