1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
|
#include "hw.h"
#include "mips.h"
#include "net.h"
#include "isa.h"
//#define DEBUG_MIPSNET_SEND
//#define DEBUG_MIPSNET_RECEIVE
//#define DEBUG_MIPSNET_DATA
//#define DEBUG_MIPSNET_IRQ
/* MIPSnet register offsets */
#define MIPSNET_DEV_ID 0x00
#define MIPSNET_BUSY 0x08
#define MIPSNET_RX_DATA_COUNT 0x0c
#define MIPSNET_TX_DATA_COUNT 0x10
#define MIPSNET_INT_CTL 0x14
# define MIPSNET_INTCTL_TXDONE 0x00000001
# define MIPSNET_INTCTL_RXDONE 0x00000002
# define MIPSNET_INTCTL_TESTBIT 0x80000000
#define MIPSNET_INTERRUPT_INFO 0x18
#define MIPSNET_RX_DATA_BUFFER 0x1c
#define MIPSNET_TX_DATA_BUFFER 0x20
#define MAX_ETH_FRAME_SIZE 1514
typedef struct MIPSnetState {
uint32_t busy;
uint32_t rx_count;
uint32_t rx_read;
uint32_t tx_count;
uint32_t tx_written;
uint32_t intctl;
uint8_t rx_buffer[MAX_ETH_FRAME_SIZE];
uint8_t tx_buffer[MAX_ETH_FRAME_SIZE];
qemu_irq irq;
VLANClientState *vc;
} MIPSnetState;
static void mipsnet_reset(MIPSnetState *s)
{
s->busy = 1;
s->rx_count = 0;
s->rx_read = 0;
s->tx_count = 0;
s->tx_written = 0;
s->intctl = 0;
memset(s->rx_buffer, 0, MAX_ETH_FRAME_SIZE);
memset(s->tx_buffer, 0, MAX_ETH_FRAME_SIZE);
}
static void mipsnet_update_irq(MIPSnetState *s)
{
int isr = !!s->intctl;
#ifdef DEBUG_MIPSNET_IRQ
printf("mipsnet: Set IRQ to %d (%02x)\n", isr, s->intctl);
#endif
qemu_set_irq(s->irq, isr);
}
static int mipsnet_buffer_full(MIPSnetState *s)
{
if (s->rx_count >= MAX_ETH_FRAME_SIZE)
return 1;
return 0;
}
static int mipsnet_can_receive(void *opaque)
{
MIPSnetState *s = opaque;
if (s->busy)
return 0;
return !mipsnet_buffer_full(s);
}
static void mipsnet_receive(void *opaque, const uint8_t *buf, int size)
{
MIPSnetState *s = opaque;
#ifdef DEBUG_MIPSNET_RECEIVE
printf("mipsnet: receiving len=%d\n", size);
#endif
if (!mipsnet_can_receive(opaque))
return;
s->busy = 1;
/* Just accept everything. */
/* Write packet data. */
memcpy(s->rx_buffer, buf, size);
s->rx_count = size;
s->rx_read = 0;
/* Now we can signal we have received something. */
s->intctl |= MIPSNET_INTCTL_RXDONE;
mipsnet_update_irq(s);
}
static uint32_t mipsnet_ioport_read(void *opaque, uint32_t addr)
{
MIPSnetState *s = opaque;
int ret = 0;
addr &= 0x3f;
switch (addr) {
case MIPSNET_DEV_ID:
ret = be32_to_cpu(0x4d495053); /* MIPS */
break;
case MIPSNET_DEV_ID + 4:
ret = be32_to_cpu(0x4e455430); /* NET0 */
break;
case MIPSNET_BUSY:
ret = s->busy;
break;
case MIPSNET_RX_DATA_COUNT:
ret = s->rx_count;
break;
case MIPSNET_TX_DATA_COUNT:
ret = s->tx_count;
break;
case MIPSNET_INT_CTL:
ret = s->intctl;
s->intctl &= ~MIPSNET_INTCTL_TESTBIT;
break;
case MIPSNET_INTERRUPT_INFO:
/* XXX: This seems to be a per-VPE interrupt number. */
ret = 0;
break;
case MIPSNET_RX_DATA_BUFFER:
if (s->rx_count) {
s->rx_count--;
ret = s->rx_buffer[s->rx_read++];
}
break;
/* Reads as zero. */
case MIPSNET_TX_DATA_BUFFER:
default:
break;
}
#ifdef DEBUG_MIPSNET_DATA
printf("mipsnet: read addr=0x%02x val=0x%02x\n", addr, ret);
#endif
return ret;
}
static void mipsnet_ioport_write(void *opaque, uint32_t addr, uint32_t val)
{
MIPSnetState *s = opaque;
addr &= 0x3f;
#ifdef DEBUG_MIPSNET_DATA
printf("mipsnet: write addr=0x%02x val=0x%02x\n", addr, val);
#endif
switch (addr) {
case MIPSNET_TX_DATA_COUNT:
s->tx_count = (val <= MAX_ETH_FRAME_SIZE) ? val : 0;
s->tx_written = 0;
break;
case MIPSNET_INT_CTL:
if (val & MIPSNET_INTCTL_TXDONE) {
s->intctl &= ~MIPSNET_INTCTL_TXDONE;
} else if (val & MIPSNET_INTCTL_RXDONE) {
s->intctl &= ~MIPSNET_INTCTL_RXDONE;
} else if (val & MIPSNET_INTCTL_TESTBIT) {
mipsnet_reset(s);
s->intctl |= MIPSNET_INTCTL_TESTBIT;
} else if (!val) {
/* ACK testbit interrupt, flag was cleared on read. */
}
s->busy = !!s->intctl;
mipsnet_update_irq(s);
break;
case MIPSNET_TX_DATA_BUFFER:
s->tx_buffer[s->tx_written++] = val;
if (s->tx_written == s->tx_count) {
/* Send buffer. */
#ifdef DEBUG_MIPSNET_SEND
printf("mipsnet: sending len=%d\n", s->tx_count);
#endif
qemu_send_packet(s->vc, s->tx_buffer, s->tx_count);
s->tx_count = s->tx_written = 0;
s->intctl |= MIPSNET_INTCTL_TXDONE;
s->busy = 1;
mipsnet_update_irq(s);
}
break;
/* Read-only registers */
case MIPSNET_DEV_ID:
case MIPSNET_BUSY:
case MIPSNET_RX_DATA_COUNT:
case MIPSNET_INTERRUPT_INFO:
case MIPSNET_RX_DATA_BUFFER:
default:
break;
}
}
static void mipsnet_save(QEMUFile *f, void *opaque)
{
MIPSnetState *s = opaque;
qemu_put_be32s(f, &s->busy);
qemu_put_be32s(f, &s->rx_count);
qemu_put_be32s(f, &s->rx_read);
qemu_put_be32s(f, &s->tx_count);
qemu_put_be32s(f, &s->tx_written);
qemu_put_be32s(f, &s->intctl);
qemu_put_buffer(f, s->rx_buffer, MAX_ETH_FRAME_SIZE);
qemu_put_buffer(f, s->tx_buffer, MAX_ETH_FRAME_SIZE);
}
static int mipsnet_load(QEMUFile *f, void *opaque, int version_id)
{
MIPSnetState *s = opaque;
if (version_id > 0)
return -EINVAL;
qemu_get_be32s(f, &s->busy);
qemu_get_be32s(f, &s->rx_count);
qemu_get_be32s(f, &s->rx_read);
qemu_get_be32s(f, &s->tx_count);
qemu_get_be32s(f, &s->tx_written);
qemu_get_be32s(f, &s->intctl);
qemu_get_buffer(f, s->rx_buffer, MAX_ETH_FRAME_SIZE);
qemu_get_buffer(f, s->tx_buffer, MAX_ETH_FRAME_SIZE);
return 0;
}
void mipsnet_init (int base, qemu_irq irq, NICInfo *nd)
{
MIPSnetState *s;
qemu_check_nic_model(nd, "mipsnet");
s = qemu_mallocz(sizeof(MIPSnetState));
register_ioport_write(base, 36, 1, mipsnet_ioport_write, s);
register_ioport_read(base, 36, 1, mipsnet_ioport_read, s);
register_ioport_write(base, 36, 2, mipsnet_ioport_write, s);
register_ioport_read(base, 36, 2, mipsnet_ioport_read, s);
register_ioport_write(base, 36, 4, mipsnet_ioport_write, s);
register_ioport_read(base, 36, 4, mipsnet_ioport_read, s);
s->irq = irq;
if (nd && nd->vlan) {
s->vc = qemu_new_vlan_client(nd->vlan, nd->model, nd->name,
mipsnet_receive, mipsnet_can_receive, s);
} else {
s->vc = NULL;
}
qemu_format_nic_info_str(s->vc, nd->macaddr);
mipsnet_reset(s);
register_savevm("mipsnet", 0, 0, mipsnet_save, mipsnet_load, s);
}
|
