-
Notifications
You must be signed in to change notification settings - Fork 620
/
mailbox.c
292 lines (228 loc) · 7.25 KB
/
mailbox.c
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
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
/*
Copyright (c) 2012, Broadcom Europe Ltd.
Copyright (c) 2016, Jeremy Garff
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
* Neither the name of the copyright holder nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <assert.h>
#include <stdint.h>
#include <errno.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/ioctl.h>
#include <sys/sysmacros.h>
#include <sys/stat.h>
#include "mailbox.h"
void *mapmem(uint32_t base, uint32_t size, const char *mem_dev) {
uint32_t pagemask = ~0UL ^ (getpagesize() - 1);
uint32_t offsetmask = getpagesize() - 1;
int mem_fd;
void *mem;
mem_fd = open(mem_dev, O_RDWR | O_SYNC);
if (mem_fd < 0) {
perror("Can't open /dev/mem");
return NULL;
}
mem = mmap(0, size, PROT_READ|PROT_WRITE, MAP_SHARED, mem_fd, base & pagemask);
if (mem == MAP_FAILED) {
perror("mmap error\n");
return NULL;
}
close(mem_fd);
return (char *)mem + (base & offsetmask);
}
void *unmapmem(void *addr, uint32_t size) {
uint32_t pagemask = ~0UL ^ (getpagesize() - 1);
uintptr_t baseaddr = (uintptr_t)addr & pagemask;
int s;
s = munmap((void *)baseaddr, size);
if (s != 0) {
perror("munmap error\n");
}
return NULL;
}
/*
* use ioctl to send mbox property message
*/
static int mbox_property(int file_desc, void *buf) {
int fd = file_desc;
int ret_val = -1;
if (fd < 0) {
fd = mbox_open();
}
if (fd >= 0) {
ret_val = ioctl(fd, IOCTL_MBOX_PROPERTY, buf);
if (ret_val < 0) {
perror("ioctl_set_msg failed\n");
}
}
if (file_desc < 0) {
mbox_close(fd);
}
return ret_val;
}
uint32_t mem_alloc(int file_desc, uint32_t size, uint32_t align, uint32_t flags) {
int i=0;
uint32_t p[32];
p[i++] = 0; // size
p[i++] = 0x00000000; // process request
p[i++] = 0x3000c; // (the tag id)
p[i++] = 12; // (size of the buffer)
p[i++] = 12; // (size of the data)
p[i++] = size; // (num bytes? or pages?)
p[i++] = align; // (alignment)
p[i++] = flags; // (MEM_FLAG_L1_NONALLOCATING)
p[i++] = 0x00000000; // end tag
p[0] = i*sizeof *p; // actual size
if (mbox_property(file_desc, p) < 0)
return 0;
else
return p[5];
}
uint32_t mem_free(int file_desc, uint32_t handle) {
int i=0;
uint32_t p[32];
p[i++] = 0; // size
p[i++] = 0x00000000; // process request
p[i++] = 0x3000f; // (the tag id)
p[i++] = 4; // (size of the buffer)
p[i++] = 4; // (size of the data)
p[i++] = handle;
p[i++] = 0x00000000; // end tag
p[0] = i*sizeof *p; // actual size
mbox_property(file_desc, p);
return p[5];
}
uint32_t mem_lock(int file_desc, uint32_t handle) {
int i=0;
uint32_t p[32];
p[i++] = 0; // size
p[i++] = 0x00000000; // process request
p[i++] = 0x3000d; // (the tag id)
p[i++] = 4; // (size of the buffer)
p[i++] = 4; // (size of the data)
p[i++] = handle;
p[i++] = 0x00000000; // end tag
p[0] = i*sizeof *p; // actual size
if (mbox_property(file_desc, p) < 0)
return ~0;
else
return p[5];
}
uint32_t mem_unlock(int file_desc, uint32_t handle) {
int i=0;
uint32_t p[32];
p[i++] = 0; // size
p[i++] = 0x00000000; // process request
p[i++] = 0x3000e; // (the tag id)
p[i++] = 4; // (size of the buffer)
p[i++] = 4; // (size of the data)
p[i++] = handle;
p[i++] = 0x00000000; // end tag
p[0] = i * sizeof(*p); // actual size
mbox_property(file_desc, p);
return p[5];
}
uint32_t execute_code(int file_desc, uint32_t code, uint32_t r0, uint32_t r1,
uint32_t r2, uint32_t r3, uint32_t r4, uint32_t r5) {
int i=0;
uint32_t p[32];
p[i++] = 0; // size
p[i++] = 0x00000000; // process request
p[i++] = 0x30010; // (the tag id)
p[i++] = 28; // (size of the buffer)
p[i++] = 28; // (size of the data)
p[i++] = code;
p[i++] = r0;
p[i++] = r1;
p[i++] = r2;
p[i++] = r3;
p[i++] = r4;
p[i++] = r5;
p[i++] = 0x00000000; // end tag
p[0] = i * sizeof(*p); // actual size
mbox_property(file_desc, p);
return p[5];
}
uint32_t qpu_enable(int file_desc, uint32_t enable) {
int i=0;
uint32_t p[32];
p[i++] = 0; // size
p[i++] = 0x00000000; // process request
p[i++] = 0x30012; // (the tag id)
p[i++] = 4; // (size of the buffer)
p[i++] = 4; // (size of the data)
p[i++] = enable;
p[i++] = 0x00000000; // end tag
p[0] = i * sizeof(*p); // actual size
mbox_property(file_desc, p);
return p[5];
}
uint32_t execute_qpu(int file_desc, uint32_t num_qpus, uint32_t control,
uint32_t noflush, uint32_t timeout) {
int i = 0;
uint32_t p[32];
p[i++] = 0; // size
p[i++] = 0x00000000; // process request
p[i++] = 0x30011; // (the tag id)
p[i++] = 16; // (size of the buffer)
p[i++] = 16; // (size of the data)
p[i++] = num_qpus;
p[i++] = control;
p[i++] = noflush;
p[i++] = timeout; // ms
p[i++] = 0x00000000; // end tag
p[0] = i * sizeof(*p); // actual size
mbox_property(file_desc, p);
return p[5];
}
int mbox_open(void) {
int file_desc;
char filename[64];
file_desc = open("/dev/vcio", 0);
if (file_desc >= 0) {
return file_desc;
}
// open a char device file used for communicating with kernel mbox driver
sprintf(filename, "/tmp/mailbox-%d", getpid());
unlink(filename);
if (mknod(filename, S_IFCHR|0600, makedev(100, 0)) < 0) {
perror("Failed to create mailbox device\n");
return -1;
}
file_desc = open(filename, 0);
if (file_desc < 0) {
perror("Can't open device file\n");
unlink(filename);
return -1;
}
unlink(filename);
return file_desc;
}
void mbox_close(int file_desc) {
close(file_desc);
}