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
|
/*
* Copyright (c) 2012, ARM Limited. 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 ARM nor the names of its
* contributors may be used to endorse or promote products
* derived from this software without specific prior written
* permission.
*/
#include "events.h"
/*
* Set the specified event for that cpu.
*/
void _set_event(unsigned event_id, unsigned cpu_id, unsigned event_type)
{
dsb();
secure_event[cpu_id][event_id] = TRUE;
dsb();
sev();
return;
}
inline unsigned _get_event(unsigned event_id, unsigned cpu_id)
{
return secure_event[cpu_id][event_id];
}
void _reset_event(unsigned event_id, unsigned cpu_id, unsigned event_type)
{
dsb();
secure_event[cpu_id][event_id] = FALSE;
dsb();
return;
}
void _wait_for_event(unsigned event_id, unsigned cpu_id, unsigned event_type)
{
dsb();
do {
wfe();
isb();
dsb();
} while (FALSE == _get_event(event_id, cpu_id));
return;
}
/*
* Wait for events from each core. Its a little trickier than
* waiting for a single event. The event register as per the
* architecture is just a single bit to flag an event rather
* than the number of events. If multiple events are sent by
* the time we enter wfe() then each flag variable should be
* checked.
*/
void _wait_for_events(unsigned event_id, unsigned event_type)
{
unsigned ctr, event_count = 0, num_cpus = num_secondaries() + 1;;
dsb();
do {
wfe();
for (ctr = 0; ctr < num_cpus; ctr++) {
if (TRUE == _get_event(event_id, ctr)) {
event_count++;
_reset_event(event_id, ctr, event_type);
}
}
} while (event_count != num_cpus);
return;
}
void _set_events(unsigned event_id, unsigned event_type)
{
unsigned ctr;
for (ctr = 0; ctr < (num_secondaries() + 1); ctr++) {
_set_event(event_id, ctr, event_type);
}
return;
}
|
