summaryrefslogtreecommitdiff
path: root/big-little/secure_world/events.c
blob: 6577a05c9814ddac2c66e77037cff12d19598a9d (plain)
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;
}