blob: 8bf220edfedfe97e0e3cd35f153f27a417bc84de (
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
|
#include "demo.h"
#define SMP_CTRL_BASE 0x30140000
#define SMP_CTRL (*(volatile unsigned *)SMP_CTRL_BASE)
int cpu_is_alive(unsigned num)
{
return !!(SMP_CTRL & (0b100 << (num * 8)));
}
void run_cpu(unsigned num)
{
run_cpus(1 << num);
}
void run_cpus(unsigned mask)
{
unsigned ctrl_word = 0, ctrl_read = SMP_CTRL;
for (unsigned cpu = 0; cpu < NUM_CPUS; ++cpu) {
if (!(mask & (1 << cpu)))
continue;
if (ctrl_read & (0b001 << (cpu * 8))) {
print("run cpu%u", cpu);
ctrl_word |= 0b001 << (cpu * 8);
} else
print("cpu%u already running", cpu);
}
SMP_CTRL = ctrl_word;
}
void halt_cpu(unsigned num)
{
halt_cpus(1 << num);
}
void halt_cpus(unsigned mask)
{
unsigned ctrl_word = 0, ctrl_read = SMP_CTRL;
for (unsigned cpu = 0; cpu < NUM_CPUS; ++cpu) {
if (!(mask & (1 << cpu)))
continue;
if (!(ctrl_read & (0b001 << (cpu * 8)))) {
print("halt cpu%u%s", cpu, cpu == this_cpu->num ? " (myself)" : "");
ctrl_word |= 0b010 << (cpu * 8);
} else
print("cpu%u already halted", cpu);
}
SMP_CTRL = ctrl_word;
}
|
