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smp: Use stronger barriers around wfe/sev

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Not sure if this fixes anything, but it looks more correct.

Signed-off-by: Hector Martin <marcan@marcan.st>
This commit is contained in:
Hector Martin 2022-06-19 15:20:23 +09:00
parent 512982f4aa
commit ee2949e744
1 changed files with 3 additions and 2 deletions
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5
src/smp.c
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@ -62,6 +62,7 @@ void smp_secondary_entry(void)
else
deep_wfi();
msr(SYS_IMP_APL_IPI_SR_EL1, 1);
sysop("isb");
}
sysop("dmb sy");
me->flag++;
@ -209,7 +210,7 @@ void smp_call4(int cpu, void *func, u64 arg0, u64 arg1, u64 arg2, u64 arg3)
target->args[3] = arg3;
sysop("dmb sy");
target->target = (u64)func;
sysop("dmb sy");
sysop("dsb sy");
if (wfe_mode)
sysop("sev");
@ -236,7 +237,7 @@ u64 smp_wait(int cpu)
void smp_set_wfe_mode(bool new_mode)
{
wfe_mode = new_mode;
sysop("dmb sy");
sysop("dsb sy");
for (int cpu = 1; cpu < MAX_CPUS; cpu++)
if (smp_is_alive(cpu))