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Use the wait-for-event instruction to put the core we have just enabled

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to sleep while it waits to start scheduling. The boot core can then use
the send-event instruction to wake the cores when they should enter the
scheduler.

MFC after:	1 week
This commit is contained in:
Andrew Turner 2015-05-23 22:28:59 +00:00
parent 262a84286d
commit f22cb06aeb
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=283331
1 changed files with 9 additions and 2 deletions
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11
sys/arm/arm/mp_machdep.c
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@ -185,8 +185,11 @@ init_secondary(int cpu)
atomic_add_rel_32(&mp_naps, 1);
/* Spin until the BSP releases the APs */
while (!aps_ready)
;
while (!atomic_load_acq_int(&aps_ready)) {
#if __ARM_ARCH >= 7
__asm __volatile("wfe");
#endif
}
/* Initialize curthread */
KASSERT(PCPU_GET(idlethread) != NULL, ("no idle thread"));
@ -353,6 +356,10 @@ release_aps(void *dummy __unused)
arm_unmask_irq(i);
}
atomic_store_rel_int(&aps_ready, 1);
/* Wake the other threads up */
#if __ARM_ARCH >= 7
armv7_sev();
#endif
printf("Release APs\n");