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author | andrew <andrew@FreeBSD.org> | 2015-05-23 22:28:59 +0000 |
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committer | andrew <andrew@FreeBSD.org> | 2015-05-23 22:28:59 +0000 |
commit | 0926af4e2a44b22e2538a698379dc29593568f82 (patch) | |
tree | 97b9b91fe551daef37eb4c2a8c23c01889c548f7 | |
parent | b51d622ba8bdda20dd5d25f755d4fcf303478339 (diff) | |
download | FreeBSD-src-0926af4e2a44b22e2538a698379dc29593568f82.zip FreeBSD-src-0926af4e2a44b22e2538a698379dc29593568f82.tar.gz |
Use the wait-for-event instruction to put the core we have just enabled
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
-rw-r--r-- | sys/arm/arm/mp_machdep.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/sys/arm/arm/mp_machdep.c b/sys/arm/arm/mp_machdep.c index c0f723c..88104f0 100644 --- a/sys/arm/arm/mp_machdep.c +++ b/sys/arm/arm/mp_machdep.c @@ -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"); |