ARM: bcm2836: Send event when onlining other cores

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Secondary cores should enter a low-power idle state when waiting to
be started. The "wfe" instruction causes a core to wait until an event
or interrupt arrives before continuing to the next instruction, and
the "sev" instruction sends a wakeup event to the other cores.

Add an "sev" (and a memory barrier) to bcm2836_boot_secondary, the
function that wakes the waiting cores during booting. This is required
if the secondary cores are sitting in "wfe", and harmless if not.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
Signed-off-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Eric Anholt <eric@anholt.net>

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Phil Elwell 2017-08-08 12:04:55 +01:00 • committed by Florian Fainelli

parent 88bbe85dcd

commit 968f76417d

1 changed files with 3 additions and 0 deletions

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arch/arm/mach-bcm/platsmp.c

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