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Implement deferred IRQ locking. The rest of the support for Xtensa. Untested.

This commit is contained in:
Gregory Nutt 2016-12-23 11:56:17 -06:00
parent cb1cc66d81
commit c7f5435637
1 changed files with 22 additions and 0 deletions
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22
arch/xtensa/src/common/xtensa_context.S
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@ -529,6 +529,28 @@ _xtensa_context_restore:
xtensa_context_restore:
ENTRY(16)
#ifdef CONFIG_SMP
/* Since this function does not return, it is only necessary preserve the
* processor state state are pointer across the following C call.
*/
s32i a2, sp, LOCAL_OFFSET(1)
/* In the SMP configuration, critical section management uses a
* "voting" algorithm with current task on each CPU casting its
* "vote" by the state of the TCB irqcount flag. That irqcount
* for the current task on this CPU will be different is a
* context switch occurrred.
*
* REVISIT: This should be the very last thing that is done before the
* 'rfe'. Ideally, you will like to have all of the registers restored
* (or protected on the stack) when the IRQ lock is unlocked.
*/
call4 irq_restore_lock
l32i a2, sp, LOCAL_OFFSET(1)
#endif
#ifndef __XTENSA_CALL0_ABI__
/* Force a spill of the live registers of the thread that has been
* suspended.