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SMP: Add support for linking spinlocks into a special, non-cached memory region.

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This commit is contained in:
Gregory Nutt
2016-11-26 08:47:03 -06:00
parent 1d06e786e1
commit e3fe320e08
11 changed files with 109 additions and 40 deletions
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include/nuttx/spinlock.h
+18 -5
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@@ -69,16 +69,29 @@
* DSB - Data syncrhonization barrier.
*/
#define HAVE_DMB 1
#ifndef SP_DMB
#undef __SP_UNLOCK_FUNCTION
#if !defined(SP_DMB)
# define SP_DMB()
# undef HAVE_DMB
#else
# define __SP_UNLOCK_FUNCTION 1
#endif
#ifndef SP_DSB
#if !defined(SP_DSB)
# define SP_DSB()
#endif
/* If the target CPU supports a data cache then it may be necessary to
* manage spinlocks in a special way, perhaps linking them all into a
* special non-cacheable memory region.
*
* SP_SECTION - Special storage attributes may be required to force
* spinlocks into a special, non-cacheable section.
*/
#if !defined(SP_SECTION)
# define SP_SECTION
#endif
/****************************************************************************
* Public Types
****************************************************************************/
@@ -244,7 +257,7 @@ void spin_lockr(FAR struct spinlock_s *lock);
*
****************************************************************************/
#ifdef HAVE_DMB
#ifdef __SP_UNLOCK_FUNCTION
void spin_unlock(FAR volatile spinlock_t *lock);
#else
# define spin_unlock(l) do { *(l) = SP_UNLOCKED; } while (0)