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authorSrikant Patnaik2015-01-11 12:28:04 +0530
committerSrikant Patnaik2015-01-11 12:28:04 +0530
commit871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch)
tree8718f573808810c2a1e8cb8fb6ac469093ca2784 /ANDROID_3.4.5/arch/parisc/include/asm/spinlock.h
parent9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff)
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Moved, renamed, and deleted files
The original directory structure was scattered and unorganized. Changes are basically to make it look like kernel structure.
Diffstat (limited to 'ANDROID_3.4.5/arch/parisc/include/asm/spinlock.h')
-rw-r--r--ANDROID_3.4.5/arch/parisc/include/asm/spinlock.h198
1 files changed, 0 insertions, 198 deletions
diff --git a/ANDROID_3.4.5/arch/parisc/include/asm/spinlock.h b/ANDROID_3.4.5/arch/parisc/include/asm/spinlock.h
deleted file mode 100644
index 3516e0b2..00000000
--- a/ANDROID_3.4.5/arch/parisc/include/asm/spinlock.h
+++ /dev/null
@@ -1,198 +0,0 @@
-#ifndef __ASM_SPINLOCK_H
-#define __ASM_SPINLOCK_H
-
-#include <asm/barrier.h>
-#include <asm/ldcw.h>
-#include <asm/processor.h>
-#include <asm/spinlock_types.h>
-
-static inline int arch_spin_is_locked(arch_spinlock_t *x)
-{
- volatile unsigned int *a = __ldcw_align(x);
- return *a == 0;
-}
-
-#define arch_spin_lock(lock) arch_spin_lock_flags(lock, 0)
-#define arch_spin_unlock_wait(x) \
- do { cpu_relax(); } while (arch_spin_is_locked(x))
-
-static inline void arch_spin_lock_flags(arch_spinlock_t *x,
- unsigned long flags)
-{
- volatile unsigned int *a;
-
- mb();
- a = __ldcw_align(x);
- while (__ldcw(a) == 0)
- while (*a == 0)
- if (flags & PSW_SM_I) {
- local_irq_enable();
- cpu_relax();
- local_irq_disable();
- } else
- cpu_relax();
- mb();
-}
-
-static inline void arch_spin_unlock(arch_spinlock_t *x)
-{
- volatile unsigned int *a;
- mb();
- a = __ldcw_align(x);
- *a = 1;
- mb();
-}
-
-static inline int arch_spin_trylock(arch_spinlock_t *x)
-{
- volatile unsigned int *a;
- int ret;
-
- mb();
- a = __ldcw_align(x);
- ret = __ldcw(a) != 0;
- mb();
-
- return ret;
-}
-
-/*
- * Read-write spinlocks, allowing multiple readers but only one writer.
- * Linux rwlocks are unfair to writers; they can be starved for an indefinite
- * time by readers. With care, they can also be taken in interrupt context.
- *
- * In the PA-RISC implementation, we have a spinlock and a counter.
- * Readers use the lock to serialise their access to the counter (which
- * records how many readers currently hold the lock).
- * Writers hold the spinlock, preventing any readers or other writers from
- * grabbing the rwlock.
- */
-
-/* Note that we have to ensure interrupts are disabled in case we're
- * interrupted by some other code that wants to grab the same read lock */
-static __inline__ void arch_read_lock(arch_rwlock_t *rw)
-{
- unsigned long flags;
- local_irq_save(flags);
- arch_spin_lock_flags(&rw->lock, flags);
- rw->counter++;
- arch_spin_unlock(&rw->lock);
- local_irq_restore(flags);
-}
-
-/* Note that we have to ensure interrupts are disabled in case we're
- * interrupted by some other code that wants to grab the same read lock */
-static __inline__ void arch_read_unlock(arch_rwlock_t *rw)
-{
- unsigned long flags;
- local_irq_save(flags);
- arch_spin_lock_flags(&rw->lock, flags);
- rw->counter--;
- arch_spin_unlock(&rw->lock);
- local_irq_restore(flags);
-}
-
-/* Note that we have to ensure interrupts are disabled in case we're
- * interrupted by some other code that wants to grab the same read lock */
-static __inline__ int arch_read_trylock(arch_rwlock_t *rw)
-{
- unsigned long flags;
- retry:
- local_irq_save(flags);
- if (arch_spin_trylock(&rw->lock)) {
- rw->counter++;
- arch_spin_unlock(&rw->lock);
- local_irq_restore(flags);
- return 1;
- }
-
- local_irq_restore(flags);
- /* If write-locked, we fail to acquire the lock */
- if (rw->counter < 0)
- return 0;
-
- /* Wait until we have a realistic chance at the lock */
- while (arch_spin_is_locked(&rw->lock) && rw->counter >= 0)
- cpu_relax();
-
- goto retry;
-}
-
-/* Note that we have to ensure interrupts are disabled in case we're
- * interrupted by some other code that wants to read_trylock() this lock */
-static __inline__ void arch_write_lock(arch_rwlock_t *rw)
-{
- unsigned long flags;
-retry:
- local_irq_save(flags);
- arch_spin_lock_flags(&rw->lock, flags);
-
- if (rw->counter != 0) {
- arch_spin_unlock(&rw->lock);
- local_irq_restore(flags);
-
- while (rw->counter != 0)
- cpu_relax();
-
- goto retry;
- }
-
- rw->counter = -1; /* mark as write-locked */
- mb();
- local_irq_restore(flags);
-}
-
-static __inline__ void arch_write_unlock(arch_rwlock_t *rw)
-{
- rw->counter = 0;
- arch_spin_unlock(&rw->lock);
-}
-
-/* Note that we have to ensure interrupts are disabled in case we're
- * interrupted by some other code that wants to read_trylock() this lock */
-static __inline__ int arch_write_trylock(arch_rwlock_t *rw)
-{
- unsigned long flags;
- int result = 0;
-
- local_irq_save(flags);
- if (arch_spin_trylock(&rw->lock)) {
- if (rw->counter == 0) {
- rw->counter = -1;
- result = 1;
- } else {
- /* Read-locked. Oh well. */
- arch_spin_unlock(&rw->lock);
- }
- }
- local_irq_restore(flags);
-
- return result;
-}
-
-/*
- * read_can_lock - would read_trylock() succeed?
- * @lock: the rwlock in question.
- */
-static __inline__ int arch_read_can_lock(arch_rwlock_t *rw)
-{
- return rw->counter >= 0;
-}
-
-/*
- * write_can_lock - would write_trylock() succeed?
- * @lock: the rwlock in question.
- */
-static __inline__ int arch_write_can_lock(arch_rwlock_t *rw)
-{
- return !rw->counter;
-}
-
-#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
-#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
-
-#define arch_spin_relax(lock) cpu_relax()
-#define arch_read_relax(lock) cpu_relax()
-#define arch_write_relax(lock) cpu_relax()
-
-#endif /* __ASM_SPINLOCK_H */