* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
+ *
+ * (the type definitions are in asm/spinlock_types.h)
*/
#include <linux/config.h>
#include <asm/paca.h>
#include <asm/hvcall.h>
#include <asm/iSeries/HvCall.h>
-typedef struct {
- volatile unsigned int lock;
-#ifdef CONFIG_PREEMPT
- unsigned int break_lock;
-#endif
-} spinlock_t;
+#define __raw_spin_is_locked(x) ((x)->slock != 0)
-typedef struct {
- volatile signed int lock;
-#ifdef CONFIG_PREEMPT
- unsigned int break_lock;
-#endif
-} rwlock_t;
+/*
+ * This returns the old value in the lock, so we succeeded
+ * in getting the lock if the return value is 0.
+ */
+static __inline__ unsigned long __spin_trylock(raw_spinlock_t *lock)
+{
+ unsigned long tmp, tmp2;
-#ifdef __KERNEL__
-#define SPIN_LOCK_UNLOCKED (spinlock_t) { 0 }
+ __asm__ __volatile__(
+" lwz %1,%3(13) # __spin_trylock\n\
+1: lwarx %0,0,%2\n\
+ cmpwi 0,%0,0\n\
+ bne- 2f\n\
+ stwcx. %1,0,%2\n\
+ bne- 1b\n\
+ isync\n\
+2:" : "=&r" (tmp), "=&r" (tmp2)
+ : "r" (&lock->slock), "i" (offsetof(struct paca_struct, lock_token))
+ : "cr0", "memory");
-#define spin_is_locked(x) ((x)->lock != 0)
-#define spin_lock_init(x) do { *(x) = SPIN_LOCK_UNLOCKED; } while(0)
+ return tmp;
+}
-static __inline__ void _raw_spin_unlock(spinlock_t *lock)
+static int __inline__ __raw_spin_trylock(raw_spinlock_t *lock)
{
- __asm__ __volatile__("lwsync # spin_unlock": : :"memory");
- lock->lock = 0;
+ return __spin_trylock(lock) == 0;
}
/*
#if defined(CONFIG_PPC_SPLPAR) || defined(CONFIG_PPC_ISERIES)
/* We only yield to the hypervisor if we are in shared processor mode */
#define SHARED_PROCESSOR (get_paca()->lppaca.shared_proc)
-extern void __spin_yield(spinlock_t *lock);
-extern void __rw_yield(rwlock_t *lock);
+extern void __spin_yield(raw_spinlock_t *lock);
+extern void __rw_yield(raw_rwlock_t *lock);
#else /* SPLPAR || ISERIES */
#define __spin_yield(x) barrier()
#define __rw_yield(x) barrier()
#define SHARED_PROCESSOR 0
#endif
-extern void spin_unlock_wait(spinlock_t *lock);
-
-/*
- * This returns the old value in the lock, so we succeeded
- * in getting the lock if the return value is 0.
- */
-static __inline__ unsigned long __spin_trylock(spinlock_t *lock)
-{
- unsigned long tmp, tmp2;
-
- __asm__ __volatile__(
-" lwz %1,%3(13) # __spin_trylock\n\
-1: lwarx %0,0,%2\n\
- cmpwi 0,%0,0\n\
- bne- 2f\n\
- stwcx. %1,0,%2\n\
- bne- 1b\n\
- isync\n\
-2:" : "=&r" (tmp), "=&r" (tmp2)
- : "r" (&lock->lock), "i" (offsetof(struct paca_struct, lock_token))
- : "cr0", "memory");
-
- return tmp;
-}
-
-static int __inline__ _raw_spin_trylock(spinlock_t *lock)
-{
- return __spin_trylock(lock) == 0;
-}
-static void __inline__ _raw_spin_lock(spinlock_t *lock)
+static void __inline__ __raw_spin_lock(raw_spinlock_t *lock)
{
while (1) {
if (likely(__spin_trylock(lock) == 0))
HMT_low();
if (SHARED_PROCESSOR)
__spin_yield(lock);
- } while (unlikely(lock->lock != 0));
+ } while (unlikely(lock->slock != 0));
HMT_medium();
}
}
-static void __inline__ _raw_spin_lock_flags(spinlock_t *lock, unsigned long flags)
+static void __inline__ __raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long flags)
{
unsigned long flags_dis;
HMT_low();
if (SHARED_PROCESSOR)
__spin_yield(lock);
- } while (unlikely(lock->lock != 0));
+ } while (unlikely(lock->slock != 0));
HMT_medium();
local_irq_restore(flags_dis);
}
}
+static __inline__ void __raw_spin_unlock(raw_spinlock_t *lock)
+{
+ __asm__ __volatile__("lwsync # __raw_spin_unlock": : :"memory");
+ lock->slock = 0;
+}
+
+extern void __raw_spin_unlock_wait(raw_spinlock_t *lock);
+
/*
* Read-write spinlocks, allowing multiple readers
* but only one writer.
* irq-safe write-lock, but readers can get non-irqsafe
* read-locks.
*/
-#define RW_LOCK_UNLOCKED (rwlock_t) { 0 }
-#define rwlock_init(x) do { *(x) = RW_LOCK_UNLOCKED; } while(0)
-
-#define read_can_lock(rw) ((rw)->lock >= 0)
-#define write_can_lock(rw) (!(rw)->lock)
-
-static __inline__ void _raw_write_unlock(rwlock_t *rw)
-{
- __asm__ __volatile__("lwsync # write_unlock": : :"memory");
- rw->lock = 0;
-}
+#define __raw_read_can_lock(rw) ((rw)->lock >= 0)
+#define __raw_write_can_lock(rw) (!(rw)->lock)
/*
* This returns the old value in the lock + 1,
* so we got a read lock if the return value is > 0.
*/
-static long __inline__ __read_trylock(rwlock_t *rw)
+static long __inline__ __read_trylock(raw_rwlock_t *rw)
{
long tmp;
return tmp;
}
-static int __inline__ _raw_read_trylock(rwlock_t *rw)
-{
- return __read_trylock(rw) > 0;
-}
-
-static void __inline__ _raw_read_lock(rwlock_t *rw)
-{
- while (1) {
- if (likely(__read_trylock(rw) > 0))
- break;
- do {
- HMT_low();
- if (SHARED_PROCESSOR)
- __rw_yield(rw);
- } while (unlikely(rw->lock < 0));
- HMT_medium();
- }
-}
-
-static void __inline__ _raw_read_unlock(rwlock_t *rw)
-{
- long tmp;
-
- __asm__ __volatile__(
- "eieio # read_unlock\n\
-1: lwarx %0,0,%1\n\
- addic %0,%0,-1\n\
- stwcx. %0,0,%1\n\
- bne- 1b"
- : "=&r"(tmp)
- : "r"(&rw->lock)
- : "cr0", "memory");
-}
-
/*
* This returns the old value in the lock,
* so we got the write lock if the return value is 0.
*/
-static __inline__ long __write_trylock(rwlock_t *rw)
+static __inline__ long __write_trylock(raw_rwlock_t *rw)
{
long tmp, tmp2;
return tmp;
}
-static int __inline__ _raw_write_trylock(rwlock_t *rw)
+static void __inline__ __raw_read_lock(raw_rwlock_t *rw)
{
- return __write_trylock(rw) == 0;
+ while (1) {
+ if (likely(__read_trylock(rw) > 0))
+ break;
+ do {
+ HMT_low();
+ if (SHARED_PROCESSOR)
+ __rw_yield(rw);
+ } while (unlikely(rw->lock < 0));
+ HMT_medium();
+ }
}
-static void __inline__ _raw_write_lock(rwlock_t *rw)
+static void __inline__ __raw_write_lock(raw_rwlock_t *rw)
{
while (1) {
if (likely(__write_trylock(rw) == 0))
}
}
-#endif /* __KERNEL__ */
+static int __inline__ __raw_read_trylock(raw_rwlock_t *rw)
+{
+ return __read_trylock(rw) > 0;
+}
+
+static int __inline__ __raw_write_trylock(raw_rwlock_t *rw)
+{
+ return __write_trylock(rw) == 0;
+}
+
+static void __inline__ __raw_read_unlock(raw_rwlock_t *rw)
+{
+ long tmp;
+
+ __asm__ __volatile__(
+ "eieio # read_unlock\n\
+1: lwarx %0,0,%1\n\
+ addic %0,%0,-1\n\
+ stwcx. %0,0,%1\n\
+ bne- 1b"
+ : "=&r"(tmp)
+ : "r"(&rw->lock)
+ : "cr0", "memory");
+}
+
+static __inline__ void __raw_write_unlock(raw_rwlock_t *rw)
+{
+ __asm__ __volatile__("lwsync # write_unlock": : :"memory");
+ rw->lock = 0;
+}
+
#endif /* __ASM_SPINLOCK_H */
git.openpandora.org / pandora-kernel.git / blobdiff