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-rw-r--r--arch/ppc/lib/locks.c189
1 files changed, 0 insertions, 189 deletions
diff --git a/arch/ppc/lib/locks.c b/arch/ppc/lib/locks.c
deleted file mode 100644
index ea4aee6b20e6..000000000000
--- a/arch/ppc/lib/locks.c
+++ /dev/null
@@ -1,189 +0,0 @@
-/*
- * Locks for smp ppc
- *
- * Written by Cort Dougan (cort@cs.nmt.edu)
- */
-
-#include <linux/sched.h>
-#include <linux/spinlock.h>
-#include <linux/module.h>
-#include <asm/ppc_asm.h>
-#include <asm/smp.h>
-
-#ifdef CONFIG_DEBUG_SPINLOCK
-
-#undef INIT_STUCK
-#define INIT_STUCK 200000000 /*0xffffffff*/
-
-/*
- * Try to acquire a spinlock.
- * Only does the stwcx. if the load returned 0 - the Programming
- * Environments Manual suggests not doing unnecessary stcwx.'s
- * since they may inhibit forward progress by other CPUs in getting
- * a lock.
- */
-static inline unsigned long __spin_trylock(volatile unsigned long *lock)
-{
- unsigned long ret;
-
- __asm__ __volatile__ ("\n\
-1: lwarx %0,0,%1\n\
- cmpwi 0,%0,0\n\
- bne 2f\n"
- PPC405_ERR77(0,%1)
-" stwcx. %2,0,%1\n\
- bne- 1b\n\
- isync\n\
-2:"
- : "=&r"(ret)
- : "r"(lock), "r"(1)
- : "cr0", "memory");
-
- return ret;
-}
-
-void _raw_spin_lock(spinlock_t *lock)
-{
- int cpu = smp_processor_id();
- unsigned int stuck = INIT_STUCK;
- while (__spin_trylock(&lock->lock)) {
- while ((unsigned volatile long)lock->lock != 0) {
- if (!--stuck) {
- printk("_spin_lock(%p) CPU#%d NIP %p"
- " holder: cpu %ld pc %08lX\n",
- lock, cpu, __builtin_return_address(0),
- lock->owner_cpu,lock->owner_pc);
- stuck = INIT_STUCK;
- /* steal the lock */
- /*xchg_u32((void *)&lock->lock,0);*/
- }
- }
- }
- lock->owner_pc = (unsigned long)__builtin_return_address(0);
- lock->owner_cpu = cpu;
-}
-EXPORT_SYMBOL(_raw_spin_lock);
-
-int _raw_spin_trylock(spinlock_t *lock)
-{
- if (__spin_trylock(&lock->lock))
- return 0;
- lock->owner_cpu = smp_processor_id();
- lock->owner_pc = (unsigned long)__builtin_return_address(0);
- return 1;
-}
-EXPORT_SYMBOL(_raw_spin_trylock);
-
-void _raw_spin_unlock(spinlock_t *lp)
-{
- if ( !lp->lock )
- printk("_spin_unlock(%p): no lock cpu %d curr PC %p %s/%d\n",
- lp, smp_processor_id(), __builtin_return_address(0),
- current->comm, current->pid);
- if ( lp->owner_cpu != smp_processor_id() )
- printk("_spin_unlock(%p): cpu %d trying clear of cpu %d pc %lx val %lx\n",
- lp, smp_processor_id(), (int)lp->owner_cpu,
- lp->owner_pc,lp->lock);
- lp->owner_pc = lp->owner_cpu = 0;
- wmb();
- lp->lock = 0;
-}
-EXPORT_SYMBOL(_raw_spin_unlock);
-
-/*
- * For rwlocks, zero is unlocked, -1 is write-locked,
- * positive is read-locked.
- */
-static __inline__ int __read_trylock(rwlock_t *rw)
-{
- signed int tmp;
-
- __asm__ __volatile__(
-"2: lwarx %0,0,%1 # __read_trylock\n\
- addic. %0,%0,1\n\
- ble- 1f\n"
- PPC405_ERR77(0,%1)
-" stwcx. %0,0,%1\n\
- bne- 2b\n\
- isync\n\
-1:"
- : "=&r"(tmp)
- : "r"(&rw->lock)
- : "cr0", "memory");
-
- return tmp;
-}
-
-int _raw_read_trylock(rwlock_t *rw)
-{
- return __read_trylock(rw) > 0;
-}
-EXPORT_SYMBOL(_raw_read_trylock);
-
-void _raw_read_lock(rwlock_t *rw)
-{
- unsigned int stuck;
-
- while (__read_trylock(rw) <= 0) {
- stuck = INIT_STUCK;
- while (!read_can_lock(rw)) {
- if (--stuck == 0) {
- printk("_read_lock(%p) CPU#%d lock %d\n",
- rw, raw_smp_processor_id(), rw->lock);
- stuck = INIT_STUCK;
- }
- }
- }
-}
-EXPORT_SYMBOL(_raw_read_lock);
-
-void _raw_read_unlock(rwlock_t *rw)
-{
- if ( rw->lock == 0 )
- printk("_read_unlock(): %s/%d (nip %08lX) lock %d\n",
- current->comm,current->pid,current->thread.regs->nip,
- rw->lock);
- wmb();
- atomic_dec((atomic_t *) &(rw)->lock);
-}
-EXPORT_SYMBOL(_raw_read_unlock);
-
-void _raw_write_lock(rwlock_t *rw)
-{
- unsigned int stuck;
-
- while (cmpxchg(&rw->lock, 0, -1) != 0) {
- stuck = INIT_STUCK;
- while (!write_can_lock(rw)) {
- if (--stuck == 0) {
- printk("write_lock(%p) CPU#%d lock %d)\n",
- rw, raw_smp_processor_id(), rw->lock);
- stuck = INIT_STUCK;
- }
- }
- }
- wmb();
-}
-EXPORT_SYMBOL(_raw_write_lock);
-
-int _raw_write_trylock(rwlock_t *rw)
-{
- if (cmpxchg(&rw->lock, 0, -1) != 0)
- return 0;
- wmb();
- return 1;
-}
-EXPORT_SYMBOL(_raw_write_trylock);
-
-void _raw_write_unlock(rwlock_t *rw)
-{
- if (rw->lock >= 0)
- printk("_write_lock(): %s/%d (nip %08lX) lock %d\n",
- current->comm,current->pid,current->thread.regs->nip,
- rw->lock);
- wmb();
- rw->lock = 0;
-}
-EXPORT_SYMBOL(_raw_write_unlock);
-
-#endif
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