-/* spinlock.h: 64-bit Sparc spinlock support.
- *
- * Copyright (C) 1997 David S. Miller (davem@caip.rutgers.edu)
- */
-
-#ifndef __SPARC64_SPINLOCK_H
-#define __SPARC64_SPINLOCK_H
-
-#include <linux/threads.h> /* For NR_CPUS */
-
-#ifndef __ASSEMBLY__
-
-/* To get debugging spinlocks which detect and catch
- * deadlock situations, set CONFIG_DEBUG_SPINLOCK
- * and rebuild your kernel.
- */
-
-/* All of these locking primitives are expected to work properly
- * even in an RMO memory model, which currently is what the kernel
- * runs in.
- *
- * There is another issue. Because we play games to save cycles
- * in the non-contention case, we need to be extra careful about
- * branch targets into the "spinning" code. They live in their
- * own section, but the newer V9 branches have a shorter range
- * than the traditional 32-bit sparc branch variants. The rule
- * is that the branches that go into and out of the spinner sections
- * must be pre-V9 branches.
- */
-
-#define __raw_spin_is_locked(lp) ((lp)->lock != 0)
-
-#define __raw_spin_unlock_wait(lp) \
- do { rmb(); \
- } while((lp)->lock)
-
-static inline void __raw_spin_lock(raw_spinlock_t *lock)
-{
- unsigned long tmp;
-
- __asm__ __volatile__(
-"1: ldstub [%1], %0\n"
-" membar #StoreLoad | #StoreStore\n"
-" brnz,pn %0, 2f\n"
-" nop\n"
-" .subsection 2\n"
-"2: ldub [%1], %0\n"
-" membar #LoadLoad\n"
-" brnz,pt %0, 2b\n"
-" nop\n"
-" ba,a,pt %%xcc, 1b\n"
-" .previous"
- : "=&r" (tmp)
- : "r" (lock)
- : "memory");
-}
-
-static inline int __raw_spin_trylock(raw_spinlock_t *lock)
-{
- unsigned long result;
-
- __asm__ __volatile__(
-" ldstub [%1], %0\n"
-" membar #StoreLoad | #StoreStore"
- : "=r" (result)
- : "r" (lock)
- : "memory");
-
- return (result == 0UL);
-}
-
-static inline void __raw_spin_unlock(raw_spinlock_t *lock)
-{
- __asm__ __volatile__(
-" membar #StoreStore | #LoadStore\n"
-" stb %%g0, [%0]"
- : /* No outputs */
- : "r" (lock)
- : "memory");
-}
-
-static inline void __raw_spin_lock_flags(raw_spinlock_t *lock, unsigned long flags)
-{
- unsigned long tmp1, tmp2;
-
- __asm__ __volatile__(
-"1: ldstub [%2], %0\n"
-" membar #StoreLoad | #StoreStore\n"
-" brnz,pn %0, 2f\n"
-" nop\n"
-" .subsection 2\n"
-"2: rdpr %%pil, %1\n"
-" wrpr %3, %%pil\n"
-"3: ldub [%2], %0\n"
-" membar #LoadLoad\n"
-" brnz,pt %0, 3b\n"
-" nop\n"
-" ba,pt %%xcc, 1b\n"
-" wrpr %1, %%pil\n"
-" .previous"
- : "=&r" (tmp1), "=&r" (tmp2)
- : "r"(lock), "r"(flags)
- : "memory");
-}
-
-/* Multi-reader locks, these are much saner than the 32-bit Sparc ones... */
-
-static void inline __read_lock(raw_rwlock_t *lock)
-{
- unsigned long tmp1, tmp2;
-
- __asm__ __volatile__ (
-"1: ldsw [%2], %0\n"
-" brlz,pn %0, 2f\n"
-"4: add %0, 1, %1\n"
-" cas [%2], %0, %1\n"
-" cmp %0, %1\n"
-" membar #StoreLoad | #StoreStore\n"
-" bne,pn %%icc, 1b\n"
-" nop\n"
-" .subsection 2\n"
-"2: ldsw [%2], %0\n"
-" membar #LoadLoad\n"
-" brlz,pt %0, 2b\n"
-" nop\n"
-" ba,a,pt %%xcc, 4b\n"
-" .previous"
- : "=&r" (tmp1), "=&r" (tmp2)
- : "r" (lock)
- : "memory");
-}
-
-static int inline __read_trylock(raw_rwlock_t *lock)
-{
- int tmp1, tmp2;
-
- __asm__ __volatile__ (
-"1: ldsw [%2], %0\n"
-" brlz,a,pn %0, 2f\n"
-" mov 0, %0\n"
-" add %0, 1, %1\n"
-" cas [%2], %0, %1\n"
-" cmp %0, %1\n"
-" membar #StoreLoad | #StoreStore\n"
-" bne,pn %%icc, 1b\n"
-" mov 1, %0\n"
-"2:"
- : "=&r" (tmp1), "=&r" (tmp2)
- : "r" (lock)
- : "memory");
-
- return tmp1;
-}
-
-static void inline __read_unlock(raw_rwlock_t *lock)
-{
- unsigned long tmp1, tmp2;
-
- __asm__ __volatile__(
-" membar #StoreLoad | #LoadLoad\n"
-"1: lduw [%2], %0\n"
-" sub %0, 1, %1\n"
-" cas [%2], %0, %1\n"
-" cmp %0, %1\n"
-" bne,pn %%xcc, 1b\n"
-" nop"
- : "=&r" (tmp1), "=&r" (tmp2)
- : "r" (lock)
- : "memory");
-}
-
-static void inline __write_lock(raw_rwlock_t *lock)
-{
- unsigned long mask, tmp1, tmp2;
-
- mask = 0x80000000UL;
-
- __asm__ __volatile__(
-"1: lduw [%2], %0\n"
-" brnz,pn %0, 2f\n"
-"4: or %0, %3, %1\n"
-" cas [%2], %0, %1\n"
-" cmp %0, %1\n"
-" membar #StoreLoad | #StoreStore\n"
-" bne,pn %%icc, 1b\n"
-" nop\n"
-" .subsection 2\n"
-"2: lduw [%2], %0\n"
-" membar #LoadLoad\n"
-" brnz,pt %0, 2b\n"
-" nop\n"
-" ba,a,pt %%xcc, 4b\n"
-" .previous"
- : "=&r" (tmp1), "=&r" (tmp2)
- : "r" (lock), "r" (mask)
- : "memory");
-}
-
-static void inline __write_unlock(raw_rwlock_t *lock)
-{
- __asm__ __volatile__(
-" membar #LoadStore | #StoreStore\n"
-" stw %%g0, [%0]"
- : /* no outputs */
- : "r" (lock)
- : "memory");
-}
-
-static int inline __write_trylock(raw_rwlock_t *lock)
-{
- unsigned long mask, tmp1, tmp2, result;
-
- mask = 0x80000000UL;
-
- __asm__ __volatile__(
-" mov 0, %2\n"
-"1: lduw [%3], %0\n"
-" brnz,pn %0, 2f\n"
-" or %0, %4, %1\n"
-" cas [%3], %0, %1\n"
-" cmp %0, %1\n"
-" membar #StoreLoad | #StoreStore\n"
-" bne,pn %%icc, 1b\n"
-" nop\n"
-" mov 1, %2\n"
-"2:"
- : "=&r" (tmp1), "=&r" (tmp2), "=&r" (result)
- : "r" (lock), "r" (mask)
- : "memory");
-
- return result;
-}
-
-#define __raw_read_lock(p) __read_lock(p)
-#define __raw_read_trylock(p) __read_trylock(p)
-#define __raw_read_unlock(p) __read_unlock(p)
-#define __raw_write_lock(p) __write_lock(p)
-#define __raw_write_unlock(p) __write_unlock(p)
-#define __raw_write_trylock(p) __write_trylock(p)
-
-#define __raw_read_can_lock(rw) (!((rw)->lock & 0x80000000UL))
-#define __raw_write_can_lock(rw) (!(rw)->lock)
-
-#endif /* !(__ASSEMBLY__) */
-
-#endif /* !(__SPARC64_SPINLOCK_H) */
+#include <asm-sparc/spinlock.h>
projects / linux-2.6-omap-h63xx.git / blobdiff