#ifndef __SPARC64_SPINLOCK_H
#define __SPARC64_SPINLOCK_H
-#include <linux/config.h>
#include <linux/threads.h> /* For NR_CPUS */
#ifndef __ASSEMBLY__
* must be pre-V9 branches.
*/
-#ifndef CONFIG_DEBUG_SPINLOCK
+#define __raw_spin_is_locked(lp) ((lp)->lock != 0)
-typedef unsigned char spinlock_t;
-#define SPIN_LOCK_UNLOCKED 0
+#define __raw_spin_unlock_wait(lp) \
+ do { rmb(); \
+ } while((lp)->lock)
-#define spin_lock_init(lock) (*((unsigned char *)(lock)) = 0)
-#define spin_is_locked(lock) (*((volatile unsigned char *)(lock)) != 0)
+static inline void __raw_spin_lock(raw_spinlock_t *lock)
+{
+ unsigned long tmp;
-#define spin_unlock_wait(lock) \
-do { membar("#LoadLoad"); \
-} while(*((volatile unsigned char *)lock))
+ __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__ void _raw_spin_lock(spinlock_t *lock)
+static inline int __raw_spin_trylock(raw_spinlock_t *lock)
{
+ unsigned long result;
+
__asm__ __volatile__(
-"1: ldstub [%0], %%g7\n"
-" brnz,pn %%g7, 2f\n"
-" membar #StoreLoad | #StoreStore\n"
+" 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: ldub [%0], %%g7\n"
-" brnz,pt %%g7, 2b\n"
-" membar #LoadLoad\n"
-" b,a,pt %%xcc, 1b\n"
-" .previous\n"
- : /* no outputs */
+"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)
- : "g7", "memory");
+ : "memory");
}
-static __inline__ int _raw_spin_trylock(spinlock_t *lock)
+static int inline __read_trylock(raw_rwlock_t *lock)
{
- unsigned int result;
- __asm__ __volatile__("ldstub [%1], %0\n\t"
- "membar #StoreLoad | #StoreStore"
- : "=r" (result)
- : "r" (lock)
- : "memory");
- return (result == 0);
+ 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 __inline__ void _raw_spin_unlock(spinlock_t *lock)
+static void inline __read_unlock(raw_rwlock_t *lock)
{
- __asm__ __volatile__("membar #StoreStore | #LoadStore\n\t"
- "stb %%g0, [%0]"
- : /* No outputs */
- : "r" (lock)
- : "memory");
+ 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");
}
-#else /* !(CONFIG_DEBUG_SPINLOCK) */
-
-typedef struct {
- unsigned char lock;
- unsigned int owner_pc, owner_cpu;
-} spinlock_t;
-#define SPIN_LOCK_UNLOCKED (spinlock_t) { 0, 0, 0xff }
-#define spin_lock_init(__lock) \
-do { (__lock)->lock = 0; \
- (__lock)->owner_pc = 0; \
- (__lock)->owner_cpu = 0xff; \
-} while(0)
-#define spin_is_locked(__lock) (*((volatile unsigned char *)(&((__lock)->lock))) != 0)
-#define spin_unlock_wait(__lock) \
-do { \
- membar("#LoadLoad"); \
-} while(*((volatile unsigned char *)(&((__lock)->lock))))
-
-extern void _do_spin_lock (spinlock_t *lock, char *str);
-extern void _do_spin_unlock (spinlock_t *lock);
-extern int _spin_trylock (spinlock_t *lock);
-
-#define _raw_spin_trylock(lp) _spin_trylock(lp)
-#define _raw_spin_lock(lock) _do_spin_lock(lock, "spin_lock")
-#define _raw_spin_unlock(lock) _do_spin_unlock(lock)
-
-#endif /* CONFIG_DEBUG_SPINLOCK */
+static void inline __write_lock(raw_rwlock_t *lock)
+{
+ unsigned long mask, tmp1, tmp2;
-/* Multi-reader locks, these are much saner than the 32-bit Sparc ones... */
+ 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)
-#ifndef CONFIG_DEBUG_SPINLOCK
-
-typedef unsigned int rwlock_t;
-#define RW_LOCK_UNLOCKED 0
-#define rwlock_init(lp) do { *(lp) = RW_LOCK_UNLOCKED; } while(0)
-#define rwlock_is_locked(x) (*(x) != RW_LOCK_UNLOCKED)
-
-extern void __read_lock(rwlock_t *);
-extern void __read_unlock(rwlock_t *);
-extern void __write_lock(rwlock_t *);
-extern void __write_unlock(rwlock_t *);
-extern int __write_trylock(rwlock_t *);
-
-#define _raw_read_lock(p) __read_lock(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)
-
-#else /* !(CONFIG_DEBUG_SPINLOCK) */
-
-typedef struct {
- unsigned long lock;
- unsigned int writer_pc, writer_cpu;
- unsigned int reader_pc[NR_CPUS];
-} rwlock_t;
-#define RW_LOCK_UNLOCKED (rwlock_t) { 0, 0, 0xff, { } }
-#define rwlock_init(lp) do { *(lp) = RW_LOCK_UNLOCKED; } while(0)
-#define rwlock_is_locked(x) ((x)->lock != 0)
-
-extern void _do_read_lock(rwlock_t *rw, char *str);
-extern void _do_read_unlock(rwlock_t *rw, char *str);
-extern void _do_write_lock(rwlock_t *rw, char *str);
-extern void _do_write_unlock(rwlock_t *rw);
-
-#define _raw_read_lock(lock) \
-do { unsigned long flags; \
- local_irq_save(flags); \
- _do_read_lock(lock, "read_lock"); \
- local_irq_restore(flags); \
-} while(0)
-
-#define _raw_read_unlock(lock) \
-do { unsigned long flags; \
- local_irq_save(flags); \
- _do_read_unlock(lock, "read_unlock"); \
- local_irq_restore(flags); \
-} while(0)
-
-#define _raw_write_lock(lock) \
-do { unsigned long flags; \
- local_irq_save(flags); \
- _do_write_lock(lock, "write_lock"); \
- local_irq_restore(flags); \
-} while(0)
-
-#define _raw_write_unlock(lock) \
-do { unsigned long flags; \
- local_irq_save(flags); \
- _do_write_unlock(lock); \
- local_irq_restore(flags); \
-} while(0)
-
-#endif /* CONFIG_DEBUG_SPINLOCK */
+#define _raw_spin_relax(lock) cpu_relax()
+#define _raw_read_relax(lock) cpu_relax()
+#define _raw_write_relax(lock) cpu_relax()
#endif /* !(__ASSEMBLY__) */