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- #ifndef _XTENSA_SPINLOCK_H
- #define _XTENSA_SPINLOCK_H
- #include <asm/barrier.h>
- #include <asm/processor.h>
- #define arch_spin_is_locked(x) ((x)->slock != 0)
- static inline void arch_spin_unlock_wait(arch_spinlock_t *lock)
- {
- smp_cond_load_acquire(&lock->slock, !VAL);
- }
- #define arch_spin_lock_flags(lock, flags) arch_spin_lock(lock)
- static inline void arch_spin_lock(arch_spinlock_t *lock)
- {
- unsigned long tmp;
- __asm__ __volatile__(
- " movi %0, 0\n"
- " wsr %0, scompare1\n"
- "1: movi %0, 1\n"
- " s32c1i %0, %1, 0\n"
- " bnez %0, 1b\n"
- : "=&a" (tmp)
- : "a" (&lock->slock)
- : "memory");
- }
- static inline int arch_spin_trylock(arch_spinlock_t *lock)
- {
- unsigned long tmp;
- __asm__ __volatile__(
- " movi %0, 0\n"
- " wsr %0, scompare1\n"
- " movi %0, 1\n"
- " s32c1i %0, %1, 0\n"
- : "=&a" (tmp)
- : "a" (&lock->slock)
- : "memory");
- return tmp == 0 ? 1 : 0;
- }
- static inline void arch_spin_unlock(arch_spinlock_t *lock)
- {
- unsigned long tmp;
- __asm__ __volatile__(
- " movi %0, 0\n"
- " s32ri %0, %1, 0\n"
- : "=&a" (tmp)
- : "a" (&lock->slock)
- : "memory");
- }
- #define arch_write_can_lock(x) ((x)->lock == 0)
- static inline void arch_write_lock(arch_rwlock_t *rw)
- {
- unsigned long tmp;
- __asm__ __volatile__(
- " movi %0, 0\n"
- " wsr %0, scompare1\n"
- "1: movi %0, 1\n"
- " slli %0, %0, 31\n"
- " s32c1i %0, %1, 0\n"
- " bnez %0, 1b\n"
- : "=&a" (tmp)
- : "a" (&rw->lock)
- : "memory");
- }
- static inline int arch_write_trylock(arch_rwlock_t *rw)
- {
- unsigned long tmp;
- __asm__ __volatile__(
- " movi %0, 0\n"
- " wsr %0, scompare1\n"
- " movi %0, 1\n"
- " slli %0, %0, 31\n"
- " s32c1i %0, %1, 0\n"
- : "=&a" (tmp)
- : "a" (&rw->lock)
- : "memory");
- return tmp == 0 ? 1 : 0;
- }
- static inline void arch_write_unlock(arch_rwlock_t *rw)
- {
- unsigned long tmp;
- __asm__ __volatile__(
- " movi %0, 0\n"
- " s32ri %0, %1, 0\n"
- : "=&a" (tmp)
- : "a" (&rw->lock)
- : "memory");
- }
- static inline void arch_read_lock(arch_rwlock_t *rw)
- {
- unsigned long tmp;
- unsigned long result;
- __asm__ __volatile__(
- "1: l32i %1, %2, 0\n"
- " bltz %1, 1b\n"
- " wsr %1, scompare1\n"
- " addi %0, %1, 1\n"
- " s32c1i %0, %2, 0\n"
- " bne %0, %1, 1b\n"
- : "=&a" (result), "=&a" (tmp)
- : "a" (&rw->lock)
- : "memory");
- }
- static inline int arch_read_trylock(arch_rwlock_t *rw)
- {
- unsigned long result;
- unsigned long tmp;
- __asm__ __volatile__(
- " l32i %1, %2, 0\n"
- " addi %0, %1, 1\n"
- " bltz %0, 1f\n"
- " wsr %1, scompare1\n"
- " s32c1i %0, %2, 0\n"
- " sub %0, %0, %1\n"
- "1:\n"
- : "=&a" (result), "=&a" (tmp)
- : "a" (&rw->lock)
- : "memory");
- return result == 0;
- }
- static inline void arch_read_unlock(arch_rwlock_t *rw)
- {
- unsigned long tmp1, tmp2;
- __asm__ __volatile__(
- "1: l32i %1, %2, 0\n"
- " addi %0, %1, -1\n"
- " wsr %1, scompare1\n"
- " s32c1i %0, %2, 0\n"
- " bne %0, %1, 1b\n"
- : "=&a" (tmp1), "=&a" (tmp2)
- : "a" (&rw->lock)
- : "memory");
- }
- #define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
- #define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
- #endif
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