#ifndef _ASM_M32R_ATOMIC_H #define _ASM_M32R_ATOMIC_H /* * linux/include/asm-m32r/atomic.h * * M32R version: * Copyright (C) 2001, 2002 Hitoshi Yamamoto * Copyright (C) 2004 Hirokazu Takata */ #include #include #include #include #include /* * Atomic operations that C can't guarantee us. Useful for * resource counting etc.. */ #define ATOMIC_INIT(i) { (i) } /** * atomic_read - read atomic variable * @v: pointer of type atomic_t * * Atomically reads the value of @v. */ #define atomic_read(v) READ_ONCE((v)->counter) /** * atomic_set - set atomic variable * @v: pointer of type atomic_t * @i: required value * * Atomically sets the value of @v to @i. */ #define atomic_set(v,i) WRITE_ONCE(((v)->counter), (i)) #ifdef CONFIG_CHIP_M32700_TS1 #define __ATOMIC_CLOBBER , "r4" #else #define __ATOMIC_CLOBBER #endif #define ATOMIC_OP(op) \ static __inline__ void atomic_##op(int i, atomic_t *v) \ { \ unsigned long flags; \ int result; \ \ local_irq_save(flags); \ __asm__ __volatile__ ( \ "# atomic_" #op " \n\t" \ DCACHE_CLEAR("%0", "r4", "%1") \ M32R_LOCK" %0, @%1; \n\t" \ #op " %0, %2; \n\t" \ M32R_UNLOCK" %0, @%1; \n\t" \ : "=&r" (result) \ : "r" (&v->counter), "r" (i) \ : "memory" \ __ATOMIC_CLOBBER \ ); \ local_irq_restore(flags); \ } \ #define ATOMIC_OP_RETURN(op) \ static __inline__ int atomic_##op##_return(int i, atomic_t *v) \ { \ unsigned long flags; \ int result; \ \ local_irq_save(flags); \ __asm__ __volatile__ ( \ "# atomic_" #op "_return \n\t" \ DCACHE_CLEAR("%0", "r4", "%1") \ M32R_LOCK" %0, @%1; \n\t" \ #op " %0, %2; \n\t" \ M32R_UNLOCK" %0, @%1; \n\t" \ : "=&r" (result) \ : "r" (&v->counter), "r" (i) \ : "memory" \ __ATOMIC_CLOBBER \ ); \ local_irq_restore(flags); \ \ return result; \ } #define ATOMIC_FETCH_OP(op) \ static __inline__ int atomic_fetch_##op(int i, atomic_t *v) \ { \ unsigned long flags; \ int result, val; \ \ local_irq_save(flags); \ __asm__ __volatile__ ( \ "# atomic_fetch_" #op " \n\t" \ DCACHE_CLEAR("%0", "r4", "%2") \ M32R_LOCK" %1, @%2; \n\t" \ "mv %0, %1 \n\t" \ #op " %1, %3; \n\t" \ M32R_UNLOCK" %1, @%2; \n\t" \ : "=&r" (result), "=&r" (val) \ : "r" (&v->counter), "r" (i) \ : "memory" \ __ATOMIC_CLOBBER \ ); \ local_irq_restore(flags); \ \ return result; \ } #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_OP_RETURN(op) ATOMIC_FETCH_OP(op) ATOMIC_OPS(add) ATOMIC_OPS(sub) #undef ATOMIC_OPS #define ATOMIC_OPS(op) ATOMIC_OP(op) ATOMIC_FETCH_OP(op) ATOMIC_OPS(and) ATOMIC_OPS(or) ATOMIC_OPS(xor) #undef ATOMIC_OPS #undef ATOMIC_FETCH_OP #undef ATOMIC_OP_RETURN #undef ATOMIC_OP /** * atomic_sub_and_test - subtract value from variable and test result * @i: integer value to subtract * @v: pointer of type atomic_t * * Atomically subtracts @i from @v and returns * true if the result is zero, or false for all * other cases. */ #define atomic_sub_and_test(i,v) (atomic_sub_return((i), (v)) == 0) /** * atomic_inc_return - increment atomic variable and return it * @v: pointer of type atomic_t * * Atomically increments @v by 1 and returns the result. */ static __inline__ int atomic_inc_return(atomic_t *v) { unsigned long flags; int result; local_irq_save(flags); __asm__ __volatile__ ( "# atomic_inc_return \n\t" DCACHE_CLEAR("%0", "r4", "%1") M32R_LOCK" %0, @%1; \n\t" "addi %0, #1; \n\t" M32R_UNLOCK" %0, @%1; \n\t" : "=&r" (result) : "r" (&v->counter) : "memory" __ATOMIC_CLOBBER ); local_irq_restore(flags); return result; } /** * atomic_dec_return - decrement atomic variable and return it * @v: pointer of type atomic_t * * Atomically decrements @v by 1 and returns the result. */ static __inline__ int atomic_dec_return(atomic_t *v) { unsigned long flags; int result; local_irq_save(flags); __asm__ __volatile__ ( "# atomic_dec_return \n\t" DCACHE_CLEAR("%0", "r4", "%1") M32R_LOCK" %0, @%1; \n\t" "addi %0, #-1; \n\t" M32R_UNLOCK" %0, @%1; \n\t" : "=&r" (result) : "r" (&v->counter) : "memory" __ATOMIC_CLOBBER ); local_irq_restore(flags); return result; } /** * atomic_inc - increment atomic variable * @v: pointer of type atomic_t * * Atomically increments @v by 1. */ #define atomic_inc(v) ((void)atomic_inc_return(v)) /** * atomic_dec - decrement atomic variable * @v: pointer of type atomic_t * * Atomically decrements @v by 1. */ #define atomic_dec(v) ((void)atomic_dec_return(v)) /** * atomic_inc_and_test - increment and test * @v: pointer of type atomic_t * * Atomically increments @v by 1 * and returns true if the result is zero, or false for all * other cases. */ #define atomic_inc_and_test(v) (atomic_inc_return(v) == 0) /** * atomic_dec_and_test - decrement and test * @v: pointer of type atomic_t * * Atomically decrements @v by 1 and * returns true if the result is 0, or false for all * other cases. */ #define atomic_dec_and_test(v) (atomic_dec_return(v) == 0) /** * atomic_add_negative - add and test if negative * @v: pointer of type atomic_t * @i: integer value to add * * Atomically adds @i to @v and returns true * if the result is negative, or false when * result is greater than or equal to zero. */ #define atomic_add_negative(i,v) (atomic_add_return((i), (v)) < 0) #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n))) #define atomic_xchg(v, new) (xchg(&((v)->counter), new)) /** * __atomic_add_unless - add unless the number is a given value * @v: pointer of type atomic_t * @a: the amount to add to v... * @u: ...unless v is equal to u. * * Atomically adds @a to @v, so long as it was not @u. * Returns the old value of @v. */ static __inline__ int __atomic_add_unless(atomic_t *v, int a, int u) { int c, old; c = atomic_read(v); for (;;) { if (unlikely(c == (u))) break; old = atomic_cmpxchg((v), c, c + (a)); if (likely(old == c)) break; c = old; } return c; } #endif /* _ASM_M32R_ATOMIC_H */