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/* * Copyright (C) 2014 Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> * * This file is licensed under the terms of the GNU General Public License * version 2. This program is licensed "as is" without any warranty of any * kind, whether express or implied. */ #ifndef __ASM_OPENRISC_ATOMIC_H #define __ASM_OPENRISC_ATOMIC_H #include <linux/types.h> /* Atomically perform op with v->counter and i */ #define ATOMIC_OP(op) \ static inline void atomic_##op(int i, atomic_t *v) \ { \ int tmp; \ \ __asm__ __volatile__( \ "1: l.lwa %0,0(%1) \n" \ " l." #op " %0,%0,%2 \n" \ " l.swa 0(%1),%0 \n" \ " l.bnf 1b \n" \ " l.nop \n" \ : "=&r"(tmp) \ : "r"(&v->counter), "r"(i) \ : "cc", "memory"); \ } /* Atomically perform op with v->counter and i, return the result */ #define ATOMIC_OP_RETURN(op) \ static inline int atomic_##op##_return(int i, atomic_t *v) \ { \ int tmp; \ \ __asm__ __volatile__( \ "1: l.lwa %0,0(%1) \n" \ " l." #op " %0,%0,%2 \n" \ " l.swa 0(%1),%0 \n" \ " l.bnf 1b \n" \ " l.nop \n" \ : "=&r"(tmp) \ : "r"(&v->counter), "r"(i) \ : "cc", "memory"); \ \ return tmp; \ } /* Atomically perform op with v->counter and i, return orig v->counter */ #define ATOMIC_FETCH_OP(op) \ static inline int atomic_fetch_##op(int i, atomic_t *v) \ { \ int tmp, old; \ \ __asm__ __volatile__( \ "1: l.lwa %0,0(%2) \n" \ " l." #op " %1,%0,%3 \n" \ " l.swa 0(%2),%1 \n" \ " l.bnf 1b \n" \ " l.nop \n" \ : "=&r"(old), "=&r"(tmp) \ : "r"(&v->counter), "r"(i) \ : "cc", "memory"); \ \ return old; \ } ATOMIC_OP_RETURN(add) ATOMIC_OP_RETURN(sub) ATOMIC_FETCH_OP(add) ATOMIC_FETCH_OP(sub) ATOMIC_FETCH_OP(and) ATOMIC_FETCH_OP(or) ATOMIC_FETCH_OP(xor) ATOMIC_OP(and) ATOMIC_OP(or) ATOMIC_OP(xor) #undef ATOMIC_FETCH_OP #undef ATOMIC_OP_RETURN #undef ATOMIC_OP #define atomic_add_return atomic_add_return #define atomic_sub_return atomic_sub_return #define atomic_fetch_add atomic_fetch_add #define atomic_fetch_sub atomic_fetch_sub #define atomic_fetch_and atomic_fetch_and #define atomic_fetch_or atomic_fetch_or #define atomic_fetch_xor atomic_fetch_xor #define atomic_and atomic_and #define atomic_or atomic_or #define atomic_xor atomic_xor /* * Atomically add a to v->counter as long as v is not already u. * Returns the original value at v->counter. * * This is often used through atomic_inc_not_zero() */ static inline int atomic_fetch_add_unless(atomic_t *v, int a, int u) { int old, tmp; __asm__ __volatile__( "1: l.lwa %0, 0(%2) \n" " l.sfeq %0, %4 \n" " l.bf 2f \n" " l.add %1, %0, %3 \n" " l.swa 0(%2), %1 \n" " l.bnf 1b \n" " l.nop \n" "2: \n" : "=&r"(old), "=&r" (tmp) : "r"(&v->counter), "r"(a), "r"(u) : "cc", "memory"); return old; } #define atomic_fetch_add_unless atomic_fetch_add_unless #include <asm-generic/atomic.h> #endif /* __ASM_OPENRISC_ATOMIC_H */
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