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/*
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/*
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 * Copyright (c) 2005 Jakub Jermar
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 * Copyright (c) 2007 Michal Kebrt
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 * All rights reserved.
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 * All rights reserved.
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 *
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * modification, are permitted provided that the following conditions
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 * are met:
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 * are met:
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/** @addtogroup libcarm32  
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/** @addtogroup libcarm32  
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 * @{
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 * @{
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 */
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 */
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/** @file
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/** @file
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 *  @brief Atomic operations.
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 */
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 */
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#ifndef LIBC_arm32_ATOMIC_H_
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#ifndef LIBC_arm32_ATOMIC_H_
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#define LIBC_arm32_ATOMIC_H_
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#define LIBC_arm32_ATOMIC_H_
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/** Atomic addition.
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/** Atomic addition.
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 *
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 *
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 * @param val Atomic value.
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 * @param val Where to add.
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 * @param imm Value to add.
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 * @param i   Value to be added.
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 *
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 *
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 * @return Value after addition.
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 * @return Value after addition.
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 */
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 */
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static inline long atomic_add(atomic_t *val, int imm)
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static inline long atomic_add(atomic_t *val, int i)
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{
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{
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    int ret;
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    volatile long * mem = &(val->count);
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    asm volatile (
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        "1:                 \n"
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        "ldr r2, [%1]       \n"
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        "add r3, r2, %2     \n"
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        "str r3, %0         \n"
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        "swp r3, r3, [%1]   \n"
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        "cmp r3, r2         \n"
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        "bne 1b             \n"
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    /* TODO */
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        : "=m" (ret)
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    return (val->count += imm);
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        : "r" (mem), "r" (i)
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        : "r3", "r2"
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    );
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    return ret;
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}
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}
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/** Atomic increment.
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 *
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 * @param val Variable to be incremented.
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 */
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static inline void atomic_inc(atomic_t *val) { atomic_add(val, 1); }
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static inline void atomic_inc(atomic_t *val) { atomic_add(val, 1); }
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/** Atomic decrement.
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 *
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 * @param val Variable to be decremented.
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 */
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static inline void atomic_dec(atomic_t *val) { atomic_add(val, -1); }
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static inline void atomic_dec(atomic_t *val) { atomic_add(val, -1); }
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static inline long atomic_preinc(atomic_t *val) { return atomic_add(val, 1) + 1; }
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static inline long atomic_predec(atomic_t *val) { return atomic_add(val, -1) - 1; }
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/** Atomic pre-increment.
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 *
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 * @param val Variable to be incremented.
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 * @return    Value after incrementation.
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 */
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static inline long atomic_postinc(atomic_t *val) { return atomic_add(val, 1); }
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static inline long atomic_preinc(atomic_t *val) { return atomic_add(val, 1); }
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/** Atomic pre-decrement.
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 *
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 * @param val Variable to be decremented.
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 * @return    Value after decrementation.
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 */
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static inline long atomic_postdec(atomic_t *val) { return atomic_add(val, -1); }
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static inline long atomic_predec(atomic_t *val) { return atomic_add(val, -1); }
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/** Atomic post-increment.
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 *
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 * @param val Variable to be incremented.
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 * @return    Value before incrementation.
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 */
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static inline long atomic_postinc(atomic_t *val) { return atomic_add(val, 1) - 1; }
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/** Atomic post-decrement.
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 *
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 * @param val Variable to be decremented.
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 * @return    Value before decrementation.
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 */
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static inline long atomic_postdec(atomic_t *val) { return atomic_add(val, -1) + 1; }
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#endif
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#endif
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/** @}
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/** @}
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 */
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 */