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 */
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 */
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#ifndef KERN_mips32_ATOMIC_H_
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#ifndef KERN_mips32_ATOMIC_H_
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#define KERN_mips32_ATOMIC_H_
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#define KERN_mips32_ATOMIC_H_
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#define atomic_inc(x)   ((void) atomic_add(x, 1))
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#define atomic_inc(x)  ((void) atomic_add(x, 1))
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#define atomic_dec(x)   ((void) atomic_add(x, -1))
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#define atomic_dec(x)  ((void) atomic_add(x, -1))
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#define atomic_postinc(x) (atomic_add(x, 1) - 1)
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#define atomic_postinc(x)  (atomic_add(x, 1) - 1)
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#define atomic_postdec(x) (atomic_add(x, -1) + 1)
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#define atomic_postdec(x)  (atomic_add(x, -1) + 1)
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#define atomic_preinc(x) atomic_add(x, 1)
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#define atomic_preinc(x)  atomic_add(x, 1)
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#define atomic_predec(x) atomic_add(x, -1)
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#define atomic_predec(x)  atomic_add(x, -1)
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/* Atomic addition of immediate value.
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/* Atomic addition of immediate value.
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 *
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 *
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 * @param val Memory location to which will be the immediate value added.
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 * @param val Memory location to which will be the immediate value added.
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 * @param i Signed immediate that will be added to *val.
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 * @param i Signed immediate that will be added to *val.
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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 i)
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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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    long tmp, v;
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    long tmp, v;
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    asm volatile (
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    asm volatile (
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        "1:\n"
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        "1:\n"
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        "   ll %0, %1\n"
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        "   ll %0, %1\n"
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        "   addu %0, %0, %3\n"  /* same as addi, but never traps on overflow */
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        "   addu %0, %0, %3\n"  /* same as addi, but never traps on overflow */
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        "       move %2, %0\n"
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        "   move %2, %0\n"
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        "   sc %0, %1\n"
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        "   sc %0, %1\n"
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        "   beq %0, %4, 1b\n"   /* if the atomic operation failed, try again */
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        "   beq %0, %4, 1b\n"   /* if the atomic operation failed, try again */
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        "   nop\n"
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        "   nop\n"
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        : "=&r" (tmp), "+m" (val->count), "=&r" (v)
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        : "=&r" (tmp), "+m" (val->count), "=&r" (v)
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        : "r" (i), "i" (0)
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        : "r" (i), "i" (0)
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        );
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    );
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    return v;
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}
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static inline uint32_t test_and_set(atomic_t *val) {
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    uint32_t tmp, v;
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    asm volatile (
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        "1:\n"
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        "   ll %2, %1\n"
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        "   bnez %2, 2f\n"
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        "   li %0, %3\n"
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        "   sc %0, %1\n"
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        "   beqz %0, 1b\n"
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        "2:\n"
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        : "=&r" (tmp), "+m" (val->count), "=&r" (v)
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        : "i" (1)
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    );
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    return v;
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    return v;
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}
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}
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#endif
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#endif
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