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 *
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 *
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 * @param i Region register index.
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 * @param i Region register index.
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 *
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 *
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 * @return Current contents of rr[i].
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 * @return Current contents of rr[i].
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 */
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 */
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static inline uint64_t rr_read(index_t i)
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static inline uint64_t rr_read(size_t i)
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{
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{
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    uint64_t ret;
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    uint64_t ret;
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    ASSERT(i < REGION_REGISTERS);
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    ASSERT(i < REGION_REGISTERS);
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    asm volatile ("mov %0 = rr[%1]\n" : "=r" (ret) : "r" (i << VRN_SHIFT));
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    asm volatile ("mov %0 = rr[%1]\n" : "=r" (ret) : "r" (i << VRN_SHIFT));
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    return ret;
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    return ret;
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/** Write Region Register.
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/** Write Region Register.
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 *
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 *
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 * @param i Region register index.
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 * @param i Region register index.
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 * @param v Value to be written to rr[i].
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 * @param v Value to be written to rr[i].
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 */
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 */
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static inline void rr_write(index_t i, uint64_t v)
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static inline void rr_write(size_t i, uint64_t v)
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{
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{
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    ASSERT(i < REGION_REGISTERS);
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    ASSERT(i < REGION_REGISTERS);
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    asm volatile (
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    asm volatile (
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        "mov rr[%0] = %1\n"
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        "mov rr[%0] = %1\n"
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        :
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        :