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Rev 3993 Rev 4130
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    asm volatile ("rdpr %%tick, %0\n" : "=r" (v));
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    asm volatile ("rdpr %%tick, %0\n" : "=r" (v));
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    return v;
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    return v;
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}
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}
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/** Write TICK Register.
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 *
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 * @param v New value of TICK register.
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 */
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static inline void tick_write(uint64_t v)
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{
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    asm volatile ("wrpr %0, %1, %%tick\n" : : "r" (v), "i" (0));
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}
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/** Read FPRS Register.
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/** Read FPRS Register.
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 *
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 *
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 * @return Value of FPRS register.
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 * @return Value of FPRS register.
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 */
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 */
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static inline uint64_t fprs_read(void)
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static inline uint64_t fprs_read(void)
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    asm volatile ("add %%sp, %1, %0\n" : "=r" (unbiased_sp) : "i" (STACK_BIAS));
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    asm volatile ("add %%sp, %1, %0\n" : "=r" (unbiased_sp) : "i" (STACK_BIAS));
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    return ALIGN_DOWN(unbiased_sp, STACK_SIZE);
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    return ALIGN_DOWN(unbiased_sp, STACK_SIZE);
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}
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}
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/** Read Version Register.
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 *
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 * @return Value of VER register.
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 */
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static inline uint64_t ver_read(void)
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{
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    uint64_t v;
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    asm volatile ("rdpr %%ver, %0\n" : "=r" (v));
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    return v;
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}
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/** Read Trap Program Counter register.
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/** Read Trap Program Counter register.
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 *
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 *
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 * @return Current value in TPC.
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 * @return Current value in TPC.
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 */
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 */
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static inline uint64_t tpc_read(void)
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static inline uint64_t tpc_read(void)