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    __asm__ volatile ("and %0 = %1, r12" : "=r" (v) : "r" (~(STACK_SIZE-1)));
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    __asm__ volatile ("and %0 = %1, r12" : "=r" (v) : "r" (~(STACK_SIZE-1)));
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    return v;
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    return v;
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}
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}
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/** Read IVR (External Interrupt Vector Register)
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 *
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 * @return Highest priority, pending, unmasked external interrupt vector.
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 */
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static inline __u8 read_ivr(void)
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{
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    __u64 v;
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    __asm__ volatile ("mov %0 = cr65\n" : "=r" (v));
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    return (__u8) (v & 0xf);
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}
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void cpu_sleep(void);
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void cpu_sleep(void);
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void asm_delay_loop(__u32 t);
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void asm_delay_loop(__u32 t);
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