71 lines
1.3 KiB
C
71 lines
1.3 KiB
C
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/*
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* File : cpuport.c
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* This file is part of RT-Thread RTOS
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* COPYRIGHT (C) 2013, RT-Thread Develop Team
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*
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* Change Logs:
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* Date Author Notes
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*/
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#include <rthw.h>
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#include <rtthread.h>
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extern void machine_reset(void);
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extern void machine_shutdown(void);
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/**
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* shutdown CPU
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*
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*/
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void rt_hw_cpu_shutdown()
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{
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rt_uint32_t level;
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rt_kprintf("shutdown...\n");
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level = rt_hw_interrupt_disable();
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machine_shutdown();
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while (level)
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{
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RT_ASSERT(0);
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}
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}
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#ifdef RT_USING_CPU_FFS
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/**
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* This function finds the first bit set (beginning with the least significant bit)
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* in value and return the index of that bit.
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*
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* Bits are numbered starting at 1 (the least significant bit). A return value of
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* zero from any of these functions means that the argument was zero.
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*
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* @return return the index of the first bit set. If value is 0, then this function
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* shall return 0.
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*/
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#if defined(__CC_ARM)
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int __rt_ffs(int value)
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{
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register rt_uint32_t x;
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if (value == 0)
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return value;
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__asm
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{
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rsb x, value, #0
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and x, x, value
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clz x, x
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rsb x, x, #32
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}
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return x;
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}
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#elif defined(__GNUC__) || defined(__ICCARM__)
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int __rt_ffs(int value)
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{
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return __builtin_ffs(value);
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}
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#endif
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#endif
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