69 lines
1.6 KiB
C
Executable File
69 lines
1.6 KiB
C
Executable File
/*
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*********************************************************************************************************
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* LINUX-KERNEL
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* AllWinner Linux Platform Develop Kits
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* Kernel Module
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*
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* (c) Copyright 2006-2011, kevin.z China
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* All Rights Reserved
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*
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* File : common.h
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* By : kevin.z
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* Version : v1.0
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* Date : 2011-5-30 17:21
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* Descript: common lib for mem.
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* Update : date auther ver notes
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*********************************************************************************************************
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*/
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#ifndef __COMMON_H__
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#define __COMMON_H__
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static inline __u64 mem_uldiv(__u64 dividend, __u32 divisior)
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{
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__u64 tmpDiv = (__u64)divisior;
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__u64 tmpQuot = 0;
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__s32 shift = 0;
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if(!divisior)
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{
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/* divide 0 error abort */
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return 0;
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}
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while(!(tmpDiv & ((__u64)1<<63)))
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{
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tmpDiv <<= 1;
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shift ++;
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}
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do
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{
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if(dividend >= tmpDiv)
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{
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dividend -= tmpDiv;
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tmpQuot = (tmpQuot << 1) | 1;
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}
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else
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{
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tmpQuot = (tmpQuot << 1) | 0;
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}
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tmpDiv >>= 1;
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shift --;
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} while(shift >= 0);
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return tmpQuot;
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}
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void mem_memcpy(void *dest, void *src, int n);
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/*notice: all the delay cycle is measured by 60M hz
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*when in super mem, the os is running in 1008M
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*so, the delay cycle need reconsideration.
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*/
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void mem_delay(int cycle);
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#endif //__COMMON_H__
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