70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
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/*
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* Copyright (c) 2007-2017 Allwinnertech Co., Ltd.
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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/*
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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 standby.
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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 standby_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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/* 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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tmpDiv <<= 1;
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shift++;
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}
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do {
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if (dividend >= tmpDiv) {
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dividend -= tmpDiv;
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tmpQuot = (tmpQuot << 1) | 1;
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} else {
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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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;
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return tmpQuot;
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}
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void standby_memcpy(void *dest, void *src, int n);
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void standby_delay_cycle(int cycle);
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#endif /*__COMMON_H__*/
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