86 lines
2.7 KiB
C
86 lines
2.7 KiB
C
/*
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* Copyright (C) 2018, STMicroelectronics - All Rights Reserved
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* Author(s): Antonio Borneo <borneo.antonio@gmail.com> for STMicroelectronics
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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* The content of this file is mainly copied/inspired from Linux kernel
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* code in include/linux/types.h include/linux/bitmap.h include/linux/bitops.h
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*/
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#ifndef OPENOCD_HELPER_BITS_H
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#define OPENOCD_HELPER_BITS_H
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#include <helper/replacements.h>
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#include <helper/types.h>
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#define BIT(nr) (1UL << (nr))
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#define BITS_PER_BYTE 8
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#define BITS_PER_LONG (BITS_PER_BYTE * sizeof(long))
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#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
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#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
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#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
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#define DECLARE_BITMAP(name, bits) unsigned long name[BITS_TO_LONGS(bits)]
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/**
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* bitmap_zero - Clears all the bits in memory
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* @param dst the address of the bitmap
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* @param nbits the number of bits to clear
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*/
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static inline void bitmap_zero(unsigned long *dst, unsigned int nbits)
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{
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unsigned int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
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memset(dst, 0, len);
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}
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/**
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* clear_bit - Clear a bit in memory
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* @param nr the bit to set
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* @param addr the address to start counting from
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*/
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static inline void clear_bit(unsigned int nr, volatile unsigned long *addr)
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{
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unsigned long mask = BIT_MASK(nr);
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unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
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*p &= ~mask;
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}
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/**
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* set_bit - Set a bit in memory
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* @param nr the bit to set
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* @param addr the address to start counting from
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*/
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static inline void set_bit(unsigned int nr, volatile unsigned long *addr)
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{
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unsigned long mask = BIT_MASK(nr);
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unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
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*p |= mask;
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}
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/**
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* test_bit - Determine whether a bit is set
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* @param nr bit number to test
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* @param addr Address to start counting from
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*/
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static inline int test_bit(unsigned int nr, const volatile unsigned long *addr)
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{
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return 1UL & (addr[BIT_WORD(nr)] >> (nr % BITS_PER_LONG));
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}
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#endif /* OPENOCD_HELPER_BITS_H */
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