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helper: add bitmap helper primitives

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Mainly copied/inspired from Linux kernel code in
- include/linux/types.h
- include/linux/bitmap.h
- include/linux/bitops.h

Change-Id: I317b542993ab81530c86553f339b79505d0fef0f
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-on: http://openocd.zylin.com/4894
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>
This commit is contained in:
Antonio Borneo 2019-01-28 18:22:21 +01:00 committed by Tomas Vanek
parent e26910fdad
commit e5177a5ad4
2 changed files with 85 additions and 0 deletions
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1
src/helper/Makefile.am
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@ -16,6 +16,7 @@ noinst_LTLIBRARIES += %D%/libhelper.la
%D%/jep106.c \
%D%/jim-nvp.c \
%D%/binarybuffer.h \
%D%/bits.h \
%D%/configuration.h \
%D%/ioutil.h \
%D%/list.h \

84
src/helper/bits.h Normal file
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@ -0,0 +1,84 @@
/*
* Copyright (C) 2018, STMicroelectronics - All Rights Reserved
* Author(s): Antonio Borneo <borneo.antonio@gmail.com> for STMicroelectronics
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* The content of this file is mainly copied/inspired from Linux kernel
* code in include/linux/types.h include/linux/bitmap.h include/linux/bitops.h
*/
#ifndef OPENOCD_HELPER_BITS_H
#define OPENOCD_HELPER_BITS_H
#include <helper/types.h>
#define BIT(nr) (1UL << (nr))
#define BITS_PER_BYTE 8
#define BITS_PER_LONG (BITS_PER_BYTE * sizeof(long))
#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
#define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
#define DECLARE_BITMAP(name, bits) unsigned long name[BITS_TO_LONGS(bits)]
/**
* bitmap_zero - Clears all the bits in memory
* @dst: the address of the bitmap
* @nbits: the number of bits to clear
*/
static inline void bitmap_zero(unsigned long *dst, unsigned int nbits)
{
unsigned int len = BITS_TO_LONGS(nbits) * sizeof(unsigned long);
memset(dst, 0, len);
}
/**
* clear_bit - Clear a bit in memory
* @nr: the bit to set
* @addr: the address to start counting from
*/
static inline void clear_bit(unsigned int nr, volatile unsigned long *addr)
{
unsigned long mask = BIT_MASK(nr);
unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
*p &= ~mask;
}
/**
* set_bit - Set a bit in memory
* @nr: the bit to set
* @addr: the address to start counting from
*/
static inline void set_bit(unsigned int nr, volatile unsigned long *addr)
{
unsigned long mask = BIT_MASK(nr);
unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
*p |= mask;
}
/**
* test_bit - Determine whether a bit is set
* @nr: bit number to test
* @addr: Address to start counting from
*/
static inline int test_bit(unsigned int nr, const volatile unsigned long *addr)
{
return 1UL & (addr[BIT_WORD(nr)] >> (nr % BITS_PER_LONG));
}
#endif /* OPENOCD_HELPER_BITS_H */