sys_bitops.h

Go to the documentation of this file.

/*
 * Copyright (c) 2020, Wind River Systems, Inc.
 * Copyright (c) 2017, Oticon A/S
 * Copyright (c) 2020, Synopsys
 *
 * SPDX-License-Identifier: Apache-2.0
 */
 
/* Memory bits manipulation functions in non-arch-specific C code */
 
#ifndef ZEPHYR_INCLUDE_ARCH_COMMON_SYS_BITOPS_H_
#define ZEPHYR_INCLUDE_ARCH_COMMON_SYS_BITOPS_H_
 
#ifndef _ASMLANGUAGE
 
#include <toolchain.h>
#include <zephyr/types.h>
#include <sys/sys_io.h>
 
#ifdef __cplusplus
extern "C" {
#endif
 
static ALWAYS_INLINE void sys_set_bit(mem_addr_t addr, unsigned int bit)
{
        uint32_t temp = *(volatile uint32_t *)addr;
 
        *(volatile uint32_t *)addr = temp | (1 << bit);
}
 
static ALWAYS_INLINE void sys_clear_bit(mem_addr_t addr, unsigned int bit)
{
        uint32_t temp = *(volatile uint32_t *)addr;
 
        *(volatile uint32_t *)addr = temp & ~(1 << bit);
}
 
static ALWAYS_INLINE int sys_test_bit(mem_addr_t addr, unsigned int bit)
{
        uint32_t temp = *(volatile uint32_t *)addr;
 
        return temp & (1 << bit);
}
 
static ALWAYS_INLINE
        void sys_bitfield_set_bit(mem_addr_t addr, unsigned int bit)
{
        /* Doing memory offsets in terms of 32-bit values to prevent
         * alignment issues
         */
        sys_set_bit(addr + ((bit >> 5) << 2), bit & 0x1F);
}
 
static ALWAYS_INLINE
        void sys_bitfield_clear_bit(mem_addr_t addr, unsigned int bit)
{
        sys_clear_bit(addr + ((bit >> 5) << 2), bit & 0x1F);
}
 
static ALWAYS_INLINE
        int sys_bitfield_test_bit(mem_addr_t addr, unsigned int bit)
{
        return sys_test_bit(addr + ((bit >> 5) << 2), bit & 0x1F);
}
 
static ALWAYS_INLINE
        int sys_test_and_set_bit(mem_addr_t addr, unsigned int bit)
{
        int ret;
 
        ret = sys_test_bit(addr, bit);
        sys_set_bit(addr, bit);
 
        return ret;
}
 
static ALWAYS_INLINE
        int sys_test_and_clear_bit(mem_addr_t addr, unsigned int bit)
{
        int ret;
 
        ret = sys_test_bit(addr, bit);
        sys_clear_bit(addr, bit);
 
        return ret;
}
 
static ALWAYS_INLINE
        int sys_bitfield_test_and_set_bit(mem_addr_t addr, unsigned int bit)
{
        int ret;
 
        ret = sys_bitfield_test_bit(addr, bit);
        sys_bitfield_set_bit(addr, bit);
 
        return ret;
}
 
static ALWAYS_INLINE
        int sys_bitfield_test_and_clear_bit(mem_addr_t addr, unsigned int bit)
{
        int ret;
 
        ret = sys_bitfield_test_bit(addr, bit);
        sys_bitfield_clear_bit(addr, bit);
 
        return ret;
}
 
#ifdef __cplusplus
}
#endif
 
#endif /* _ASMLANGUAGE */
 
#endif /* ZEPHYR_INCLUDE_ARCH_COMMON_SYS_BITOPS_H_ */