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rte_bitops.h
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rte_bitops.h
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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright(c) 2020 Arm Limited
*/
#ifndef _RTE_BITOPS_H_
#define _RTE_BITOPS_H_
/**
* @file
* Bit Operations
*
* This file defines a family of APIs for bit operations
* without enforcing memory ordering.
*/
#include <stdint.h>
#include <rte_debug.h>
#include <rte_compat.h>
/*------------------------ 32-bit relaxed operations ------------------------*/
/**
* @warning
* @b EXPERIMENTAL: this API may change, or be removed, without prior notice
*
* Get the target bit from a 32-bit value without memory ordering.
*
* @param nr
* The target bit to get.
* @param addr
* The address holding the bit.
* @return
* The target bit.
*/
__rte_experimental
static inline uint32_t
rte_bit_relaxed_get32(unsigned int nr, volatile uint32_t *addr)
{
RTE_ASSERT(nr < 32);
uint32_t mask = UINT32_C(1) << nr;
return (*addr) & mask;
}
/**
* @warning
* @b EXPERIMENTAL: this API may change, or be removed, without prior notice
*
* Set the target bit in a 32-bit value to 1 without memory ordering.
*
* @param nr
* The target bit to set.
* @param addr
* The address holding the bit.
*/
__rte_experimental
static inline void
rte_bit_relaxed_set32(unsigned int nr, volatile uint32_t *addr)
{
RTE_ASSERT(nr < 32);
uint32_t mask = UINT32_C(1) << nr;
*addr = (*addr) | mask;
}
/**
* @warning
* @b EXPERIMENTAL: this API may change, or be removed, without prior notice
*
* Clear the target bit in a 32-bit value to 0 without memory ordering.
*
* @param nr
* The target bit to clear.
* @param addr
* The address holding the bit.
*/
__rte_experimental
static inline void
rte_bit_relaxed_clear32(unsigned int nr, volatile uint32_t *addr)
{
RTE_ASSERT(nr < 32);
uint32_t mask = UINT32_C(1) << nr;
*addr = (*addr) & (~mask);
}
/**
* @warning
* @b EXPERIMENTAL: this API may change, or be removed, without prior notice
*
* Return the original bit from a 32-bit value, then set it to 1 without
* memory ordering.
*
* @param nr
* The target bit to get and set.
* @param addr
* The address holding the bit.
* @return
* The original bit.
*/
__rte_experimental
static inline uint32_t
rte_bit_relaxed_test_and_set32(unsigned int nr, volatile uint32_t *addr)
{
RTE_ASSERT(nr < 32);
uint32_t mask = UINT32_C(1) << nr;
uint32_t val = *addr;
*addr = val | mask;
return val & mask;
}
/**
* @warning
* @b EXPERIMENTAL: this API may change, or be removed, without prior notice
*
* Return the original bit from a 32-bit value, then clear it to 0 without
* memory ordering.
*
* @param nr
* The target bit to get and clear.
* @param addr
* The address holding the bit.
* @return
* The original bit.
*/
__rte_experimental
static inline uint32_t
rte_bit_relaxed_test_and_clear32(unsigned int nr, volatile uint32_t *addr)
{
RTE_ASSERT(nr < 32);
uint32_t mask = UINT32_C(1) << nr;
uint32_t val = *addr;
*addr = val & (~mask);
return val & mask;
}
/*------------------------ 64-bit relaxed operations ------------------------*/
/**
* @warning
* @b EXPERIMENTAL: this API may change, or be removed, without prior notice
*
* Get the target bit from a 64-bit value without memory ordering.
*
* @param nr
* The target bit to get.
* @param addr
* The address holding the bit.
* @return
* The target bit.
*/
__rte_experimental
static inline uint64_t
rte_bit_relaxed_get64(unsigned int nr, volatile uint64_t *addr)
{
RTE_ASSERT(nr < 64);
uint64_t mask = UINT64_C(1) << nr;
return (*addr) & mask;
}
/**
* @warning
* @b EXPERIMENTAL: this API may change, or be removed, without prior notice
*
* Set the target bit in a 64-bit value to 1 without memory ordering.
*
* @param nr
* The target bit to set.
* @param addr
* The address holding the bit.
*/
__rte_experimental
static inline void
rte_bit_relaxed_set64(unsigned int nr, volatile uint64_t *addr)
{
RTE_ASSERT(nr < 64);
uint64_t mask = UINT64_C(1) << nr;
(*addr) = (*addr) | mask;
}
/**
* @warning
* @b EXPERIMENTAL: this API may change, or be removed, without prior notice
*
* Clear the target bit in a 64-bit value to 0 without memory ordering.
*
* @param nr
* The target bit to clear.
* @param addr
* The address holding the bit.
*/
__rte_experimental
static inline void
rte_bit_relaxed_clear64(unsigned int nr, volatile uint64_t *addr)
{
RTE_ASSERT(nr < 64);
uint64_t mask = UINT64_C(1) << nr;
*addr = (*addr) & (~mask);
}
/**
* @warning
* @b EXPERIMENTAL: this API may change, or be removed, without prior notice
*
* Return the original bit from a 64-bit value, then set it to 1 without
* memory ordering.
*
* @param nr
* The target bit to get and set.
* @param addr
* The address holding the bit.
* @return
* The original bit.
*/
__rte_experimental
static inline uint64_t
rte_bit_relaxed_test_and_set64(unsigned int nr, volatile uint64_t *addr)
{
RTE_ASSERT(nr < 64);
uint64_t mask = UINT64_C(1) << nr;
uint64_t val = *addr;
*addr = val | mask;
return val;
}
/**
* @warning
* @b EXPERIMENTAL: this API may change, or be removed, without prior notice
*
* Return the original bit from a 64-bit value, then clear it to 0 without
* memory ordering.
*
* @param nr
* The target bit to get and clear.
* @param addr
* The address holding the bit.
* @return
* The original bit.
*/
__rte_experimental
static inline uint64_t
rte_bit_relaxed_test_and_clear64(unsigned int nr, volatile uint64_t *addr)
{
RTE_ASSERT(nr < 64);
uint64_t mask = UINT64_C(1) << nr;
uint64_t val = *addr;
*addr = val & (~mask);
return val & mask;
}
#endif /* _RTE_BITOPS_H_ */