6ff4826492
Ref to https://github.com/torvalds/linux/blob/master/include/linux/bits.h Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>
97 lines
3.2 KiB
C
97 lines
3.2 KiB
C
/****************************************************************************
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* include/nuttx/bits.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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#ifndef __INCLUDE_NUTTX_BITS_H
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#define __INCLUDE_NUTTX_BITS_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <assert.h>
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#include <inttypes.h>
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#include <stdint.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef BITS_PER_BYTE
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# define BITS_PER_BYTE 8
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#endif
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#if UINTPTR_MAX > UINT32_MAX
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# define BITS_PER_LONG 64
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#else
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# define BITS_PER_LONG 32
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#endif
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#ifndef BITS_PER_LONG_LONG
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# define BITS_PER_LONG_LONG 64
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#endif
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#define BIT_MASK(nr) (UINT32_C(1) << ((nr) % BITS_PER_LONG))
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#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
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#define BIT_ULL_MASK(nr) (UINT64_C(1) << ((nr) % BITS_PER_LONG_LONG))
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#define BIT_ULL_WORD(nr) ((nr) / BITS_PER_LONG_LONG)
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/* Create a contiguous bitmask starting at bit position @l and ending at
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* position @h. For example
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* GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000.
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*/
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#define __GENMASK(h, l) \
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(((~UINT32_C(0)) - (UINT32_C(1) << (l)) + 1) & \
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(~UINT32_C(0) >> (BITS_PER_LONG - 1 - (h))))
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#define GENMASK(h, l) \
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(BUILD_BUG_ON_ZERO((l) > (h)) + __GENMASK(h, l))
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#define __GENMASK_ULL(h, l) \
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(((~UINT64_C(0)) - (UINT64_C(1) << (l)) + 1) & \
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(~UINT64_C(0) >> (BITS_PER_LONG_LONG - 1 - (h))))
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#define GENMASK_ULL(h, l) \
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(BUILD_BUG_ON_ZERO((l) > (h)) + __GENMASK_ULL(h, l))
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/****************************************************************************
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* Type Definitions
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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#ifdef __cplusplus
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#define EXTERN extern "C"
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extern "C"
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{
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#else
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#define EXTERN extern
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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#undef EXTERN
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#ifdef __cplusplus
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}
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#endif
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#endif /* __INCLUDE_NUTTX_BITS_H */
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