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6840dd8263
Bit manipulation code was updated but comments related to it were not. This commit updates the comments for the main macros, GET/SETFIELD, to make them match the code. Signed-off-by: Gustavo Romero <gromero@linux.ibm.com> Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
43 lines
1.4 KiB
C
43 lines
1.4 KiB
C
// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
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/* Copyright 2013-2016 IBM Corp. */
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#ifndef __BITUTILS_H
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#define __BITUTILS_H
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/* PPC bit number conversion */
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#ifdef __ASSEMBLY__
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#define PPC_BIT(bit) (0x8000000000000000 >> (bit))
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#define PPC_BIT32(bit) (0x80000000 >> (bit))
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#define PPC_BIT16(bit) (0x8000 >> (bit))
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#define PPC_BIT8(bit) (0x80 >> (bit))
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#else
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#define PPC_BIT(bit) (0x8000000000000000UL >> (bit))
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#define PPC_BIT32(bit) (0x80000000UL >> (bit))
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#define PPC_BIT16(bit) (0x8000UL >> (bit))
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#define PPC_BIT8(bit) (0x80UL >> (bit))
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#endif
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#define PPC_BITMASK(bs,be) ((PPC_BIT(bs) - PPC_BIT(be)) | PPC_BIT(bs))
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#define PPC_BITMASK32(bs,be) ((PPC_BIT32(bs) - PPC_BIT32(be))|PPC_BIT32(bs))
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#define PPC_BITMASK16(bs,be) ((PPC_BIT16(bs) - PPC_BIT16(be))|PPC_BIT16(bs))
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#define PPC_BITMASK8(bs,be) ((PPC_BIT8(bs) - PPC_BIT8(be))|PPC_BIT8(bs))
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#define PPC_BITLSHIFT(be) (63 - (be))
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#define PPC_BITLSHIFT32(be) (31 - (be))
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/*
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* PPC bitmask field manipulation
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*/
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/* Find left shift from first set bit in mask */
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#define MASK_TO_LSH(m) (__builtin_ffsl(m) - 1)
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/* Extract field from 'v' according to mask 'm' */
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#define GETFIELD(m, v) (((v) & (m)) >> MASK_TO_LSH(m))
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/* Set field specified by mask 'm' of 'v' to value 'val'
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* NOTE: 'v' isn't modified, the combined result is returned
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*/
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#define SETFIELD(m, v, val) \
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(((v) & ~(m)) | ((((typeof(v))(val)) << MASK_TO_LSH(m)) & (m)))
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#endif /* __BITUTILS_H */
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