include/bitutils.h

/* Copyright 2013-2014 IBM Corp.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * 	http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef __BITUTILS_H
#define __BITUTILS_H

/* PPC bit number conversion */
#ifdef __ASSEMBLY__
#define PPC_BIT(bit)		(0x8000000000000000 >> (bit))
#define PPC_BIT32(bit)		(0x80000000 >> (bit))
#define PPC_BIT16(bit)		(0x8000 >> (bit))
#define PPC_BIT8(bit)		(0x80 >> (bit))
#else
#define PPC_BIT(bit)		(0x8000000000000000UL >> (bit))
#define PPC_BIT32(bit)		(0x80000000UL >> (bit))
#define PPC_BIT16(bit)		(0x8000UL >> (bit))
#define PPC_BIT8(bit)		(0x80UL >> (bit))
#endif
#define PPC_BITMASK(bs,be)	((PPC_BIT(bs) - PPC_BIT(be)) | PPC_BIT(bs))
#define PPC_BITMASK32(bs,be)	((PPC_BIT32(bs) - PPC_BIT32(be))|PPC_BIT32(bs))
#define PPC_BITMASK16(bs,be)	((PPC_BIT16(bs) - PPC_BIT16(be))|PPC_BIT16(bs))
#define PPC_BITMASK8(bs,be)	((PPC_BIT8(bs) - PPC_BIT8(be))|PPC_BIT8(bs))
#define PPC_BITLSHIFT(be)	(63 - (be))
#define PPC_BITLSHIFT32(be)	(31 - (be))

/*
 * PPC bitmask field manipulation
 */

/* Find left shift from first set bit in mask */
#define MASK_TO_LSH(m)		(__builtin_ffsl(m) - 1)

/* Extract field fname from val */
#define GETFIELD(m, v)		(((v) & (m)) >> MASK_TO_LSH(m))

/* Set field fname of oval to fval
 * NOTE: oval isn't modified, the combined result is returned
 */
#define SETFIELD(m, v, val)				\
	(((v) & ~(m)) |	((((typeof(v))(val)) << MASK_TO_LSH(m)) & (m)))

#endif /* __BITUTILS_H */