[mirror_ubuntu-artful-kernel.git] / arch / tile / lib / string-endian.h

/*
 * Copyright 2011 Tilera Corporation. All Rights Reserved.
 *
 *   This program is free software; you can redistribute it and/or
 *   modify it under the terms of the GNU General Public License
 *   as published by the Free Software Foundation, version 2.
 *
 *   This program is distributed in the hope that it will be useful, but
 *   WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 *   NON INFRINGEMENT.  See the GNU General Public License for
 *   more details.
 *
 * Provide a mask based on the pointer alignment that
 * sets up non-zero bytes before the beginning of the string.
 * The MASK expression works because shift counts are taken mod 64.
 * Also, specify how to count "first" and "last" bits
 * when the bits have been read as a word.
 */

#include <asm/byteorder.h>

#ifdef __LITTLE_ENDIAN
#define MASK(x) (__insn_shl(1ULL, (x << 3)) - 1)
#define NULMASK(x) ((2ULL << x) - 1)
#define CFZ(x) __insn_ctz(x)
#define REVCZ(x) __insn_clz(x)
#else
#define MASK(x) (__insn_shl(-2LL, ((-x << 3) - 1)))
#define NULMASK(x) (-2LL << (63 - x))
#define CFZ(x) __insn_clz(x)
#define REVCZ(x) __insn_ctz(x)
#endif
Commit	Line	Data
1efea40d CM	1	/*
	2	* Copyright 2011 Tilera Corporation. All Rights Reserved.
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation, version 2.
	7	*
	8	* This program is distributed in the hope that it will be useful, but
	9	* WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
	11	* NON INFRINGEMENT. See the GNU General Public License for
	12	* more details.
	13	*
	14	* Provide a mask based on the pointer alignment that
	15	* sets up non-zero bytes before the beginning of the string.
	16	* The MASK expression works because shift counts are taken mod 64.
	17	* Also, specify how to count "first" and "last" bits
	18	* when the bits have been read as a word.
	19	*/
	20
	21	#include <asm/byteorder.h>
	22
	23	#ifdef __LITTLE_ENDIAN
	24	#define MASK(x) (__insn_shl(1ULL, (x << 3)) - 1)
	25	#define NULMASK(x) ((2ULL << x) - 1)
	26	#define CFZ(x) __insn_ctz(x)
	27	#define REVCZ(x) __insn_clz(x)
	28	#else
	29	#define MASK(x) (__insn_shl(-2LL, ((-x << 3) - 1)))
	30	#define NULMASK(x) (-2LL << (63 - x))
	31	#define CFZ(x) __insn_clz(x)
	32	#define REVCZ(x) __insn_ctz(x)
	33	#endif