/* * Copyright (C) 2012 Regents of the University of California * * 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. See the * GNU General Public License for more details. * Derived from arch/x86/include/asm/word-at-a-time.h */ #ifndef _ASM_RISCV_WORD_AT_A_TIME_H #define _ASM_RISCV_WORD_AT_A_TIME_H #include <linux/kernel.h> struct word_at_a_time { const unsigned long one_bits, high_bits; }; #define WORD_AT_A_TIME_CONSTANTS { REPEAT_BYTE(0x01), REPEAT_BYTE(0x80) } static inline unsigned long has_zero(unsigned long val, unsigned long *bits, const struct word_at_a_time *c) { unsigned long mask = ((val - c->one_bits) & ~val) & c->high_bits; *bits = mask; return mask; } static inline unsigned long prep_zero_mask(unsigned long val, unsigned long bits, const struct word_at_a_time *c) { return bits; } static inline unsigned long create_zero_mask(unsigned long bits) { bits = (bits - 1) & ~bits; return bits >> 7; } static inline unsigned long find_zero(unsigned long mask) { return fls64(mask) >> 3; } /* The mask we created is directly usable as a bytemask */ #define zero_bytemask(mask) (mask) #endif /* _ASM_RISCV_WORD_AT_A_TIME_H */