LXR linux/arch/riscv/include/asm/word-at-a-time.h

   1/* SPDX-License-Identifier: GPL-2.0-only */
   2/*
   3 * Copyright (C) 2012 Regents of the University of California
   4 *
   5 * Derived from arch/x86/include/asm/word-at-a-time.h
   6 */
   7
   8#ifndef _ASM_RISCV_WORD_AT_A_TIME_H
   9#define _ASM_RISCV_WORD_AT_A_TIME_H
  10
  11
  12#include <linux/kernel.h>
  13
  14struct word_at_a_time {
  15        const unsigned long one_bits, high_bits;
  16};
  17
  18#define WORD_AT_A_TIME_CONSTANTS { REPEAT_BYTE(0x01), REPEAT_BYTE(0x80) }
  19
  20static inline unsigned long has_zero(unsigned long val,
  21        unsigned long *bits, const struct word_at_a_time *c)
  22{
  23        unsigned long mask = ((val - c->one_bits) & ~val) & c->high_bits;
  24        *bits = mask;
  25        return mask;
  26}
  27
  28static inline unsigned long prep_zero_mask(unsigned long val,
  29        unsigned long bits, const struct word_at_a_time *c)
  30{
  31        return bits;
  32}
  33
  34static inline unsigned long create_zero_mask(unsigned long bits)
  35{
  36        bits = (bits - 1) & ~bits;
  37        return bits >> 7;
  38}
  39
  40static inline unsigned long find_zero(unsigned long mask)
  41{
  42        return fls64(mask) >> 3;
  43}
  44
  45/* The mask we created is directly usable as a bytemask */
  46#define zero_bytemask(mask) (mask)
  47
  48#endif /* _ASM_RISCV_WORD_AT_A_TIME_H */
  49