cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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word-at-a-time.h (1104B)

      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 */