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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bitops.h (1119B)

      1/* SPDX-License-Identifier: GPL-2.0-only */
      2/* -*- linux-c -*- ------------------------------------------------------- *
      3 *
      4 *   Copyright (C) 1991, 1992 Linus Torvalds
      5 *   Copyright 2007 rPath, Inc. - All Rights Reserved
      6 *
      7 * ----------------------------------------------------------------------- */
      8
      9/*
     10 * Very simple bitops for the boot code.
     11 */
     12
     13#ifndef BOOT_BITOPS_H
     14#define BOOT_BITOPS_H
     15#define _LINUX_BITOPS_H		/* Inhibit inclusion of <linux/bitops.h> */
     16
     17#include <linux/types.h>
     18#include <asm/asm.h>
     19
     20static inline bool constant_test_bit(int nr, const void *addr)
     21{
     22	const u32 *p = (const u32 *)addr;
     23	return ((1UL << (nr & 31)) & (p[nr >> 5])) != 0;
     24}
     25static inline bool variable_test_bit(int nr, const void *addr)
     26{
     27	bool v;
     28	const u32 *p = (const u32 *)addr;
     29
     30	asm("btl %2,%1" CC_SET(c) : CC_OUT(c) (v) : "m" (*p), "Ir" (nr));
     31	return v;
     32}
     33
     34#define test_bit(nr,addr) \
     35(__builtin_constant_p(nr) ? \
     36 constant_test_bit((nr),(addr)) : \
     37 variable_test_bit((nr),(addr)))
     38
     39static inline void set_bit(int nr, void *addr)
     40{
     41	asm("btsl %1,%0" : "+m" (*(u32 *)addr) : "Ir" (nr));
     42}
     43
     44#endif /* BOOT_BITOPS_H */