cregit-Linux how code gets into the kernel

Release 4.14 arch/x86/boot/bitops.h

Directory: arch/x86/boot
/* -*- linux-c -*- ------------------------------------------------------- *
 *
 *   Copyright (C) 1991, 1992 Linus Torvalds
 *   Copyright 2007 rPath, Inc. - All Rights Reserved
 *
 *   This file is part of the Linux kernel, and is made available under
 *   the terms of the GNU General Public License version 2.
 *
 * ----------------------------------------------------------------------- */

/*
 * Very simple bitops for the boot code.
 */

#ifndef BOOT_BITOPS_H

#define BOOT_BITOPS_H

#define _LINUX_BITOPS_H		
/* Inhibit inclusion of <linux/bitops.h> */

#include <linux/types.h>


static inline bool constant_test_bit(int nr, const void *addr) { const u32 *p = (const u32 *)addr; return ((1UL << (nr & 31)) & (p[nr >> 5])) != 0; }

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static inline bool variable_test_bit(int nr, const void *addr) { bool v; const u32 *p = (const u32 *)addr; asm("btl %2,%1; setc %0" : "=qm" (v) : "m" (*p), "Ir" (nr)); return v; }

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H. Peter Anvin34100.00%2100.00%
Total34100.00%2100.00%

#define test_bit(nr,addr) \ (__builtin_constant_p(nr) ? \ constant_test_bit((nr),(addr)) : \ variable_test_bit((nr),(addr)))
static inline void set_bit(int nr, void *addr) { asm("btsl %1,%0" : "+m" (*(u32 *)addr) : "Ir" (nr)); }

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#endif /* BOOT_BITOPS_H */

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H. Peter Anvin12799.22%266.67%
Américo Wang10.78%133.33%
Total128100.00%3100.00%
Directory: arch/x86/boot
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