linux/include/linux/bits.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_BITS_H
#define __LINUX_BITS_H

#include <linux/const.h>
#include <vdso/bits.h>
#include <uapi/linux/bits.h>
#include <asm/bitsperlong.h>

#define BIT_MASK(nr) …
#define BIT_WORD(nr) …
#define BIT_ULL_MASK(nr) …
#define BIT_ULL_WORD(nr) …
#define BITS_PER_BYTE …

/*
 * Create a contiguous bitmask starting at bit position @l and ending at
 * position @h. For example
 * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000.
 */
#if !defined(__ASSEMBLY__)
#include <linux/build_bug.h>
#define GENMASK_INPUT_CHECK …
#else
/*
 * BUILD_BUG_ON_ZERO is not available in h files included from asm files,
 * disable the input check if that is the case.
 */
#define GENMASK_INPUT_CHECK(h, l) …
#endif

#define GENMASK(h, l) …
#define GENMASK_ULL(h, l) …

#if !defined(__ASSEMBLY__)
/*
 * Missing asm support
 *
 * __GENMASK_U128() depends on _BIT128() which would not work
 * in the asm code, as it shifts an 'unsigned __init128' data
 * type instead of direct representation of 128 bit constants
 * such as long and unsigned long. The fundamental problem is
 * that a 128 bit constant will get silently truncated by the
 * gcc compiler.
 */
#define GENMASK_U128 …
#endif

#endif	/* __LINUX_BITS_H */