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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
/*
 *  arch/arm/include/asm/byteorder.h
 *
 * ARM Endian-ness.  In little endian mode, the data bus is connected such
 * that byte accesses appear as:
 *  0 = d0...d7, 1 = d8...d15, 2 = d16...d23, 3 = d24...d31
 * and word accesses (data or instruction) appear as:
 *  d0...d31
 *
 * When in big endian mode, byte accesses appear as:
 *  0 = d24...d31, 1 = d16...d23, 2 = d8...d15, 3 = d0...d7
 * and word accesses (data or instruction) appear as:
 *  d0...d31
 */
#ifndef _UAPI__ASM_ARM_SWAB_H
#define _UAPI__ASM_ARM_SWAB_H

#include <linux/compiler.h>
#include <linux/types.h>

#if !defined(__STRICT_ANSI__) || defined(__KERNEL__)
#  define __SWAB_64_THRU_32__
#endif


#if !defined(__KERNEL__) || __LINUX_ARM_ARCH__ < 6
static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
{
	__u32 t;

#ifndef __thumb__
	if (!__builtin_constant_p(x)) {
		/*
		 * The compiler needs a bit of a hint here to always do the
		 * right thing and not screw it up to different degrees
		 * depending on the gcc version.
		 */
		asm ("eor\t%0, %1, %1, ror #16" : "=r" (t) : "r" (x));
	} else
#endif
		t = x ^ ((x << 16) | (x >> 16)); /* eor r1,r0,r0,ror #16 */

	x = (x << 24) | (x >> 8);		/* mov r0,r0,ror #8      */
	t &= ~0x00FF0000;			/* bic r1,r1,#0x00FF0000 */
	x ^= (t >> 8);				/* eor r0,r0,r1,lsr #8   */

	return x;
}
#define __arch_swab32 __arch_swab32

#endif

#endif /* _UAPI__ASM_ARM_SWAB_H */

Filemanager

Name Type Size Permission Actions
Kbuild File 563 B 0644
auxvec.h File 165 B 0644
byteorder.h File 711 B 0644
fcntl.h File 355 B 0644
hwcap.h File 1.19 KB 0644
ioctls.h File 183 B 0644
kvm.h File 9.33 KB 0644
kvm_para.h File 97 B 0644
mman.h File 145 B 0644
perf_regs.h File 494 B 0644
posix_types.h File 1.04 KB 0644
ptrace.h File 4.16 KB 0644
setup.h File 3.94 KB 0644
sigcontext.h File 831 B 0644
signal.h File 2.8 KB 0644
stat.h File 1.93 KB 0644
statfs.h File 423 B 0644
swab.h File 1.43 KB 0644
types.h File 1.44 KB 0644
unistd.h File 1.22 KB 0644