mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-16 08:44:21 +08:00
6f52b16c5b
Many user space API headers are missing licensing information, which makes it hard for compliance tools to determine the correct license. By default are files without license information under the default license of the kernel, which is GPLV2. Marking them GPLV2 would exclude them from being included in non GPLV2 code, which is obviously not intended. The user space API headers fall under the syscall exception which is in the kernels COPYING file: NOTE! This copyright does *not* cover user programs that use kernel services by normal system calls - this is merely considered normal use of the kernel, and does *not* fall under the heading of "derived work". otherwise syscall usage would not be possible. Update the files which contain no license information with an SPDX license identifier. The chosen identifier is 'GPL-2.0 WITH Linux-syscall-note' which is the officially assigned identifier for the Linux syscall exception. SPDX license identifiers are a legally binding shorthand, which can be used instead of the full boiler plate text. This patch is based on work done by Thomas Gleixner and Kate Stewart and Philippe Ombredanne. See the previous patch in this series for the methodology of how this patch was researched. Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com> Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
55 lines
1.4 KiB
C
55 lines
1.4 KiB
C
/* 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 */
|