xref: /OK3568_Linux_fs/kernel/arch/arm/include/uapi/asm/byteorder.h (revision 4882a59341e53eb6f0b4789bf948001014eff981)
1*4882a593Smuzhiyun /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun  *  arch/arm/include/asm/byteorder.h
4*4882a593Smuzhiyun  *
5*4882a593Smuzhiyun  * ARM Endian-ness.  In little endian mode, the data bus is connected such
6*4882a593Smuzhiyun  * that byte accesses appear as:
7*4882a593Smuzhiyun  *  0 = d0...d7, 1 = d8...d15, 2 = d16...d23, 3 = d24...d31
8*4882a593Smuzhiyun  * and word accesses (data or instruction) appear as:
9*4882a593Smuzhiyun  *  d0...d31
10*4882a593Smuzhiyun  *
11*4882a593Smuzhiyun  * When in big endian mode, byte accesses appear as:
12*4882a593Smuzhiyun  *  0 = d24...d31, 1 = d16...d23, 2 = d8...d15, 3 = d0...d7
13*4882a593Smuzhiyun  * and word accesses (data or instruction) appear as:
14*4882a593Smuzhiyun  *  d0...d31
15*4882a593Smuzhiyun  */
16*4882a593Smuzhiyun #ifndef __ASM_ARM_BYTEORDER_H
17*4882a593Smuzhiyun #define __ASM_ARM_BYTEORDER_H
18*4882a593Smuzhiyun 
19*4882a593Smuzhiyun #ifdef __ARMEB__
20*4882a593Smuzhiyun #include <linux/byteorder/big_endian.h>
21*4882a593Smuzhiyun #else
22*4882a593Smuzhiyun #include <linux/byteorder/little_endian.h>
23*4882a593Smuzhiyun #endif
24*4882a593Smuzhiyun 
25*4882a593Smuzhiyun #endif
26*4882a593Smuzhiyun 
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