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54 lines
1.4 KiB
54 lines
1.4 KiB
/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
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/* |
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* arch/arm/include/asm/byteorder.h |
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* |
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* ARM Endian-ness. In little endian mode, the data bus is connected such |
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* that byte accesses appear as: |
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* 0 = d0...d7, 1 = d8...d15, 2 = d16...d23, 3 = d24...d31 |
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* and word accesses (data or instruction) appear as: |
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* d0...d31 |
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* |
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* When in big endian mode, byte accesses appear as: |
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* 0 = d24...d31, 1 = d16...d23, 2 = d8...d15, 3 = d0...d7 |
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* and word accesses (data or instruction) appear as: |
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* d0...d31 |
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*/ |
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#ifndef _UAPI__ASM_ARM_SWAB_H |
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#define _UAPI__ASM_ARM_SWAB_H |
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#include <linux/compiler.h> |
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#include <linux/types.h> |
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#if !defined(__STRICT_ANSI__) || defined(__KERNEL__) |
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# define __SWAB_64_THRU_32__ |
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#endif |
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#if !defined(__KERNEL__) || __LINUX_ARM_ARCH__ < 6 |
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static inline __attribute_const__ __u32 __arch_swab32(__u32 x) |
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{ |
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__u32 t; |
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#ifndef __thumb__ |
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if (!__builtin_constant_p(x)) { |
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/* |
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* The compiler needs a bit of a hint here to always do the |
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* right thing and not screw it up to different degrees |
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* depending on the gcc version. |
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*/ |
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asm ("eor\t%0, %1, %1, ror #16" : "=r" (t) : "r" (x)); |
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} else |
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#endif |
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t = x ^ ((x << 16) | (x >> 16)); /* eor r1,r0,r0,ror #16 */ |
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x = (x << 24) | (x >> 8); /* mov r0,r0,ror #8 */ |
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t &= ~0x00FF0000; /* bic r1,r1,#0x00FF0000 */ |
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x ^= (t >> 8); /* eor r0,r0,r1,lsr #8 */ |
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return x; |
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} |
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#define __arch_swab32 __arch_swab32 |
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#endif |
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#endif /* _UAPI__ASM_ARM_SWAB_H */
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