/usr/hppa-linux-gnu/include/asm/swab.h is in linux-libc-dev-hppa-cross 4.15.0-18.19cross1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
#ifndef _PARISC_SWAB_H
#define _PARISC_SWAB_H
#include <asm/bitsperlong.h>
#include <linux/types.h>
#define __SWAB_64_THRU_32__
static __inline__ __u16 __arch_swab16(__u16 x)
{
__asm__("dep %0, 15, 8, %0\n\t" /* deposit 00ab -> 0bab */
"shd %%r0, %0, 8, %0" /* shift 000000ab -> 00ba */
: "=r" (x)
: "0" (x));
return x;
}
#define __arch_swab16 __arch_swab16
static __inline__ __u32 __arch_swab24(__u32 x)
{
__asm__("shd %0, %0, 8, %0\n\t" /* shift xabcxabc -> cxab */
"dep %0, 15, 8, %0\n\t" /* deposit cxab -> cbab */
"shd %%r0, %0, 8, %0" /* shift 0000cbab -> 0cba */
: "=r" (x)
: "0" (x));
return x;
}
static __inline__ __u32 __arch_swab32(__u32 x)
{
unsigned int temp;
__asm__("shd %0, %0, 16, %1\n\t" /* shift abcdabcd -> cdab */
"dep %1, 15, 8, %1\n\t" /* deposit cdab -> cbab */
"shd %0, %1, 8, %0" /* shift abcdcbab -> dcba */
: "=r" (x), "=&r" (temp)
: "0" (x));
return x;
}
#define __arch_swab32 __arch_swab32
#if __BITS_PER_LONG > 32
/*
** From "PA-RISC 2.0 Architecture", HP Professional Books.
** See Appendix I page 8 , "Endian Byte Swapping".
**
** Pretty cool algorithm: (* == zero'd bits)
** PERMH 01234567 -> 67452301 into %0
** HSHL 67452301 -> 7*5*3*1* into %1
** HSHR 67452301 -> *6*4*2*0 into %0
** OR %0 | %1 -> 76543210 into %0 (all done!)
*/
static __inline__ __u64 __arch_swab64(__u64 x)
{
__u64 temp;
__asm__("permh,3210 %0, %0\n\t"
"hshl %0, 8, %1\n\t"
"hshr,u %0, 8, %0\n\t"
"or %1, %0, %0"
: "=r" (x), "=&r" (temp)
: "0" (x));
return x;
}
#define __arch_swab64 __arch_swab64
#endif /* __BITS_PER_LONG > 32 */
#endif /* _PARISC_SWAB_H */
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