mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-21 16:29:59 +00:00
![Harvey Harrison](/assets/img/avatar_default.png)
Fix for the linux/byteorder.h removal. Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
#ifndef _PARISC_SWAB_H
|
|
#define _PARISC_SWAB_H
|
|
|
|
#include <asm/types.h>
|
|
#include <linux/compiler.h>
|
|
|
|
#define __SWAB_64_THRU_32__
|
|
|
|
static inline __attribute_const__ __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 __attribute_const__ __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 __attribute_const__ __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 __attribute_const__ __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 */
|