4
#include <linux/types.h>
5
#include <linux/compiler.h>
7
#define __SWAB_64_THRU_32__
9
static inline __attribute_const__ __u16 __arch_swab16(__u16 x)
11
__asm__("dep %0, 15, 8, %0\n\t" /* deposit 00ab -> 0bab */
12
"shd %%r0, %0, 8, %0" /* shift 000000ab -> 00ba */
17
#define __arch_swab16 __arch_swab16
19
static inline __attribute_const__ __u32 __arch_swab24(__u32 x)
21
__asm__("shd %0, %0, 8, %0\n\t" /* shift xabcxabc -> cxab */
22
"dep %0, 15, 8, %0\n\t" /* deposit cxab -> cbab */
23
"shd %%r0, %0, 8, %0" /* shift 0000cbab -> 0cba */
29
static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
32
__asm__("shd %0, %0, 16, %1\n\t" /* shift abcdabcd -> cdab */
33
"dep %1, 15, 8, %1\n\t" /* deposit cdab -> cbab */
34
"shd %0, %1, 8, %0" /* shift abcdcbab -> dcba */
35
: "=r" (x), "=&r" (temp)
39
#define __arch_swab32 __arch_swab32
41
#if BITS_PER_LONG > 32
43
** From "PA-RISC 2.0 Architecture", HP Professional Books.
44
** See Appendix I page 8 , "Endian Byte Swapping".
46
** Pretty cool algorithm: (* == zero'd bits)
47
** PERMH 01234567 -> 67452301 into %0
48
** HSHL 67452301 -> 7*5*3*1* into %1
49
** HSHR 67452301 -> *6*4*2*0 into %0
50
** OR %0 | %1 -> 76543210 into %0 (all done!)
52
static inline __attribute_const__ __u64 __arch_swab64(__u64 x)
55
__asm__("permh,3210 %0, %0\n\t"
57
"hshr,u %0, 8, %0\n\t"
59
: "=r" (x), "=&r" (temp)
63
#define __arch_swab64 __arch_swab64
64
#endif /* BITS_PER_LONG > 32 */
66
#endif /* _PARISC_SWAB_H */