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e245b80c HH |
1 | #ifndef _PARISC_SWAB_H |
2 | #define _PARISC_SWAB_H | |
3 | ||
726da1e3 | 4 | #include <linux/types.h> |
e245b80c HH |
5 | #include <linux/compiler.h> |
6 | ||
7 | #define __SWAB_64_THRU_32__ | |
8 | ||
9 | static inline __attribute_const__ __u16 __arch_swab16(__u16 x) | |
10 | { | |
11 | __asm__("dep %0, 15, 8, %0\n\t" /* deposit 00ab -> 0bab */ | |
12 | "shd %%r0, %0, 8, %0" /* shift 000000ab -> 00ba */ | |
13 | : "=r" (x) | |
14 | : "0" (x)); | |
15 | return x; | |
16 | } | |
17 | #define __arch_swab16 __arch_swab16 | |
18 | ||
19 | static inline __attribute_const__ __u32 __arch_swab24(__u32 x) | |
20 | { | |
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 */ | |
24 | : "=r" (x) | |
25 | : "0" (x)); | |
26 | return x; | |
27 | } | |
28 | ||
29 | static inline __attribute_const__ __u32 __arch_swab32(__u32 x) | |
30 | { | |
31 | unsigned int temp; | |
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) | |
36 | : "0" (x)); | |
37 | return x; | |
38 | } | |
39 | #define __arch_swab32 __arch_swab32 | |
40 | ||
41 | #if BITS_PER_LONG > 32 | |
42 | /* | |
43 | ** From "PA-RISC 2.0 Architecture", HP Professional Books. | |
44 | ** See Appendix I page 8 , "Endian Byte Swapping". | |
45 | ** | |
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!) | |
51 | */ | |
52 | static inline __attribute_const__ __u64 __arch_swab64(__u64 x) | |
53 | { | |
54 | __u64 temp; | |
55 | __asm__("permh,3210 %0, %0\n\t" | |
56 | "hshl %0, 8, %1\n\t" | |
57 | "hshr,u %0, 8, %0\n\t" | |
58 | "or %1, %0, %0" | |
59 | : "=r" (x), "=&r" (temp) | |
60 | : "0" (x)); | |
61 | return x; | |
62 | } | |
63 | #define __arch_swab64 __arch_swab64 | |
64 | #endif /* BITS_PER_LONG > 32 */ | |
65 | ||
66 | #endif /* _PARISC_SWAB_H */ |