67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
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#ifndef _PARISC_SWAB_H
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#define _PARISC_SWAB_H
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#include <linux/types.h>
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#include <linux/compiler.h>
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#define __SWAB_64_THRU_32__
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static inline __attribute_const__ __u16 __arch_swab16(__u16 x)
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{
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__asm__("dep %0, 15, 8, %0\n\t" /* deposit 00ab -> 0bab */
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"shd %%r0, %0, 8, %0" /* shift 000000ab -> 00ba */
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: "=r" (x)
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: "0" (x));
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return x;
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}
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#define __arch_swab16 __arch_swab16
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static inline __attribute_const__ __u32 __arch_swab24(__u32 x)
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{
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__asm__("shd %0, %0, 8, %0\n\t" /* shift xabcxabc -> cxab */
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"dep %0, 15, 8, %0\n\t" /* deposit cxab -> cbab */
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"shd %%r0, %0, 8, %0" /* shift 0000cbab -> 0cba */
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: "=r" (x)
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: "0" (x));
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return x;
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}
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static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
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{
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unsigned int temp;
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__asm__("shd %0, %0, 16, %1\n\t" /* shift abcdabcd -> cdab */
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"dep %1, 15, 8, %1\n\t" /* deposit cdab -> cbab */
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"shd %0, %1, 8, %0" /* shift abcdcbab -> dcba */
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: "=r" (x), "=&r" (temp)
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: "0" (x));
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return x;
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}
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#define __arch_swab32 __arch_swab32
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#if BITS_PER_LONG > 32
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/*
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** From "PA-RISC 2.0 Architecture", HP Professional Books.
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** See Appendix I page 8 , "Endian Byte Swapping".
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**
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** Pretty cool algorithm: (* == zero'd bits)
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** PERMH 01234567 -> 67452301 into %0
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** HSHL 67452301 -> 7*5*3*1* into %1
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** HSHR 67452301 -> *6*4*2*0 into %0
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** OR %0 | %1 -> 76543210 into %0 (all done!)
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*/
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static inline __attribute_const__ __u64 __arch_swab64(__u64 x)
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{
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__u64 temp;
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__asm__("permh,3210 %0, %0\n\t"
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"hshl %0, 8, %1\n\t"
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"hshr,u %0, 8, %0\n\t"
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"or %1, %0, %0"
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: "=r" (x), "=&r" (temp)
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: "0" (x));
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return x;
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}
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#define __arch_swab64 __arch_swab64
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#endif /* BITS_PER_LONG > 32 */
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#endif /* _PARISC_SWAB_H */
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