mirror of https://gitee.com/openkylin/linux.git
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
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#ifndef _PARISC_BYTEORDER_H
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#define _PARISC_BYTEORDER_H
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#include <asm/types.h>
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#include <linux/compiler.h>
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#ifdef __GNUC__
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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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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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#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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__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(x) ___arch__swab64(x)
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#define __BYTEORDER_HAS_U64__
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#elif !defined(__STRICT_ANSI__)
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static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 x)
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{
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__u32 t1 = ___arch__swab32((__u32) x);
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__u32 t2 = ___arch__swab32((__u32) (x >> 32));
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return (((__u64) t1 << 32) | t2);
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}
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#define __arch__swab64(x) ___arch__swab64(x)
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#define __BYTEORDER_HAS_U64__
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#endif
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#define __arch__swab16(x) ___arch__swab16(x)
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#define __arch__swab24(x) ___arch__swab24(x)
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#define __arch__swab32(x) ___arch__swab32(x)
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#endif /* __GNUC__ */
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#include <linux/byteorder/big_endian.h>
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#endif /* _PARISC_BYTEORDER_H */
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