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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-parisc/byteorder.h | |
download | op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.zip op-kernel-dev-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.gz |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'include/asm-parisc/byteorder.h')
-rw-r--r-- | include/asm-parisc/byteorder.h | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/include/asm-parisc/byteorder.h b/include/asm-parisc/byteorder.h new file mode 100644 index 0000000..db14831 --- /dev/null +++ b/include/asm-parisc/byteorder.h @@ -0,0 +1,82 @@ +#ifndef _PARISC_BYTEORDER_H +#define _PARISC_BYTEORDER_H + +#include <asm/types.h> +#include <linux/compiler.h> + +#ifdef __GNUC__ + +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; +} + +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; +} + + +#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(x) ___arch__swab64(x) +#define __BYTEORDER_HAS_U64__ +#elif !defined(__STRICT_ANSI__) +static __inline__ __attribute_const__ __u64 ___arch__swab64(__u64 x) +{ + __u32 t1 = ___arch__swab32((__u32) x); + __u32 t2 = ___arch__swab32((__u32) (x >> 32)); + return (((__u64) t1 << 32) | t2); +} +#define __arch__swab64(x) ___arch__swab64(x) +#define __BYTEORDER_HAS_U64__ +#endif + +#define __arch__swab16(x) ___arch__swab16(x) +#define __arch__swab24(x) ___arch__swab24(x) +#define __arch__swab32(x) ___arch__swab32(x) + +#endif /* __GNUC__ */ + +#include <linux/byteorder/big_endian.h> + +#endif /* _PARISC_BYTEORDER_H */ |