[linux-2.6-block.git] / arch / parisc / include / asm / byteorder.h

#ifndef _PARISC_BYTEORDER_H
#define _PARISC_BYTEORDER_H

#include <asm/types.h>
#include <linux/compiler.h>

#define __BIG_ENDIAN
#define __SWAB_64_THRU_32__

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;
}
#define __arch_swab16 __arch_swab16

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;
}
#define __arch_swab32 __arch_swab32

#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 __arch_swab64
#endif /* BITS_PER_LONG > 32 */

#include <linux/byteorder.h>

#endif /* _PARISC_BYTEORDER_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _PARISC_BYTEORDER_H
	2	#define _PARISC_BYTEORDER_H
	3
	4	#include <asm/types.h>
	5	#include <linux/compiler.h>
	6
d2e6675f HH	7	#define __BIG_ENDIAN
d2e6675f HH	8	#define __SWAB_64_THRU_32__
1da177e4	9
d2e6675f	10	static inline __attribute_const__ __u16 __arch_swab16(__u16 x)
1da177e4 LT	11	{
	12	__asm__("dep %0, 15, 8, %0\n\t" /* deposit 00ab -> 0bab */
	13	"shd %%r0, %0, 8, %0" /* shift 000000ab -> 00ba */
	14	: "=r" (x)
	15	: "0" (x));
	16	return x;
	17	}
d2e6675f	18	#define __arch_swab16 __arch_swab16
1da177e4	19
d2e6675f	20	static inline __attribute_const__ __u32 __arch_swab24(__u32 x)
1da177e4 LT	21	{
	22	__asm__("shd %0, %0, 8, %0\n\t" /* shift xabcxabc -> cxab */
	23	"dep %0, 15, 8, %0\n\t" /* deposit cxab -> cbab */
	24	"shd %%r0, %0, 8, %0" /* shift 0000cbab -> 0cba */
	25	: "=r" (x)
	26	: "0" (x));
	27	return x;
	28	}
	29
d2e6675f	30	static inline __attribute_const__ __u32 __arch_swab32(__u32 x)
1da177e4 LT	31	{
	32	unsigned int temp;
	33	__asm__("shd %0, %0, 16, %1\n\t" /* shift abcdabcd -> cdab */
	34	"dep %1, 15, 8, %1\n\t" /* deposit cdab -> cbab */
	35	"shd %0, %1, 8, %0" /* shift abcdcbab -> dcba */
	36	: "=r" (x), "=&r" (temp)
	37	: "0" (x));
	38	return x;
	39	}
d2e6675f	40	#define __arch_swab32 __arch_swab32
1da177e4 LT	41
	42	#if BITS_PER_LONG > 32
	43	/*
	44	** From "PA-RISC 2.0 Architecture", HP Professional Books.
	45	** See Appendix I page 8 , "Endian Byte Swapping".
	46	**
	47	** Pretty cool algorithm: (* == zero'd bits)
	48	** PERMH 01234567 -> 67452301 into %0
	49	** HSHL 67452301 -> 7531 into %1
	50	** HSHR 67452301 -> 6420 into %0
	51	** OR %0 \| %1 -> 76543210 into %0 (all done!)
	52	*/
d2e6675f HH	53	static inline __attribute_const__ __u64 __arch_swab64(__u64 x)
d2e6675f HH	54	{
1da177e4 LT	55	__u64 temp;
	56	__asm__("permh,3210 %0, %0\n\t"
	57	"hshl %0, 8, %1\n\t"
	58	"hshr,u %0, 8, %0\n\t"
	59	"or %1, %0, %0"
	60	: "=r" (x), "=&r" (temp)
	61	: "0" (x));
	62	return x;
	63	}
d2e6675f HH	64	#define __arch_swab64 __arch_swab64
d2e6675f HH	65	#endif /* BITS_PER_LONG > 32 */
1da177e4	66
d2e6675f	67	#include <linux/byteorder.h>
1da177e4 LT	68
1da177e4 LT	69	#endif /* _PARISC_BYTEORDER_H */