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Commit e245b80c authored by Harvey Harrison's avatar Harvey Harrison Committed by Linus Torvalds
Browse files

parisc: introduce asm/swab.h 



Fix for the linux/byteorder.h removal.

Signed-off-by: default avatarHarvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 8659c406

arch/parisc/include/asm/Kbuild

+1 −0
Original line number Diff line number Diff line 
include include/asm-generic/Kbuild.asm



unifdef-y += pdc.h

unifdef-y += swab.h

arch/parisc/include/asm/byteorder.h

+2 −64
Original line number Diff line number Diff line 
#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>

#include <asm/swab.h>

#include <linux/byteorder/big_endian.h>



#endif /* _PARISC_BYTEORDER_H */

arch/parisc/include/asm/swab.h

0 → 100644
+66 −0
Original line number Diff line number Diff line 
#ifndef _PARISC_SWAB_H

#define _PARISC_SWAB_H



#include <asm/types.h>

#include <linux/compiler.h>



#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 */



#endif /* _PARISC_SWAB_H */