Release 4.14 arch/mips/include/asm/prefetch.h

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2003 by Ralf Baechle
 */
#ifndef __ASM_PREFETCH_H

#define __ASM_PREFETCH_H


/*
 * R5000 and RM5200 implements pref and prefx instructions but they're nops, so
 * rather than wasting time we pretend these processors don't support
 * prefetching at all.
 *
 * R5432 implements Load, Store, LoadStreamed, StoreStreamed, LoadRetained,
 * StoreRetained and WriteBackInvalidate but not Pref_PrepareForStore.
 *
 * Hell (and the book on my shelf I can't open ...) know what the R8000 does.
 *
 * RM7000 version 1.0 interprets all hints as Pref_Load; version 2.0 implements
 * Pref_PrepareForStore also.
 *
 * RM9000 is MIPS IV but implements prefetching like MIPS32/MIPS64; it's
 * Pref_WriteBackInvalidate is a nop and Pref_PrepareForStore is broken in
 * current versions due to erratum G105.
 *
 * VR5500 (including VR5701 and VR7701) only implement load prefetch.
 *
 * Finally MIPS32 and MIPS64 implement all of the following hints.
 */


#define Pref_Load			0

#define Pref_Store			1
						/* 2 and 3 are reserved */

#define Pref_LoadStreamed		4

#define Pref_StoreStreamed		5

#define Pref_LoadRetained		6

#define Pref_StoreRetained		7
						/* 8 ... 24 are reserved */

#define Pref_WriteBackInvalidate	25

#define Pref_PrepareForStore		30

#ifdef __ASSEMBLY__

	.macro	__pref hint addr
#ifdef CONFIG_CPU_HAS_PREFETCH
	pref	\hint, \addr
#endif
	.endm

	.macro	pref_load addr
	__pref	Pref_Load, \addr
	.endm

	.macro	pref_store addr
	__pref	Pref_Store, \addr
	.endm

	.macro	pref_load_streamed addr
	__pref	Pref_LoadStreamed, \addr
	.endm

	.macro	pref_store_streamed addr
	__pref	Pref_StoreStreamed, \addr
	.endm

	.macro	pref_load_retained addr
	__pref	Pref_LoadRetained, \addr
	.endm

	.macro	pref_store_retained addr
	__pref	Pref_StoreRetained, \addr
	.endm

	.macro	pref_wback_inv addr
	__pref	Pref_WriteBackInvalidate, \addr
	.endm

	.macro	pref_prepare_for_store addr
	__pref	Pref_PrepareForStore, \addr
	.endm

#endif

#endif /* __ASM_PREFETCH_H */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Ralf Bächle
111
71.15%
1
33.33%
Andrew Morton
44
28.21%
1
33.33%
Shinya Kuribayashi
1
0.64%
1
33.33%
Total
156
100.00%
3
100.00%
Directory: arch/mips/include/asm

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