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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sparc/lib/M7copy_to_user.S
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/*

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 * M7copy_to_user.S: SPARC M7 optimized copy to userspace.

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 *

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 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.

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 */

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#define EX_ST(x, y)			\

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98:	x;				\

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	.section __ex_table,"a";	\

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	.align 4;			\

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	.word 98b, y;			\

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	.text;				\

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	.align 4;

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#define EX_ST_FP(x, y)			\

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98:	x;				\

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	.section __ex_table,"a";	\

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	.align 4;			\

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	.word 98b, y##_fp;		\

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	.text;				\

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	.align 4;

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#ifndef ASI_AIUS

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#define ASI_AIUS	0x11

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#endif

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#ifndef ASI_BLK_INIT_QUAD_LDD_AIUS

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#define ASI_BLK_INIT_QUAD_LDD_AIUS 0x23

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#endif

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#define FUNC_NAME		M7copy_to_user

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#define STORE(type,src,addr)	type##a src, [addr] %asi

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#define STORE_ASI		ASI_BLK_INIT_QUAD_LDD_AIUS

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#define	STORE_MRU_ASI		ASI_ST_BLKINIT_MRU_S

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#define EX_RETVAL(x)		0

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#ifdef __KERNEL__

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	/* Writing to %asi is _expensive_ so we hardcode it.

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	 * Reading %asi to check for KERNEL_DS is comparatively

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	 * cheap.

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	 */

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#define PREAMBLE					\

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	rd		%asi, %g1;			\

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	cmp		%g1, ASI_AIUS;			\

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	bne,pn		%icc, raw_copy_in_user;		\

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	 nop

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#endif

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#include "M7memcpy.S"

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