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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/sparc/lib/NG2copy_to_user.S
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/* SPDX-License-Identifier: GPL-2.0 */

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/* NG2copy_to_user.S: Niagara-2 optimized copy to userspace.

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 *

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 * Copyright (C) 2007 David S. Miller ([email protected])

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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_AIUS_4V

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#define ASI_BLK_AIUS_4V	0x17

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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		NG2copy_to_user

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

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#define STORE_ASI		ASI_BLK_INIT_QUAD_LDD_AIUS

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#define STORE_BLK(src,addr)	stda src, [addr] ASI_BLK_AIUS_4V

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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 "NG2memcpy.S"

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