ng2copy_to_user.s

来自「linux 内核源代码」· S 代码 · 共 50 行

S
50
字号
/* NG2copy_to_user.S: Niagara-2 optimized copy to userspace. * * Copyright (C) 2007 David S. Miller (davem@davemloft.net) */#define EX_ST(x)		\98:	x;			\	.section .fixup;	\	.align 4;		\99:	wr	%g0, ASI_AIUS, %asi;\	retl;			\	 mov	1, %o0;		\	.section __ex_table,"a";\	.align 4;		\	.word 98b, 99b;		\	.text;			\	.align 4;#ifndef ASI_AIUS#define ASI_AIUS	0x11#endif#ifndef ASI_BLK_AIUS_4V#define ASI_BLK_AIUS_4V	0x17#endif#ifndef ASI_BLK_INIT_QUAD_LDD_AIUS#define ASI_BLK_INIT_QUAD_LDD_AIUS 0x23#endif#define FUNC_NAME		NG2copy_to_user#define STORE(type,src,addr)	type##a src, [addr] ASI_AIUS#define STORE_ASI		ASI_BLK_INIT_QUAD_LDD_AIUS#define STORE_BLK(src,addr)	stda src, [addr] ASI_BLK_AIUS_4V#define EX_RETVAL(x)		0#ifdef __KERNEL__	/* Writing to %asi is _expensive_ so we hardcode it.	 * Reading %asi to check for KERNEL_DS is comparatively	 * cheap.	 */#define PREAMBLE					\	rd		%asi, %g1;			\	cmp		%g1, ASI_AIUS;			\	bne,pn		%icc, memcpy_user_stub;		\	 nop#endif#include "NG2memcpy.S"

⌨️ 快捷键说明

复制代码Ctrl + C
搜索代码Ctrl + F
全屏模式F11
增大字号Ctrl + =
减小字号Ctrl + -
显示快捷键?