ng2copy_to_user.s
来自「linux 内核源代码」· S 代码 · 共 50 行
S
50 行
/* 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"
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