linux_dsm_epyc7002/arch/sparc/lib/NG2copy_to_user.S
Al Viro 31af2f36d5 sparc: switch to RAW_COPY_USER
... and drop zeroing in sparc32.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2017-04-02 12:53:15 -04:00

53 lines
1.0 KiB
ArmAsm

/* NG2copy_to_user.S: Niagara-2 optimized copy to userspace.
*
* Copyright (C) 2007 David S. Miller (davem@davemloft.net)
*/
#define EX_ST(x,y) \
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, y; \
.text; \
.align 4;
#define EX_ST_FP(x,y) \
98: x; \
.section __ex_table,"a";\
.align 4; \
.word 98b, y##_fp; \
.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, raw_copy_in_user; \
nop
#endif
#include "NG2memcpy.S"