android_kernel_xiaomi_sm8350/arch/sparc64/lib/NG2copy_to_user.S
David S. Miller cf5adce117 [SPARC64]: Niagara-2 optimized copies.
The bzero/memset implementation stays the same as Niagara-1.

Signed-off-by: David S. Miller <davem@davemloft.net>
2007-08-16 01:47:25 -07:00

50 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) \
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"