blob: c5c9abb3cb773aacb912e09d8f8bffb5a6fd40e1 [file] [log] [blame]
Greg Kroah-Hartmanb2441312017-11-01 15:07:57 +01001/* SPDX-License-Identifier: GPL-2.0 */
David S. Millerae2c6ca2012-09-26 21:11:01 -07002/* NG4copy_to_user.S: Niagara-4 optimized copy to userspace.
3 *
4 * Copyright (C) 2012 David S. Miller (davem@davemloft.net)
5 */
6
David S. Miller957077042016-10-24 18:58:05 -07007#define EX_ST(x,y) \
David S. Millerae2c6ca2012-09-26 21:11:01 -0700898: x; \
9 .section __ex_table,"a";\
10 .align 4; \
David S. Miller957077042016-10-24 18:58:05 -070011 .word 98b, y; \
David S. Millerae2c6ca2012-09-26 21:11:01 -070012 .text; \
13 .align 4;
14
David S. Miller957077042016-10-24 18:58:05 -070015#define EX_ST_FP(x,y) \
Rob Gardnera7c57242015-12-22 23:24:49 -07001698: x; \
17 .section __ex_table,"a";\
18 .align 4; \
David S. Miller957077042016-10-24 18:58:05 -070019 .word 98b, y##_fp; \
Rob Gardnera7c57242015-12-22 23:24:49 -070020 .text; \
21 .align 4;
22
David S. Millerae2c6ca2012-09-26 21:11:01 -070023#ifndef ASI_AIUS
24#define ASI_AIUS 0x11
25#endif
26
27#ifndef ASI_BLK_INIT_QUAD_LDD_AIUS
28#define ASI_BLK_INIT_QUAD_LDD_AIUS 0x23
29#endif
30
31#define FUNC_NAME NG4copy_to_user
32#define STORE(type,src,addr) type##a src, [addr] %asi
33#define STORE_ASI ASI_BLK_INIT_QUAD_LDD_AIUS
34#define EX_RETVAL(x) 0
35
36#ifdef __KERNEL__
37 /* Writing to %asi is _expensive_ so we hardcode it.
38 * Reading %asi to check for KERNEL_DS is comparatively
39 * cheap.
40 */
41#define PREAMBLE \
42 rd %asi, %g1; \
43 cmp %g1, ASI_AIUS; \
Al Viro31af2f32017-03-21 17:04:45 -040044 bne,pn %icc, raw_copy_in_user; \
David S. Millerae2c6ca2012-09-26 21:11:01 -070045 nop
46#endif
47
48#include "NG4memcpy.S"