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ae2c6ca6 DM |
1 | /* NG4copy_to_user.S: Niagara-4 optimized copy to userspace. |
2 | * | |
3 | * Copyright (C) 2012 David S. Miller (davem@davemloft.net) | |
4 | */ | |
5 | ||
6 | #define EX_ST(x) \ | |
7 | 98: x; \ | |
8 | .section __ex_table,"a";\ | |
9 | .align 4; \ | |
10 | .word 98b, __retl_one_asi;\ | |
11 | .text; \ | |
12 | .align 4; | |
13 | ||
14 | #ifndef ASI_AIUS | |
15 | #define ASI_AIUS 0x11 | |
16 | #endif | |
17 | ||
18 | #ifndef ASI_BLK_INIT_QUAD_LDD_AIUS | |
19 | #define ASI_BLK_INIT_QUAD_LDD_AIUS 0x23 | |
20 | #endif | |
21 | ||
22 | #define FUNC_NAME NG4copy_to_user | |
23 | #define STORE(type,src,addr) type##a src, [addr] %asi | |
24 | #define STORE_ASI ASI_BLK_INIT_QUAD_LDD_AIUS | |
25 | #define EX_RETVAL(x) 0 | |
26 | ||
27 | #ifdef __KERNEL__ | |
28 | /* Writing to %asi is _expensive_ so we hardcode it. | |
29 | * Reading %asi to check for KERNEL_DS is comparatively | |
30 | * cheap. | |
31 | */ | |
32 | #define PREAMBLE \ | |
33 | rd %asi, %g1; \ | |
34 | cmp %g1, ASI_AIUS; \ | |
35 | bne,pn %icc, ___copy_in_user; \ | |
36 | nop | |
37 | #endif | |
38 | ||
39 | #include "NG4memcpy.S" |