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cf5adce1 DM |
1 | /* NG2copy_to_user.S: Niagara-2 optimized copy to userspace. |
2 | * | |
3 | * Copyright (C) 2007 David S. Miller (davem@davemloft.net) | |
4 | */ | |
5 | ||
6 | #define EX_ST(x) \ | |
7 | 98: x; \ | |
8 | .section .fixup; \ | |
9 | .align 4; \ | |
10 | 99: wr %g0, ASI_AIUS, %asi;\ | |
11 | retl; \ | |
12 | mov 1, %o0; \ | |
13 | .section __ex_table,"a";\ | |
14 | .align 4; \ | |
15 | .word 98b, 99b; \ | |
16 | .text; \ | |
17 | .align 4; | |
18 | ||
19 | #ifndef ASI_AIUS | |
20 | #define ASI_AIUS 0x11 | |
21 | #endif | |
22 | ||
23 | #ifndef ASI_BLK_AIUS_4V | |
24 | #define ASI_BLK_AIUS_4V 0x17 | |
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 NG2copy_to_user | |
32 | #define STORE(type,src,addr) type##a src, [addr] ASI_AIUS | |
33 | #define STORE_ASI ASI_BLK_INIT_QUAD_LDD_AIUS | |
34 | #define STORE_BLK(src,addr) stda src, [addr] ASI_BLK_AIUS_4V | |
35 | #define EX_RETVAL(x) 0 | |
36 | ||
37 | #ifdef __KERNEL__ | |
38 | /* Writing to %asi is _expensive_ so we hardcode it. | |
39 | * Reading %asi to check for KERNEL_DS is comparatively | |
40 | * cheap. | |
41 | */ | |
42 | #define PREAMBLE \ | |
43 | rd %asi, %g1; \ | |
44 | cmp %g1, ASI_AIUS; \ | |
45 | bne,pn %icc, memcpy_user_stub; \ | |
46 | nop | |
47 | #endif | |
48 | ||
49 | #include "NG2memcpy.S" |