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8591e302 DM |
1 | /* NGpage.S: Niagara optimize clear and copy page. |
2 | * | |
3 | * Copyright (C) 2006 (davem@davemloft.net) | |
4 | */ | |
5 | ||
6 | #include <asm/asi.h> | |
7 | #include <asm/page.h> | |
8 | ||
9 | .text | |
10 | .align 32 | |
11 | ||
12 | /* This is heavily simplified from the sun4u variants | |
13 | * because Niagara does not have any D-cache aliasing issues | |
14 | * and also we don't need to use the FPU in order to implement | |
15 | * an optimal page copy/clear. | |
16 | */ | |
17 | ||
18 | NGcopy_user_page: /* %o0=dest, %o1=src, %o2=vaddr */ | |
19 | prefetch [%o1 + 0x00], #one_read | |
20 | mov 8, %g1 | |
21 | mov 16, %g2 | |
22 | mov 24, %g3 | |
23 | set PAGE_SIZE, %g7 | |
24 | ||
25 | 1: ldda [%o1 + %g0] ASI_BLK_INIT_QUAD_LDD_P, %o2 | |
26 | ldda [%o1 + %g2] ASI_BLK_INIT_QUAD_LDD_P, %o4 | |
27 | prefetch [%o1 + 0x40], #one_read | |
28 | add %o1, 32, %o1 | |
29 | stxa %o2, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P | |
30 | stxa %o3, [%o0 + %g1] ASI_BLK_INIT_QUAD_LDD_P | |
31 | ldda [%o1 + %g0] ASI_BLK_INIT_QUAD_LDD_P, %o2 | |
32 | stxa %o4, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P | |
33 | stxa %o5, [%o0 + %g3] ASI_BLK_INIT_QUAD_LDD_P | |
34 | ldda [%o1 + %g2] ASI_BLK_INIT_QUAD_LDD_P, %o4 | |
35 | add %o1, 32, %o1 | |
36 | add %o0, 32, %o0 | |
37 | stxa %o2, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P | |
38 | stxa %o3, [%o0 + %g1] ASI_BLK_INIT_QUAD_LDD_P | |
39 | stxa %o4, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P | |
40 | stxa %o5, [%o0 + %g3] ASI_BLK_INIT_QUAD_LDD_P | |
41 | subcc %g7, 64, %g7 | |
42 | bne,pt %xcc, 1b | |
43 | add %o0, 32, %o0 | |
44 | retl | |
45 | nop | |
46 | ||
47 | NGclear_page: /* %o0=dest */ | |
48 | NGclear_user_page: /* %o0=dest, %o1=vaddr */ | |
49 | mov 8, %g1 | |
50 | mov 16, %g2 | |
51 | mov 24, %g3 | |
52 | set PAGE_SIZE, %g7 | |
53 | ||
54 | 1: stxa %g0, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P | |
55 | stxa %g0, [%o0 + %g1] ASI_BLK_INIT_QUAD_LDD_P | |
56 | stxa %g0, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P | |
57 | stxa %g0, [%o0 + %g3] ASI_BLK_INIT_QUAD_LDD_P | |
58 | add %o0, 32, %o0 | |
59 | stxa %g0, [%o0 + %g0] ASI_BLK_INIT_QUAD_LDD_P | |
60 | stxa %g0, [%o0 + %g1] ASI_BLK_INIT_QUAD_LDD_P | |
61 | stxa %g0, [%o0 + %g2] ASI_BLK_INIT_QUAD_LDD_P | |
62 | stxa %g0, [%o0 + %g3] ASI_BLK_INIT_QUAD_LDD_P | |
63 | subcc %g7, 64, %g7 | |
64 | bne,pt %xcc, 1b | |
65 | add %o0, 32, %o0 | |
66 | retl | |
67 | nop | |
68 | ||
69 | #define BRANCH_ALWAYS 0x10680000 | |
70 | #define NOP 0x01000000 | |
71 | #define NG_DO_PATCH(OLD, NEW) \ | |
72 | sethi %hi(NEW), %g1; \ | |
73 | or %g1, %lo(NEW), %g1; \ | |
74 | sethi %hi(OLD), %g2; \ | |
75 | or %g2, %lo(OLD), %g2; \ | |
76 | sub %g1, %g2, %g1; \ | |
77 | sethi %hi(BRANCH_ALWAYS), %g3; \ | |
6241e5cc DM |
78 | sll %g1, 11, %g1; \ |
79 | srl %g1, 11 + 2, %g1; \ | |
8591e302 DM |
80 | or %g3, %lo(BRANCH_ALWAYS), %g3; \ |
81 | or %g3, %g1, %g3; \ | |
82 | stw %g3, [%g2]; \ | |
83 | sethi %hi(NOP), %g3; \ | |
84 | or %g3, %lo(NOP), %g3; \ | |
85 | stw %g3, [%g2 + 0x4]; \ | |
86 | flush %g2; | |
87 | ||
88 | .globl niagara_patch_pageops | |
89 | .type niagara_patch_pageops,#function | |
90 | niagara_patch_pageops: | |
91 | NG_DO_PATCH(copy_user_page, NGcopy_user_page) | |
92 | NG_DO_PATCH(_clear_page, NGclear_page) | |
93 | NG_DO_PATCH(clear_user_page, NGclear_user_page) | |
94 | retl | |
95 | nop | |
96 | .size niagara_patch_pageops,.-niagara_patch_pageops |