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6c70b6fc DM |
1 | /* GENpage.S: Generic clear and copy page. |
2 | * | |
3 | * Copyright (C) 2007 (davem@davemloft.net) | |
4 | */ | |
5 | #include <asm/page.h> | |
6 | ||
7 | .text | |
8 | .align 32 | |
9 | ||
10 | GENcopy_user_page: | |
11 | set PAGE_SIZE, %g7 | |
12 | 1: ldx [%o1 + 0x00], %o2 | |
13 | ldx [%o1 + 0x08], %o3 | |
14 | ldx [%o1 + 0x10], %o4 | |
15 | ldx [%o1 + 0x18], %o5 | |
16 | stx %o2, [%o0 + 0x00] | |
17 | stx %o3, [%o0 + 0x08] | |
18 | stx %o4, [%o0 + 0x10] | |
19 | stx %o5, [%o0 + 0x18] | |
20 | ldx [%o1 + 0x20], %o2 | |
21 | ldx [%o1 + 0x28], %o3 | |
22 | ldx [%o1 + 0x30], %o4 | |
23 | ldx [%o1 + 0x38], %o5 | |
24 | stx %o2, [%o0 + 0x20] | |
25 | stx %o3, [%o0 + 0x28] | |
26 | stx %o4, [%o0 + 0x30] | |
27 | stx %o5, [%o0 + 0x38] | |
28 | subcc %g7, 64, %g7 | |
29 | add %o1, 64, %o1 | |
30 | bne,pt %xcc, 1b | |
31 | add %o0, 64, %o0 | |
32 | retl | |
33 | nop | |
34 | ||
35 | GENclear_page: | |
36 | GENclear_user_page: | |
37 | set PAGE_SIZE, %g7 | |
38 | 1: stx %g0, [%o0 + 0x00] | |
39 | stx %g0, [%o0 + 0x08] | |
40 | stx %g0, [%o0 + 0x10] | |
41 | stx %g0, [%o0 + 0x18] | |
42 | stx %g0, [%o0 + 0x20] | |
43 | stx %g0, [%o0 + 0x28] | |
44 | stx %g0, [%o0 + 0x30] | |
45 | stx %g0, [%o0 + 0x38] | |
46 | subcc %g7, 64, %g7 | |
47 | bne,pt %xcc, 1b | |
48 | add %o0, 64, %o0 | |
49 | ||
50 | #define BRANCH_ALWAYS 0x10680000 | |
51 | #define NOP 0x01000000 | |
52 | #define GEN_DO_PATCH(OLD, NEW) \ | |
53 | sethi %hi(NEW), %g1; \ | |
54 | or %g1, %lo(NEW), %g1; \ | |
55 | sethi %hi(OLD), %g2; \ | |
56 | or %g2, %lo(OLD), %g2; \ | |
57 | sub %g1, %g2, %g1; \ | |
58 | sethi %hi(BRANCH_ALWAYS), %g3; \ | |
59 | sll %g1, 11, %g1; \ | |
60 | srl %g1, 11 + 2, %g1; \ | |
61 | or %g3, %lo(BRANCH_ALWAYS), %g3; \ | |
62 | or %g3, %g1, %g3; \ | |
63 | stw %g3, [%g2]; \ | |
64 | sethi %hi(NOP), %g3; \ | |
65 | or %g3, %lo(NOP), %g3; \ | |
66 | stw %g3, [%g2 + 0x4]; \ | |
67 | flush %g2; | |
68 | ||
69 | .globl generic_patch_pageops | |
70 | .type generic_patch_pageops,#function | |
71 | generic_patch_pageops: | |
72 | GEN_DO_PATCH(copy_user_page, GENcopy_user_page) | |
73 | GEN_DO_PATCH(_clear_page, GENclear_page) | |
74 | GEN_DO_PATCH(clear_user_page, GENclear_user_page) | |
75 | retl | |
76 | nop | |
77 | .size generic_patch_pageops,.-generic_patch_pageops |