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1da177e4 LT |
1 | /* U3patch.S: Patch Ultra-I routines with Ultra-III variant. |
2 | * | |
3 | * Copyright (C) 2004 David S. Miller <davem@redhat.com> | |
4 | */ | |
5 | ||
6 | #define BRANCH_ALWAYS 0x10680000 | |
7 | #define NOP 0x01000000 | |
8 | #define ULTRA3_DO_PATCH(OLD, NEW) \ | |
9 | sethi %hi(NEW), %g1; \ | |
10 | or %g1, %lo(NEW), %g1; \ | |
11 | sethi %hi(OLD), %g2; \ | |
12 | or %g2, %lo(OLD), %g2; \ | |
13 | sub %g1, %g2, %g1; \ | |
14 | sethi %hi(BRANCH_ALWAYS), %g3; \ | |
15 | srl %g1, 2, %g1; \ | |
16 | or %g3, %lo(BRANCH_ALWAYS), %g3; \ | |
17 | or %g3, %g1, %g3; \ | |
18 | stw %g3, [%g2]; \ | |
19 | sethi %hi(NOP), %g3; \ | |
20 | or %g3, %lo(NOP), %g3; \ | |
21 | stw %g3, [%g2 + 0x4]; \ | |
22 | flush %g2; | |
23 | ||
24 | .globl cheetah_patch_copyops | |
25 | .type cheetah_patch_copyops,#function | |
26 | cheetah_patch_copyops: | |
27 | ULTRA3_DO_PATCH(memcpy, U3memcpy) | |
28 | ULTRA3_DO_PATCH(___copy_from_user, U3copy_from_user) | |
29 | ULTRA3_DO_PATCH(___copy_to_user, U3copy_to_user) | |
30 | retl | |
31 | nop | |
32 | .size cheetah_patch_copyops,.-cheetah_patch_copyops |