| Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 |