| /* SPDX-License-Identifier: GPL-2.0 */ | |
| /* U3patch.S: Patch Ultra-I routines with Ultra-III variant. | |
| * | |
| * Copyright (C) 2004 David S. Miller <davem@redhat.com> | |
| */ | |
| #define BRANCH_ALWAYS 0x10680000 | |
| #define NOP 0x01000000 | |
| #define ULTRA3_DO_PATCH(OLD, NEW) \ | |
| sethi %hi(NEW), %g1; \ | |
| or %g1, %lo(NEW), %g1; \ | |
| sethi %hi(OLD), %g2; \ | |
| or %g2, %lo(OLD), %g2; \ | |
| sub %g1, %g2, %g1; \ | |
| sethi %hi(BRANCH_ALWAYS), %g3; \ | |
| sll %g1, 11, %g1; \ | |
| srl %g1, 11 + 2, %g1; \ | |
| or %g3, %lo(BRANCH_ALWAYS), %g3; \ | |
| or %g3, %g1, %g3; \ | |
| stw %g3, [%g2]; \ | |
| sethi %hi(NOP), %g3; \ | |
| or %g3, %lo(NOP), %g3; \ | |
| stw %g3, [%g2 + 0x4]; \ | |
| flush %g2; | |
| .globl cheetah_patch_copyops | |
| .type cheetah_patch_copyops,#function | |
| cheetah_patch_copyops: | |
| ULTRA3_DO_PATCH(memcpy, U3memcpy) | |
| ULTRA3_DO_PATCH(raw_copy_from_user, U3copy_from_user) | |
| ULTRA3_DO_PATCH(raw_copy_to_user, U3copy_to_user) | |
| retl | |
| nop | |
| .size cheetah_patch_copyops,.-cheetah_patch_copyops |