1/* SPDX-License-Identifier: GPL-2.0 */ 2/* U3patch.S: Patch Ultra-I routines with Ultra-III variant. 3 * 4 * Copyright (C) 2004 David S. Miller <davem@redhat.com> 5 */ 6 7#define BRANCH_ALWAYS 0x10680000 8#define NOP 0x01000000 9#define ULTRA3_DO_PATCH(OLD, NEW) \ 10 sethi %hi(NEW), %g1; \ 11 or %g1, %lo(NEW), %g1; \ 12 sethi %hi(OLD), %g2; \ 13 or %g2, %lo(OLD), %g2; \ 14 sub %g1, %g2, %g1; \ 15 sethi %hi(BRANCH_ALWAYS), %g3; \ 16 sll %g1, 11, %g1; \ 17 srl %g1, 11 + 2, %g1; \ 18 or %g3, %lo(BRANCH_ALWAYS), %g3; \ 19 or %g3, %g1, %g3; \ 20 stw %g3, [%g2]; \ 21 sethi %hi(NOP), %g3; \ 22 or %g3, %lo(NOP), %g3; \ 23 stw %g3, [%g2 + 0x4]; \ 24 flush %g2; 25 26 .globl cheetah_patch_copyops 27 .type cheetah_patch_copyops,#function 28cheetah_patch_copyops: 29 ULTRA3_DO_PATCH(memcpy, U3memcpy) 30 ULTRA3_DO_PATCH(raw_copy_from_user, U3copy_from_user) 31 ULTRA3_DO_PATCH(raw_copy_to_user, U3copy_to_user) 32 retl 33 nop 34 .size cheetah_patch_copyops,.-cheetah_patch_copyops 35