1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* U3patch.S: Patch Ultra-I routines with Ultr
3 *
4 * Copyright (C) 2004 David S. Miller <davem@re
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,#functio
28 cheetah_patch_copyops:
29 ULTRA3_DO_PATCH(memcpy, U3memcpy)
30 ULTRA3_DO_PATCH(raw_copy_from_user, U3
31 ULTRA3_DO_PATCH(raw_copy_to_user, U3co
32 retl
33 nop
34 .size cheetah_patch_copyops,.-cheeta
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