xref: /openbmc/linux/arch/sparc/lib/NGpatch.S (revision b2441318)
1/* SPDX-License-Identifier: GPL-2.0 */
2/* NGpatch.S: Patch Ultra-I routines with Niagara variant.
3 *
4 * Copyright (C) 2006 David S. Miller <davem@davemloft.net>
5 */
6
7#define BRANCH_ALWAYS	0x10680000
8#define NOP		0x01000000
9#define NG_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	niagara_patch_copyops
27	.type	niagara_patch_copyops,#function
28niagara_patch_copyops:
29	NG_DO_PATCH(memcpy, NGmemcpy)
30	NG_DO_PATCH(raw_copy_from_user, NGcopy_from_user)
31	NG_DO_PATCH(raw_copy_to_user, NGcopy_to_user)
32	retl
33	 nop
34	.size	niagara_patch_copyops,.-niagara_patch_copyops
35