/arch/sparc/lib/NGpatch.S
Assembly | 33 lines | 31 code | 2 blank | 0 comment | 0 complexity | aceedb7675f36addfda6a80fcb1b7e52 MD5 | raw file
Possible License(s): LGPL-2.0, AGPL-1.0, GPL-2.0
1/* NGpatch.S: Patch Ultra-I routines with Niagara variant.
2 *
3 * Copyright (C) 2006 David S. Miller <davem@davemloft.net>
4 */
5
6#define BRANCH_ALWAYS 0x10680000
7#define NOP 0x01000000
8#define NG_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 sll %g1, 11, %g1; \
16 srl %g1, 11 + 2, %g1; \
17 or %g3, %lo(BRANCH_ALWAYS), %g3; \
18 or %g3, %g1, %g3; \
19 stw %g3, [%g2]; \
20 sethi %hi(NOP), %g3; \
21 or %g3, %lo(NOP), %g3; \
22 stw %g3, [%g2 + 0x4]; \
23 flush %g2;
24
25 .globl niagara_patch_copyops
26 .type niagara_patch_copyops,#function
27niagara_patch_copyops:
28 NG_DO_PATCH(memcpy, NGmemcpy)
29 NG_DO_PATCH(___copy_from_user, NGcopy_from_user)
30 NG_DO_PATCH(___copy_to_user, NGcopy_to_user)
31 retl
32 nop
33 .size niagara_patch_copyops,.-niagara_patch_copyops