35 lines
907 B
ArmAsm
Executable File
35 lines
907 B
ArmAsm
Executable File
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/* NGpatch.S: Patch Ultra-I routines with Niagara variant.
|
|
*
|
|
* Copyright (C) 2006 David S. Miller <davem@davemloft.net>
|
|
*/
|
|
|
|
#define BRANCH_ALWAYS 0x10680000
|
|
#define NOP 0x01000000
|
|
#define NG_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 niagara_patch_copyops
|
|
.type niagara_patch_copyops,#function
|
|
niagara_patch_copyops:
|
|
NG_DO_PATCH(memcpy, NGmemcpy)
|
|
NG_DO_PATCH(raw_copy_from_user, NGcopy_from_user)
|
|
NG_DO_PATCH(raw_copy_to_user, NGcopy_to_user)
|
|
retl
|
|
nop
|
|
.size niagara_patch_copyops,.-niagara_patch_copyops
|