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- /* SPDX-License-Identifier: GPL-2.0 */
- /* U3patch.S: Patch Ultra-I routines with Ultra-III variant.
- *
- * Copyright (C) 2004 David S. Miller <davem@redhat.com>
- */
- #define BRANCH_ALWAYS 0x10680000
- #define NOP 0x01000000
- #define ULTRA3_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 cheetah_patch_copyops
- .type cheetah_patch_copyops,#function
- cheetah_patch_copyops:
- ULTRA3_DO_PATCH(memcpy, U3memcpy)
- ULTRA3_DO_PATCH(raw_copy_from_user, U3copy_from_user)
- ULTRA3_DO_PATCH(raw_copy_to_user, U3copy_to_user)
- retl
- nop
- .size cheetah_patch_copyops,.-cheetah_patch_copyops
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