35 lines
918 B
ArmAsm
Executable file
35 lines
918 B
ArmAsm
Executable file
/* SPDX-License-Identifier: GPL-2.0 */
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/* NG2patch.S: Patch Ultra-I routines with Niagara-2 variant.
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*
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* Copyright (C) 2007 David S. Miller <davem@davemloft.net>
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*/
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#define BRANCH_ALWAYS 0x10680000
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#define NOP 0x01000000
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#define NG_DO_PATCH(OLD, NEW) \
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sethi %hi(NEW), %g1; \
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or %g1, %lo(NEW), %g1; \
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sethi %hi(OLD), %g2; \
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or %g2, %lo(OLD), %g2; \
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sub %g1, %g2, %g1; \
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sethi %hi(BRANCH_ALWAYS), %g3; \
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sll %g1, 11, %g1; \
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srl %g1, 11 + 2, %g1; \
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or %g3, %lo(BRANCH_ALWAYS), %g3; \
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or %g3, %g1, %g3; \
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stw %g3, [%g2]; \
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sethi %hi(NOP), %g3; \
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or %g3, %lo(NOP), %g3; \
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stw %g3, [%g2 + 0x4]; \
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flush %g2;
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.globl niagara2_patch_copyops
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.type niagara2_patch_copyops,#function
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niagara2_patch_copyops:
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NG_DO_PATCH(memcpy, NG2memcpy)
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NG_DO_PATCH(raw_copy_from_user, NG2copy_from_user)
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NG_DO_PATCH(raw_copy_to_user, NG2copy_to_user)
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retl
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nop
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.size niagara2_patch_copyops,.-niagara2_patch_copyops
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