| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | /* NGpatch.S: Patch Ultra-I routines with Niagara variant. |
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| 3 | * |
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| 4 | * Copyright (C) 2006 David S. Miller <davem@davemloft.net> |
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| 5 | */ |
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| 6 | |
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| 7 | #define BRANCH_ALWAYS 0x10680000 |
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| 8 | #define NOP 0x01000000 |
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| 9 | #define NG_DO_PATCH(OLD, NEW) \ |
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| 10 | sethi %hi(NEW), %g1; \ |
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| 11 | or %g1, %lo(NEW), %g1; \ |
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| 12 | sethi %hi(OLD), %g2; \ |
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| 13 | or %g2, %lo(OLD), %g2; \ |
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| 14 | sub %g1, %g2, %g1; \ |
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| 15 | sethi %hi(BRANCH_ALWAYS), %g3; \ |
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| 16 | sll %g1, 11, %g1; \ |
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| 17 | srl %g1, 11 + 2, %g1; \ |
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| 18 | or %g3, %lo(BRANCH_ALWAYS), %g3; \ |
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| 19 | or %g3, %g1, %g3; \ |
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| 20 | stw %g3, [%g2]; \ |
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| 21 | sethi %hi(NOP), %g3; \ |
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| 22 | or %g3, %lo(NOP), %g3; \ |
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| 23 | stw %g3, [%g2 + 0x4]; \ |
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| 24 | flush %g2; |
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| 25 | |
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| 26 | .globl niagara_patch_copyops |
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| 27 | .type niagara_patch_copyops,#function |
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| 28 | niagara_patch_copyops: |
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| 29 | NG_DO_PATCH(memcpy, NGmemcpy) |
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| 30 | NG_DO_PATCH(raw_copy_from_user, NGcopy_from_user) |
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| 31 | NG_DO_PATCH(raw_copy_to_user, NGcopy_to_user) |
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| 32 | retl |
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| 33 | nop |
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| 34 | .size niagara_patch_copyops,.-niagara_patch_copyops |
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| 35 | |
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