/* 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