/* SPDX-License-Identifier: GPL-2.0 */
/* NG4patch.S: Patch Ultra-I routines with Niagara-4 variant.
 *
 * Copyright (C) 2012 David S. Miller <davem@davemloft.net>
 */

#include <linux/linkage.h>

#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  niagara4_patch_copyops
        .type   niagara4_patch_copyops,#function
niagara4_patch_copyops:
        NG_DO_PATCH(memcpy, NG4memcpy)
        NG_DO_PATCH(raw_copy_from_user, NG4copy_from_user)
        NG_DO_PATCH(raw_copy_to_user, NG4copy_to_user)
        retl
         nop
        .size   niagara4_patch_copyops,.-niagara4_patch_copyops

        .globl  niagara4_patch_bzero
        .type   niagara4_patch_bzero,#function
niagara4_patch_bzero:
        NG_DO_PATCH(memset, NG4memset)
        NG_DO_PATCH(__bzero, NG4bzero)
        NG_DO_PATCH(__clear_user, NGclear_user)
        NG_DO_PATCH(tsb_init, NGtsb_init)
        retl
         nop
        .size   niagara4_patch_bzero,.-niagara4_patch_bzero

        .globl  niagara4_patch_pageops
        .type   niagara4_patch_pageops,#function
niagara4_patch_pageops:
        NG_DO_PATCH(copy_user_page, NG4copy_user_page)
        NG_DO_PATCH(_clear_page, NG4clear_page)
        NG_DO_PATCH(clear_user_page, NG4clear_user_page)
        retl
         nop
        .size   niagara4_patch_pageops,.-niagara4_patch_pageops

ENTRY(niagara4_patch_fls)
        NG_DO_PATCH(fls, NG4fls)
        NG_DO_PATCH(__fls, __NG4fls)
        retl
         nop
ENDPROC(niagara4_patch_fls)