/*
 * M7patch.S: Patch generic routines with M7 variant.
 *
 * Copyright (c) 2016, Oracle and/or its affiliates.  All rights reserved.
 */

#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;

ENTRY(m7_patch_copyops)
        NG_DO_PATCH(memcpy, M7memcpy)
        NG_DO_PATCH(raw_copy_from_user, M7copy_from_user)
        NG_DO_PATCH(raw_copy_to_user, M7copy_to_user)
        retl
         nop
ENDPROC(m7_patch_copyops)

ENTRY(m7_patch_bzero)
        NG_DO_PATCH(memset, M7memset)
        NG_DO_PATCH(__bzero, M7bzero)
        NG_DO_PATCH(__clear_user, NGclear_user)
        NG_DO_PATCH(tsb_init, NGtsb_init)
        retl
         nop
ENDPROC(m7_patch_bzero)

ENTRY(m7_patch_pageops)
        NG_DO_PATCH(copy_user_page, NG4copy_user_page)
        NG_DO_PATCH(_clear_page, M7clear_page)
        NG_DO_PATCH(clear_user_page, M7clear_user_page)
        retl
         nop
ENDPROC(m7_patch_pageops)