arch/sparc/lib/NG4patch.S

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* NG4patch.S: Patch Ultra-I routines with Niagara-4 variant.
   3  *
   4  * Copyright (C) 2012 David S. Miller <davem@davemloft.net>
   5  */
   6
   7 #define BRANCH_ALWAYS   0x10680000
   8 #define NOP             0x01000000
   9 #define NG_DO_PATCH(OLD, NEW)   \
  10         sethi   %hi(NEW), %g1; \
  11         or      %g1, %lo(NEW), %g1; \
  12         sethi   %hi(OLD), %g2; \
  13         or      %g2, %lo(OLD), %g2; \
  14         sub     %g1, %g2, %g1; \
  15         sethi   %hi(BRANCH_ALWAYS), %g3; \
  16         sll     %g1, 11, %g1; \
  17         srl     %g1, 11 + 2, %g1; \
  18         or      %g3, %lo(BRANCH_ALWAYS), %g3; \
  19         or      %g3, %g1, %g3; \
  20         stw     %g3, [%g2]; \
  21         sethi   %hi(NOP), %g3; \
  22         or      %g3, %lo(NOP), %g3; \
  23         stw     %g3, [%g2 + 0x4]; \
  24         flush   %g2;
  25
  26         .globl  niagara4_patch_copyops
  27         .type   niagara4_patch_copyops,#function
  28 niagara4_patch_copyops:
  29         NG_DO_PATCH(memcpy, NG4memcpy)
  30         NG_DO_PATCH(raw_copy_from_user, NG4copy_from_user)
  31         NG_DO_PATCH(raw_copy_to_user, NG4copy_to_user)
  32         retl
  33          nop
  34         .size   niagara4_patch_copyops,.-niagara4_patch_copyops
  35
  36         .globl  niagara4_patch_bzero
  37         .type   niagara4_patch_bzero,#function
  38 niagara4_patch_bzero:
  39         NG_DO_PATCH(memset, NG4memset)
  40         NG_DO_PATCH(__bzero, NG4bzero)
  41         NG_DO_PATCH(__clear_user, NGclear_user)
  42         NG_DO_PATCH(tsb_init, NGtsb_init)
  43         retl
  44          nop
  45         .size   niagara4_patch_bzero,.-niagara4_patch_bzero
  46
  47         .globl  niagara4_patch_pageops
  48         .type   niagara4_patch_pageops,#function
  49 niagara4_patch_pageops:
  50         NG_DO_PATCH(copy_user_page, NG4copy_user_page)
  51         NG_DO_PATCH(_clear_page, NG4clear_page)
  52         NG_DO_PATCH(clear_user_page, NG4clear_user_page)
  53         retl
  54          nop
  55         .size   niagara4_patch_pageops,.-niagara4_patch_pageops