root/arch/sparc/lib/GENpage.S

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* GENpage.S: Generic clear and copy page.
   3  *
   4  * Copyright (C) 2007 (davem@davemloft.net)
   5  */
   6 #include <asm/page.h>
   7 
   8         .text
   9         .align  32
  10 
  11 GENcopy_user_page:
  12         set     PAGE_SIZE, %g7
  13 1:      ldx     [%o1 + 0x00], %o2
  14         ldx     [%o1 + 0x08], %o3
  15         ldx     [%o1 + 0x10], %o4
  16         ldx     [%o1 + 0x18], %o5
  17         stx     %o2, [%o0 + 0x00]
  18         stx     %o3, [%o0 + 0x08]
  19         stx     %o4, [%o0 + 0x10]
  20         stx     %o5, [%o0 + 0x18]
  21         ldx     [%o1 + 0x20], %o2
  22         ldx     [%o1 + 0x28], %o3
  23         ldx     [%o1 + 0x30], %o4
  24         ldx     [%o1 + 0x38], %o5
  25         stx     %o2, [%o0 + 0x20]
  26         stx     %o3, [%o0 + 0x28]
  27         stx     %o4, [%o0 + 0x30]
  28         stx     %o5, [%o0 + 0x38]
  29         subcc   %g7, 64, %g7
  30         add     %o1, 64, %o1
  31         bne,pt  %xcc, 1b
  32          add    %o0, 64, %o0
  33         retl
  34          nop
  35 
  36 GENclear_page:
  37 GENclear_user_page:
  38         set     PAGE_SIZE, %g7
  39 1:      stx     %g0, [%o0 + 0x00]
  40         stx     %g0, [%o0 + 0x08]
  41         stx     %g0, [%o0 + 0x10]
  42         stx     %g0, [%o0 + 0x18]
  43         stx     %g0, [%o0 + 0x20]
  44         stx     %g0, [%o0 + 0x28]
  45         stx     %g0, [%o0 + 0x30]
  46         stx     %g0, [%o0 + 0x38]
  47         subcc   %g7, 64, %g7
  48         bne,pt  %xcc, 1b
  49          add    %o0, 64, %o0
  50 
  51 #define BRANCH_ALWAYS   0x10680000
  52 #define NOP             0x01000000
  53 #define GEN_DO_PATCH(OLD, NEW)  \
  54         sethi   %hi(NEW), %g1; \
  55         or      %g1, %lo(NEW), %g1; \
  56         sethi   %hi(OLD), %g2; \
  57         or      %g2, %lo(OLD), %g2; \
  58         sub     %g1, %g2, %g1; \
  59         sethi   %hi(BRANCH_ALWAYS), %g3; \
  60         sll     %g1, 11, %g1; \
  61         srl     %g1, 11 + 2, %g1; \
  62         or      %g3, %lo(BRANCH_ALWAYS), %g3; \
  63         or      %g3, %g1, %g3; \
  64         stw     %g3, [%g2]; \
  65         sethi   %hi(NOP), %g3; \
  66         or      %g3, %lo(NOP), %g3; \
  67         stw     %g3, [%g2 + 0x4]; \
  68         flush   %g2;
  69 
  70         .globl  generic_patch_pageops
  71         .type   generic_patch_pageops,#function
  72 generic_patch_pageops:
  73         GEN_DO_PATCH(copy_user_page, GENcopy_user_page)
  74         GEN_DO_PATCH(_clear_page, GENclear_page)
  75         GEN_DO_PATCH(clear_user_page, GENclear_user_page)
  76         retl
  77          nop
  78         .size   generic_patch_pageops,.-generic_patch_pageops