LXR linux/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
  11GENcopy_user_page:
  12        set     PAGE_SIZE, %g7
  131:      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
  36GENclear_page:
  37GENclear_user_page:
  38        set     PAGE_SIZE, %g7
  391:      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
  72generic_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
  79