LXR linux/arch/sparc/lib/NGpage.S

   1/* NGpage.S: Niagara optimize clear and copy page.
   2 *
   3 * Copyright (C) 2006 (davem@davemloft.net)
   4 */
   5
   6#include <asm/asi.h>
   7#include <asm/page.h>
   8
   9        .text
  10        .align  32
  11
  12        /* This is heavily simplified from the sun4u variants
  13         * because Niagara does not have any D-cache aliasing issues
  14         * and also we don't need to use the FPU in order to implement
  15         * an optimal page copy/clear.
  16         */
  17
  18NGcopy_user_page:       /* %o0=dest, %o1=src, %o2=vaddr */
  19        save            %sp, -192, %sp
  20        rd              %asi, %g3
  21        wr              %g0, ASI_BLK_INIT_QUAD_LDD_P, %asi
  22        set             PAGE_SIZE, %g7
  23        prefetch        [%i1 + 0x00], #one_read
  24        prefetch        [%i1 + 0x40], #one_read
  25
  261:      prefetch        [%i1 + 0x80], #one_read
  27        prefetch        [%i1 + 0xc0], #one_read
  28        ldda            [%i1 + 0x00] %asi, %o2
  29        ldda            [%i1 + 0x10] %asi, %o4
  30        ldda            [%i1 + 0x20] %asi, %l2
  31        ldda            [%i1 + 0x30] %asi, %l4
  32        stxa            %o2, [%i0 + 0x00] %asi
  33        stxa            %o3, [%i0 + 0x08] %asi
  34        stxa            %o4, [%i0 + 0x10] %asi
  35        stxa            %o5, [%i0 + 0x18] %asi
  36        stxa            %l2, [%i0 + 0x20] %asi
  37        stxa            %l3, [%i0 + 0x28] %asi
  38        stxa            %l4, [%i0 + 0x30] %asi
  39        stxa            %l5, [%i0 + 0x38] %asi
  40        ldda            [%i1 + 0x40] %asi, %o2
  41        ldda            [%i1 + 0x50] %asi, %o4
  42        ldda            [%i1 + 0x60] %asi, %l2
  43        ldda            [%i1 + 0x70] %asi, %l4
  44        stxa            %o2, [%i0 + 0x40] %asi
  45        stxa            %o3, [%i0 + 0x48] %asi
  46        stxa            %o4, [%i0 + 0x50] %asi
  47        stxa            %o5, [%i0 + 0x58] %asi
  48        stxa            %l2, [%i0 + 0x60] %asi
  49        stxa            %l3, [%i0 + 0x68] %asi
  50        stxa            %l4, [%i0 + 0x70] %asi
  51        stxa            %l5, [%i0 + 0x78] %asi
  52        add             %i1, 128, %i1
  53        subcc           %g7, 128, %g7
  54        bne,pt          %xcc, 1b
  55         add            %i0, 128, %i0
  56        wr              %g3, 0x0, %asi
  57        membar          #Sync
  58        ret
  59         restore
  60
  61        .align          32
  62        .globl          NGclear_page
  63        .globl          NGclear_user_page
  64NGclear_page:           /* %o0=dest */
  65NGclear_user_page:      /* %o0=dest, %o1=vaddr */
  66        rd              %asi, %g3
  67        wr              %g0, ASI_BLK_INIT_QUAD_LDD_P, %asi
  68        set             PAGE_SIZE, %g7
  69
  701:      stxa            %g0, [%o0 + 0x00] %asi
  71        stxa            %g0, [%o0 + 0x08] %asi
  72        stxa            %g0, [%o0 + 0x10] %asi
  73        stxa            %g0, [%o0 + 0x18] %asi
  74        stxa            %g0, [%o0 + 0x20] %asi
  75        stxa            %g0, [%o0 + 0x28] %asi
  76        stxa            %g0, [%o0 + 0x30] %asi
  77        stxa            %g0, [%o0 + 0x38] %asi
  78        stxa            %g0, [%o0 + 0x40] %asi
  79        stxa            %g0, [%o0 + 0x48] %asi
  80        stxa            %g0, [%o0 + 0x50] %asi
  81        stxa            %g0, [%o0 + 0x58] %asi
  82        stxa            %g0, [%o0 + 0x60] %asi
  83        stxa            %g0, [%o0 + 0x68] %asi
  84        stxa            %g0, [%o0 + 0x70] %asi
  85        stxa            %g0, [%o0 + 0x78] %asi
  86        stxa            %g0, [%o0 + 0x80] %asi
  87        stxa            %g0, [%o0 + 0x88] %asi
  88        stxa            %g0, [%o0 + 0x90] %asi
  89        stxa            %g0, [%o0 + 0x98] %asi
  90        stxa            %g0, [%o0 + 0xa0] %asi
  91        stxa            %g0, [%o0 + 0xa8] %asi
  92        stxa            %g0, [%o0 + 0xb0] %asi
  93        stxa            %g0, [%o0 + 0xb8] %asi
  94        stxa            %g0, [%o0 + 0xc0] %asi
  95        stxa            %g0, [%o0 + 0xc8] %asi
  96        stxa            %g0, [%o0 + 0xd0] %asi
  97        stxa            %g0, [%o0 + 0xd8] %asi
  98        stxa            %g0, [%o0 + 0xe0] %asi
  99        stxa            %g0, [%o0 + 0xe8] %asi
 100        stxa            %g0, [%o0 + 0xf0] %asi
 101        stxa            %g0, [%o0 + 0xf8] %asi
 102        subcc           %g7, 256, %g7
 103        bne,pt          %xcc, 1b
 104         add            %o0, 256, %o0
 105        wr              %g3, 0x0, %asi
 106        membar          #Sync
 107        retl
 108         nop
 109
 110#define BRANCH_ALWAYS   0x10680000
 111#define NOP             0x01000000
 112#define NG_DO_PATCH(OLD, NEW)   \
 113        sethi   %hi(NEW), %g1; \
 114        or      %g1, %lo(NEW), %g1; \
 115        sethi   %hi(OLD), %g2; \
 116        or      %g2, %lo(OLD), %g2; \
 117        sub     %g1, %g2, %g1; \
 118        sethi   %hi(BRANCH_ALWAYS), %g3; \
 119        sll     %g1, 11, %g1; \
 120        srl     %g1, 11 + 2, %g1; \
 121        or      %g3, %lo(BRANCH_ALWAYS), %g3; \
 122        or      %g3, %g1, %g3; \
 123        stw     %g3, [%g2]; \
 124        sethi   %hi(NOP), %g3; \
 125        or      %g3, %lo(NOP), %g3; \
 126        stw     %g3, [%g2 + 0x4]; \
 127        flush   %g2;
 128
 129        .globl  niagara_patch_pageops
 130        .type   niagara_patch_pageops,#function
 131niagara_patch_pageops:
 132        NG_DO_PATCH(copy_user_page, NGcopy_user_page)
 133        NG_DO_PATCH(_clear_page, NGclear_page)
 134        NG_DO_PATCH(clear_user_page, NGclear_user_page)
 135        retl
 136         nop
 137        .size   niagara_patch_pageops,.-niagara_patch_pageops
 138