arch/powerpc/lib/copypage_64.S

   1 /*
   2  * Copyright (C) 2008 Mark Nelson, IBM Corp.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  */
   9 #include <asm/page.h>
  10 #include <asm/processor.h>
  11 #include <asm/ppc_asm.h>
  12 #include <asm/asm-offsets.h>
  13 #include <asm/export.h>
  14
  15         .section        ".toc","aw"
  16 PPC64_CACHES:
  17         .tc             ppc64_caches[TC],ppc64_caches
  18         .section        ".text"
  19
  20 _GLOBAL_TOC(copy_page)
  21 BEGIN_FTR_SECTION
  22         lis     r5,PAGE_SIZE@h
  23 FTR_SECTION_ELSE
  24         b       copypage_power7
  25 ALT_FTR_SECTION_END_IFCLR(CPU_FTR_VMX_COPY)
  26         ori     r5,r5,PAGE_SIZE@l
  27 BEGIN_FTR_SECTION
  28         ld      r10,PPC64_CACHES@toc(r2)
  29         lwz     r11,DCACHEL1LOGLINESIZE(r10)    /* log2 of cache line size */
  30         lwz     r12,DCACHEL1LINESIZE(r10)       /* get cache line size */
  31         li      r9,0
  32         srd     r8,r5,r11
  33
  34         mtctr   r8
  35 .Lsetup:
  36         dcbt    r9,r4
  37         dcbz    r9,r3
  38         add     r9,r9,r12
  39         bdnz    .Lsetup
  40 END_FTR_SECTION_IFSET(CPU_FTR_CP_USE_DCBTZ)
  41         addi    r3,r3,-8
  42         srdi    r8,r5,7         /* page is copied in 128 byte strides */
  43         addi    r8,r8,-1        /* one stride copied outside loop */
  44
  45         mtctr   r8
  46
  47         ld      r5,0(r4)
  48         ld      r6,8(r4)
  49         ld      r7,16(r4)
  50         ldu     r8,24(r4)
  51 1:      std     r5,8(r3)
  52         std     r6,16(r3)
  53         ld      r9,8(r4)
  54         ld      r10,16(r4)
  55         std     r7,24(r3)
  56         std     r8,32(r3)
  57         ld      r11,24(r4)
  58         ld      r12,32(r4)
  59         std     r9,40(r3)
  60         std     r10,48(r3)
  61         ld      r5,40(r4)
  62         ld      r6,48(r4)
  63         std     r11,56(r3)
  64         std     r12,64(r3)
  65         ld      r7,56(r4)
  66         ld      r8,64(r4)
  67         std     r5,72(r3)
  68         std     r6,80(r3)
  69         ld      r9,72(r4)
  70         ld      r10,80(r4)
  71         std     r7,88(r3)
  72         std     r8,96(r3)
  73         ld      r11,88(r4)
  74         ld      r12,96(r4)
  75         std     r9,104(r3)
  76         std     r10,112(r3)
  77         ld      r5,104(r4)
  78         ld      r6,112(r4)
  79         std     r11,120(r3)
  80         stdu    r12,128(r3)
  81         ld      r7,120(r4)
  82         ldu     r8,128(r4)
  83         bdnz    1b
  84
  85         std     r5,8(r3)
  86         std     r6,16(r3)
  87         ld      r9,8(r4)
  88         ld      r10,16(r4)
  89         std     r7,24(r3)
  90         std     r8,32(r3)
  91         ld      r11,24(r4)
  92         ld      r12,32(r4)
  93         std     r9,40(r3)
  94         std     r10,48(r3)
  95         ld      r5,40(r4)
  96         ld      r6,48(r4)
  97         std     r11,56(r3)
  98         std     r12,64(r3)
  99         ld      r7,56(r4)
 100         ld      r8,64(r4)
 101         std     r5,72(r3)
 102         std     r6,80(r3)
 103         ld      r9,72(r4)
 104         ld      r10,80(r4)
 105         std     r7,88(r3)
 106         std     r8,96(r3)
 107         ld      r11,88(r4)
 108         ld      r12,96(r4)
 109         std     r9,104(r3)
 110         std     r10,112(r3)
 111         std     r11,120(r3)
 112         std     r12,128(r3)
 113         blr
 114 EXPORT_SYMBOL(copy_page)