kernel/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
  14         .section        ".toc","aw"
  15 PPC64_CACHES:
  16         .tc             ppc64_caches[TC],ppc64_caches
  17         .section        ".text"
  18
  19 _GLOBAL_TOC(copy_page)
  20 BEGIN_FTR_SECTION
  21         lis     r5,PAGE_SIZE@h
  22 FTR_SECTION_ELSE
  23         b       copypage_power7
  24 ALT_FTR_SECTION_END_IFCLR(CPU_FTR_VMX_COPY)
  25         ori     r5,r5,PAGE_SIZE@l
  26 BEGIN_FTR_SECTION
  27         ld      r10,PPC64_CACHES@toc(r2)
  28         lwz     r11,DCACHEL1LOGLINESIZE(r10)    /* log2 of cache line size */
  29         lwz     r12,DCACHEL1LINESIZE(r10)       /* get cache line size */
  30         li      r9,0
  31         srd     r8,r5,r11
  32
  33         mtctr   r8
  34 .Lsetup:
  35         dcbt    r9,r4
  36         dcbz    r9,r3
  37         add     r9,r9,r12
  38         bdnz    .Lsetup
  39 END_FTR_SECTION_IFSET(CPU_FTR_CP_USE_DCBTZ)
  40         addi    r3,r3,-8
  41         srdi    r8,r5,7         /* page is copied in 128 byte strides */
  42         addi    r8,r8,-1        /* one stride copied outside loop */
  43
  44         mtctr   r8
  45
  46         ld      r5,0(r4)
  47         ld      r6,8(r4)
  48         ld      r7,16(r4)
  49         ldu     r8,24(r4)
  50 1:      std     r5,8(r3)
  51         std     r6,16(r3)
  52         ld      r9,8(r4)
  53         ld      r10,16(r4)
  54         std     r7,24(r3)
  55         std     r8,32(r3)
  56         ld      r11,24(r4)
  57         ld      r12,32(r4)
  58         std     r9,40(r3)
  59         std     r10,48(r3)
  60         ld      r5,40(r4)
  61         ld      r6,48(r4)
  62         std     r11,56(r3)
  63         std     r12,64(r3)
  64         ld      r7,56(r4)
  65         ld      r8,64(r4)
  66         std     r5,72(r3)
  67         std     r6,80(r3)
  68         ld      r9,72(r4)
  69         ld      r10,80(r4)
  70         std     r7,88(r3)
  71         std     r8,96(r3)
  72         ld      r11,88(r4)
  73         ld      r12,96(r4)
  74         std     r9,104(r3)
  75         std     r10,112(r3)
  76         ld      r5,104(r4)
  77         ld      r6,112(r4)
  78         std     r11,120(r3)
  79         stdu    r12,128(r3)
  80         ld      r7,120(r4)
  81         ldu     r8,128(r4)
  82         bdnz    1b
  83
  84         std     r5,8(r3)
  85         std     r6,16(r3)
  86         ld      r9,8(r4)
  87         ld      r10,16(r4)
  88         std     r7,24(r3)
  89         std     r8,32(r3)
  90         ld      r11,24(r4)
  91         ld      r12,32(r4)
  92         std     r9,40(r3)
  93         std     r10,48(r3)
  94         ld      r5,40(r4)
  95         ld      r6,48(r4)
  96         std     r11,56(r3)
  97         std     r12,64(r3)
  98         ld      r7,56(r4)
  99         ld      r8,64(r4)
 100         std     r5,72(r3)
 101         std     r6,80(r3)
 102         ld      r9,72(r4)
 103         ld      r10,80(r4)
 104         std     r7,88(r3)
 105         std     r8,96(r3)
 106         ld      r11,88(r4)
 107         ld      r12,96(r4)
 108         std     r9,104(r3)
 109         std     r10,112(r3)
 110         std     r11,120(r3)
 111         std     r12,128(r3)
 112         blr