LXR linux/arch/powerpc/lib/copypage

   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/processor.h>
  10#include <asm/ppc_asm.h>
  11#include <asm/asm-offsets.h>
  12
  13        .section        ".toc","aw"
  14PPC64_CACHES:
  15        .tc             ppc64_caches[TC],ppc64_caches
  16        .section        ".text"
  17
  18
  19_GLOBAL(copy_4K_page)
  20        li      r5,4096         /* 4K page size */
  21BEGIN_FTR_SECTION
  22        ld      r10,PPC64_CACHES@toc(r2)
  23        lwz     r11,DCACHEL1LOGLINESIZE(r10)    /* log2 of cache line size */
  24        lwz     r12,DCACHEL1LINESIZE(r10)       /* get cache line size */
  25        li      r9,0
  26        srd     r8,r5,r11
  27
  28        mtctr   r8
  29.Lsetup:
  30        dcbt    r9,r4
  31        dcbz    r9,r3
  32        add     r9,r9,r12
  33        bdnz    .Lsetup
  34END_FTR_SECTION_IFSET(CPU_FTR_CP_USE_DCBTZ)
  35        addi    r3,r3,-8
  36        srdi    r8,r5,7         /* page is copied in 128 byte strides */
  37        addi    r8,r8,-1        /* one stride copied outside loop */
  38
  39        mtctr   r8
  40
  41        ld      r5,0(r4)
  42        ld      r6,8(r4)
  43        ld      r7,16(r4)
  44        ldu     r8,24(r4)
  451:      std     r5,8(r3)
  46        std     r6,16(r3)
  47        ld      r9,8(r4)
  48        ld      r10,16(r4)
  49        std     r7,24(r3)
  50        std     r8,32(r3)
  51        ld      r11,24(r4)
  52        ld      r12,32(r4)
  53        std     r9,40(r3)
  54        std     r10,48(r3)
  55        ld      r5,40(r4)
  56        ld      r6,48(r4)
  57        std     r11,56(r3)
  58        std     r12,64(r3)
  59        ld      r7,56(r4)
  60        ld      r8,64(r4)
  61        std     r5,72(r3)
  62        std     r6,80(r3)
  63        ld      r9,72(r4)
  64        ld      r10,80(r4)
  65        std     r7,88(r3)
  66        std     r8,96(r3)
  67        ld      r11,88(r4)
  68        ld      r12,96(r4)
  69        std     r9,104(r3)
  70        std     r10,112(r3)
  71        ld      r5,104(r4)
  72        ld      r6,112(r4)
  73        std     r11,120(r3)
  74        stdu    r12,128(r3)
  75        ld      r7,120(r4)
  76        ldu     r8,128(r4)
  77        bdnz    1b
  78
  79        std     r5,8(r3)
  80        std     r6,16(r3)
  81        ld      r9,8(r4)
  82        ld      r10,16(r4)
  83        std     r7,24(r3)
  84        std     r8,32(r3)
  85        ld      r11,24(r4)
  86        ld      r12,32(r4)
  87        std     r9,40(r3)
  88        std     r10,48(r3)
  89        ld      r5,40(r4)
  90        ld      r6,48(r4)
  91        std     r11,56(r3)
  92        std     r12,64(r3)
  93        ld      r7,56(r4)
  94        ld      r8,64(r4)
  95        std     r5,72(r3)
  96        std     r6,80(r3)
  97        ld      r9,72(r4)
  98        ld      r10,80(r4)
  99        std     r7,88(r3)
 100        std     r8,96(r3)
 101        ld      r11,88(r4)
 102        ld      r12,96(r4)
 103        std     r9,104(r3)
 104        std     r10,112(r3)
 105        std     r11,120(r3)
 106        std     r12,128(r3)
 107        blr
 108