arch/powerpc/kernel/vdso64/cacheflush.S

   1 /*
   2  * vDSO provided cache flush routines
   3  *
   4  * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org),
   5  *                    IBM Corp.
   6  *
   7  * This program is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU General Public License
   9  * as published by the Free Software Foundation; either version
  10  * 2 of the License, or (at your option) any later version.
  11  */
  12 #include <asm/processor.h>
  13 #include <asm/ppc_asm.h>
  14 #include <asm/vdso.h>
  15 #include <asm/asm-offsets.h>
  16
  17         .text
  18
  19 /*
  20  * Default "generic" version of __kernel_sync_dicache.
  21  *
  22  * void __kernel_sync_dicache(unsigned long start, unsigned long end)
  23  *
  24  * Flushes the data cache & invalidate the instruction cache for the
  25  * provided range [start, end[
  26  *
  27  * Note: all CPUs supported by this kernel have a 128 bytes cache
  28  * line size so we don't have to peek that info from the datapage
  29  */
  30 V_FUNCTION_BEGIN(__kernel_sync_dicache)
  31   .cfi_startproc
  32         li      r5,127
  33         andc    r6,r3,r5                /* round low to line bdy */
  34         subf    r8,r6,r4                /* compute length */
  35         add     r8,r8,r5                /* ensure we get enough */
  36         srwi.   r8,r8,7                 /* compute line count */
  37         crclr   cr0*4+so
  38         beqlr                           /* nothing to do? */
  39         mtctr   r8
  40         mr      r3,r6
  41 1:      dcbst   0,r3
  42         addi    r3,r3,128
  43         bdnz    1b
  44         sync
  45         mtctr   r8
  46 1:      icbi    0,r6
  47         addi    r6,r6,128
  48         bdnz    1b
  49         isync
  50         li      r3,0
  51         blr
  52   .cfi_endproc
  53 V_FUNCTION_END(__kernel_sync_dicache)
  54
  55
  56 /*
  57  * POWER5 version of __kernel_sync_dicache
  58  */
  59 V_FUNCTION_BEGIN(__kernel_sync_dicache_p5)
  60   .cfi_startproc
  61         crclr   cr0*4+so
  62         sync
  63         isync
  64         li      r3,0
  65         blr
  66   .cfi_endproc
  67 V_FUNCTION_END(__kernel_sync_dicache_p5)