arch/ppc64/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 <linux/config.h>
  13 #include <asm/processor.h>
  14 #include <asm/ppc_asm.h>
  15 #include <asm/vdso.h>
  16 #include <asm/offsets.h>
  17
  18         .text
  19
  20 /*
  21  * Default "generic" version of __kernel_sync_dicache.
  22  *
  23  * void __kernel_sync_dicache(unsigned long start, unsigned long end)
  24  *
  25  * Flushes the data cache & invalidate the instruction cache for the
  26  * provided range [start, end[
  27  *
  28  * Note: all CPUs supported by this kernel have a 128 bytes cache
  29  * line size so we don't have to peek that info from the datapage
  30  */
  31 V_FUNCTION_BEGIN(__kernel_sync_dicache)
  32   .cfi_startproc
  33         li      r5,127
  34         andc    r6,r3,r5                /* round low to line bdy */
  35         subf    r8,r6,r4                /* compute length */
  36         add     r8,r8,r5                /* ensure we get enough */
  37         srwi.   r8,r8,7                 /* compute line count */
  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         blr
  51   .cfi_endproc
  52 V_FUNCTION_END(__kernel_sync_dicache)
  53
  54
  55 /*
  56  * POWER5 version of __kernel_sync_dicache
  57  */
  58 V_FUNCTION_BEGIN(__kernel_sync_dicache_p5)
  59   .cfi_startproc
  60         sync
  61         isync
  62         blr
  63   .cfi_endproc
  64 V_FUNCTION_END(__kernel_sync_dicache_p5)