arch/powerpc/kernel/vdso32/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 V_FUNCTION_BEGIN(__kernel_sync_dicache)
  28   .cfi_startproc
  29         mflr    r12
  30   .cfi_register lr,r12
  31         mr      r11,r3
  32         bl      __get_datapage@local
  33         mtlr    r12
  34         mr      r10,r3
  35
  36         lwz     r7,CFG_DCACHE_BLOCKSZ(r10)
  37         addi    r5,r7,-1
  38         andc    r6,r11,r5               /* round low to line bdy */
  39         subf    r8,r6,r4                /* compute length */
  40         add     r8,r8,r5                /* ensure we get enough */
  41         lwz     r9,CFG_DCACHE_LOGBLOCKSZ(r10)
  42         srw.    r8,r8,r9                /* compute line count */
  43         crclr   cr0*4+so
  44         beqlr                           /* nothing to do? */
  45         mtctr   r8
  46 1:      dcbst   0,r6
  47         add     r6,r6,r7
  48         bdnz    1b
  49         sync
  50
  51 /* Now invalidate the instruction cache */
  52
  53         lwz     r7,CFG_ICACHE_BLOCKSZ(r10)
  54         addi    r5,r7,-1
  55         andc    r6,r11,r5               /* round low to line bdy */
  56         subf    r8,r6,r4                /* compute length */
  57         add     r8,r8,r5
  58         lwz     r9,CFG_ICACHE_LOGBLOCKSZ(r10)
  59         srw.    r8,r8,r9                /* compute line count */
  60         crclr   cr0*4+so
  61         beqlr                           /* nothing to do? */
  62         mtctr   r8
  63 2:      icbi    0,r6
  64         add     r6,r6,r7
  65         bdnz    2b
  66         isync
  67         li      r3,0
  68         blr
  69   .cfi_endproc
  70 V_FUNCTION_END(__kernel_sync_dicache)
  71
  72
  73 /*
  74  * POWER5 version of __kernel_sync_dicache
  75  */
  76 V_FUNCTION_BEGIN(__kernel_sync_dicache_p5)
  77   .cfi_startproc
  78         crclr   cr0*4+so
  79         sync
  80         isync
  81         li      r3,0
  82         blr
  83   .cfi_endproc
  84 V_FUNCTION_END(__kernel_sync_dicache_p5)
  85