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/*
* vDSO provided cache flush routines
*
* Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org),
* IBM Corp.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#include <linux/config.h>
#include <asm/processor.h>
#include <asm/ppc_asm.h>
#include <asm/vdso.h>
#include <asm/asm-offsets.h>
.text
/*
* Default "generic" version of __kernel_sync_dicache.
*
* void __kernel_sync_dicache(unsigned long start, unsigned long end)
*
* Flushes the data cache & invalidate the instruction cache for the
* provided range [start, end[
*
* Note: all CPUs supported by this kernel have a 128 bytes cache
* line size so we don't have to peek that info from the datapage
*/
V_FUNCTION_BEGIN(__kernel_sync_dicache)
.cfi_startproc
li r5,127
andc r6,r3,r5 /* round low to line bdy */
subf r8,r6,r4 /* compute length */
add r8,r8,r5 /* ensure we get enough */
srwi. r8,r8,7 /* compute line count */
crclr cr0*4+so
beqlr /* nothing to do? */
mtctr r8
mr r3,r6
1: dcbst 0,r3
addi r3,r3,128
bdnz 1b
sync
mtctr r8
1: icbi 0,r6
addi r6,r6,128
bdnz 1b
isync
li r3,0
blr
.cfi_endproc
V_FUNCTION_END(__kernel_sync_dicache)
/*
* POWER5 version of __kernel_sync_dicache
*/
V_FUNCTION_BEGIN(__kernel_sync_dicache_p5)
.cfi_startproc
crclr cr0*4+so
sync
isync
li r3,0
blr
.cfi_endproc
V_FUNCTION_END(__kernel_sync_dicache_p5)
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