/*
|
* 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 <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[
|
*/
|
V_FUNCTION_BEGIN(__kernel_sync_dicache)
|
.cfi_startproc
|
mflr r12
|
.cfi_register lr,r12
|
mr r11,r3
|
bl __get_datapage@local
|
mtlr r12
|
mr r10,r3
|
|
lwz r7,CFG_DCACHE_BLOCKSZ(r10)
|
addi r5,r7,-1
|
andc r6,r11,r5 /* round low to line bdy */
|
subf r8,r6,r4 /* compute length */
|
add r8,r8,r5 /* ensure we get enough */
|
lwz r9,CFG_DCACHE_LOGBLOCKSZ(r10)
|
srw. r8,r8,r9 /* compute line count */
|
crclr cr0*4+so
|
beqlr /* nothing to do? */
|
mtctr r8
|
1: dcbst 0,r6
|
add r6,r6,r7
|
bdnz 1b
|
sync
|
|
/* Now invalidate the instruction cache */
|
|
lwz r7,CFG_ICACHE_BLOCKSZ(r10)
|
addi r5,r7,-1
|
andc r6,r11,r5 /* round low to line bdy */
|
subf r8,r6,r4 /* compute length */
|
add r8,r8,r5
|
lwz r9,CFG_ICACHE_LOGBLOCKSZ(r10)
|
srw. r8,r8,r9 /* compute line count */
|
crclr cr0*4+so
|
beqlr /* nothing to do? */
|
mtctr r8
|
2: icbi 0,r6
|
add r6,r6,r7
|
bdnz 2b
|
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)
|
