bdceb6a016
The ppc vDSO would not properly clear the return value for some calls, which will be a problem when interfacing those calls with glibc. This should be fixed before 2.6.12 is released (as it is the first kernel with the ppc vDSO) so that we don't have to play with symbol versioning and ugly workarounds. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
68 lines
1.5 KiB
ArmAsm
68 lines
1.5 KiB
ArmAsm
/*
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* vDSO provided cache flush routines
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*
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* Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org),
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* IBM Corp.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/config.h>
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#include <asm/processor.h>
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#include <asm/ppc_asm.h>
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#include <asm/vdso.h>
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#include <asm/offsets.h>
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.text
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/*
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* Default "generic" version of __kernel_sync_dicache.
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*
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* void __kernel_sync_dicache(unsigned long start, unsigned long end)
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*
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* Flushes the data cache & invalidate the instruction cache for the
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* provided range [start, end[
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*
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* Note: all CPUs supported by this kernel have a 128 bytes cache
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* line size so we don't have to peek that info from the datapage
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*/
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V_FUNCTION_BEGIN(__kernel_sync_dicache)
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.cfi_startproc
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li r5,127
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andc r6,r3,r5 /* round low to line bdy */
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subf r8,r6,r4 /* compute length */
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add r8,r8,r5 /* ensure we get enough */
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srwi. r8,r8,7 /* compute line count */
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beqlr /* nothing to do? */
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mtctr r8
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mr r3,r6
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1: dcbst 0,r3
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addi r3,r3,128
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bdnz 1b
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sync
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mtctr r8
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1: icbi 0,r6
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addi r6,r6,128
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bdnz 1b
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isync
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li r3,0
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blr
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.cfi_endproc
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V_FUNCTION_END(__kernel_sync_dicache)
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/*
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* POWER5 version of __kernel_sync_dicache
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*/
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V_FUNCTION_BEGIN(__kernel_sync_dicache_p5)
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.cfi_startproc
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sync
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isync
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li r3,0
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blr
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.cfi_endproc
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V_FUNCTION_END(__kernel_sync_dicache_p5)
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