a7f290dad3
This patch moves the vdso's to arch/powerpc, adds support for the 32 bits vdso to the 32 bits kernel, rename systemcfg (finally !), and adds some new (still untested) routines to both vdso's: clock_gettime() with support for CLOCK_REALTIME and CLOCK_MONOTONIC, clock_getres() (same clocks) and get_tbfreq() for glibc to retreive the timebase frequency. Tom,Steve: The implementation of get_tbfreq() I've done for 32 bits returns a long long (r3, r4) not a long. This is such that if we ever add support for >4Ghz timebases on ppc32, the userland interface won't have to change. I have tested gettimeofday() using some glibc patches in both ppc32 and ppc64 kernels using 32 bits userland (I haven't had a chance to test a 64 bits userland yet, but the implementation didn't change and was tested earlier). I haven't tested yet the new functions. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
68 lines
1.5 KiB
ArmAsm
68 lines
1.5 KiB
ArmAsm
/*
|
|
* 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 */
|
|
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
|
|
sync
|
|
isync
|
|
li r3,0
|
|
blr
|
|
.cfi_endproc
|
|
V_FUNCTION_END(__kernel_sync_dicache_p5)
|
|
|