forked from luck/tmp_suning_uos_patched
b7eacb59cd
Add CLOCK_REALTIME_COARSE and CLOCK_MONOTONIC_COARSE optimization to the 64-bit and 31-bit vdso. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
53 lines
1.3 KiB
ArmAsm
53 lines
1.3 KiB
ArmAsm
/*
|
|
* Userland implementation of clock_getres() for 64 bits processes in a
|
|
* s390 kernel for use in the vDSO
|
|
*
|
|
* Copyright IBM Corp. 2008
|
|
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com)
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License (version 2 only)
|
|
* as published by the Free Software Foundation.
|
|
*/
|
|
#include <asm/vdso.h>
|
|
#include <asm/asm-offsets.h>
|
|
#include <asm/unistd.h>
|
|
|
|
.text
|
|
.align 4
|
|
.globl __kernel_clock_getres
|
|
.type __kernel_clock_getres,@function
|
|
__kernel_clock_getres:
|
|
.cfi_startproc
|
|
larl %r1,4f
|
|
cghi %r2,__CLOCK_REALTIME_COARSE
|
|
je 0f
|
|
cghi %r2,__CLOCK_MONOTONIC_COARSE
|
|
je 0f
|
|
larl %r1,3f
|
|
cghi %r2,__CLOCK_REALTIME
|
|
je 0f
|
|
cghi %r2,__CLOCK_MONOTONIC
|
|
je 0f
|
|
cghi %r2,__CLOCK_THREAD_CPUTIME_ID
|
|
je 0f
|
|
cghi %r2,-2 /* Per-thread CPUCLOCK with PID=0, VIRT=1 */
|
|
jne 2f
|
|
larl %r5,_vdso_data
|
|
icm %r0,15,__LC_ECTG_OK(%r5)
|
|
jz 2f
|
|
0: ltgr %r3,%r3
|
|
jz 1f /* res == NULL */
|
|
lg %r0,0(%r1)
|
|
xc 0(8,%r3),0(%r3) /* set tp->tv_sec to zero */
|
|
stg %r0,8(%r3) /* store tp->tv_usec */
|
|
1: lghi %r2,0
|
|
br %r14
|
|
2: lghi %r1,__NR_clock_getres /* fallback to svc */
|
|
svc 0
|
|
br %r14
|
|
3: .quad __CLOCK_REALTIME_RES
|
|
4: .quad __CLOCK_COARSE_RES
|
|
.cfi_endproc
|
|
.size __kernel_clock_getres,.-__kernel_clock_getres
|