git://bbs.cooldavid.org / net-next-2.6.git / blame
| Commit | Line | Data |
|---|---|---|
| b020632e MS |
1 | /* |
| 2 | * Userland implementation of clock_getres() for 64 bits processes in a | |
| 3 | * s390 kernel for use in the vDSO | |
| 4 | * | |
| 5 | * Copyright IBM Corp. 2008 | |
| 6 | * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) | |
| 7 | * | |
| 8 | * This program is free software; you can redistribute it and/or modify | |
| 9 | * it under the terms of the GNU General Public License (version 2 only) | |
| 10 | * as published by the Free Software Foundation. | |
| 11 | */ | |
| 12 | #include <asm/vdso.h> | |
| 13 | #include <asm/asm-offsets.h> | |
| 14 | #include <asm/unistd.h> | |
| 15 | ||
| 16 | .text | |
| 17 | .align 4 | |
| 18 | .globl __kernel_clock_getres | |
| 19 | .type __kernel_clock_getres,@function | |
| 20 | __kernel_clock_getres: | |
| 21 | .cfi_startproc | |
| b3423982 | 22 | cghi %r2,__CLOCK_REALTIME |
| b020632e | 23 | je 0f |
| b3423982 | 24 | cghi %r2,__CLOCK_MONOTONIC |
| c742b31c MS |
25 | je 0f |
| 26 | cghi %r2,-2 /* CLOCK_THREAD_CPUTIME_ID for this thread */ | |
| b020632e | 27 | jne 2f |
| c742b31c MS |
28 | larl %r5,_vdso_data |
| 29 | icm %r0,15,__LC_ECTG_OK(%r5) | |
| 30 | jz 2f | |
| b020632e MS |
31 | 0: ltgr %r3,%r3 |
| 32 | jz 1f /* res == NULL */ | |
| 33 | larl %r1,3f | |
| 34 | lg %r0,0(%r1) | |
| 35 | xc 0(8,%r3),0(%r3) /* set tp->tv_sec to zero */ | |
| 36 | stg %r0,8(%r3) /* store tp->tv_usec */ | |
| 37 | 1: lghi %r2,0 | |
| 38 | br %r14 | |
| 39 | 2: lghi %r1,__NR_clock_getres /* fallback to svc */ | |
| 40 | svc 0 | |
| 41 | br %r14 | |
| b3423982 | 42 | 3: .quad __CLOCK_REALTIME_RES |
| b020632e MS |
43 | .cfi_endproc |
| 44 | .size __kernel_clock_getres,.-__kernel_clock_getres |