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b020632e MS |
1 | /* |
2 | * Userland implementation of gettimeofday() for 32 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 | #include <asm/vdso.h> | |
17 | #include <asm/asm-offsets.h> | |
18 | #include <asm/unistd.h> | |
19 | ||
20 | .text | |
21 | .align 4 | |
22 | .globl __kernel_gettimeofday | |
23 | .type __kernel_gettimeofday,@function | |
24 | __kernel_gettimeofday: | |
25 | .cfi_startproc | |
26 | basr %r5,0 | |
27 | 0: al %r5,13f-0b(%r5) /* get &_vdso_data */ | |
28 | 1: ltr %r3,%r3 /* check if tz is NULL */ | |
29 | je 2f | |
30 | mvc 0(8,%r3),__VDSO_TIMEZONE(%r5) | |
31 | 2: ltr %r2,%r2 /* check if tv is NULL */ | |
32 | je 10f | |
33 | l %r4,__VDSO_UPD_COUNT+4(%r5) /* load update counter */ | |
34 | tml %r4,0x0001 /* pending update ? loop */ | |
35 | jnz 1b | |
36 | stck 24(%r15) /* Store TOD clock */ | |
37 | lm %r0,%r1,24(%r15) | |
38 | s %r0,__VDSO_XTIME_STAMP(%r5) /* TOD - cycle_last */ | |
39 | sl %r1,__VDSO_XTIME_STAMP+4(%r5) | |
40 | brc 3,3f | |
41 | ahi %r0,-1 | |
42 | 3: mhi %r0,1000 /* cyc2ns(clock,cycle_delta) */ | |
43 | st %r0,24(%r15) | |
44 | lhi %r0,1000 | |
45 | ltr %r1,%r1 | |
46 | mr %r0,%r0 | |
47 | jnm 4f | |
48 | ahi %r0,1000 | |
49 | 4: al %r0,24(%r15) | |
50 | srdl %r0,12 | |
51 | al %r0,__VDSO_XTIME_NSEC(%r5) /* + xtime */ | |
52 | al %r1,__VDSO_XTIME_NSEC+4(%r5) | |
53 | brc 12,5f | |
54 | ahi %r0,1 | |
55 | 5: mvc 24(4,%r15),__VDSO_XTIME_SEC+4(%r5) | |
56 | cl %r4,__VDSO_UPD_COUNT+4(%r5) /* check update counter */ | |
57 | jne 1b | |
58 | l %r4,24(%r15) /* get tv_sec from stack */ | |
59 | basr %r5,0 | |
60 | 6: ltr %r0,%r0 | |
61 | jnz 7f | |
62 | cl %r1,11f-6b(%r5) | |
63 | jl 8f | |
64 | 7: ahi %r4,1 | |
65 | sl %r1,11f-6b(%r5) | |
66 | brc 3,6b | |
67 | ahi %r0,-1 | |
68 | j 6b | |
69 | 8: st %r4,0(%r2) /* store tv->tv_sec */ | |
70 | ltr %r1,%r1 | |
71 | m %r0,12f-6b(%r5) | |
72 | jnm 9f | |
73 | al %r0,12f-6b(%r5) | |
74 | 9: srl %r0,6 | |
75 | st %r0,4(%r2) /* store tv->tv_usec */ | |
76 | 10: slr %r2,%r2 | |
77 | br %r14 | |
78 | 11: .long 1000000000 | |
79 | 12: .long 274877907 | |
80 | 13: .long _vdso_data - 0b | |
81 | .cfi_endproc | |
82 | .size __kernel_gettimeofday,.-__kernel_gettimeofday |