projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| a17ae4c3 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
| b020632e MS |
2 | /* |
| 3 | * Userland implementation of gettimeofday() for 64 bits processes in a | |
| 4 | * s390 kernel for use in the vDSO | |
| 5 | * | |
| 6 | * Copyright IBM Corp. 2008 | |
| 7 | * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com) | |
| b020632e MS |
8 | */ |
| 9 | #include <asm/vdso.h> | |
| 10 | #include <asm/asm-offsets.h> | |
| 11 | #include <asm/unistd.h> | |
| bc3703f2 | 12 | #include <asm/dwarf.h> |
| b020632e MS |
13 | |
| 14 | .text | |
| 15 | .align 4 | |
| 16 | .globl __kernel_gettimeofday | |
| 17 | .type __kernel_gettimeofday,@function | |
| 18 | __kernel_gettimeofday: | |
| 19 | .cfi_startproc | |
| 9b2efe03 | 20 | aghi %r15,-16 |
| b020632e MS |
21 | larl %r5,_vdso_data |
| 22 | 0: ltgr %r3,%r3 /* check if tz is NULL */ | |
| 23 | je 1f | |
| 24 | mvc 0(8,%r3),__VDSO_TIMEZONE(%r5) | |
| 25 | 1: ltgr %r2,%r2 /* check if tv is NULL */ | |
| 26 | je 4f | |
| 27 | lg %r4,__VDSO_UPD_COUNT(%r5) /* load update counter */ | |
| 28 | tmll %r4,0x0001 /* pending update ? loop */ | |
| 29 | jnz 0b | |
| 9b2efe03 HC |
30 | stcke 0(%r15) /* Store TOD clock */ |
| 31 | lg %r1,1(%r15) | |
| 75c7b6f3 MS |
32 | lg %r0,__VDSO_TS_END(%r5) /* TOD steering end time */ |
| 33 | slgr %r0,%r1 /* now - ts_steering_end */ | |
| 34 | ltgr %r0,%r0 /* past end of steering ? */ | |
| 35 | jm 6f | |
| 36 | srlg %r0,%r0,15 /* 1 per 2^16 */ | |
| 37 | tm __VDSO_TS_DIR+3(%r5),0x01 /* steering direction? */ | |
| 38 | jz 7f | |
| 39 | lcgr %r0,%r0 /* negative TOD offset */ | |
| 40 | 7: algr %r1,%r0 /* add steering offset */ | |
| 41 | 6: sg %r1,__VDSO_XTIME_STAMP(%r5) /* TOD - cycle_last */ | |
| 79c74ecb MS |
42 | msgf %r1,__VDSO_TK_MULT(%r5) /* * tk->mult */ |
| 43 | alg %r1,__VDSO_XTIME_NSEC(%r5) /* + tk->xtime_nsec */ | |
| 44 | lg %r0,__VDSO_XTIME_SEC(%r5) /* tk->xtime_sec */ | |
| b020632e MS |
45 | clg %r4,__VDSO_UPD_COUNT(%r5) /* check update counter */ |
| 46 | jne 0b | |
| 79c74ecb MS |
47 | lgf %r5,__VDSO_TK_SHIFT(%r5) /* Timekeeper shift */ |
| 48 | srlg %r1,%r1,0(%r5) /* >> tk->shift */ | |
| b020632e MS |
49 | larl %r5,5f |
| 50 | 2: clg %r1,0(%r5) | |
| 51 | jl 3f | |
| 52 | slg %r1,0(%r5) | |
| 53 | aghi %r0,1 | |
| 54 | j 2b | |
| 55 | 3: stg %r0,0(%r2) /* store tv->tv_sec */ | |
| 56 | slgr %r0,%r0 /* tv_nsec -> tv_usec */ | |
| 57 | ml %r0,8(%r5) | |
| 58 | srlg %r0,%r0,6 | |
| 59 | stg %r0,8(%r2) /* store tv->tv_usec */ | |
| 60 | 4: lghi %r2,0 | |
| 9b2efe03 | 61 | aghi %r15,16 |
| b020632e MS |
62 | br %r14 |
| 63 | 5: .quad 1000000000 | |
| 64 | .long 274877907 | |
| 65 | .cfi_endproc | |
| 66 | .size __kernel_gettimeofday,.-__kernel_gettimeofday |