source: trunk/kernel/syscalls/sys_timeofday.c @ 637

Last change on this file since 637 was 637, checked in by alain, 3 years ago

Introduce the non-standard pthread_parallel_create() system call
and re-write the <fft> and <sort> applications to improve the
intrinsic paralelism in applications.

File size: 3.1 KB
Line 
1/*
2 * sys_timeofday.c - Get current time
3 *
4 * Author    Alain Greiner (2016,2017,2018,2019)
5 *
6 * Copyright (c) UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MKH.
9 *
10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2.0 of the License.
13 *
14 * ALMOS-MKH is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#include <hal_kernel_types.h>
25#include <hal_uspace.h>
26#include <hal_vmm.h>
27#include <thread.h>
28#include <printk.h>
29#include <errno.h>
30#include <process.h>
31#include <vmm.h>
32#include <core.h>
33#include <shared_syscalls.h>
34
35#include <syscalls.h>
36
37////////////////////////////////////////
38int sys_timeofday( struct timeval  * tv,
39                   struct timezone * tz )
40{
41        error_t        error;
42    vseg_t       * vseg;
43
44        uint32_t       tm_s;
45    uint32_t       tm_us;
46
47        struct timeval k_tv;
48
49        thread_t  *    this    = CURRENT_THREAD;
50        process_t *    process = this->process;
51
52#if (DEBUG_SYS_TIMEOFDAY || CONFIG_INSTRUMENTATION_SYSCALLS)
53uint64_t     tm_start = hal_get_cycles();
54#endif
55
56#if DEBUG_SYS_TIMEOFDAY
57if( DEBUG_SYS_TIMEOFDAY < tm_start )
58printk("\n[%s] thread[%x,%x] enter / cycle %d\n",
59__FUNCTION__, process->pid, this->trdid, (uint32_t)tm_start );
60#endif
61 
62    // check tz (non supported / must be null)
63    if( tz )
64    {
65
66#if DEBUG_SYSCALLS_ERROR
67printk("\n[ERROR] in %s for thread %x in process %x : tz argument must be NULL\n",
68__FUNCTION__ , this->trdid , process->pid );
69#endif
70        this->errno = EINVAL;
71        return -1;
72    }
73 
74    // check tv
75    error = vmm_get_vseg( process , (intptr_t)tv , &vseg );
76
77    if( error )
78    {
79
80#if DEBUG_SYSCALLS_ERROR
81printk("\n[ERROR] in %s : user buffer tz unmapped / thread %x / process %x\n",
82__FUNCTION__ , (intptr_t)tz , this->trdid , process->pid );
83#endif
84        this->errno = EINVAL;
85        return -1;
86    }
87
88    // get time from calling core descriptor
89    core_get_time( this->core , &tm_s , &tm_us );
90        k_tv.tv_sec  = tm_s;
91        k_tv.tv_usec = tm_us;
92
93    // copy values to user space
94        hal_copy_to_uspace( tv,
95                        XPTR( local_cxy , &k_tv ),
96                        sizeof(struct timeval) );
97
98    hal_fence();
99
100#if (DEBUG_SYS_TIMEOFDAY || CONFIG_INSTRUMENTATION_SYSCALLS)
101uint64_t     tm_end = hal_get_cycles();
102#endif
103
104#if DEBUG_SYS_TIMEOFDAY
105if( DEBUG_SYS_TIMEOFDAY < tm_end )
106printk("\n[%s] thread[%x,%x] exit / cycle %d\n",
107__FUNCTION__, process->pid, this->trdid, (uint32_t)tm_end );
108#endif
109 
110#if CONFIG_INSTRUMENTATION_SYSCALLS
111hal_atomic_add( &syscalls_cumul_cost[SYS_TIMEOFDAY] , tm_end - tm_start );
112hal_atomic_add( &syscalls_occurences[SYS_TIMEOFDAY] , 1 );
113#endif
114
115        return 0; 
116
117}  // end sys_timeofday()
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