source: trunk/kernel/syscalls/sys_timeofday.c @ 635

Last change on this file since 635 was 635, checked in by alain, 18 months ago

This version is a major evolution: The physical memory allocators,
defined in the kmem.c, ppm.c, and kcm.c files have been modified
to support remote accesses. The RPCs that were previously user
to allocate physical memory in a remote cluster have been removed.
This has been done to cure a dead-lock in case of concurrent page-faults.

This version 2.2 has been tested on a (4 clusters / 2 cores per cluster)
TSAR architecture, for both the "sort" and the "fft" applications.

File size: 2.3 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    // check tz (non supported / must be null)
53    if( tz )
54    {
55
56#if DEBUG_SYSCALLS_ERROR
57printk("\n[ERROR] in %s for thread %x in process %x : tz argument must be NULL\n",
58__FUNCTION__ , this->trdid , process->pid );
59#endif
60        this->errno = EINVAL;
61        return -1;
62    }
63 
64    // check tv
65    error = vmm_get_vseg( process , (intptr_t)tv , &vseg );
66
67    if( error )
68    {
69
70#if DEBUG_SYSCALLS_ERROR
71printk("\n[ERROR] in %s : user buffer tz unmapped / thread %x / process %x\n",
72__FUNCTION__ , (intptr_t)tz , this->trdid , process->pid );
73#endif
74        this->errno = EINVAL;
75        return -1;
76    }
77
78    // get time from calling core descriptor
79    core_get_time( this->core , &tm_s , &tm_us );
80        k_tv.tv_sec  = tm_s;
81        k_tv.tv_usec = tm_us;
82
83    // copy values to user space
84        hal_copy_to_uspace( local_cxy,
85                        &k_tv,
86                        tv,
87                        sizeof(struct timeval) );
88
89    hal_fence();
90
91        return 0; 
92
93}  // end sys_timeofday()
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