source: trunk/kernel/syscalls/sys_clock.c @ 1

Last change on this file since 1 was 1, checked in by alain, 5 years ago

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1/*
2 * sys_clock: get system current time
3 *
4 * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless
5 * Copyright (c) 2011,2012 UPMC Sorbonne Universites
6 *
7 * This file is part of ALMOS-kernel.
8 *
9 * ALMOS-kernel is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; version 2.0 of the License.
12 *
13 * ALMOS-kernel is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16 * General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with ALMOS-kernel; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23#include <errno.h>
24#include <config.h>
25#include <cpu.h>
26#include <thread.h>
27
28int sys_clock(uint64_t *val)
29{
30        error_t err;
31        uint64_t cycles;
32
33        if((val == NULL) || NOT_IN_USPACE((uint_t)val))
34        {
35                err = EINVAL;
36                goto fail_inval;
37        }
38
39        cycles = cpu_get_cycles(current_cpu);
40        err    = cpu_copy_to_uspace(val, &cycles, sizeof(cycles));
41
42fail_inval:
43        current_thread->info.errno = err;
44        return err; 
45}
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