source: trunk/kernel/syscalls/sys_clock.c @ 23

Last change on this file since 23 was 23, checked in by alain, 4 years ago

Introduce syscalls.

File size: 1.7 KB
Line 
1/*
2 * sys_clock: get calling core cycles count
3 *
4 * Author    Alain Greiner (2016,2017)
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_types.h>
25#include <hal_uspace.h>
26#include <errno.h>
27#include <core.h>
28#include <thread.h>
29#include <process.h>
30#include <vmm.h>
31#include <printk.h>
32
33//////////////////////////////////
34int sys_clock (uint64_t * cycles )
35{
36        error_t   error;
37    paddr_t   paddr;
38        uint64_t  k_cycles;
39
40    thread_t  * this    = CURRENT_THREAD;
41    process_t * process = this->process;
42
43    // check buffer in user space
44    error = vmm_v2p_translate( false , cycles , &paddr );
45
46        if( error )
47        {
48        printk("\n[ERROR] in %s : user buffer unmapped for thread %x in process %x\n",
49               __FUNCTION__ , this->trdid , process->pid );
50        this->errno = EFAULT;
51                return -1;
52        }
53
54    // call relevant core function
55        k_cycles = core_get_cycles( this->core );
56
57    // copy to user space
58        hal_copy_to_uspace( cycles , &k_cycles , sizeof(uint64_t) );
59
60        return 0; 
61
62}  // end sys_clock()
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