source: trunk/kernel/syscalls/sys_clock.c @ 101

Last change on this file since 101 was 101, checked in by alain, 5 years ago

euh...

File size: 1.7 KB
RevLine 
[1]1/*
[23]2 * sys_clock: get calling core cycles count
[1]3 *
[23]4 * Author    Alain Greiner (2016,2017)
5 * 
6 * Copyright (c) UPMC Sorbonne Universites
[1]7 *
[23]8 * This file is part of ALMOS-MKH.
[1]9 *
[23]10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
[1]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 *
[23]14 * ALMOS-MKH is distributed in the hope that it will be useful, but
[1]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
[23]20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
[1]21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
[23]24#include <hal_types.h>
25#include <hal_uspace.h>
[101]26#include <hal_special.h>
[1]27#include <errno.h>
[23]28#include <core.h>
[1]29#include <thread.h>
[23]30#include <process.h>
31#include <vmm.h>
32#include <printk.h>
[1]33
[23]34//////////////////////////////////
35int sys_clock (uint64_t * cycles )
[1]36{
[23]37        error_t   error;
38    paddr_t   paddr;
39        uint64_t  k_cycles;
[1]40
[23]41    thread_t  * this    = CURRENT_THREAD;
42    process_t * process = this->process;
43
44    // check buffer in user space
45    error = vmm_v2p_translate( false , cycles , &paddr );
46
47        if( error )
[1]48        {
[23]49        printk("\n[ERROR] in %s : user buffer unmapped for thread %x in process %x\n",
50               __FUNCTION__ , this->trdid , process->pid );
51        this->errno = EFAULT;
52                return -1;
[1]53        }
54
[23]55    // call relevant core function
[101]56        k_cycles = hal_get_cycles();
[1]57
[23]58    // copy to user space
59        hal_copy_to_uspace( cycles , &k_cycles , sizeof(uint64_t) );
60
61        return 0; 
62
63}  // end sys_clock()
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