source: trunk/kernel/syscalls/sys_get_cycle.c @ 541

Last change on this file since 541 was 506, checked in by viala@…, 6 years ago

[syscalls] add interface in implementation.

Add const where possible, fix protoypes to follow interface.

File size: 1.8 KB
Line 
1/*
2 * sys_get_cycle.c - get calling core cycles count.
3 *
4 * Author    Alain Greiner (2016,2017,2018)
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_special.h>
27#include <errno.h>
28#include <core.h>
29#include <thread.h>
30#include <process.h>
31#include <vmm.h>
32#include <printk.h>
33
34#include <syscalls.h>
35
36//////////////////////////////////////
37int sys_get_cycle ( uint64_t * cycle )
38{
39        error_t     error;
40    vseg_t    * vseg;
41        uint64_t    k_cycle;
42
43    thread_t  * this    = CURRENT_THREAD;
44    process_t * process = this->process;
45
46    // check buffer in user space
47    error = vmm_get_vseg( process , (intptr_t)cycle , &vseg );
48
49        if( error )
50        {
51
52#if DEBUG_SYSCALLS_ERROR
53printk("\n[ERROR] in %s : user buffer unmapped %x / thread %x / process %x\n",
54__FUNCTION__ , (intptr_t)cycle , this->trdid , process->pid );
55vmm_display( process , false );
56#endif
57        this->errno = EFAULT;
58                return -1;
59        }
60
61    // call relevant core function
62        k_cycle = hal_get_cycles();
63
64    // copy to user space
65        hal_copy_to_uspace( cycle , &k_cycle , sizeof(uint64_t) );
66
67        return 0; 
68
69}  // end sys_get_cycle()
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