source: trunk/kernel/syscalls/sys_get_cycle.c @ 625

Last change on this file since 625 was 625, checked in by alain, 2 years ago

Fix a bug in the vmm_remove_vseg() function: the physical pages
associated to an user DATA vseg were released to the kernel when
the target process descriptor was in the reference cluster.
This physical pages release should be done only when the page
forks counter value is zero.
All other modifications are cosmetic.

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