source: trunk/kernel/syscalls/sys_get_cycle.c @ 459

Last change on this file since 459 was 457, checked in by alain, 3 years ago

This version modifies the exec syscall and fixes a large number of small bugs.
The version number has been updated (0.1)

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