source: trunk/kernel/syscalls/sys_get_cycle.c @ 628

Last change on this file since 628 was 626, checked in by alain, 6 years ago

This version has been tested on the sort multithreaded application
for TSAR_IOB architectures ranging from 1 to 8 clusters.
It fixes three bigs bugs:
1) the dev_ioc device API has been modified: the dev_ioc_sync_read()
and dev_ioc_sync_write() function use now extended pointers on the
kernel buffer to access a mapper stored in any cluster.
2) the hal_uspace API has been modified: the hal_copy_to_uspace()
and hal_copy_from_uspace() functions use now a (cxy,ptr) couple
to identify the target buffer (equivalent to an extended pointer.
3) an implementation bug has been fixed in the assembly code contained
in the hal_copy_to_uspace() and hal_copy_from_uspace() functions.

File size: 1.8 KB
RevLine 
[1]1/*
[407]2 * sys_get_cycle.c - get calling core cycles count.
[1]3 *
[440]4 * Author    Alain Greiner (2016,2017,2018)
[23]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
[457]24#include <hal_kernel_types.h>
[23]25#include <hal_uspace.h>
[625]26#include <hal_vmm.h>
[101]27#include <hal_special.h>
[1]28#include <errno.h>
[23]29#include <core.h>
[1]30#include <thread.h>
[23]31#include <process.h>
32#include <vmm.h>
33#include <printk.h>
[1]34
[506]35#include <syscalls.h>
36
[407]37//////////////////////////////////////
38int sys_get_cycle ( uint64_t * cycle )
[1]39{
[440]40        error_t     error;
41    vseg_t    * vseg;
42        uint64_t    k_cycle;
[1]43
[23]44    thread_t  * this    = CURRENT_THREAD;
45    process_t * process = this->process;
46
47    // check buffer in user space
[440]48    error = vmm_get_vseg( process , (intptr_t)cycle , &vseg );
[23]49
50        if( error )
[1]51        {
[440]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 );
[624]56hal_vmm_display( process , false );
[440]57#endif
[23]58        this->errno = EFAULT;
59                return -1;
[1]60        }
61
[23]62    // call relevant core function
[407]63        k_cycle = hal_get_cycles();
[1]64
[23]65    // copy to user space
[626]66        hal_copy_to_uspace( local_cxy, &k_cycle, cycle, sizeof(uint64_t) );
[23]67
68        return 0; 
69
[407]70}  // end sys_get_cycle()
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