| 1 | /*
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| 2 | * sys_get_cycle.c - get calling core cycles count.
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| 3 | *
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| 4 | * Author Alain Greiner (2016,2017,2018)
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| 5 | *
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| 6 | * Copyright (c) UPMC Sorbonne Universites
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| 7 | *
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| 8 | * This file is part of ALMOS-MKH.
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| 9 | *
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| 10 | * ALMOS-MKH is free software; you can redistribute it and/or modify it
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| 11 | * under the terms of the GNU General Public License as published by
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| 12 | * the Free Software Foundation; version 2.0 of the License.
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| 13 | *
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| 14 | * ALMOS-MKH is distributed in the hope that it will be useful, but
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| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 17 | * General Public License for more details.
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| 18 | *
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| 19 | * You should have received a copy of the GNU General Public License
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| 20 | * along with ALMOS-MKH; if not, write to the Free Software Foundation,
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| 21 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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| 22 | */
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| 23 |
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| 24 | #include <hal_kernel_types.h>
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| 25 | #include <hal_uspace.h>
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| 26 | #include <hal_special.h>
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| 27 | #include <errno.h>
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| 28 | #include <core.h>
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| 29 | #include <thread.h>
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| 30 | #include <process.h>
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| 31 | #include <vmm.h>
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| 32 | #include <printk.h>
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| 33 |
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| 34 | //////////////////////////////////////
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| 35 | int sys_get_cycle ( uint64_t * cycle )
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| 36 | {
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| 37 | error_t error;
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| 38 | vseg_t * vseg;
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| 39 | uint64_t k_cycle;
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| 40 |
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| 41 | thread_t * this = CURRENT_THREAD;
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| 42 | process_t * process = this->process;
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| 43 |
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| 44 | // check buffer in user space
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| 45 | error = vmm_get_vseg( process , (intptr_t)cycle , &vseg );
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| 46 |
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| 47 | if( error )
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| 48 | {
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| 49 |
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| 50 | #if DEBUG_SYSCALLS_ERROR
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| 51 | printk("\n[ERROR] in %s : user buffer unmapped %x / thread %x / process %x\n",
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| 52 | __FUNCTION__ , (intptr_t)cycle , this->trdid , process->pid );
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| 53 | vmm_display( process , false );
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| 54 | #endif
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| 55 | this->errno = EFAULT;
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| 56 | return -1;
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| 57 | }
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| 58 |
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| 59 | // call relevant core function
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| 60 | k_cycle = hal_get_cycles();
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| 61 |
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| 62 | // copy to user space
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| 63 | hal_copy_to_uspace( cycle , &k_cycle , sizeof(uint64_t) );
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| 64 |
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| 65 | return 0;
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| 66 |
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| 67 | } // end sys_get_cycle()
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