source: trunk/kernel/syscalls/sys_sem.c @ 595

Last change on this file since 595 was 566, checked in by alain, 6 years ago

Complete restructuration of kernel locks.

File size: 7.4 KB
RevLine 
[1]1/*
2 * sys_sem.c - Acces a POSIX unamed semaphore.
3 *
[440]4 * Authors     Alain Greiner (2016,2017,2018)
[1]5 *
[23]6 * Copyright (c) UPMC Sorbonne Universites
[1]7 *
[23]8 * This file is part of ALMOS-MKH.
9 *
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>
[457]26#include <shared_semaphore.h>
[23]27#include <errno.h>
28#include <thread.h>
29#include <printk.h>
30#include <vmm.h>
[1]31#include <remote_sem.h>
[23]32#include <syscalls.h>
[1]33
[457]34#if DEBUG_SYS_SEM
35//////////////////////////////////////////////////
36static char * sys_sem_op_str( uint32_t operation )
37{
38        if     ( operation == SEM_INIT     ) return "INIT";
39        else if( operation == SEM_WAIT     ) return "WAIT";
40        else if( operation == SEM_POST     ) return "POST";
41        else if( operation == SEM_GETVALUE ) return "GETVALUE";
42        else if( operation == SEM_DESTROY  ) return "DESTROY";
43        else                                 return "undefined";
44}
45#endif
46
[1]47//////////////////////////////////
[457]48int sys_sem( void         * vaddr,            // semaphore virtual  address
49             uint32_t       operation,        // requested operation type
50             uint32_t       init_value,       // initial value
51             uint32_t     * current_value )   // pointer on current value buffer
[1]52{
[566]53        vseg_t         * vseg;        // for vaddr check
[440]54    error_t          error;
[1]55
[440]56    thread_t       * this    = CURRENT_THREAD;
57    process_t      * process = this->process;
[1]58
[457]59#if DEBUG_SYS_SEM
60uint64_t    tm_start;
61uint64_t    tm_end;
62tm_start = hal_get_cycles();
63if( DEBUG_SYS_SEM < tm_start )
64printk("\n[DBG] %s : thread %x in process %x enter for %s / cycle %d\n",
65__FUNCTION__, this->trdid, process->pid, sys_sem_op_str( operation ), (uint32_t)tm_start );
66#endif
67
[1]68    // check vaddr in user vspace
[440]69        error = vmm_get_vseg( process , (intptr_t)vaddr , &vseg );
[23]70        if( error )
[1]71    {
[440]72
73#if DEBUG_SYSCALLS_ERROR
[469]74printk("\n[ERROR] in %s : unmapped semaphore pointer %x / thread %x in process %x / cycle %d\n",
75__FUNCTION__ , (intptr_t)vaddr, this->trdid, process->pid, (uint32_t)hal_get_cycles() );
[440]76vmm_display( process , false );
77#endif
78        this->errno = EINVAL;
[1]79        return -1;
80    }
81
82    // execute requested operation
83        switch( operation )
84        {
85        //////////////
86            case SEM_INIT:
87        {
[457]88            // call relevant kernel function to initialize semaphore
89            error = remote_sem_create( (intptr_t)vaddr , 
[566]90                                       init_value );
[1]91            if ( error )
92            {
[457]93
94#if DEBUG_SYSCALLS_ERROR
[469]95printk("\n[ERROR] in %s INIT: cannot create semaphore / thread %x in process %x / cycle %d\n",
96__FUNCTION__, this->trdid, process->pid, (uint32_t)hal_get_cycles() );
[457]97#endif
98                this->errno = ENOMEM;
[1]99                return -1;
100            }
101        }
[566]102        break;
[1]103        //////////////////
104        case SEM_GETVALUE:
105        {
[457]106            // check current_value buffer in user vspace
107                error = vmm_get_vseg( process , (intptr_t)current_value , &vseg );
108            if( error )
109            {
110
111#if DEBUG_SYSCALLS_ERROR
[566]112printk("\n[ERROR] in %s GETVALUE: unmapped buffer %x / thread %x in process %x / cycle %d\n",
[469]113__FUNCTION__ , (intptr_t)current_value, this->trdid, process->pid, (uint32_t)hal_get_cycles() );
[457]114vmm_display( process , false );
115#endif
116                this->errno = EINVAL;
117                return -1;
118            }
119
[1]120            // get extended pointer on remote semaphore
[566]121            xptr_t sem_xp = remote_sem_from_ident( (intptr_t)vaddr );
[1]122
[457]123            // check semaphore registered
124            if( sem_xp == XPTR_NULL )
[1]125            {
[440]126
127#if DEBUG_SYSCALLS_ERROR
[469]128printk("\n[ERROR] in %s GETVALUE: semaphore %x not found / thread %x in process %x / cycle %d\n",
129__FUNCTION__ , (intptr_t)vaddr, this->trdid, process->pid, (uint32_t)hal_get_cycles() );
[440]130#endif
[1]131                this->errno = EINVAL;
132                return -1;
133            }
[457]134
135            // call relevant kernel function to get semaphore current value
[566]136            uint32_t current;
[457]137                    remote_sem_get_value( sem_xp , &current );
[1]138 
[457]139            // return value to user
140            hal_copy_to_uspace( current_value , &current , sizeof(uint32_t) );
[1]141        }
[566]142        break;
[1]143        //////////////
144            case SEM_WAIT:
145        { 
146            // get extended pointer on remote semaphore
[566]147            xptr_t sem_xp = remote_sem_from_ident( (intptr_t)vaddr );
[1]148
[457]149            // check semaphore registered
150            if( sem_xp == XPTR_NULL )
[1]151            {
[440]152
153#if DEBUG_SYSCALLS_ERROR
[469]154printk("\n[ERROR] in %s WAIT: semaphore %x not found / thread %x in process %x / cycle %d\n",
155__FUNCTION__ , (intptr_t)vaddr, this->trdid, process->pid, (uint32_t)hal_get_cycles() );
156vmm_display( process , true );
[440]157#endif
[1]158                this->errno = EINVAL;
159                return -1;
160            }
[457]161
162            // call relevant kernel function to wait semaphore available
163            remote_sem_wait( sem_xp );
[1]164        }
[566]165        break;
[1]166        //////////////
167            case SEM_POST:
168        {
169            // get extended pointer on remote semaphore
[566]170            xptr_t sem_xp = remote_sem_from_ident( (intptr_t)vaddr );
[1]171
[457]172            // check semaphore registered
173            if( sem_xp == XPTR_NULL )
[1]174            {
[440]175
176#if DEBUG_SYSCALLS_ERROR
[469]177printk("\n[ERROR] in %s POST: semaphore %x not found / thread %x in process %x / cycle %d\n",
178__FUNCTION__ , (intptr_t)vaddr, this->trdid, process->pid, (uint32_t)hal_get_cycles() );
[440]179#endif
[1]180                this->errno = EINVAL;
181                return -1;
182            }
[457]183
184            // call relevant kernel function to release semaphore
185            remote_sem_post( sem_xp );
[1]186        }
[566]187                break;
[1]188        /////////////////
189            case SEM_DESTROY:
190        {
191            // get extended pointer on remote semaphore
[566]192            xptr_t sem_xp = remote_sem_from_ident( (intptr_t)vaddr );
[1]193
[457]194            // check semaphore registered
195            if( sem_xp == XPTR_NULL )
[1]196            {
[440]197
198#if DEBUG_SYSCALLS_ERROR
[469]199printk("\n[ERROR] in %s DESTROY: semaphore %x not found / thread %x in process %x / cycle %d\n",
200__FUNCTION__ , (intptr_t)vaddr, this->trdid, process->pid, (uint32_t)hal_get_cycles() );
[440]201#endif
[1]202                this->errno = EINVAL;
203                return -1;
204            }
[457]205
206            // destroy semaphore
207            remote_sem_destroy( sem_xp );
[1]208            }   
[566]209        break;
[1]210        ///////
211            default:  // undefined operation                       
212        {
[457]213
214#if DEBUG_SYSCALLS_ERROR
[469]215printk("\n[ERROR] in %s : undefined operation type %d / thread %x in process %x / cycle %d\n",
216__FUNCTION__ , operation, this->trdid, process->pid, (uint32_t)hal_get_cycles() );
[457]217#endif
218            this->errno = EINVAL;
219            return -1;
[1]220        }
221        }
222
[457]223    hal_fence();
224
225#if DEBUG_SYS_SEM
226tm_end = hal_get_cycles();
227if( DEBUG_SYS_SEM < tm_end )
[566]228printk("\n[DBG] %s : thread %x in process %x exit for %s / cost = %d / cycle %d\n",
229__FUNCTION__, this->trdid, process->pid, sys_sem_op_str( operation ),
230(uint32_t)(tm_end - tm_start), (uint32_t)tm_end );
[457]231#endif
232
[1]233    return 0;
234
235}  // end sys_sem()
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