source: trunk/kernel/syscalls/sys_barrier.c @ 46

Last change on this file since 46 was 23, checked in by alain, 8 years ago

Introduce syscalls.
File size: 3.3 KB
Line 
1/*
2 * sys_barrier.c - Access a POSIX barrier.
3 *
4 * authors       Alain Greiner (2016,2017)
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_types.h>
25#include <hal_special.h>
26#include <errno.h>
27#include <thread.h>
28#include <printk.h>
29#include <vmm.h>
30#include <syscalls.h>
31#include <remote_barrier.h>
32
33//////////////////////////////////
34int sys_barrier( void     * vaddr,
35                 uint32_t   operation,
36                 uint32_t   count )
37{
38        error_t      error;
39    paddr_t      paddr;
40 
41    thread_t   * this = CURRENT_THREAD;
42
43    // check vaddr in user vspace
44        error = vmm_v2p_translate( false , vaddr , &paddr );
45        if( error )
46    {
47        printk("\n[ERROR] in %s : illegal barrier virtual address = %x\n",
48               __FUNCTION__ , (intptr_t)vaddr );
49        this->errno = error;
50        return -1;
51    }
52
53    // execute requested operation
54        switch( operation )
55        {
56        //////////////////
57            case BARRIER_INIT:
58        {
59            error = remote_barrier_create( (intptr_t)vaddr , count );
60   
61                    if( error )
62            {
63                printk("\n[ERROR] in %s : cannot create barrier = %x\n",
64                       __FUNCTION__ , (intptr_t)vaddr );
65                this->errno = error;
66                return -1;
67            }
68                        break;
69        }
70        //////////////////
71            case BARRIER_WAIT:
72        {
73            xptr_t barrier_xp = remote_barrier_from_ident( (intptr_t)vaddr );
74
75            if( barrier_xp == XPTR_NULL )     // user error
76            {
77                printk("\n[ERROR] in %s : barrier %x not registered\n",
78                       __FUNCTION__ , (intptr_t)vaddr );
79                this->errno = EINVAL;
80                return -1;
81            }
82            else                          // success
83            {
84                remote_barrier_wait( barrier_xp ); 
85            }
86            break;
87        }
88        /////////////////////
89            case BARRIER_DESTROY:
90        {
91            xptr_t barrier_xp = remote_barrier_from_ident( (intptr_t)vaddr );
92
93            if( barrier_xp == XPTR_NULL )     // user error
94            {
95                printk("\n[ERROR] in %s : barrier %x not registered\n",
96                       __FUNCTION__ , (intptr_t)vaddr );
97                this->errno = EINVAL;
98                return -1;
99            }
100            else                          // success
101            {
102                remote_barrier_destroy( barrier_xp ); 
103            }
104            break;
105        }
106        ////////
107            default:
108        {
109            printk("\n[PANIC] in %s : illegal operation type\n", __FUNCTION__ );
110            hal_core_sleep();
111        }
112        }  // end switch
113
114        return 0;
115
116}  // end sys_barrier()
117
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