source: trunk/kernel/syscalls/sys_munmap.c @ 635

Last change on this file since 635 was 635, checked in by alain, 15 months ago

This version is a major evolution: The physical memory allocators,
defined in the kmem.c, ppm.c, and kcm.c files have been modified
to support remote accesses. The RPCs that were previously user
to allocate physical memory in a remote cluster have been removed.
This has been done to cure a dead-lock in case of concurrent page-faults.

This version 2.2 has been tested on a (4 clusters / 2 cores per cluster)
TSAR architecture, for both the "sort" and the "fft" applications.

File size: 2.9 KB
Line 
1/*
2 * sys_munmap.c - unmap a mapping from process virtual address space
3 *
4 * Authors       Alain Greiner (2016,2017,2018,2019)
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_vmm.h>
27#include <hal_irqmask.h>
28#include <shared_syscalls.h>
29#include <errno.h>
30#include <thread.h>
31#include <printk.h>
32#include <mapper.h>
33#include <vfs.h>
34#include <process.h>
35#include <vmm.h>
36
37#include <syscalls.h>
38
39////////////////////////////////
40int sys_munmap( void     * vaddr,
41                uint32_t   size )
42{
43    error_t       error;
44    vseg_t      * vseg;
45    reg_t         save_sr;      // required to enable IRQs
46
47        thread_t    * this    = CURRENT_THREAD;
48        process_t   * process = this->process;
49
50#if (DEBUG_SYS_MUNMAP || CONFIG_INSTRUMENTATION_SYSCALLS)
51uint64_t     tm_start = hal_get_cycles();
52#endif
53
54#if DEBUG_SYS_MUNMAP
55if( DEBUG_SYS_MUNMAP < tm_start )
56printk("\n[DBG] %s : thread %x enter / process %x / cycle %d\n",
57__FUNCTION__ , this, process->pid, (uint32_t)tm_start );
58#endif
59
60    // check user buffer is mapped
61    error = vmm_get_vseg( process , (intptr_t)vaddr, &vseg );
62
63    if( error )
64    {
65
66#if DEBUG_SYSCALLS_ERROR
67printk("\n[ERROR] in %s : thread[%x,%x] / user buffer unmapped %x\n",
68__FUNCTION__ , process->pid, this->trdid, (intptr_t)vaddr );
69#endif
70                this->errno = EINVAL;
71                return -1;
72    }
73
74    // enable IRQs
75    hal_enable_irq( &save_sr );
76
77    // call relevant kernel function
78    error = vmm_resize_vseg( process , (intptr_t)vaddr , (intptr_t)size );
79
80    if ( error )
81    {
82
83#if DEBUG_SYSCALLS_ERROR
84printk("\n[ERROR] in %s : cannot remove mapping\n", __FUNCTION__ );
85#endif
86                this->errno = EINVAL;
87                return -1;
88    }
89
90    // restore IRQs
91    hal_restore_irq( save_sr );
92
93#if (DEBUG_SYS_MUNMAP || CONFIG_INSTRUMENTATION_SYSCALLS)
94uint64_t     tm_end = hal_get_cycles();
95#endif
96
97#if CONFIG_INSTRUMENTATION_SYSCALLS
98hal_atomic_add( &syscalls_cumul_cost[SYS_MUNMAP] , tm_end - tm_start );
99hal_atomic_add( &syscalls_occurences[SYS_MUNMAP] , 1 );
100#endif
101
102#if DEBUG_SYS_MUNMAP
103if( DEBUG_SYS_MUNMAP < tm_start )
104printk("\n[DBG] %s : thread %x exit / process %x / cycle %d\n",
105__FUNCTION__ , this, process->pid, (uint32_t)tm_end );
106#endif
107
108    return 0;
109
110}  // end sys_munmap()
111
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