source: trunk/kernel/syscalls/sys_munmap.c

Last change on this file was 641, checked in by alain, 2 years ago
  • Fix several bugs.
  • Introduce the "stat" command in KSH.

This almos-mkh version sucessfully executed the FFT application
(65536 complex points) on the TSAR architecture from 1 to 64 cores.

File size: 5.0 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[%s] thread[%x,%x] enter / cycle %d\n",
57__FUNCTION__, process->pid, this->trdid, (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    // compute unmapped region min an max
75    intptr_t addr_min = (intptr_t)vaddr;
76    intptr_t addr_max = addr_min + size;
77
78
79    // get vseg min & max addresses
80    intptr_t vseg_min = vseg->min; 
81    intptr_t vseg_max = vseg->max; 
82
83    // enable IRQs
84    hal_enable_irq( &save_sr );
85
86    // action depend on both vseg and region bases & sizes
87    if( (vseg_min > addr_min) || (vseg_max < addr_max) )   // region not included in vseg
88    {
89
90#if DEBUG_SYSCALLS_ERROR
91printk("\n[ERROR] in %s : region[%x->%x] / vseg[%x->%x] => non included in vseg\n",
92__FUNCTION__, process->pid, this->trdid, addr_min, addr_max, vseg_min, vseg_max );
93#endif
94                this->errno = EINVAL;
95                return -1;
96    }
97    else if( (vseg_min == addr_min) && (vseg_max == addr_max) ) 
98    {
99
100#if( DEBUG_SYS_MUNMAP & 1 )
101if( DEBUG_SYS_MUNMAP < tm_start )
102printk("\n[%s] thread[%x,%x] unmapped region[%x->%x[ / vseg[%x->%x[ => delete vseg\n",
103__FUNCTION__, process->pid, this->trdid, addr_min, addr_max, vseg_min, vseg_max );
104#endif
105        // delete existing vseg
106        vmm_global_delete_vseg( process,
107                                vseg_min );
108    }
109    else if( (vseg_min == addr_min) || (vseg_max == addr_max) ) 
110    {
111
112#if( DEBUG_SYS_MUNMAP & 1 )
113if( DEBUG_SYS_MUNMAP < tm_start )
114printk("\n[%s] thread[%x,%x] unmapped region[%x->%x[ / vseg[%x->%x[ => resize vseg\n",
115__FUNCTION__, process->pid, this->trdid, addr_min, addr_max, vseg_min, vseg_max );
116#endif
117        // resize existing vseg
118        vmm_global_resize_vseg( process,
119                                vseg_min,
120                                addr_min,
121                                addr_max - addr_min );
122    }
123    else     //  addr_min > vseg_min) && (addr_max < vseg_max)         
124    {
125
126#if( DEBUG_SYS_MUNMAP & 1 )
127if( DEBUG_SYS_MUNMAP < tm_start )
128printk("\n[%s] thread[%x,%x] unmapped region[%x->%x[ / vseg[%x->%x[ => create new vseg\n",
129__FUNCTION__, process->pid, this->trdid, addr_min, addr_max, vseg_min, vseg_max );
130#endif
131        // resize existing vseg
132        vmm_global_resize_vseg( process,
133                                vseg_min,
134                                vseg_min,
135                                addr_min - vseg_min ); 
136
137        // create new vseg
138        vmm_create_vseg( process,
139                         vseg->type,
140                         addr_max,
141                         vseg_max - addr_max,
142                         vseg->file_offset,
143                         vseg->file_size,
144                         vseg->mapper_xp,
145                         vseg->cxy );
146    }
147
148    // restore IRQs
149    hal_restore_irq( save_sr );
150
151#if (DEBUG_SYS_MUNMAP || CONFIG_INSTRUMENTATION_SYSCALLS)
152uint64_t     tm_end = hal_get_cycles();
153#endif
154
155#if CONFIG_INSTRUMENTATION_SYSCALLS
156hal_atomic_add( &syscalls_cumul_cost[SYS_MUNMAP] , tm_end - tm_start );
157hal_atomic_add( &syscalls_occurences[SYS_MUNMAP] , 1 );
158#endif
159
160#if DEBUG_SYS_MUNMAP
161if( DEBUG_SYS_MUNMAP < tm_start )
162printk("\n[%s] thread [%x,%x] exit / cycle %d\n",
163__FUNCTION__ , process->pid, this->trdid, (uint32_t)tm_end );
164#endif
165
166    return 0;
167
168}  // end sys_munmap()
169
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