source: trunk/kernel/mm/page.c @ 20

Last change on this file since 20 was 18, checked in by max@…, 5 years ago

cosmetic, and a few typos

File size: 7.0 KB
Line 
1/*
2 * page.c - physical page related operations implementation
3 *
4 * Authors  Ghassan Almaless (2008,2009,2010,2011,2012)
5 *          Alain Greiner    (2016)
6 *
7 * Copyright (c) UPMC Sorbonne Universites
8 *
9 * This file is part of ALMOS-MKH.
10 *
11 * ALMOS-MKH is free software; you can redistribute it and/or modify it
12 * under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; version 2.0 of the License.
14 *
15 * ALMOS-MKH is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
22 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25#include <hal_types.h>
26#include <hal_special.h>
27#include <hal_atomic.h>
28#include <list.h>
29#include <xlist.h>
30#include <memcpy.h>
31#include <thread.h>
32#include <scheduler.h>
33#include <cluster.h>
34#include <ppm.h>
35#include <mapper.h>
36#include <printk.h>
37#include <vfs.h>
38#include <process.h>
39#include <page.h>
40
41
42
43////////////////////////////////////////
44inline void page_init( page_t   * page )
45{
46        page->flags    = 0;
47        page->order    = 0;
48        page->index    = 0;
49        page->mapper   = NULL;
50        page->private  = 0;
51    page->refcount = 0;
52        spinlock_init( &page->lock );
53        list_entry_init( &page->list );
54}
55
56////////////////////////////////////////////
57inline void page_set_flag( page_t   * page,
58                           uint16_t   value )
59{
60    hal_atomic_or( (uint32_t *)&page->flags , (uint32_t)value );
61}
62
63//////////////////////////////////////////////
64inline void page_clear_flag( page_t   * page,
65                             uint16_t   value )
66{
67    hal_atomic_and( (uint32_t *)&page->flags , ~((uint32_t)value) );
68}
69
70//////////////////////////////////////////////
71inline bool_t page_is_flag( page_t   * page,
72                            uint16_t   value )
73{
74    return (bool_t)(page->flags & value);
75}
76
77//////////////////////////////////////
78bool_t page_do_dirty( page_t * page )
79{
80        bool_t done = false;
81
82    ppm_t * ppm = &LOCAL_CLUSTER->ppm;
83
84    // lock the PPM dirty_list
85        spinlock_lock( &ppm->dirty_lock );
86
87        if( !page_is_flag( page , PG_DIRTY ) )
88        {
89        // set dirty flag in page descriptor
90                page_set_flag( page , PG_DIRTY );
91
92        // register page in PPM dirty list
93                list_add_first( &ppm->dirty_root , &page->list );
94                done = true;
95        }
96
97    // unlock the PPM dirty_list
98        spinlock_unlock( &ppm->dirty_lock );
99
100        return done;
101}
102
103////////////////////////////////////////
104bool_t page_undo_dirty( page_t * page )
105{
106        bool_t done = false;
107
108    ppm_t * ppm = &LOCAL_CLUSTER->ppm;
109
110    // lock the dirty_list
111        spinlock_lock( &ppm->dirty_lock );
112
113        if( page_is_flag( page , PG_DIRTY) )
114        {
115        // clear dirty flag in page descriptor
116                page_clear_flag( page , PG_DIRTY );
117
118        // remove page from PPM dirty list
119                list_unlink( &page->list );
120                done = true;
121        }
122
123    // unlock the dirty_list
124        spinlock_unlock( &ppm->dirty_lock );
125
126        return done;
127}
128
129/////////////////////
130void sync_all_pages()
131{
132        page_t   * page;
133        mapper_t * mapper;
134    uint32_t   index;
135    ppm_t    * ppm = &LOCAL_CLUSTER->ppm;
136
137    // lock the dirty_list
138        spinlock_lock( &ppm->dirty_lock );
139
140        while( !list_is_empty( &ppm->dirty_root ) )
141        {
142                page = LIST_FIRST( &ppm->dirty_root ,  page_t , list );
143
144        // unlock the dirty_list
145            spinlock_unlock( &ppm->dirty_lock );
146
147                mapper = page->mapper;
148        index  = page->index;
149
150        // lock the page
151                page_lock( page );
152
153        // sync the page
154                mapper_sync_page( mapper , index , page );
155
156        // unlock the page
157                page_unlock( page );
158
159        // lock the dirty_list
160            spinlock_lock( &ppm->dirty_lock );
161        }
162
163    // unlock the dirty_list
164        spinlock_unlock( &ppm->dirty_lock );
165
166} // end sync_all_pages()
167
168///////////////////////////////
169void page_lock( page_t * page )
170{
171    // take the spinlock protecting the PG_LOCKED flag
172        spinlock_lock( &page->lock );
173
174        if( page_is_flag( page , PG_LOCKED ) )  // page is already locked
175        {
176        // get pointer on calling thread
177        thread_t * thread = CURRENT_THREAD;
178
179        // register thread in the page waiting queue
180        xlist_add_last( XPTR( local_cxy , &page->wait_root ),
181                        XPTR( local_cxy , &thread->wait_list ) );
182
183        // release the spinlock
184                spinlock_unlock( &page->lock );
185
186        // deschedule the calling thread
187        thread_block( thread , THREAD_BLOCKED_PAGE );
188                sched_yield();
189        }
190        else                                    // page is not locked
191        {
192        // set the PG_LOCKED flag
193                page_set_flag( page , PG_LOCKED );
194
195        // release the spinlock
196                spinlock_unlock( &page->lock );
197        }
198}
199
200/////////////////////////////////
201void page_unlock( page_t * page )
202{
203    // take the spinlock protecting the PG_LOCKED flag
204        spinlock_lock( &page->lock );
205
206    // check the page waiting list
207        bool_t is_empty = xlist_is_empty( XPTR( local_cxy , &page->wait_root ) );
208
209        if( is_empty == false )    // at least one waiting thread => resume it
210    {
211        // get an extended pointer on the first waiting thread
212        xptr_t root_xp   = XPTR( local_cxy , &page->wait_root );
213        xptr_t thread_xp = XLIST_FIRST_ELEMENT( root_xp , thread_t , wait_list );
214
215        // reactivate the first waiting thread
216        thread_unblock( thread_xp , THREAD_BLOCKED_PAGE );
217    }
218        else                      // no waiting thread => clear the PG_LOCKED flag
219        {
220        page_clear_flag( page , PG_LOCKED );
221    }
222
223    // release the spinlock
224        spinlock_unlock( &page->lock );
225}
226
227////////////////////////////////////////////
228inline void page_refcount_up( page_t *page )
229{
230    hal_atomic_inc( &page->refcount );
231}
232
233//////////////////////////////////////////////
234inline void page_refcount_down( page_t *page )
235{
236    hal_atomic_dec( &page->refcount );
237}
238
239//////////////////////////////
240void page_copy(  page_t * dst,
241                 page_t * src )
242{
243        uint32_t  size;
244        void    * src_base;
245        void    * dst_base;
246
247        if( dst->order != src->order )
248    {
249        printk("\n[PANIC] in %s : src size != dst size\n", __FUNCTION__ );
250        hal_core_sleep();
251    }
252
253        size = (1 << dst->order) * CONFIG_PPM_PAGE_SIZE;
254        src_base = ppm_page2base( src );
255        dst_base = ppm_page2base( dst );
256
257        memcpy( dst_base , src_base , size );
258}
259
260///////////////////////////////
261void page_zero( page_t * page )
262{
263        uint32_t   size;
264        void     * base;
265
266        size = (1 << page->order) * CONFIG_PPM_PAGE_SIZE;
267        base = ppm_page2base( page );
268
269// kmem_print_kcm_table();
270
271// printk("\n@@@ in page_zero : size = %x / base = %x / kcm_tbl = %x\n",
272//        size , (uint32_t)base , (uint32_t)(&LOCAL_CLUSTER->kcm_tbl[0] ) );
273
274        memset( base , 0 , size );
275
276// kmem_print_kcm_table();
277
278}
279
280////////////////////////////////
281void page_print( page_t * page )
282{
283        printk("*** Page %d : base = %x / flags = %x / order = %d / count = %d\n",
284                page->index,
285                ppm_page2base( page ),
286                page->flags,
287                page->order,
288                page->refcount );
289}
290
291
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