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source: trunk/kernel/mm/vmm.c @ 3

Last change on this file since 3 was 1, checked in by alain, 8 years ago
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1	/*
2	* vmm.c - virtual memory manager related operations interface.
3	*
4	* Authors Ghassan Almaless (2008,2009,2010,2011, 2012)
5	* Mohamed Lamine Karaoui (2015)
6	* Alain Greiner (2016)
7	*
8	* Copyright (c) UPMC Sorbonne Universites
9	*
10	* This file is part of ALMOS-MKH.
11	*
12	* ALMOS-MKH is free software; you can redistribute it and/or modify it
13	* under the terms of the GNU General Public License as published by
14	* the Free Software Foundation; version 2.0 of the License.
15	*
16	* ALMOS-MKH is distributed in the hope that it will be useful, but
17	* WITHOUT ANY WARRANTY; without even the implied warranty of
18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19	* General Public License for more details.
20	*
21	* You should have received a copy of the GNU General Public License
22	* along with ALMOS-MKH; if not, write to the Free Software Foundation,
23	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
24	*/
25
26	#include <almos_config.h>
27	#include <hal_types.h>
28	#include <hal_special.h>
29	#include <hal_gpt.h>
30	#include <printk.h>
31	#include <rwlock.h>
32	#include <list.h>
33	#include <bits.h>
34	#include <process.h>
35	#include <thread.h>
36	#include <vseg.h>
37	#include <cluster.h>
38	#include <scheduler.h>
39	#include <vfs.h>
40	#include <mapper.h>
41	#include <page.h>
42	#include <kmem.h>
43	#include <vmm.h>
44
45	//////////////////////////////////////////////////////////////////////////////////
46	// Extern global variables
47	//////////////////////////////////////////////////////////////////////////////////
48
49	extern process_t process_zero; // defined in cluster.c file
50
51
52	////////////////////////////////////
53	void vmm_init( process_t * process )
54	{
55	error_t error;
56	vseg_t * vseg_kentry;
57	vseg_t * vseg_args;
58	vseg_t * vseg_envs;
59	vseg_t * vseg_heap;
60	intptr_t base;
61	intptr_t size;
62
63	// get pointer on VMM
64	vmm_t * vmm = &process->vmm;
65
66	// check UTILS zone size
67	if( (CONFIG_VMM_KENTRY_SIZE + CONFIG_VMM_ARGS_SIZE + CONFIG_VMM_ENVS_SIZE ) >
68	CONFIG_VMM_ELF_BASE )
69	{
70	printk("\n[PANIC] in %s : UTILS zone too small for process %x\n",
71	__FUNCTION__ , process->pid );
72	hal_core_sleep();
73	}
74
75	// check max number of stacks slots
76	if( CONFIG_THREAD_MAX_PER_CLUSTER > 32 )
77	{
78	printk("\n[PANIC] in %s : max number ot threads per cluster for a sihgle process"
79	" cannot be larger than 32\n", __FUNCTION__ );
80	hal_core_sleep();
81	}
82
83	// check STACK zone size
84	if( (CONFIG_VMM_STACK_SIZE * CONFIG_THREAD_MAX_PER_CLUSTER) >
85	(CONFIG_VMM_VSPACE_SIZE - CONFIG_VMM_STACK_BASE) )
86	{
87	printk("\n[PANIC] in %s : STACK zone too small for process %x\n",
88	__FUNCTION__ , process->pid );
89	hal_core_sleep();
90	}
91
92	// initialise the rwlock protecting the vsegs list
93	rwlock_init( &vmm->vsegs_lock );
94
95	// initialize local list of vsegs and radix-tree
96	list_root_init( &vmm->vsegs_root );
97	vmm->vsegs_nr = 0;
98	error = grdxt_init( &vmm->grdxt,
99	CONFIG_VMM_GRDXT_W1,
100	CONFIG_VMM_GRDXT_W2,
101	CONFIG_VMM_GRDXT_W3 );
102	if( error )
103	{
104	printk("\n[PANIC] in %s : cannot initialise radix tree for process %x\n",
105	__FUNCTION__ , process->pid );
106	hal_core_sleep();
107	}
108
109	// register kentry vseg in VMM
110	base = 1 << CONFIG_PPM_PAGE_SHIFT;
111	size = CONFIG_VMM_KENTRY_SIZE << CONFIG_PPM_PAGE_SHIFT;
112	vseg_kentry = vmm_create_vseg( process , base , size , VSEG_TYPE_CODE );
113	if( vseg_kentry == NULL )
114	{
115	printk("\n[PANIC] in %s : cannot register kent vseg for process %x\n",
116	__FUNCTION__ , process->pid );
117	hal_core_sleep();
118	}
119	vmm->kent_vpn_base = 1;
120
121	// register the args vseg in VMM
122	base = (CONFIG_VMM_KENTRY_SIZE + 1 )<<CONFIG_PPM_PAGE_SHIFT;
123	size = CONFIG_VMM_ARGS_SIZE << CONFIG_PPM_PAGE_SHIFT;
124	vseg_args = vmm_create_vseg( process , base , size , VSEG_TYPE_DATA );
125	if( vseg_args == NULL )
126	{
127	printk("\n[PANIC] in %s : cannot register args vseg for process %x\n",
128	__FUNCTION__ , process->pid );
129	hal_core_sleep();
130	}
131	vmm->args_vpn_base = CONFIG_VMM_KENTRY_SIZE + 1;
132
133	// register the envs vseg in VMM
134	base = (CONFIG_VMM_KENTRY_SIZE + CONFIG_VMM_ARGS_SIZE + 1 )<<CONFIG_PPM_PAGE_SHIFT;
135	size = CONFIG_VMM_ENVS_SIZE << CONFIG_PPM_PAGE_SHIFT;
136	vseg_envs = vmm_create_vseg( process , base , size , VSEG_TYPE_DATA );
137	if( vseg_envs == NULL )
138	{
139	printk("\n[PANIC] in %s : cannot register envs vseg for process %x\n",
140	__FUNCTION__ , process->pid );
141	hal_core_sleep();
142	}
143	vmm->envs_vpn_base = CONFIG_VMM_KENTRY_SIZE + CONFIG_VMM_ARGS_SIZE + 1;
144
145	// register the heap vseg in VMM
146	base = CONFIG_VMM_HEAP_BASE << CONFIG_PPM_PAGE_SHIFT;
147	size = (CONFIG_VMM_MMAP_BASE-CONFIG_VMM_HEAP_BASE) << CONFIG_PPM_PAGE_SHIFT;
148	vseg_heap = vmm_create_vseg( process , base , size , VSEG_TYPE_HEAP );
149	if( vseg_heap == NULL )
150	{
151	printk("\n[PANIC] in %s : cannot register heap vseg in for process %x\n",
152	__FUNCTION__ , process->pid );
153	hal_core_sleep();
154	}
155	vmm->heap_vpn_base = CONFIG_VMM_HEAP_BASE;
156
157	// initialize generic page table
158	error = hal_gpt_create( &vmm->gpt );
159	if( error )
160	{
161	printk("PANIC in %s : cannot initialize page table\n", __FUNCTION__ );
162	hal_core_sleep();
163	}
164
165	// initialize STACK allocator
166	vmm->stack_mgr.bitmap = 0;
167	vmm->stack_mgr.vpn_base = CONFIG_VMM_STACK_BASE;
168
169	// initialize MMAP allocator
170	vmm->mmap_mgr.vpn_base = CONFIG_VMM_MMAP_BASE;
171	vmm->mmap_mgr.vpn_size = CONFIG_VMM_STACK_BASE - CONFIG_VMM_MMAP_BASE;
172	vmm->mmap_mgr.first_free_vpn = CONFIG_VMM_MMAP_BASE;
173	uint32_t i;
174	for( i = 0 ; i < 32 ; i++ ) list_root_init( &vmm->mmap_mgr.zombi_list[i] );
175
176	// initialise instrumentation counters
177	vmm->pgfault_nr = 0;
178	vmm->u_err_nr = 0;
179	vmm->m_err_nr = 0;
180
181	hal_wbflush();
182
183	} // end vmm_init()
184
185	///////////////////////////////////////
186	void vmm_destroy( process_t * process )
187	{
188	vseg_t * vseg;
189
190	// get pointer on VMM
191	vmm_t * vmm = &process->vmm;
192
193	// get lock protecting vseg list
194	rwlock_wr_lock( &vmm->vsegs_lock );
195
196	// remove all vsegs registered in vmm
197	while( !list_is_empty( &vmm->vsegs_root ) )
198	{
199	vseg = LIST_FIRST( &vmm->vsegs_root , vseg_t , list );
200	vseg_detach( vmm , vseg );
201	vseg_free( vseg );
202	}
203
204	// delete vsegs radix_tree
205	grdxt_destroy( &vmm->grdxt );
206
207	// release lock
208	rwlock_wr_unlock(&vmm->vsegs_lock);
209
210	// remove all vsegs from zombi_lists in MMAP allocator
211	uint32_t i;
212	for( i = 0 ; i<32 ; i++ )
213	{
214	while( !list_is_empty( &vmm->mmap_mgr.zombi_list[i] ) )
215	{
216	vseg = LIST_FIRST( &vmm->mmap_mgr.zombi_list[i] , vseg_t , list );
217	vseg_detach( vmm , vseg );
218	vseg_free( vseg );
219	}
220	}
221
222	// release memory allocated to the local page table
223	hal_gpt_destroy( &vmm->gpt );
224
225	} // end vmm_destroy()
226
227	/////////////////////////////////////////////////
228	vseg_t * vmm_check_conflict( process_t * process,
229	vpn_t vpn_base,
230	vpn_t vpn_size )
231	{
232	vmm_t * vmm = &process->vmm;
233	vseg_t * vseg;
234	list_entry_t * iter;
235
236	// scan the list of registered vsegs
237	LIST_FOREACH( &vmm->vsegs_root , iter )
238	{
239	vseg = LIST_ELEMENT( iter , vseg_t , list );
240	if( ((vpn_base + vpn_size) > vseg->vpn_base) &&
241	(vpn_base < (vseg->vpn_base + vseg->vpn_size)) ) return vseg;
242	}
243	return NULL;
244	} // vmm_check_conflict()
245
246	////////////////////////////////////////////////////////////////////////////////////////////
247	// This static function is called by the vmm_create_vseg() function, and implements
248	// the VMM stack_vseg specific allocator.
249	////////////////////////////////////////////////////////////////////////////////////////////
250	// @ vmm : pointer on VMM.
251	// @ vpn_base : (return value) first alocated page
252	// @ vpn_size : (return value) number of allocated pages
253	////////////////////////////////////////////////////////////////////////////////////////////
254	static error_t vmm_stack_alloc( vmm_t * vmm,
255	vpn_t * vpn_base,
256	vpn_t * vpn_size )
257	{
258	// get stack allocator pointer
259	stack_mgr_t * mgr = &vmm->stack_mgr;
260
261	// get lock on stack allocator
262	spinlock_lock( &mgr->lock );
263
264	// get first free slot index in bitmap
265	int32_t index = bitmap_ffc( &mgr->bitmap , 4 );
266	if( (index < 0) \|\| (index > 31) ) return ENOMEM;
267
268	// update bitmap
269	bitmap_set( &mgr->bitmap , index );
270
271	// release lock on stack allocator
272	spinlock_unlock( &mgr->lock );
273
274	// returns vpn_base, vpn_size (one page non allocated)
275	vpn_base = mgr->vpn_base + index CONFIG_VMM_STACK_SIZE + 1;
276	*vpn_size = CONFIG_VMM_STACK_SIZE - 1;
277	return 0;
278
279	} // end vmm_stack_alloc()
280
281	////////////////////////////////////////////////////////////////////////////////////////////
282	// This static function is called by the vmm_create_vseg() function, and implements
283	// the VMM MMAP specific allocator.
284	////////////////////////////////////////////////////////////////////////////////////////////
285	// @ vmm : [in] pointer on VMM.
286	// @ npages : [in] requested number of pages.
287	// @ vpn_base : [out] first allocated page.
288	// @ vpn_size : [out] actual number of allocated pages.
289	////////////////////////////////////////////////////////////////////////////////////////////
290	static error_t vmm_mmap_alloc( vmm_t * vmm,
291	vpn_t npages,
292	vpn_t * vpn_base,
293	vpn_t * vpn_size )
294	{
295	uint32_t index;
296	vseg_t * vseg;
297	vpn_t base;
298	vpn_t size;
299	vpn_t free;
300
301	// mmap vseg size must be power of 2
302	// compute actual size and index in zombi_list array
303	size = POW2_ROUNDUP( npages );
304	index = bits_log2( size );
305
306	// get mmap allocator pointer
307	mmap_mgr_t * mgr = &vmm->mmap_mgr;
308
309	// get lock on mmap allocator
310	spinlock_lock( &mgr->lock );
311
312	// get vseg from zombi_list or from mmap zone
313	if( list_is_empty( &mgr->zombi_list[index] ) ) // from mmap zone
314	{
315	// check overflow
316	free = mgr->first_free_vpn;
317	if( (free + size) > mgr->vpn_size ) return ENOMEM;
318
319	// update STACK allocator
320	mgr->first_free_vpn += size;
321
322	// compute base
323	base = free;
324	}
325	else // from zombi_list
326	{
327	// get pointer on zombi vseg from zombi_list
328	vseg = LIST_FIRST( &mgr->zombi_list[index] , vseg_t , list );
329
330	// remove vseg from free-list
331	list_unlink( &vseg->list );
332
333	// compute base
334	base = vseg->vpn_base;
335	}
336
337	// release lock on mmap allocator
338	spinlock_unlock( &mgr->lock );
339
340	// returns vpn_base, vpn_size
341	*vpn_base = base;
342	*vpn_size = size;
343	return 0;
344
345	} // end vmm_mmap_allocator()
346
347	//////////////////////////////////////////////
348	vseg_t * vmm_create_vseg( process_t * process,
349	intptr_t base,
350	intptr_t size,
351	uint32_t type )
352	{
353	vseg_t * vseg; // created vseg pointer
354	vpn_t vpn_base; // vseg first page
355	vpn_t vpn_size; // number of pages
356	error_t error;
357
358	// get pointer on VMM
359	vmm_t * vmm = &process->vmm;
360
361	vmm_dmsg("\n[INFO] %s enter for process %x / base = %x / size = %x / type = %s\n",
362	__FUNCTION__ , process->pid , base , size , vseg_type_name[type] );
363
364	// compute base, size, vpn_base, vpn_size, depending on type
365	// we use the VMM specific allocators for STACK and MMAP vsegs
366	if( type == VSEG_TYPE_STACK )
367	{
368	// get vpn_base and vpn_size from STACK allocator
369	error = vmm_stack_alloc( vmm , &vpn_base , &vpn_size );
370	if( error )
371	{
372	printk("\n[ERROR] in %s : no vspace for stack vseg / process %x in cluster %x\n",
373	__FUNCTION__ , process->pid , local_cxy );
374	return NULL;
375	}
376
377	// compute vseg base and size from vpn_base and vpn_size
378	base = vpn_base << CONFIG_PPM_PAGE_SHIFT;
379	size = vpn_size << CONFIG_PPM_PAGE_SHIFT;
380	}
381	else if( (type == VSEG_TYPE_ANON) \|\|
382	(type == VSEG_TYPE_FILE) \|\|
383	(type == VSEG_TYPE_REMOTE) )
384	{
385	// get vpn_base and vpn_size from MMAP allocator
386	vpn_t npages = size >> CONFIG_PPM_PAGE_SHIFT;
387	error = vmm_mmap_alloc( vmm , npages , &vpn_base , &vpn_size );
388	if( error )
389	{
390	printk("\n[ERROR] in %s : no vspace for mmap vseg / process %x in cluster %x\n",
391	__FUNCTION__ , process->pid , local_cxy );
392	return NULL;
393	}
394
395	// compute vseg base and size from vpn_base and vpn_size
396	base = vpn_base << CONFIG_PPM_PAGE_SHIFT;
397	size = vpn_size << CONFIG_PPM_PAGE_SHIFT;
398	}
399	else
400	{
401	vpn_base = ARROUND_DOWN( base , CONFIG_PPM_PAGE_SIZE ) >> CONFIG_PPM_PAGE_SHIFT;
402	vpn_size = ARROUND_UP( base + size , CONFIG_PPM_PAGE_SIZE ) >> CONFIG_PPM_PAGE_SHIFT;
403	}
404
405	// check collisions
406	vseg = vmm_check_conflict( process , vpn_base , vpn_size );
407	if( vseg != NULL )
408	{
409	printk("\n[ERROR] in %s for process %x : new vseg [vpn_base = %x / vpn_size = %x]\n"
410	" overlap existing vseg [vpn_base = %x / vpn_size = %x]\n",
411	__FUNCTION__ , process->pid, vpn_base, vpn_size,
412	vseg->vpn_base, vseg->vpn_size );
413	return NULL;
414	}
415
416	// allocate physical memory for vseg descriptor
417	vseg = vseg_alloc();
418	if( vseg == NULL )
419	{
420	printk("\n[ERROR] in %s for process %x : cannot allocate memory for vseg\n",
421	__FUNCTION__ , process->pid );
422	return NULL;
423	}
424
425	// initialize vseg descriptor
426	vseg_init( vseg , base, size , vpn_base , vpn_size , type , local_cxy , 0 , 0 );
427
428	// update "heap_vseg" in VMM
429	process->vmm.heap_vseg = vseg;
430
431	// attach vseg to vmm
432	rwlock_wr_lock( &vmm->vsegs_lock );
433	vseg_attach( vmm , vseg );
434	rwlock_wr_unlock( &vmm->vsegs_lock );
435
436	vmm_dmsg("\n[INFO] : %s exit for process %x, vseg [%x, %x] has been mapped\n",
437	__FUNCTION__ , process->pid , vseg->min , vseg->max );
438
439	return vseg;
440
441	} // end vmm_create_vseg()
442
443	/////////////////////////////////////
444	void vmm_remove_vseg( vseg_t * vseg )
445	{
446	// get pointers on calling process and VMM
447	thread_t * this = CURRENT_THREAD;
448	process_t * process = this->process;
449	vmm_t * vmm = &this->process->vmm;
450	uint32_t type = vseg->type;
451
452	// detach vseg from VMM
453	rwlock_wr_lock( &vmm->vsegs_lock );
454	vseg_detach( &process->vmm , vseg );
455	rwlock_wr_unlock( &vmm->vsegs_lock );
456
457	// release the stack slot to VMM stack allocator if STACK type
458	if( type == VSEG_TYPE_STACK )
459	{
460	// get pointer on stack allocator
461	stack_mgr_t * mgr = &vmm->stack_mgr;
462
463	// compute slot index
464	uint32_t index = ((vseg->vpn_base - mgr->vpn_base - 1) / CONFIG_VMM_STACK_SIZE);
465
466	// update stacks_bitmap
467	spinlock_lock( &mgr->lock );
468	bitmap_clear( &mgr->bitmap , index );
469	spinlock_unlock( &mgr->lock );
470	}
471
472	// release the vseg to VMM mmap allocator if MMAP type
473	if( (type == VSEG_TYPE_ANON) \|\| (type == VSEG_TYPE_FILE) \|\| (type == VSEG_TYPE_REMOTE) )
474	{
475	// get pointer on mmap allocator
476	mmap_mgr_t * mgr = &vmm->mmap_mgr;
477
478	// compute zombi_list index
479	uint32_t index = bits_log2( vseg->vpn_size );
480
481	// update zombi_list
482	spinlock_lock( &mgr->lock );
483	list_add_first( &mgr->zombi_list[index] , &vseg->list );
484	spinlock_unlock( &mgr->lock );
485	}
486
487	// release physical memory allocated for vseg descriptor if no MMAP type
488	if( (type != VSEG_TYPE_ANON) && (type != VSEG_TYPE_FILE) && (type != VSEG_TYPE_REMOTE) )
489	{
490	vseg_free( vseg );
491	}
492
493	} // end vmm_remove_vseg()
494
495
496	//////////////////////////////////////////
497	error_t vmm_map_vseg( vseg_t * vseg,
498	uint32_t attr )
499	{
500	vpn_t vpn; // VPN of PTE to be set
501	vpn_t vpn_min; // VPN of first PTE to be set
502	vpn_t vpn_max; // VPN of last PTE to be set (excluded)
503	ppn_t ppn; // PPN of allocated physical page
504	uint32_t order; // ln( number of small pages for one single PTE )
505	page_t * page;
506	error_t error;
507
508	// check vseg type
509	uint32_t type = vseg->type;
510	if( (type != VSEG_TYPE_KCODE) && (type != VSEG_TYPE_KDATA) && (type != VSEG_TYPE_KDEV) )
511	{
512	printk("\n[PANIC] in %s : not a kernel vseg\n", __FUNCTION__ );
513	hal_core_sleep();
514	}
515
516	// get pointer on page table
517	gpt_t * gpt = &process_zero.vmm.gpt;
518
519	// define number of small pages per PTE
520	if( attr & GPT_SMALL ) order = 0; // 1 small page
521	else order = 9; // 512 small pages
522
523	// loop on pages in vseg
524	vpn_min = vseg->vpn_base;
525	vpn_max = vpn_min + vseg->vpn_size;
526	for( vpn = vpn_min ; vpn < vpn_max ; vpn++ )
527	{
528	kmem_req_t req;
529	req.type = KMEM_PAGE;
530	req.size = order;
531	req.flags = AF_KERNEL \| AF_ZERO;
532	page = (page_t *)kmem_alloc( &req );
533	if( page == NULL )
534	{
535	printk("\n[ERROR] in %s : cannot allocate physical memory\n", __FUNCTION__ );
536	return ENOMEM;
537	}
538
539	// set page table entry
540	ppn = ppm_page2ppn( page );
541	error = hal_gpt_set_pte( gpt , vpn , ppn , attr );
542	if( error )
543	{
544	printk("\n[ERROR] in %s : cannot register PPE\n", __FUNCTION__ );
545	return ENOMEM;
546	}
547	}
548
549	return 0;
550	} // end vmm_map_vseg()
551
552	/////////////////////////////////////////
553	void vmm_unmap_vseg( process_t * process,
554	vseg_t * vseg )
555	{
556	vpn_t vpn; // VPN of current PTE
557	vpn_t vpn_min; // VPN of first PTE
558	vpn_t vpn_max; // VPN of last PTE (excluded)
559
560	// get pointer on process page table
561	gpt_t * gpt = &process->vmm.gpt;
562
563	// loop on pages in vseg
564	vpn_min = vseg->vpn_base;
565	vpn_max = vpn_min + vseg->vpn_size;
566	for( vpn = vpn_min ; vpn < vpn_max ; vpn++ )
567	{
568	hal_gpt_reset_pte( gpt , vpn );
569	}
570	} // end vmm_unmap_vseg()
571
572
573	/////////////////////////////////////////////
574	error_t vmm_resize_vseg( process_t * process,
575	intptr_t base,
576	intptr_t size )
577	{
578	error_t error;
579
580	// get pointer on process VMM
581	vmm_t * vmm = &process->vmm;
582
583	intptr_t addr_min = base;
584	intptr_t addr_max = base + size;
585	uint32_t shift = CONFIG_PPM_PAGE_SHIFT;
586
587	// get pointer on vseg
588	vseg_t * vseg = grdxt_lookup( &vmm->grdxt , (uint32_t)(base >> shift) );
589
590	if( vseg == NULL) return EINVAL;
591
592	// get VMM lock protecting vsegs list
593	rwlock_wr_lock( &vmm->vsegs_lock );
594
595	if( (vseg->min > addr_min) \|\| (vseg->max < addr_max) ) // region not included in vseg
596	{
597	error = EINVAL;
598	}
599	else if( (vseg->min == addr_min) && (vseg->max == addr_max) ) // vseg must be removed
600	{
601	vmm_remove_vseg( vseg );
602	error = 0;
603	}
604	else if( vseg->min == addr_min ) // vseg must be resized
605	{
606	printk("\n[PANIC] in %s : resize not implemented yet\n", __FUNCTION__ );
607	hal_core_sleep();
608	error = 0;
609	}
610	else if( vseg->max == addr_max ) // vseg must be resized
611	{
612	printk("\n[PANIC] in %s : resize not implemented yet\n", __FUNCTION__ );
613	hal_core_sleep();
614	error = 0;
615	}
616	else // vseg cut in three regions => vseg must be resized & new vseg created
617	{
618	printk("\n[PANIC] in %s : resize not implemented yet\n", __FUNCTION__ );
619	hal_core_sleep();
620	error = 0;
621	}
622
623	// release VMM lock
624	rwlock_wr_unlock( &vmm->vsegs_lock );
625
626	return error;
627	} // end vmm_resize_vseg()
628
629	///////////////////////////////////////////
630	vseg_t * vmm_get_vseg( process_t * process,
631	intptr_t vaddr )
632	{
633
634	// get pointer on process VMM
635	vmm_t * vmm = &process->vmm;
636
637	// get lock protecting the vseg list
638	rwlock_rd_lock( &vmm->vsegs_lock );
639
640	// get pointer on vseg from radix tree
641	vseg_t * vseg = grdxt_lookup( &vmm->grdxt, (uint32_t)(vaddr >> CONFIG_PPM_PAGE_SHIFT) );
642
643	// release the lock
644	rwlock_rd_unlock( &vmm->vsegs_lock );
645
646	return vseg;
647
648	} // end vmm_get_vseg()
649
650	/////////////////////////////////////////
651	error_t vmm_get_pte( process_t * process,
652	vpn_t vpn,
653	uint32_t * ret_attr,
654	ppn_t * ret_ppn )
655	{
656	vseg_t * vseg; // pointer on vseg containing VPN
657	ppn_t ppn; // PPN from GPT entry
658	uint32_t attr; // attributes from GPT entry
659	error_t error;
660
661	// this function must be called by in the reference cluster
662	if( process->is_ref == false );
663	{
664	printk("\n[PANIC] in %s : not called in the reference cluster\n", __FUNCTION__ );
665	hal_core_sleep();
666	}
667
668	// get VMM pointer
669	vmm_t * vmm = &process->vmm;
670
671	// access GPT to get PTE attributes and PPN
672	hal_gpt_get_pte( &vmm->gpt , vpn , &attr , &ppn );
673
674	// if PTE unmapped => allocate one small physical page to map it
675	if( (attr & GPT_MAPPED) == 0 )
676	{
677	// get vseg pointer
678	vseg = vmm_get_vseg( process , vpn<<CONFIG_PPM_PAGE_SHIFT );
679
680	if( vseg == NULL );
681	{
682	printk("\n[ERROR] in %s : out of segment / process = %x / vpn = %x\n",
683	__FUNCTION__ , process->pid , vpn );
684	return EINVAL;
685	}
686
687	// select the target cluster for physical mapping
688	uint32_t target_cxy;
689	if( vseg->flags & VSEG_DISTRIB ) // depends on VPN LSB
690	{
691	uint32_t x_width = LOCAL_CLUSTER->x_width;
692	uint32_t y_width = LOCAL_CLUSTER->y_width;
693	target_cxy = vpn & ((1<<(x_width + y_width)) - 1);
694	}
695	else // defined in vseg descriptor
696	{
697	target_cxy = vseg->cxy;
698	}
699
700	// allocate memory for page fault
701	kmem_req_t req;
702	page_t * page;
703	if( target_cxy == local_cxy ) // target cluster is the local cluster
704	{
705	req.type = KMEM_PAGE;
706	req.size = 0;
707	req.flags = AF_NONE;
708	page = (page_t *)kmem_alloc( &req );
709
710	error = ( page == NULL ) ? 1 : 0;
711	ppn = ppm_page2ppn( page );
712	}
713	else // target cluster is not the local cluster
714	{
715	rpc_pmem_get_pages_client( target_cxy , 0 , &error , &ppn );
716	}
717
718	if( error )
719	{
720	printk("\n[ERROR] in %s : cannot allocate memory / process = %x / vpn = %x\n",
721	__FUNCTION__ , process->pid , vpn );
722	return ENOMEM;
723	}
724
725	// defineg GPT attributes from vseg flags
726	attr = GPT_MAPPED \| GPT_SMALL;
727	if( vseg->flags & VSEG_USER ) attr \|= GPT_USER;
728	if( vseg->flags & VSEG_WRITE ) attr \|= GPT_WRITABLE;
729	if( vseg->flags & VSEG_EXEC ) attr \|= GPT_EXECUTABLE;
730	if( vseg->flags & VSEG_CACHE ) attr \|= GPT_CACHABLE;
731
732	// set the missing PTE in local VMM
733	error = hal_gpt_set_pte( &vmm->gpt , vpn , ppn , attr );
734	if( error )
735	{
736	printk("\n[ERROR] in %s : cannot register PTE / process = %x / vpn = %x\n",
737	__FUNCTION__ , process->pid , vpn );
738	return ENOMEM;
739	}
740	}
741
742	*ret_ppn = ppn;
743	*ret_attr = attr;
744	return 0;
745	} // end vmm_get_pte()
746
747	///////////////////////////////////////////////////
748	error_t vmm_handle_page_fault( process_t * process,
749	vseg_t * vseg,
750	vpn_t vpn )
751	{
752	uint32_t attr; // missing page attributes
753	ppn_t ppn; // missing page PPN
754	error_t error; // return value
755
756	// get local VMM pointer
757	vmm_t * vmm = &process->vmm;
758
759	// get reference process cluster and local pointer
760	cxy_t ref_cxy = GET_CXY( process->ref_xp );
761	process_t * ref_ptr = (process_t *)GET_PTR( process->ref_xp );
762
763	// get missing PTE attributes and PPN
764	if( local_cxy != ref_cxy ) // local cluster is not the reference cluster
765	{
766	rpc_vmm_get_pte_client( ref_cxy , ref_ptr , vpn , &attr , &ppn , &error );
767	}
768	else // local cluster is the reference cluster
769	{
770	error = vmm_get_pte( process , vpn , &attr , &ppn );
771	}
772
773	// check page allocation error
774	if( error )
775	{
776	printk("\n[ERROR] in %s : cannot allocate memory / process = %x / vpn = %x\n",
777	__FUNCTION__ , process->pid , vpn );
778	return ENOMEM;
779	}
780
781	// set the missing PTE in local VMM
782	error = hal_gpt_set_pte( &vmm->gpt , vpn , attr , ppn );
783	if( error )
784	{
785	printk("\n[ERROR] in %s : cannot register PTE / process = %x / vpn = %x\n",
786	__FUNCTION__ , process->pid , vpn );
787	return ENOMEM;
788	}
789
790	return 0;
791	} // end vmm_handle_page_fault()
792
793	///////////////////////////////////////////
794	error_t vmm_v2p_translate( bool_t ident,
795	void * ptr,
796	paddr_t * paddr )
797	{
798	uint32_t vaddr = (uint32_t)ptr;
799
800	thread_t * this = CURRENT_THREAD;
801	process_t * process = this->process;
802
803	if( ident ) // identity mapping
804	{
805	*paddr = (paddr_t)PADDR( local_cxy , vaddr );
806	return 0;
807	}
808
809	// access page table
810	error_t error;
811	vpn_t vpn;
812	uint32_t attr;
813	ppn_t ppn;
814	uint32_t offset;
815
816	vpn = (vpn_t)( vaddr >> CONFIG_PPM_PAGE_SHIFT );
817	offset = (uint32_t)( vaddr & CONFIG_PPM_PAGE_MASK );
818
819	if( process->is_ref ) // calling process is reference process
820	{
821	error = vmm_get_pte( process, vpn , &attr , &ppn );
822	}
823	else // use a RPC
824	{
825	cxy_t ref_cxy = GET_CXY( process->ref_xp );
826	process_t * ref_ptr = (process_t *)GET_PTR( process->ref_xp );
827	rpc_vmm_get_pte_client( ref_cxy , ref_ptr , vpn , &attr , &ppn , &error );
828	}
829
830	if( error )
831	{
832	printk("\n[ERROR] in %s : cannot get physical address for vaddr = %x\n",
833	__FUNCTION__ , vaddr );
834	return error;
835	}
836
837	// return paddr
838	*paddr = (((paddr_t)ppn) << CONFIG_PPM_PAGE_SHIFT) \| offset;
839	return 0;
840
841	} // end vmm_v2p_translate()
842
843
844
845
846	/*
847
848	///////////////////////////////////////////////////////////////////
849	///////////////////////////////////////////////////////////////////
850	error_t vmm_inval_shared_page( vseg_t *vseg, vma_t vaddr, ppn_t ppn)
851	{
852	pmm_page_info_t current;
853	error_t err;
854
855	error= pmm_get_page(&vseg->vmm->pmm, vaddr, &current);
856
857	if((err) \|\| (current.ppn != ppn))
858	goto ended;
859
860	current.ppn = 0;
861	current.attr = 0;
862	current.cluster = NULL;
863
864	error= pmm_set_page(&vseg->vmm->pmm, vaddr, &current);
865
866	ended:
867	return err;
868	}
869
870	error_t vmm_update_shared_page( vseg_t *vseg, vma_t vaddr, ppn_t ppn)
871	{
872	pmm_page_info_t current;
873	error_t err;
874
875	error= pmm_get_page(&vseg->vmm->pmm, vaddr, &current);
876
877	if((err) \|\| (current.attr != 0))
878	goto ended;
879
880	current.ppn = ppn;
881	current.attr = vseg->vm_pgprot;
882	current.cluster = NULL; // this function is called after invalidate one
883
884	error= pmm_set_page(&vseg->vmm->pmm, vaddr , &current);
885
886	ended:
887	return err;
888	}
889
890	// Hypothesis: the vseg is shared-anon, mapper list is rdlocked, page is locked
891	error_t vmm_migrate_shared_page_seq( vseg_t vseg, struct page_s page, struct page_s **new)
892	{
893	register vseg_t *reg;
894	register struct process_s *process;
895	register struct process_s *this_process;
896	struct page_s *new_pg;
897	struct list_entry *iter;
898	kmem_req_t req;
899	vma_t vaddr;
900	ppn_t ppn;
901	error_t err;
902
903	vaddr = (page->index << PMM_PAGE_SHIFT) + vseg->vm_start + vseg->vm_offset;
904	ppn = ppm_page2ppn(page);
905	this_process = (new == NULL) ? NULL : current_process;
906	iter = &vseg->vm_shared_list;
907	error = ECANCELED;
908
909	// Invalidate All
910	do
911	{
912	reg = list_element(iter, vseg_t, vm_shared_list);
913
914	process = vmm_get_process(reg->vmm);
915
916	if(process != this_process)
917	{
918	error= vmm_inval_shared_page(reg, vaddr, ppn);
919
920	if(err) goto fail_inval;
921	}
922
923	assert(vseg->vm_mapper.m_home_cid == current_cid);
924	iter = list_next(&vseg->vm_mapper.m_reg_root, iter);
925
926	}while(iter != NULL);
927
928	req.type = KMEM_PAGE;
929	req.size = 0;
930	req.excep_code = AF_USER;
931
932	new_pg = kmem_alloc(&req);
933	*new = new_pg;
934
935	if(new_pg == NULL)
936	{
937	error= ENOMEM;
938	goto fail_alloc;
939	}
940
941	page_copy(new_pg, page);
942
943	page_lock(new_pg);
944
945	new_pg->mapper = page->mapper;
946	new_pg->index = page->index;
947
948	// TODO: do the complet job regading dirty page
949	if(PAGE_IS(page, PG_DIRTY))
950	PAGE_SET(new_pg, PG_DIRTY);
951
952	ppn = ppm_page2ppn(new_pg);
953	iter = &vseg->vm_shared_list;
954
955	// Update All
956	do
957	{
958	reg = list_element(iter, vseg_t, vm_shared_list);
959
960	process = vmm_get_process(reg->vmm);
961
962	if(process != this_process)
963	(void) vmm_update_shared_page(reg, vaddr, ppn);
964
965	assert(vseg->vm_mapper.m_home_cid == current_cid);
966	iter = list_next(&vseg->vm_mapper.m_reg_root, iter);
967
968
969	}while(iter != NULL);
970
971	page_unlock(new_pg);
972
973	fail_alloc:
974	fail_inval:
975	return err;
976	}
977
978	//TODO: revisit all manipulation of the page->refcount
979	///////////////////////////////////////////////////////////////
980	static inline error_t vmm_do_migrate( vseg_t * vseg,
981	pmm_page_info_t * pinfo,
982	uint32_t vaddr )
983	{
984	kmem_req_t req;
985	pmm_page_info_t current;
986	page_t * newpage;
987	cluster_t * cluster;
988	thread_t * this;
989	error_t err;
990	ppn_t ppn;
991
992	assert( pinfo->ppn != 0 );
993
994	ppn = pinfo->ppn;
995	this = current_thread;
996	newpage = NULL;
997	cluster = current_cluster;
998
999	current.attr = 0;
1000	current.ppn = 0;
1001
1002	error= pmm_lock_page(&vseg->vmm->pmm, vaddr, &current);
1003
1004	if(error\|\| (current.isAtomic == false) \|\|
1005	(current.ppn != ppn) \|\| !(current.attr & PMM_MIGRATE))
1006	{
1007	#if CONFIG_SHOW_SPURIOUS_PGFAULT
1008	printk(INFO, "%s: pid %d, tid %d, cpu %d, nothing to do for vaddr %x\n",
1009	__FUNCTION__,
1010	this->process->pid,
1011	this->info.order,
1012	cpu_get_id(),
1013	vaddr);
1014	#endif
1015	this->info.spurious_pgfault_cntr ++;
1016	pmm_unlock_page(&vseg->vmm->pmm, vaddr, &current);
1017	pmm_tlb_flush_vaddr(vaddr, PMM_DATA);
1018	return 0;
1019	}
1020
1021	if(!ppn_is_local(ppn))
1022	{
1023	req.type = KMEM_PAGE;
1024	req.size = 0;
1025	req.excep_code = AF_PGFAULT;
1026
1027	newpage = kmem_alloc(&req);
1028
1029	if(newpage)
1030	{
1031	newpage->mapper = NULL;//?
1032	ppn_copy(ppm_page2ppn(newpage), ppn);
1033
1034	if(current.attr & PMM_COW)
1035	{
1036	current.attr \|= PMM_WRITE;
1037	current.attr &= ~(PMM_COW);
1038	}
1039
1040	current.ppn = ppm_page2ppn(newpage);
1041	}
1042	}
1043
1044	current.attr \|= PMM_PRESENT;
1045	current.attr &= ~(PMM_MIGRATE);
1046	current.attr &= ~(PMM_LOCKED);
1047	current.cluster = NULL;
1048
1049	//also unlock the table entry
1050	error= pmm_set_page(&vseg->vmm->pmm, vaddr, &current);
1051
1052	if(err)
1053	{
1054	// TODO: we should differ the kmem_free call
1055	//page_unlock(page);
1056	(void)pmm_unlock_page(&vseg->vmm->pmm, vaddr, &current);
1057	req.ptr = newpage;
1058	kmem_free(&req);
1059	return err;
1060	}
1061
1062
1063	if(newpage)
1064	{
1065	ppn_refcount_down(ppn);
1066	current_thread->info.remote_pages_cntr ++;
1067	#if CONFIG_SHOW_REMOTE_PGALLOC
1068	printk(INFO, "%s: pid %d, tid %x, cpu %d, cid %d: got new remote page from cluster %d (vaddr %x)\n",
1069	__FUNCTION__,
1070	current_process->pid,
1071	current_thread,
1072	cpu_get_id(),
1073	cluster->id,
1074	newpage->cid,
1075	vaddr);
1076	#endif
1077	}
1078
1079	#if CONFIG_SHOW_VMMMGRT_MSG
1080	printk(INFO, "%s: pid %d, tid %d, cpu %d: Asked to migrate page (vaddr %x) from cluster %d to cluster %d, error%d\n",
1081	__FUNCTION__,
1082	current_process->pid,
1083	current_thread->info.order,
1084	cpu_get_id(),
1085	vaddr,
1086	ppn_ppn2cid(ppn),
1087	cluster->id,
1088	err);
1089	#endif
1090
1091	return err;
1092	}
1093
1094	error_t vmm_do_cow( vseg_t vseg, pmm_page_info_t pinfo, uint32_t vaddr)
1095	{
1096	register struct page_s *newpage;
1097	register struct page_s *page;
1098	register struct thread_s *this;
1099	register error_t err;
1100	register uint32_t count;
1101	register bool_t isCountDown;
1102	pmm_page_info_t old;
1103	pmm_page_info_t new;
1104	kmem_req_t req;
1105
1106	this = current_thread;
1107	old.attr = 0;
1108	newpage = NULL;
1109	isCountDown = true;
1110
1111	vmm_dmsg(2,"%s: pid %d, tid %d, cpu %d, vaddr %x\n",
1112	__FUNCTION__,
1113	this->process->pid,
1114	this->info.order,
1115	cpu_get_id(),
1116	vaddr);
1117
1118
1119	error= pmm_lock_page(&vseg->vmm->pmm, vaddr, &old);
1120
1121	//TODO: check this condition
1122	if(error\|\| (old.isAtomic == false) \|\| !(old.attr & PMM_COW))
1123	{
1124	#if CONFIG_SHOW_SPURIOUS_PGFAULT
1125	printk(INFO, "%s: pid %d, tid %d, cpu %d, nothing to do for vaddr %x\n",
1126	__FUNCTION__,
1127	this->process->pid,
1128	this->info.order,
1129	cpu_get_id(),
1130	vaddr);
1131	#endif
1132	this->info.spurious_pgfault_cntr ++;
1133	pmm_tlb_flush_vaddr(vaddr, PMM_DATA);
1134	pmm_unlock_page(&vseg->vmm->pmm, vaddr, &old);
1135	return err;
1136	//goto VMM_COW_END;
1137	}
1138
1139	//if the ppn is local and the others (processus with wich we share the page)
1140	//has done cow, then use the old.ppn directly
1141	if(ppn_is_local(old.ppn))
1142	{
1143	page = ppm_ppn2page(&current_cluster->ppm, old.ppn);
1144
1145	if(page->mapper == NULL)
1146	{
1147	count = page_refcount_get(page);
1148	if(count == 1)
1149	{
1150	newpage = page;//don't copy the page. use it directly.
1151	isCountDown = false;
1152	vmm_dmsg(2, "%s: pid %d, tid %d, cpu %d, reuse same page for vaddr %x, pg_addr %x\n",
1153	__FUNCTION__,
1154	this->process->pid,
1155	this->info.order,
1156	cpu_get_id(),
1157	vaddr,
1158	ppm_page2addr(page));
1159	}
1160	}
1161	//else: we need to do the cow even if it's local!
1162
1163	}
1164
1165	//else: alocate newpage and copy the data from the remote node
1166	//also defcount down the ppn
1167	if(newpage == NULL)
1168	{
1169	req.type = KMEM_PAGE;
1170	req.size = 0;
1171	req.excep_code = AF_PGFAULT;
1172
1173	if((newpage = kmem_alloc(&req)) == NULL)
1174	{
1175	(void)pmm_unlock_page(&vseg->vmm->pmm, vaddr, &old);
1176	return ENOMEM;
1177	}
1178
1179	newpage->mapper = NULL;
1180
1181	ppn_copy(ppm_page2ppn(newpage), old.ppn);
1182	assert(isCountDown);
1183
1184	vmm_dmsg(2,
1185	"%s: pid %d, tid %d, cpu %d, newpage for vaddr %x, pg_addr %x\n",
1186	__FUNCTION__,
1187	this->process->pid,
1188	this->info.order,
1189	cpu_get_id(),
1190	vaddr,
1191	ppm_page2addr(newpage));
1192
1193	if(newpage->cid != current_cid)
1194	this->info.remote_pages_cntr ++;
1195	}
1196
1197	new.attr = vseg->vm_pgprot \| PMM_WRITE;
1198	new.attr &= ~(PMM_COW \| PMM_MIGRATE);
1199	new.ppn = ppm_page2ppn(newpage);
1200	new.cluster = NULL;
1201
1202	//this also unlock the table entry (if no error)
1203	error= pmm_set_page(&vseg->vmm->pmm, vaddr, &new);
1204
1205	if(err)
1206	{
1207	(void)pmm_unlock_page(&vseg->vmm->pmm, vaddr, &old);
1208	req.ptr = newpage;
1209	kmem_free(&req);
1210	vmm_dmsg(3, "%s: ended [ error%d ]\n", __FUNCTION__, err);
1211	return err;
1212	}
1213
1214	if(isCountDown) ppn_refcount_down(old.ppn);
1215
1216	vmm_dmsg(2, "%s, pid %d, tid %d, cpu %d, COW ended [vaddr %x]\n",
1217	__FUNCTION__,
1218	this->process->pid,
1219	this->info.order,
1220	cpu_get_id(),
1221	vaddr);
1222
1223	return 0;
1224	}
1225
1226
1227	//refcount is taken on the file at mmap
1228	static inline error_t vmm_do_mapped( vseg_t *vseg, uint32_t vaddr, uint32_t excep_code)
1229	{
1230	ppn_t ppn;
1231	error_t err;
1232	uint32_t index;
1233	bool_t isDone;
1234	pmm_page_info_t info;
1235	pmm_page_info_t current;
1236	struct thread_s *this;
1237
1238	this = current_thread;
1239
1240	current.attr = 1;
1241	current.ppn = 1;
1242	isDone = false;
1243
1244	error= pmm_lock_page(&vseg->vmm->pmm, vaddr, &current);
1245
1246	if(err) return err;
1247
1248	if((current.isAtomic == false) \|\| (current.attr != 0))
1249	{
1250	#if CONFIG_SHOW_SPURIOUS_PGFAULT
1251	printk(INFO, "%s: pid %d, tid %d, cpu %d, nothing to do for vaddr %x\n",
1252	__FUNCTION__,
1253	this->process->pid,
1254	this->info.order,
1255	cpu_get_id(),
1256	vaddr);
1257	#endif
1258	this->info.spurious_pgfault_cntr ++;
1259	pmm_tlb_flush_vaddr(vaddr, PMM_DATA);
1260	return 0;
1261	}
1262
1263	index = ((vaddr - vseg->vm_start) + vseg->vm_offset) >> PMM_PAGE_SHIFT;
1264
1265	//also hold a refcount!
1266	ppn = mapper_get_ppn(&vseg->vm_mapper,
1267	index,
1268	MAPPER_SYNC_OP);
1269
1270	if(!ppn)
1271	{
1272	error= pmm_unlock_page(&vseg->vmm->pmm, vaddr, &current);
1273	assert(!err); //FIXME: liberate the ppn ...
1274	return (VFS_FILE_IS_NULL(vseg->vm_file)) ? EIO : ENOMEM;
1275	}
1276
1277	info.attr = vseg->vm_pgprot;
1278	info.ppn = ppn;
1279	info.cluster = NULL;
1280
1281	//also unlock the page
1282	error= pmm_set_page(&vseg->vmm->pmm, vaddr, &info);
1283
1284	assert(!err);//FIXME: liberate the ppn and unlock the table entry ...
1285	//error= pmm_unlock_page(&vseg->vmm->pmm, vaddr, &current);
1286
1287	return err;
1288	}
1289
1290	/////////////////////////////////////////////////////
1291	static inline error_t vmm_do_aod( vseg_t *vseg, uint32_t vaddr)
1292	{
1293	register error_t err;
1294	register struct page_s *page;
1295	register struct cluster_s *cluster;
1296	struct thread_s *this;
1297	pmm_page_info_t old;
1298	pmm_page_info_t new;
1299	kmem_req_t req;
1300
1301	page = NULL;
1302	old.attr = 0;
1303	this = current_thread;
1304
1305	error= pmm_lock_page(&vseg->vmm->pmm, vaddr, &old);
1306
1307	if(err) return err;
1308
1309	if(old.isAtomic == false)
1310	{
1311	this->info.spurious_pgfault_cntr ++;
1312	pmm_tlb_flush_vaddr(vaddr, PMM_DATA);
1313	return 0;
1314	}
1315
1316	req.type = KMEM_PAGE;
1317	req.size = 0;
1318	req.excep_code = AF_PGFAULT \| AF_ZERO;
1319
1320	if((page = kmem_alloc(&req)) == NULL)
1321	{
1322	(void)pmm_unlock_page(&vseg->vmm->pmm, vaddr, &old);
1323	return ENOMEM;
1324	}
1325
1326	page->mapper = NULL;
1327
1328	new.attr = vseg->vm_pgprot;
1329	new.ppn = ppm_page2ppn(page);
1330	new.cluster = NULL;
1331
1332	error= pmm_set_page(&vseg->vmm->pmm, vaddr, &new);
1333
1334	if(err) goto fail_set_pg;
1335
1336	cluster = current_cluster;
1337
1338	if(page->cid != cluster->id)
1339	this->info.remote_pages_cntr ++;
1340
1341	return 0;
1342
1343	fail_set_pg:
1344	(void)pmm_unlock_page(&vseg->vmm->pmm, vaddr, &old);
1345	req.ptr = page;
1346	kmem_free(&req);
1347
1348	vmm_dmsg(3, "%s: ended [ error%d ]\n", __FUNCTION__, err);
1349	return err;
1350	}
1351
1352	VSEGION_PAGE_FAULT(vmm_default_pagefault)
1353	{
1354	register struct thread_s *this;
1355	register error_t err;
1356	pmm_page_info_t info;
1357
1358	if((error= pmm_get_page(&vseg->vmm->pmm, vaddr, &info)))
1359	return err;
1360
1361	if((info.attr != 0) && (info.ppn != 0))
1362	{
1363	if((info.attr & PMM_COW) && pmm_except_isWrite(excep_code))
1364	{
1365	error= vmm_do_cow(vseg, &info, vaddr);
1366	return err;
1367	}
1368
1369	if(info.attr & PMM_MIGRATE)
1370	return vmm_do_migrate(vseg, &info, vaddr);
1371
1372	if(info.attr & PMM_PRESENT)
1373	{
1374	this = current_thread;
1375
1376	#if CONFIG_SHOW_SPURIOUS_PGFAULT
1377	printk(WARNING, "WARNING: %s: pid %d, tid %d, cpu %d, excep_code %x but vaddr is valid %x, attr %x, ppn %x\n",
1378	__FUNCTION__,
1379	this->process->pid,
1380	this->info.order,
1381	cpu_get_id(),
1382	excep_code,
1383	vaddr,
1384	info.attr,
1385	info.ppn);
1386	#endif
1387
1388	current_thread->info.spurious_pgfault_cntr ++;
1389	pmm_tlb_flush_vaddr(vaddr, PMM_UNKNOWN);
1390	return 0;
1391	}
1392
1393	current_thread->info.spurious_pgfault_cntr ++;
1394	pmm_tlb_flush_vaddr(vaddr, PMM_UNKNOWN);
1395	return 0;
1396	#if 0
1397	#if CONFIG_SHOW_VMM_ERROR_MSG
1398	printk(ERROR,
1399	"ERROR: %s: pid %d, cpu %d, Unexpected page attributes configuration for vaddr %x, found: ppn %x, attr %x\n",
1400	__FUNCTION__,
1401	current_process->pid,
1402	cpu_get_id(),
1403	vaddr,
1404	info.ppn,
1405	info.attr);
1406	#endif
1407
1408	return EPERM;
1409	#endif
1410	}
1411
1412	if(!MAPPER_IS_NULL(vseg->vm_mapper))
1413	return vmm_do_mapped(vseg, vaddr, excep_code);
1414
1415	return vmm_do_aod(vseg, vaddr);
1416	}
1417
1418	*/
1419
1420

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