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source: trunk/kernel/mm/vmm.c @ 332

Last change on this file since 332 was 315, checked in by alain, 7 years ago
Redefine the fuctions ppm_base2page() / ppm_page2base() / ppm_page2ppn() / ppm_ppn2page() / ppm_base2ppn() / ppm_ppn2base(), to use explicitely extended pointers.
File size: 47.2 KB

Rev	Line
[1]	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)
[21]	7	*
[1]	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
[14]	26	#include <kernel_config.h>
[1]	27	#include <hal_types.h>
	28	#include <hal_special.h>
	29	#include <hal_gpt.h>
	30	#include <printk.h>
[23]	31	#include <memcpy.h>
[1]	32	#include <rwlock.h>
	33	#include <list.h>
	34	#include <bits.h>
	35	#include <process.h>
	36	#include <thread.h>
	37	#include <vseg.h>
	38	#include <cluster.h>
	39	#include <scheduler.h>
	40	#include <vfs.h>
	41	#include <mapper.h>
	42	#include <page.h>
	43	#include <kmem.h>
	44	#include <vmm.h>
	45
	46	//////////////////////////////////////////////////////////////////////////////////
	47	// Extern global variables
	48	//////////////////////////////////////////////////////////////////////////////////
	49
	50	extern process_t process_zero; // defined in cluster.c file
	51
	52
	53	////////////////////////////////////
	54	void vmm_init( process_t * process )
[21]	55	{
[1]	56	error_t error;
	57	vseg_t * vseg_kentry;
	58	vseg_t * vseg_args;
	59	vseg_t * vseg_envs;
	60	vseg_t * vseg_heap;
	61	intptr_t base;
	62	intptr_t size;
	63
[204]	64	vmm_dmsg("\n[INFO] %s : enter for process %x\n", __FUNCTION__ , process->pid );
	65
[1]	66	// get pointer on VMM
	67	vmm_t * vmm = &process->vmm;
	68
[204]	69	assert( ((CONFIG_VMM_KENTRY_SIZE + CONFIG_VMM_ARGS_SIZE + CONFIG_VMM_ENVS_SIZE)
	70	<= CONFIG_VMM_ELF_BASE) , __FUNCTION__ , "UTILS zone too small\n" );
[21]	71
[204]	72	assert( (CONFIG_THREAD_MAX_PER_CLUSTER <= 32) , __FUNCTION__ ,
	73	"no more than 32 threads per cluster for a single process\n");
[1]	74
[204]	75	assert( ((CONFIG_VMM_STACK_SIZE * CONFIG_THREAD_MAX_PER_CLUSTER) <=
	76	(CONFIG_VMM_VSPACE_SIZE - CONFIG_VMM_STACK_BASE)) , __FUNCTION__ ,
	77	"STACK zone too small\n");
[1]	78
[21]	79	// initialize the rwlock protecting the vsegs list
[1]	80	rwlock_init( &vmm->vsegs_lock );
	81
	82	// initialize local list of vsegs and radix-tree
[23]	83	vmm->vsegs_nr = 0;
[1]	84	list_root_init( &vmm->vsegs_root );
	85	error = grdxt_init( &vmm->grdxt,
	86	CONFIG_VMM_GRDXT_W1,
	87	CONFIG_VMM_GRDXT_W2,
	88	CONFIG_VMM_GRDXT_W3 );
[204]	89
	90	assert( (error == 0) , __FUNCTION__ , "cannot initialize radix tree\n" );
[1]	91
	92	// register kentry vseg in VMM
	93	base = 1 << CONFIG_PPM_PAGE_SHIFT;
	94	size = CONFIG_VMM_KENTRY_SIZE << CONFIG_PPM_PAGE_SHIFT;
	95	vseg_kentry = vmm_create_vseg( process , base , size , VSEG_TYPE_CODE );
[204]	96
	97	assert( (vseg_kentry != NULL) , __FUNCTION__ , "cannot register kentry vseg\n" );
	98
[1]	99	vmm->kent_vpn_base = 1;
	100
	101	// register the args vseg in VMM
	102	base = (CONFIG_VMM_KENTRY_SIZE + 1 )<<CONFIG_PPM_PAGE_SHIFT;
	103	size = CONFIG_VMM_ARGS_SIZE << CONFIG_PPM_PAGE_SHIFT;
	104	vseg_args = vmm_create_vseg( process , base , size , VSEG_TYPE_DATA );
[204]	105
	106	assert( (vseg_args != NULL) , __FUNCTION__ , "cannot register args vseg\n" );
	107
[1]	108	vmm->args_vpn_base = CONFIG_VMM_KENTRY_SIZE + 1;
	109
	110	// register the envs vseg in VMM
	111	base = (CONFIG_VMM_KENTRY_SIZE + CONFIG_VMM_ARGS_SIZE + 1 )<<CONFIG_PPM_PAGE_SHIFT;
	112	size = CONFIG_VMM_ENVS_SIZE << CONFIG_PPM_PAGE_SHIFT;
	113	vseg_envs = vmm_create_vseg( process , base , size , VSEG_TYPE_DATA );
[204]	114
	115	assert( (vseg_envs != NULL) , __FUNCTION__ , "cannot register envs vseg\n" );
	116
[1]	117	vmm->envs_vpn_base = CONFIG_VMM_KENTRY_SIZE + CONFIG_VMM_ARGS_SIZE + 1;
	118
	119	// register the heap vseg in VMM
	120	base = CONFIG_VMM_HEAP_BASE << CONFIG_PPM_PAGE_SHIFT;
	121	size = (CONFIG_VMM_MMAP_BASE-CONFIG_VMM_HEAP_BASE) << CONFIG_PPM_PAGE_SHIFT;
	122	vseg_heap = vmm_create_vseg( process , base , size , VSEG_TYPE_HEAP );
[204]	123
	124	assert( (vseg_heap != NULL) , __FUNCTION__ , "cannot register heap vseg\n" );
	125
[1]	126	vmm->heap_vpn_base = CONFIG_VMM_HEAP_BASE;
	127
	128	// initialize generic page table
	129	error = hal_gpt_create( &vmm->gpt );
	130
[204]	131	assert( (error == 0) , __FUNCTION__ , "cannot initialize page table\n");
	132
[1]	133	// initialize STACK allocator
	134	vmm->stack_mgr.bitmap = 0;
	135	vmm->stack_mgr.vpn_base = CONFIG_VMM_STACK_BASE;
	136
	137	// initialize MMAP allocator
	138	vmm->mmap_mgr.vpn_base = CONFIG_VMM_MMAP_BASE;
	139	vmm->mmap_mgr.vpn_size = CONFIG_VMM_STACK_BASE - CONFIG_VMM_MMAP_BASE;
	140	vmm->mmap_mgr.first_free_vpn = CONFIG_VMM_MMAP_BASE;
	141	uint32_t i;
	142	for( i = 0 ; i < 32 ; i++ ) list_root_init( &vmm->mmap_mgr.zombi_list[i] );
	143
[21]	144	// initialize instrumentation counters
[1]	145	vmm->pgfault_nr = 0;
	146	vmm->u_err_nr = 0;
	147	vmm->m_err_nr = 0;
	148
[124]	149	hal_fence();
[1]	150
[204]	151	vmm_dmsg("\n[INFO] %s : exit for process %x\n", __FUNCTION__ , process->pid );
	152
	153	} // end vmm_init()
	154
[23]	155	//////////////////////////////////////////
	156	error_t vmm_copy( process_t * dst_process,
	157	process_t * src_process )
	158	{
	159	error_t error;
	160
	161	vmm_t * src_vmm = &src_process->vmm;
	162	vmm_t * dst_vmm = &dst_process->vmm;
	163
	164	// take the src_vmm vsegs_lock
	165	rwlock_wr_lock( &src_vmm->vsegs_lock );
	166
[178]	167	// initialize dst_vmm vsegs_lock
[23]	168	rwlock_init( &dst_vmm->vsegs_lock );
	169
[178]	170	// initialize the dst_vmm vsegs list and the radix tree
[23]	171	dst_vmm->vsegs_nr = 0;
	172	list_root_init( &dst_vmm->vsegs_root );
	173	error = grdxt_init( &dst_vmm->grdxt,
	174	CONFIG_VMM_GRDXT_W1,
	175	CONFIG_VMM_GRDXT_W2,
	176	CONFIG_VMM_GRDXT_W3 );
	177	if( error )
	178	{
[178]	179	printk("\n[ERROR] in %s : cannot initialize radix tree for process %x\n",
[23]	180	__FUNCTION__ , dst_process->pid );
	181	return ENOMEM;
	182	}
	183
	184	// loop on src_vmm list of vsegs to create
	185	// and register vsegs copies in dst_vmm
	186	list_entry_t * iter;
	187	vseg_t * src_vseg;
	188	vseg_t * dst_vseg;
	189	LIST_FOREACH( &src_vmm->vsegs_root , iter )
	190	{
	191	// get pointer on current src_vseg
	192	src_vseg = LIST_ELEMENT( iter , vseg_t , list );
	193
	194	// allocate memory for a new dst_vseg
	195	dst_vseg = vseg_alloc();
	196
[178]	197	if( dst_vseg == NULL )
[23]	198	{
	199	// release all allocated vsegs
	200	LIST_FOREACH( &dst_vmm->vsegs_root , iter )
	201	{
	202	dst_vseg = LIST_ELEMENT( iter , vseg_t , list );
	203	vseg_free( dst_vseg );
	204	}
	205	return ENOMEM;
	206	}
	207
	208	// copy src_vseg to dst_vseg
	209	vseg_init_from_ref( dst_vseg , XPTR( local_cxy , src_vseg ) );
	210
	211	// register dst_vseg in dst_vmm
	212	vseg_attach( dst_vmm , dst_vseg );
	213	}
	214
	215	// release the src_vmm vsegs_lock
	216	rwlock_wr_unlock( &src_vmm->vsegs_lock );
	217
	218	// initialize generic page table
	219	error = hal_gpt_create( &dst_vmm->gpt );
	220
	221	if( error )
	222	{
	223	printk("\n[ERROR] in %s : cannot initialize page table\n", __FUNCTION__ );
	224	return ENOMEM;
	225	}
	226
	227	// initialize STACK allocator
	228	dst_vmm->stack_mgr.bitmap = 0;
	229	dst_vmm->stack_mgr.vpn_base = CONFIG_VMM_STACK_BASE;
	230
	231	// initialize MMAP allocator
	232	dst_vmm->mmap_mgr.vpn_base = CONFIG_VMM_MMAP_BASE;
	233	dst_vmm->mmap_mgr.vpn_size = CONFIG_VMM_STACK_BASE - CONFIG_VMM_MMAP_BASE;
	234	dst_vmm->mmap_mgr.first_free_vpn = CONFIG_VMM_MMAP_BASE;
	235	uint32_t i;
	236	for( i = 0 ; i < 32 ; i++ ) list_root_init( &dst_vmm->mmap_mgr.zombi_list[i] );
	237
[178]	238	// initialize instrumentation counters
[23]	239	dst_vmm->pgfault_nr = 0;
	240	dst_vmm->u_err_nr = 0;
	241	dst_vmm->m_err_nr = 0;
	242
	243	// copy base addresses
[178]	244	dst_vmm->kent_vpn_base = src_vmm->kent_vpn_base;
	245	dst_vmm->args_vpn_base = src_vmm->args_vpn_base;
	246	dst_vmm->envs_vpn_base = src_vmm->envs_vpn_base;
	247	dst_vmm->heap_vpn_base = src_vmm->heap_vpn_base;
	248	dst_vmm->code_vpn_base = src_vmm->code_vpn_base;
	249	dst_vmm->data_vpn_base = src_vmm->data_vpn_base;
[23]	250
	251	dst_vmm->entry_point = src_vmm->entry_point;
	252
	253	// HEAP TODO : new heap for child ???
	254	dst_vmm->heap_vseg = src_vmm->heap_vseg;
	255
	256	// initialize generic page table
	257	error = hal_gpt_create( &dst_vmm->gpt );
	258
	259	if( error )
	260	{
	261	printk("\n[ERROR] in %s : cannot initialize page table\n", __FUNCTION__ );
	262	return ENOMEM;
	263	}
	264
	265	// copy GPT content from src_vmm to dst_vmm, activating "Copy-On-Write"
	266	// TODO register Copy-On_Write in page descriptors
	267	bool_t cow = true;
	268	hal_gpt_copy( &dst_vmm->gpt , &src_vmm->gpt , cow );
	269
[124]	270	hal_fence();
[23]	271
	272	return 0;
	273
[204]	274	} // vmm_copy()
	275
[1]	276	///////////////////////////////////////
	277	void vmm_destroy( process_t * process )
	278	{
	279	vseg_t * vseg;
	280
	281	// get pointer on VMM
	282	vmm_t * vmm = &process->vmm;
	283
	284	// get lock protecting vseg list
	285	rwlock_wr_lock( &vmm->vsegs_lock );
	286
	287	// remove all vsegs registered in vmm
	288	while( !list_is_empty( &vmm->vsegs_root ) )
	289	{
	290	vseg = LIST_FIRST( &vmm->vsegs_root , vseg_t , list );
	291	vseg_detach( vmm , vseg );
	292	vseg_free( vseg );
	293	}
	294
	295	// delete vsegs radix_tree
	296	grdxt_destroy( &vmm->grdxt );
	297
	298	// release lock
	299	rwlock_wr_unlock(&vmm->vsegs_lock);
	300
	301	// remove all vsegs from zombi_lists in MMAP allocator
	302	uint32_t i;
	303	for( i = 0 ; i<32 ; i++ )
	304	{
	305	while( !list_is_empty( &vmm->mmap_mgr.zombi_list[i] ) )
	306	{
	307	vseg = LIST_FIRST( &vmm->mmap_mgr.zombi_list[i] , vseg_t , list );
	308	vseg_detach( vmm , vseg );
	309	vseg_free( vseg );
	310	}
	311	}
	312
	313	// release memory allocated to the local page table
	314	hal_gpt_destroy( &vmm->gpt );
	315
[204]	316	} // end vmm_destroy()
	317
[1]	318	/////////////////////////////////////////////////
	319	vseg_t * vmm_check_conflict( process_t * process,
[21]	320	vpn_t vpn_base,
[1]	321	vpn_t vpn_size )
	322	{
	323	vmm_t * vmm = &process->vmm;
	324	vseg_t * vseg;
	325	list_entry_t * iter;
	326
	327	// scan the list of registered vsegs
	328	LIST_FOREACH( &vmm->vsegs_root , iter )
	329	{
	330	vseg = LIST_ELEMENT( iter , vseg_t , list );
[204]	331
[21]	332	if( ((vpn_base + vpn_size) > vseg->vpn_base) &&
	333	(vpn_base < (vseg->vpn_base + vseg->vpn_size)) ) return vseg;
[1]	334	}
	335	return NULL;
	336
[204]	337	} // end vmm_check_conflict()
	338
[1]	339	////////////////////////////////////////////////////////////////////////////////////////////
	340	// This static function is called by the vmm_create_vseg() function, and implements
	341	// the VMM stack_vseg specific allocator.
	342	////////////////////////////////////////////////////////////////////////////////////////////
	343	// @ vmm : pointer on VMM.
[21]	344	// @ vpn_base : (return value) first allocated page
[1]	345	// @ vpn_size : (return value) number of allocated pages
	346	////////////////////////////////////////////////////////////////////////////////////////////
	347	static error_t vmm_stack_alloc( vmm_t * vmm,
	348	vpn_t * vpn_base,
	349	vpn_t * vpn_size )
	350	{
	351	// get stack allocator pointer
	352	stack_mgr_t * mgr = &vmm->stack_mgr;
	353
	354	// get lock on stack allocator
	355	spinlock_lock( &mgr->lock );
	356
	357	// get first free slot index in bitmap
	358	int32_t index = bitmap_ffc( &mgr->bitmap , 4 );
[179]	359	if( (index < 0) \|\| (index > 31) )
	360	{
	361	spinlock_unlock( &mgr->lock );
	362	return ENOMEM;
	363	}
[1]	364
	365	// update bitmap
	366	bitmap_set( &mgr->bitmap , index );
[21]	367
[1]	368	// release lock on stack allocator
	369	spinlock_unlock( &mgr->lock );
	370
[21]	371	// returns vpn_base, vpn_size (one page non allocated)
[1]	372	vpn_base = mgr->vpn_base + index CONFIG_VMM_STACK_SIZE + 1;
	373	*vpn_size = CONFIG_VMM_STACK_SIZE - 1;
	374	return 0;
	375
[204]	376	} // end vmm_stack_alloc()
	377
[1]	378	////////////////////////////////////////////////////////////////////////////////////////////
	379	// This static function is called by the vmm_create_vseg() function, and implements
	380	// the VMM MMAP specific allocator.
	381	////////////////////////////////////////////////////////////////////////////////////////////
	382	// @ vmm : [in] pointer on VMM.
	383	// @ npages : [in] requested number of pages.
[21]	384	// @ vpn_base : [out] first allocated page.
[1]	385	// @ vpn_size : [out] actual number of allocated pages.
	386	////////////////////////////////////////////////////////////////////////////////////////////
	387	static error_t vmm_mmap_alloc( vmm_t * vmm,
	388	vpn_t npages,
	389	vpn_t * vpn_base,
	390	vpn_t * vpn_size )
	391	{
	392	uint32_t index;
	393	vseg_t * vseg;
	394	vpn_t base;
	395	vpn_t size;
[21]	396	vpn_t free;
[1]	397
[21]	398	// mmap vseg size must be power of 2
[1]	399	// compute actual size and index in zombi_list array
	400	size = POW2_ROUNDUP( npages );
	401	index = bits_log2( size );
	402
	403	// get mmap allocator pointer
	404	mmap_mgr_t * mgr = &vmm->mmap_mgr;
	405
	406	// get lock on mmap allocator
	407	spinlock_lock( &mgr->lock );
	408
	409	// get vseg from zombi_list or from mmap zone
	410	if( list_is_empty( &mgr->zombi_list[index] ) ) // from mmap zone
	411	{
	412	// check overflow
	413	free = mgr->first_free_vpn;
	414	if( (free + size) > mgr->vpn_size ) return ENOMEM;
	415
	416	// update STACK allocator
	417	mgr->first_free_vpn += size;
	418
	419	// compute base
	420	base = free;
	421	}
	422	else // from zombi_list
	423	{
	424	// get pointer on zombi vseg from zombi_list
	425	vseg = LIST_FIRST( &mgr->zombi_list[index] , vseg_t , list );
	426
	427	// remove vseg from free-list
	428	list_unlink( &vseg->list );
	429
	430	// compute base
	431	base = vseg->vpn_base;
[21]	432	}
	433
[1]	434	// release lock on mmap allocator
	435	spinlock_unlock( &mgr->lock );
	436
	437	// returns vpn_base, vpn_size
	438	*vpn_base = base;
	439	*vpn_size = size;
	440	return 0;
	441
[204]	442	} // end vmm_mmap_alloc()
	443
[1]	444	//////////////////////////////////////////////
	445	vseg_t * vmm_create_vseg( process_t * process,
[21]	446	intptr_t base,
	447	intptr_t size,
[1]	448	uint32_t type )
	449	{
	450	vseg_t * vseg; // created vseg pointer
[204]	451	vpn_t vpn_base; // first page index
[1]	452	vpn_t vpn_size; // number of pages
	453	error_t error;
	454
	455	// get pointer on VMM
	456	vmm_t * vmm = &process->vmm;
[21]	457
[204]	458	vmm_dmsg("\n[INFO] %s : enter for process %x / base = %x / size = %x / type = %s\n",
[101]	459	__FUNCTION__ , process->pid , base , size , vseg_type_str(type) );
[21]	460
[204]	461	// compute base, size, vpn_base, vpn_size, depending on vseg type
[1]	462	// we use the VMM specific allocators for STACK and MMAP vsegs
	463	if( type == VSEG_TYPE_STACK )
	464	{
	465	// get vpn_base and vpn_size from STACK allocator
	466	error = vmm_stack_alloc( vmm , &vpn_base , &vpn_size );
	467	if( error )
	468	{
	469	printk("\n[ERROR] in %s : no vspace for stack vseg / process %x in cluster %x\n",
	470	__FUNCTION__ , process->pid , local_cxy );
	471	return NULL;
	472	}
	473
	474	// compute vseg base and size from vpn_base and vpn_size
	475	base = vpn_base << CONFIG_PPM_PAGE_SHIFT;
	476	size = vpn_size << CONFIG_PPM_PAGE_SHIFT;
	477	}
[21]	478	else if( (type == VSEG_TYPE_ANON) \|\|
	479	(type == VSEG_TYPE_FILE) \|\|
[1]	480	(type == VSEG_TYPE_REMOTE) )
	481	{
	482	// get vpn_base and vpn_size from MMAP allocator
	483	vpn_t npages = size >> CONFIG_PPM_PAGE_SHIFT;
	484	error = vmm_mmap_alloc( vmm , npages , &vpn_base , &vpn_size );
	485	if( error )
	486	{
	487	printk("\n[ERROR] in %s : no vspace for mmap vseg / process %x in cluster %x\n",
	488	__FUNCTION__ , process->pid , local_cxy );
	489	return NULL;
	490	}
	491
	492	// compute vseg base and size from vpn_base and vpn_size
	493	base = vpn_base << CONFIG_PPM_PAGE_SHIFT;
	494	size = vpn_size << CONFIG_PPM_PAGE_SHIFT;
	495	}
	496	else
	497	{
[204]	498	uint32_t vpn_min = base >> CONFIG_PPM_PAGE_SHIFT;
	499	uint32_t vpn_max = (base + size - 1) >> CONFIG_PPM_PAGE_SHIFT;
	500
	501	vpn_base = vpn_min;
	502	vpn_size = vpn_max - vpn_min + 1;
[1]	503	}
	504
	505	// check collisions
	506	vseg = vmm_check_conflict( process , vpn_base , vpn_size );
	507	if( vseg != NULL )
	508	{
[21]	509	printk("\n[ERROR] in %s for process %x : new vseg [vpn_base = %x / vpn_size = %x]\n"
[1]	510	" overlap existing vseg [vpn_base = %x / vpn_size = %x]\n",
[21]	511	__FUNCTION__ , process->pid, vpn_base, vpn_size,
	512	vseg->vpn_base, vseg->vpn_size );
[1]	513	return NULL;
	514	}
	515
	516	// allocate physical memory for vseg descriptor
	517	vseg = vseg_alloc();
	518	if( vseg == NULL )
	519	{
	520	printk("\n[ERROR] in %s for process %x : cannot allocate memory for vseg\n",
	521	__FUNCTION__ , process->pid );
	522	return NULL;
	523	}
	524
	525	// initialize vseg descriptor
[315]	526	vseg_init( vseg , base, size , vpn_base , vpn_size , type , local_cxy );
[1]	527
	528	// update "heap_vseg" in VMM
	529	process->vmm.heap_vseg = vseg;
	530
	531	// attach vseg to vmm
	532	rwlock_wr_lock( &vmm->vsegs_lock );
	533	vseg_attach( vmm , vseg );
	534	rwlock_wr_unlock( &vmm->vsegs_lock );
	535
[204]	536	vmm_dmsg("\n[INFO] %s : exit for process %x / vseg [%x, %x] has been mapped\n",
[1]	537	__FUNCTION__ , process->pid , vseg->min , vseg->max );
[21]	538
[1]	539	return vseg;
[178]	540	}
[1]	541
	542	/////////////////////////////////////
	543	void vmm_remove_vseg( vseg_t * vseg )
	544	{
	545	// get pointers on calling process and VMM
	546	thread_t * this = CURRENT_THREAD;
	547	process_t * process = this->process;
	548	vmm_t * vmm = &this->process->vmm;
	549	uint32_t type = vseg->type;
	550
	551	// detach vseg from VMM
	552	rwlock_wr_lock( &vmm->vsegs_lock );
	553	vseg_detach( &process->vmm , vseg );
	554	rwlock_wr_unlock( &vmm->vsegs_lock );
	555
	556	// release the stack slot to VMM stack allocator if STACK type
	557	if( type == VSEG_TYPE_STACK )
	558	{
	559	// get pointer on stack allocator
	560	stack_mgr_t * mgr = &vmm->stack_mgr;
	561
	562	// compute slot index
	563	uint32_t index = ((vseg->vpn_base - mgr->vpn_base - 1) / CONFIG_VMM_STACK_SIZE);
	564
	565	// update stacks_bitmap
	566	spinlock_lock( &mgr->lock );
	567	bitmap_clear( &mgr->bitmap , index );
	568	spinlock_unlock( &mgr->lock );
	569	}
	570
	571	// release the vseg to VMM mmap allocator if MMAP type
	572	if( (type == VSEG_TYPE_ANON) \|\| (type == VSEG_TYPE_FILE) \|\| (type == VSEG_TYPE_REMOTE) )
	573	{
	574	// get pointer on mmap allocator
	575	mmap_mgr_t * mgr = &vmm->mmap_mgr;
	576
	577	// compute zombi_list index
	578	uint32_t index = bits_log2( vseg->vpn_size );
	579
	580	// update zombi_list
	581	spinlock_lock( &mgr->lock );
	582	list_add_first( &mgr->zombi_list[index] , &vseg->list );
	583	spinlock_unlock( &mgr->lock );
	584	}
	585
	586	// release physical memory allocated for vseg descriptor if no MMAP type
	587	if( (type != VSEG_TYPE_ANON) && (type != VSEG_TYPE_FILE) && (type != VSEG_TYPE_REMOTE) )
	588	{
	589	vseg_free( vseg );
	590	}
[178]	591	}
[1]	592
[68]	593	//////////////////////////////////////////////
	594	error_t vmm_map_kernel_vseg( vseg_t * vseg,
	595	uint32_t attr )
[1]	596	{
	597	vpn_t vpn; // VPN of PTE to be set
	598	vpn_t vpn_min; // VPN of first PTE to be set
	599	vpn_t vpn_max; // VPN of last PTE to be set (excluded)
	600	ppn_t ppn; // PPN of allocated physical page
	601	uint32_t order; // ln( number of small pages for one single PTE )
	602	page_t * page;
	603	error_t error;
	604
[68]	605	// check vseg type : must be a kernel vseg
[1]	606	uint32_t type = vseg->type;
[68]	607	assert( ((type==VSEG_TYPE_KCODE) \|\| (type==VSEG_TYPE_KDATA) \|\| (type==VSEG_TYPE_KDEV)),
	608	__FUNCTION__ , "not a kernel vseg\n" );
[1]	609
	610	// get pointer on page table
	611	gpt_t * gpt = &process_zero.vmm.gpt;
	612
[21]	613	// define number of small pages per PTE
[1]	614	if( attr & GPT_SMALL ) order = 0; // 1 small page
	615	else order = 9; // 512 small pages
	616
	617	// loop on pages in vseg
	618	vpn_min = vseg->vpn_base;
	619	vpn_max = vpn_min + vseg->vpn_size;
	620	for( vpn = vpn_min ; vpn < vpn_max ; vpn++ )
	621	{
[68]	622	// allocate a physical page from local PPM
[1]	623	kmem_req_t req;
	624	req.type = KMEM_PAGE;
	625	req.size = order;
	626	req.flags = AF_KERNEL \| AF_ZERO;
	627	page = (page_t *)kmem_alloc( &req );
[21]	628	if( page == NULL )
[1]	629	{
	630	printk("\n[ERROR] in %s : cannot allocate physical memory\n", __FUNCTION__ );
	631	return ENOMEM;
	632	}
	633
	634	// set page table entry
[315]	635	ppn = ppm_page2ppn( XPTR( local_cxy , page ) );
[1]	636	error = hal_gpt_set_pte( gpt , vpn , ppn , attr );
[21]	637	if( error )
[1]	638	{
	639	printk("\n[ERROR] in %s : cannot register PPE\n", __FUNCTION__ );
	640	return ENOMEM;
	641	}
	642	}
[21]	643
[1]	644	return 0;
[178]	645	}
[1]	646
	647	/////////////////////////////////////////
	648	void vmm_unmap_vseg( process_t * process,
	649	vseg_t * vseg )
	650	{
[21]	651	vpn_t vpn; // VPN of current PTE
	652	vpn_t vpn_min; // VPN of first PTE
[1]	653	vpn_t vpn_max; // VPN of last PTE (excluded)
	654
	655	// get pointer on process page table
	656	gpt_t * gpt = &process->vmm.gpt;
	657
	658	// loop on pages in vseg
	659	vpn_min = vseg->vpn_base;
	660	vpn_max = vpn_min + vseg->vpn_size;
	661	for( vpn = vpn_min ; vpn < vpn_max ; vpn++ )
	662	{
	663	hal_gpt_reset_pte( gpt , vpn );
	664	}
[178]	665	}
[1]	666
	667	/////////////////////////////////////////////
	668	error_t vmm_resize_vseg( process_t * process,
	669	intptr_t base,
	670	intptr_t size )
	671	{
	672	error_t error;
	673
	674	// get pointer on process VMM
	675	vmm_t * vmm = &process->vmm;
	676
	677	intptr_t addr_min = base;
	678	intptr_t addr_max = base + size;
[21]	679	uint32_t shift = CONFIG_PPM_PAGE_SHIFT;
[1]	680
	681	// get pointer on vseg
	682	vseg_t * vseg = grdxt_lookup( &vmm->grdxt , (uint32_t)(base >> shift) );
	683
	684	if( vseg == NULL) return EINVAL;
[21]	685
[1]	686	// get VMM lock protecting vsegs list
	687	rwlock_wr_lock( &vmm->vsegs_lock );
[21]	688
[1]	689	if( (vseg->min > addr_min) \|\| (vseg->max < addr_max) ) // region not included in vseg
	690	{
	691	error = EINVAL;
	692	}
	693	else if( (vseg->min == addr_min) && (vseg->max == addr_max) ) // vseg must be removed
	694	{
	695	vmm_remove_vseg( vseg );
	696	error = 0;
	697	}
	698	else if( vseg->min == addr_min ) // vseg must be resized
	699	{
	700	printk("\n[PANIC] in %s : resize not implemented yet\n", __FUNCTION__ );
	701	hal_core_sleep();
	702	error = 0;
	703	}
	704	else if( vseg->max == addr_max ) // vseg must be resized
	705	{
	706	printk("\n[PANIC] in %s : resize not implemented yet\n", __FUNCTION__ );
	707	hal_core_sleep();
	708	error = 0;
	709	}
	710	else // vseg cut in three regions => vseg must be resized & new vseg created
	711	{
	712	printk("\n[PANIC] in %s : resize not implemented yet\n", __FUNCTION__ );
	713	hal_core_sleep();
	714	error = 0;
	715	}
	716
	717	// release VMM lock
	718	rwlock_wr_unlock( &vmm->vsegs_lock );
	719
	720	return error;
[178]	721	}
[1]	722
	723	///////////////////////////////////////////
	724	vseg_t * vmm_get_vseg( process_t * process,
	725	intptr_t vaddr )
	726	{
	727
	728	// get pointer on process VMM
	729	vmm_t * vmm = &process->vmm;
	730
	731	// get lock protecting the vseg list
	732	rwlock_rd_lock( &vmm->vsegs_lock );
	733
	734	// get pointer on vseg from radix tree
	735	vseg_t * vseg = grdxt_lookup( &vmm->grdxt, (uint32_t)(vaddr >> CONFIG_PPM_PAGE_SHIFT) );
	736
	737	// release the lock
	738	rwlock_rd_unlock( &vmm->vsegs_lock );
	739
	740	return vseg;
[178]	741	}
[1]	742
[313]	743	////////////////////////////////////////
	744	error_t vmm_get_one_ppn( vseg_t * vseg,
	745	vpn_t vpn,
	746	ppn_t * ppn )
	747	{
	748	error_t error;
	749	cxy_t page_cxy; // physical page cluster
	750	page_t * page_ptr; // local pointer on physical page descriptor
	751
	752	uint32_t type = vseg->type;
	753	xptr_t mapper_xp = vseg->mapper_xp;
[315]	754	uint32_t flags = vseg->flags;
[313]	755
	756	// get mapper cluster and local pointer
	757	cxy_t mapper_cxy = GET_CXY( mapper_xp );
	758	mapper_t * mapper_ptr = (mapper_t *)GET_PTR( mapper_xp );
	759
	760	// FILE type : simply get the physical page from the file mapper
	761	if( type == VSEG_TYPE_FILE )
	762	{
	763	// compute index in file mapper
	764	uint32_t index = vpn - vseg->vpn_base;
	765
	766	// get page descriptor from mapper
	767	if( mapper_cxy == local_cxy ) // mapper is local
	768	{
	769	page_ptr = mapper_get_page( mapper_ptr , index );
	770	}
	771	else // mapper is remote
	772	{
	773	rpc_mapper_get_page_client( mapper_cxy , mapper_ptr , index , &page_ptr );
	774	}
	775
	776	if ( page_ptr == NULL ) return EINVAL;
	777
	778	page_cxy = mapper_cxy;
	779	}
	780
	781	// all other types : allocate a physical page from target cluster,
	782	else
	783	{
	784	// get target cluster for physical page
	785	if( flags & VSEG_DISTRIB ) // depends on VPN LSB
	786	{
	787	uint32_t x_width = LOCAL_CLUSTER->x_width;
	788	uint32_t y_width = LOCAL_CLUSTER->y_width;
	789	page_cxy = vpn & ((1<<(x_width + y_width)) - 1);
	790	}
	791	else // defined in vseg descriptor
	792	{
	793	page_cxy = vseg->cxy;
	794	}
	795
	796	// allocate a physical page in target cluster
	797	kmem_req_t req;
	798	if( page_cxy == local_cxy ) // target cluster is the local cluster
	799	{
	800	req.type = KMEM_PAGE;
	801	req.size = 0;
	802	req.flags = AF_NONE;
	803	page_ptr = (page_t *)kmem_alloc( &req );
	804	}
	805	else // target cluster is not the local cluster
	806	{
	807	rpc_pmem_get_pages_client( page_cxy , 0 , &page_ptr );
	808	}
	809
	810	if( page_ptr == NULL ) return ENOMEM;
	811
	812	// initialise page from .elf file mapper for DATA and CODE types
	813	if( (type == VSEG_TYPE_CODE) \|\| (type == VSEG_TYPE_DATA) )
	814	{
	815	// compute missing page index in vseg
	816	vpn_t page_index = vpn - vseg->vpn_base;
	817
	818	// compute missing page offset in .elf file
[315]	819	intptr_t page_offset = vseg->file_offset +
	820	(page_index << CONFIG_PPM_PAGE_SHIFT);
[313]	821
[315]	822	// compute extended pointer on page first byte
	823	xptr_t base_xp = ppm_page2base( XPTR( page_cxy , page_ptr ) );
[313]	824
	825	// file_size can be smaller than vseg_size for BSS
[315]	826	intptr_t file_size = vseg->file_size;
[313]	827
[315]	828	if( file_size < page_offset ) // fully in BSS
[313]	829	{
	830	if( page_cxy == local_cxy )
	831	{
[315]	832	memset( GET_PTR( base_xp ) , 0 , CONFIG_PPM_PAGE_SIZE );
[313]	833	}
	834	else
	835	{
[315]	836	hal_remote_memset( base_xp , 0 , CONFIG_PPM_PAGE_SIZE );
[313]	837	}
	838	}
[315]	839	else if( file_size >= (page_offset + CONFIG_PPM_PAGE_SIZE) ) // fully in mapper
	840	{
[313]	841	if( mapper_cxy == local_cxy )
	842	{
	843	error = mapper_move_kernel( mapper_ptr,
	844	true, // to_buffer
	845	page_offset,
	846	base_xp,
[315]	847	CONFIG_PPM_PAGE_SIZE );
[313]	848	}
	849	else
	850	{
	851	rpc_mapper_move_buffer_client( mapper_cxy,
	852	mapper_ptr,
	853	true, // to buffer
	854	false, // kernel buffer
	855	page_offset,
	856	(uint64_t)base_xp,
[315]	857	CONFIG_PPM_PAGE_SIZE,
[313]	858	&error );
	859	}
	860	if( error ) return EINVAL;
	861	}
	862	else // in mapper : from page_offset -> (file_size - page_offset)
	863	// in BSS : from file_size -> (page_offset + page_size)
	864	{
	865	// initialize mapper part
[315]	866	if( mapper_cxy == local_cxy )
[313]	867	{
	868	error = mapper_move_kernel( mapper_ptr,
[315]	869	true, // to buffer
[313]	870	page_offset,
	871	base_xp,
	872	file_size - page_offset );
	873	}
[315]	874	else
[313]	875	{
	876	rpc_mapper_move_buffer_client( mapper_cxy,
	877	mapper_ptr,
[315]	878	true, // to buffer
[313]	879	false, // kernel buffer
	880	page_offset,
	881	(uint64_t)base_xp,
	882	file_size - page_offset,
	883	&error );
	884	}
	885	if( error ) return EINVAL;
	886
	887	// initialize BSS part
	888	if( page_cxy == local_cxy )
	889	{
[315]	890	memset( GET_PTR( base_xp ) + file_size - page_offset , 0 ,
	891	page_offset + CONFIG_PPM_PAGE_SIZE - file_size );
[313]	892	}
	893	else
	894	{
	895	hal_remote_memset( base_xp + file_size - page_offset , 0 ,
[315]	896	page_offset + CONFIG_PPM_PAGE_SIZE - file_size );
[313]	897	}
	898	}
	899	} // end initialisation for CODE or DATA types
	900	}
	901
	902	// return ppn
[315]	903	*ppn = ppm_page2ppn( XPTR( page_cxy , page_ptr ) );
[313]	904	return 0;
	905
	906	} // end vmm_get_one_ppn()
	907
[1]	908	/////////////////////////////////////////
	909	error_t vmm_get_pte( process_t * process,
	910	vpn_t vpn,
	911	uint32_t * ret_attr,
	912	ppn_t * ret_ppn )
	913	{
	914	vseg_t * vseg; // pointer on vseg containing VPN
[313]	915	ppn_t ppn; // physical page number
[1]	916	uint32_t attr; // attributes from GPT entry
	917	error_t error;
	918
[178]	919	// this function must be called by a thread running in the reference cluster
[68]	920	assert( (GET_CXY( process->ref_xp ) == local_cxy ) , __FUNCTION__ ,
	921	" not called in the reference cluster\n" );
[1]	922
	923	// get VMM pointer
	924	vmm_t * vmm = &process->vmm;
	925
	926	// access GPT to get PTE attributes and PPN
	927	hal_gpt_get_pte( &vmm->gpt , vpn , &attr , &ppn );
	928
[313]	929	// if PTE is unmapped
	930	// 1) get VSEG containing the missing VPN
	931	// 2) get & initialize physical page (depending on vseg type),
	932	// 3) register the PTE in reference GPT
[21]	933	if( (attr & GPT_MAPPED) == 0 )
[1]	934	{
[313]	935	// 1. get vseg pointer
[1]	936	vseg = vmm_get_vseg( process , vpn<<CONFIG_PPM_PAGE_SHIFT );
	937
[286]	938	if( vseg == NULL )
[1]	939	{
	940	printk("\n[ERROR] in %s : out of segment / process = %x / vpn = %x\n",
	941	__FUNCTION__ , process->pid , vpn );
	942	return EINVAL;
	943	}
	944
[313]	945	// 2. get physical page number, depending on vseg type
	946	error = vmm_get_one_ppn( vseg , vpn , &ppn );
[1]	947
	948	if( error )
	949	{
	950	printk("\n[ERROR] in %s : cannot allocate memory / process = %x / vpn = %x\n",
	951	__FUNCTION__ , process->pid , vpn );
[313]	952	return error;
[1]	953	}
	954
[313]	955	// 3. define attributes from vseg flags and register in GPT
[1]	956	attr = GPT_MAPPED \| GPT_SMALL;
	957	if( vseg->flags & VSEG_USER ) attr \|= GPT_USER;
	958	if( vseg->flags & VSEG_WRITE ) attr \|= GPT_WRITABLE;
	959	if( vseg->flags & VSEG_EXEC ) attr \|= GPT_EXECUTABLE;
	960	if( vseg->flags & VSEG_CACHE ) attr \|= GPT_CACHABLE;
	961
	962	error = hal_gpt_set_pte( &vmm->gpt , vpn , ppn , attr );
[313]	963
[1]	964	if( error )
	965	{
	966	printk("\n[ERROR] in %s : cannot register PTE / process = %x / vpn = %x\n",
	967	__FUNCTION__ , process->pid , vpn );
	968	return ENOMEM;
	969	}
[313]	970	} // end new PTE
[1]	971
	972	*ret_ppn = ppn;
[21]	973	*ret_attr = attr;
[1]	974	return 0;
	975
[313]	976	} // end vmm_get_pte()
	977
[1]	978	///////////////////////////////////////////////////
	979	error_t vmm_handle_page_fault( process_t * process,
	980	vseg_t * vseg,
	981	vpn_t vpn )
	982	{
	983	uint32_t attr; // missing page attributes
[21]	984	ppn_t ppn; // missing page PPN
[1]	985	error_t error; // return value
	986
	987	// get local VMM pointer
	988	vmm_t * vmm = &process->vmm;
	989
	990	// get reference process cluster and local pointer
	991	cxy_t ref_cxy = GET_CXY( process->ref_xp );
	992	process_t * ref_ptr = (process_t *)GET_PTR( process->ref_xp );
	993
[313]	994	// get missing PTE attributes and PPN from reference cluster
[1]	995	if( local_cxy != ref_cxy ) // local cluster is not the reference cluster
	996	{
	997	rpc_vmm_get_pte_client( ref_cxy , ref_ptr , vpn , &attr , &ppn , &error );
	998	}
[21]	999	else // local cluster is the reference cluster
[1]	1000	{
	1001	error = vmm_get_pte( process , vpn , &attr , &ppn );
	1002	}
	1003
	1004	// check page allocation error
	1005	if( error )
	1006	{
	1007	printk("\n[ERROR] in %s : cannot allocate memory / process = %x / vpn = %x\n",
[21]	1008	__FUNCTION__ , process->pid , vpn );
[1]	1009	return ENOMEM;
	1010	}
	1011
	1012	// set the missing PTE in local VMM
	1013	error = hal_gpt_set_pte( &vmm->gpt , vpn , attr , ppn );
	1014	if( error )
	1015	{
	1016	printk("\n[ERROR] in %s : cannot register PTE / process = %x / vpn = %x\n",
[21]	1017	__FUNCTION__ , process->pid , vpn );
[1]	1018	return ENOMEM;
	1019	}
[21]	1020
[1]	1021	return 0;
	1022
[313]	1023	} // end vmm_handle_page_fault()
	1024
	1025
[1]	1026	///////////////////////////////////////////
	1027	error_t vmm_v2p_translate( bool_t ident,
	1028	void * ptr,
	1029	paddr_t * paddr )
	1030	{
[23]	1031	process_t * process = CURRENT_THREAD->process;
[1]	1032
	1033	if( ident ) // identity mapping
	1034	{
[23]	1035	*paddr = (paddr_t)PADDR( local_cxy , (lpa_t)ptr );
[1]	1036	return 0;
	1037	}
	1038
[21]	1039	// access page table
[1]	1040	error_t error;
	1041	vpn_t vpn;
	1042	uint32_t attr;
	1043	ppn_t ppn;
	1044	uint32_t offset;
	1045
[23]	1046	vpn = (vpn_t)( (intptr_t)ptr >> CONFIG_PPM_PAGE_SHIFT );
	1047	offset = (uint32_t)( ((intptr_t)ptr) & CONFIG_PPM_PAGE_MASK );
[1]	1048
[50]	1049	if( local_cxy == GET_CXY( process->ref_xp) ) // calling process is reference process
[1]	1050	{
	1051	error = vmm_get_pte( process, vpn , &attr , &ppn );
	1052	}
[50]	1053	else // calling process is not reference process
[1]	1054	{
	1055	cxy_t ref_cxy = GET_CXY( process->ref_xp );
	1056	process_t * ref_ptr = (process_t *)GET_PTR( process->ref_xp );
	1057	rpc_vmm_get_pte_client( ref_cxy , ref_ptr , vpn , &attr , &ppn , &error );
	1058	}
	1059
[23]	1060	// set paddr
[1]	1061	*paddr = (((paddr_t)ppn) << CONFIG_PPM_PAGE_SHIFT) \| offset;
[21]	1062
[23]	1063	return error;
[313]	1064
[315]	1065	} // end vmm_v2p_translate()
[1]	1066
[315]	1067	/* deprecated
	1068
[1]	1069	///////////////////////////////////////////////////////////////////
	1070	///////////////////////////////////////////////////////////////////
	1071	error_t vmm_inval_shared_page( vseg_t *vseg, vma_t vaddr, ppn_t ppn)
	1072	{
	1073	pmm_page_info_t current;
	1074	error_t err;
	1075
	1076	error= pmm_get_page(&vseg->vmm->pmm, vaddr, &current);
	1077
	1078	if((err) \|\| (current.ppn != ppn))
	1079	goto ended;
	1080
	1081	current.ppn = 0;
	1082	current.attr = 0;
	1083	current.cluster = NULL;
	1084
	1085	error= pmm_set_page(&vseg->vmm->pmm, vaddr, &current);
	1086
	1087	ended:
	1088	return err;
	1089	}
	1090
	1091	error_t vmm_update_shared_page( vseg_t *vseg, vma_t vaddr, ppn_t ppn)
	1092	{
	1093	pmm_page_info_t current;
	1094	error_t err;
	1095
	1096	error= pmm_get_page(&vseg->vmm->pmm, vaddr, &current);
	1097
	1098	if((err) \|\| (current.attr != 0))
	1099	goto ended;
	1100
	1101	current.ppn = ppn;
	1102	current.attr = vseg->vm_pgprot;
[178]	1103	current.cluster = NULL; // this function is called after invalidate one
[1]	1104
	1105	error= pmm_set_page(&vseg->vmm->pmm, vaddr , &current);
	1106
	1107	ended:
	1108	return err;
	1109	}
	1110
[178]	1111	// Hypothesis: the vseg is shared-anon, mapper list is rdlocked, page is locked
[1]	1112	error_t vmm_migrate_shared_page_seq( vseg_t vseg, struct page_s page, struct page_s **new)
	1113	{
	1114	register vseg_t *reg;
	1115	register struct process_s *process;
	1116	register struct process_s *this_process;
	1117	struct page_s *new_pg;
	1118	struct list_entry *iter;
	1119	kmem_req_t req;
	1120	vma_t vaddr;
	1121	ppn_t ppn;
	1122	error_t err;
	1123
	1124	vaddr = (page->index << PMM_PAGE_SHIFT) + vseg->vm_start + vseg->vm_offset;
	1125	ppn = ppm_page2ppn(page);
	1126	this_process = (new == NULL) ? NULL : current_process;
	1127	iter = &vseg->vm_shared_list;
	1128	error = ECANCELED;
	1129
[178]	1130	// Invalidate All
[1]	1131	do
	1132	{
	1133	reg = list_element(iter, vseg_t, vm_shared_list);
	1134
	1135	process = vmm_get_process(reg->vmm);
	1136
	1137	if(process != this_process)
	1138	{
	1139	error= vmm_inval_shared_page(reg, vaddr, ppn);
	1140
	1141	if(err) goto fail_inval;
	1142	}
	1143
	1144	assert(vseg->vm_mapper.m_home_cid == current_cid);
	1145	iter = list_next(&vseg->vm_mapper.m_reg_root, iter);
	1146
	1147	}while(iter != NULL);
	1148
	1149	req.type = KMEM_PAGE;
	1150	req.size = 0;
	1151	req.excep_code = AF_USER;
	1152
	1153	new_pg = kmem_alloc(&req);
	1154	*new = new_pg;
	1155
	1156	if(new_pg == NULL)
	1157	{
	1158	error= ENOMEM;
	1159	goto fail_alloc;
	1160	}
	1161
	1162	page_copy(new_pg, page);
	1163
	1164	page_lock(new_pg);
	1165
	1166	new_pg->mapper = page->mapper;
	1167	new_pg->index = page->index;
	1168
[178]	1169	// TODO: do the complet job regading dirty page
[1]	1170	if(PAGE_IS(page, PG_DIRTY))
	1171	PAGE_SET(new_pg, PG_DIRTY);
	1172
	1173	ppn = ppm_page2ppn(new_pg);
	1174	iter = &vseg->vm_shared_list;
	1175
	1176	// Update All
	1177	do
	1178	{
	1179	reg = list_element(iter, vseg_t, vm_shared_list);
	1180
	1181	process = vmm_get_process(reg->vmm);
	1182
	1183	if(process != this_process)
	1184	(void) vmm_update_shared_page(reg, vaddr, ppn);
	1185
	1186	assert(vseg->vm_mapper.m_home_cid == current_cid);
	1187	iter = list_next(&vseg->vm_mapper.m_reg_root, iter);
	1188
	1189
	1190	}while(iter != NULL);
	1191
	1192	page_unlock(new_pg);
	1193
	1194	fail_alloc:
	1195	fail_inval:
	1196	return err;
	1197	}
	1198
	1199	//TODO: revisit all manipulation of the page->refcount
	1200	///////////////////////////////////////////////////////////////
[178]	1201	static inline error_t vmm_do_migrate( vseg_t * vseg,
[1]	1202	pmm_page_info_t * pinfo,
	1203	uint32_t vaddr )
	1204	{
	1205	kmem_req_t req;
	1206	pmm_page_info_t current;
	1207	page_t * newpage;
	1208	cluster_t * cluster;
	1209	thread_t * this;
	1210	error_t err;
	1211	ppn_t ppn;
[178]	1212
[1]	1213	assert( pinfo->ppn != 0 );
	1214
	1215	ppn = pinfo->ppn;
	1216	this = current_thread;
	1217	newpage = NULL;
	1218	cluster = current_cluster;
[178]	1219
[1]	1220	current.attr = 0;
	1221	current.ppn = 0;
	1222
	1223	error= pmm_lock_page(&vseg->vmm->pmm, vaddr, &current);
	1224
[178]	1225	if(error\|\| (current.isAtomic == false) \|\|
[1]	1226	(current.ppn != ppn) \|\| !(current.attr & PMM_MIGRATE))
	1227	{
	1228	#if CONFIG_SHOW_SPURIOUS_PGFAULT
[178]	1229	printk(INFO, "%s: pid %d, tid %d, cpu %d, nothing to do for vaddr %x\n",
	1230	__FUNCTION__,
	1231	this->process->pid,
	1232	this->info.order,
[1]	1233	cpu_get_id(),
	1234	vaddr);
	1235	#endif
	1236	this->info.spurious_pgfault_cntr ++;
	1237	pmm_unlock_page(&vseg->vmm->pmm, vaddr, &current);
	1238	pmm_tlb_flush_vaddr(vaddr, PMM_DATA);
	1239	return 0;
	1240	}
[178]	1241
[1]	1242	if(!ppn_is_local(ppn))
	1243	{
	1244	req.type = KMEM_PAGE;
	1245	req.size = 0;
	1246	req.excep_code = AF_PGFAULT;
	1247
	1248	newpage = kmem_alloc(&req);
	1249
	1250	if(newpage)
	1251	{
	1252	newpage->mapper = NULL;//?
	1253	ppn_copy(ppm_page2ppn(newpage), ppn);
	1254
	1255	if(current.attr & PMM_COW)
	1256	{
	1257	current.attr \|= PMM_WRITE;
	1258	current.attr &= ~(PMM_COW);
	1259	}
	1260
	1261	current.ppn = ppm_page2ppn(newpage);
	1262	}
	1263	}
	1264
	1265	current.attr \|= PMM_PRESENT;
	1266	current.attr &= ~(PMM_MIGRATE);
	1267	current.attr &= ~(PMM_LOCKED);
	1268	current.cluster = NULL;
	1269
	1270	//also unlock the table entry
	1271	error= pmm_set_page(&vseg->vmm->pmm, vaddr, &current);
	1272
	1273	if(err)
	1274	{
[178]	1275	// TODO: we should differ the kmem_free call
[1]	1276	//page_unlock(page);
	1277	(void)pmm_unlock_page(&vseg->vmm->pmm, vaddr, &current);
	1278	req.ptr = newpage;
	1279	kmem_free(&req);
	1280	return err;
[178]	1281	}
[1]	1282
	1283
	1284	if(newpage)
	1285	{
	1286	ppn_refcount_down(ppn);
	1287	current_thread->info.remote_pages_cntr ++;
[178]	1288	#if CONFIG_SHOW_REMOTE_PGALLOC
[1]	1289	printk(INFO, "%s: pid %d, tid %x, cpu %d, cid %d: got new remote page from cluster %d (vaddr %x)\n",
	1290	__FUNCTION__,
	1291	current_process->pid,
	1292	current_thread,
	1293	cpu_get_id(),
	1294	cluster->id,
	1295	newpage->cid,
	1296	vaddr);
	1297	#endif
	1298	}
	1299
	1300	#if CONFIG_SHOW_VMMMGRT_MSG
	1301	printk(INFO, "%s: pid %d, tid %d, cpu %d: Asked to migrate page (vaddr %x) from cluster %d to cluster %d, error%d\n",
	1302	__FUNCTION__,
	1303	current_process->pid,
	1304	current_thread->info.order,
	1305	cpu_get_id(),
	1306	vaddr,
	1307	ppn_ppn2cid(ppn),
	1308	cluster->id,
	1309	err);
	1310	#endif
	1311
	1312	return err;
	1313	}
	1314
	1315	error_t vmm_do_cow( vseg_t vseg, pmm_page_info_t pinfo, uint32_t vaddr)
	1316	{
	1317	register struct page_s *newpage;
	1318	register struct page_s *page;
	1319	register struct thread_s *this;
	1320	register error_t err;
	1321	register uint32_t count;
	1322	register bool_t isCountDown;
	1323	pmm_page_info_t old;
	1324	pmm_page_info_t new;
	1325	kmem_req_t req;
	1326
	1327	this = current_thread;
	1328	old.attr = 0;
	1329	newpage = NULL;
	1330	isCountDown = true;
	1331
	1332	vmm_dmsg(2,"%s: pid %d, tid %d, cpu %d, vaddr %x\n",
	1333	__FUNCTION__,
	1334	this->process->pid,
	1335	this->info.order,
	1336	cpu_get_id(),
	1337	vaddr);
	1338
[178]	1339
[1]	1340	error= pmm_lock_page(&vseg->vmm->pmm, vaddr, &old);
	1341
	1342	//TODO: check this condition
	1343	if(error\|\| (old.isAtomic == false) \|\| !(old.attr & PMM_COW))
	1344	{
	1345	#if CONFIG_SHOW_SPURIOUS_PGFAULT
[178]	1346	printk(INFO, "%s: pid %d, tid %d, cpu %d, nothing to do for vaddr %x\n",
	1347	__FUNCTION__,
	1348	this->process->pid,
	1349	this->info.order,
[1]	1350	cpu_get_id(),
	1351	vaddr);
	1352	#endif
	1353	this->info.spurious_pgfault_cntr ++;
	1354	pmm_tlb_flush_vaddr(vaddr, PMM_DATA);
	1355	pmm_unlock_page(&vseg->vmm->pmm, vaddr, &old);
	1356	return err;
	1357	//goto VMM_COW_END;
	1358	}
	1359
[178]	1360	//if the ppn is local and the others (processus with wich we share the page)
[1]	1361	//has done cow, then use the old.ppn directly
	1362	if(ppn_is_local(old.ppn))
	1363	{
	1364	page = ppm_ppn2page(&current_cluster->ppm, old.ppn);
	1365
	1366	if(page->mapper == NULL)
	1367	{
	1368	count = page_refcount_get(page);
	1369	if(count == 1)
	1370	{
	1371	newpage = page;//don't copy the page. use it directly.
	1372	isCountDown = false;
[178]	1373	vmm_dmsg(2, "%s: pid %d, tid %d, cpu %d, reuse same page for vaddr %x, pg_addr %x\n",
	1374	__FUNCTION__,
	1375	this->process->pid,
	1376	this->info.order,
	1377	cpu_get_id(),
	1378	vaddr,
[1]	1379	ppm_page2addr(page));
	1380	}
	1381	}
	1382	//else: we need to do the cow even if it's local!
	1383
	1384	}
	1385
	1386	//else: alocate newpage and copy the data from the remote node
	1387	//also defcount down the ppn
	1388	if(newpage == NULL)
[178]	1389	{
[1]	1390	req.type = KMEM_PAGE;
	1391	req.size = 0;
	1392	req.excep_code = AF_PGFAULT;
	1393
	1394	if((newpage = kmem_alloc(&req)) == NULL)
	1395	{
	1396	(void)pmm_unlock_page(&vseg->vmm->pmm, vaddr, &old);
	1397	return ENOMEM;
	1398	}
	1399
	1400	newpage->mapper = NULL;
	1401
	1402	ppn_copy(ppm_page2ppn(newpage), old.ppn);
	1403	assert(isCountDown);
	1404
[178]	1405	vmm_dmsg(2,
	1406	"%s: pid %d, tid %d, cpu %d, newpage for vaddr %x, pg_addr %x\n",
	1407	__FUNCTION__,
	1408	this->process->pid,
	1409	this->info.order,
	1410	cpu_get_id(),
	1411	vaddr,
[1]	1412	ppm_page2addr(newpage));
	1413
	1414	if(newpage->cid != current_cid)
	1415	this->info.remote_pages_cntr ++;
	1416	}
	1417
	1418	new.attr = vseg->vm_pgprot \| PMM_WRITE;
	1419	new.attr &= ~(PMM_COW \| PMM_MIGRATE);
	1420	new.ppn = ppm_page2ppn(newpage);
	1421	new.cluster = NULL;
	1422
	1423	//this also unlock the table entry (if no error)
	1424	error= pmm_set_page(&vseg->vmm->pmm, vaddr, &new);
	1425
	1426	if(err)
	1427	{
	1428	(void)pmm_unlock_page(&vseg->vmm->pmm, vaddr, &old);
	1429	req.ptr = newpage;
	1430	kmem_free(&req);
	1431	vmm_dmsg(3, "%s: ended [ error%d ]\n", __FUNCTION__, err);
	1432	return err;
	1433	}
	1434
	1435	if(isCountDown) ppn_refcount_down(old.ppn);
	1436
[178]	1437	vmm_dmsg(2, "%s, pid %d, tid %d, cpu %d, COW ended [vaddr %x]\n",
	1438	__FUNCTION__,
[1]	1439	this->process->pid,
	1440	this->info.order,
	1441	cpu_get_id(),
	1442	vaddr);
[178]	1443
[1]	1444	return 0;
	1445	}
	1446
	1447
	1448	//refcount is taken on the file at mmap
	1449	static inline error_t vmm_do_mapped( vseg_t *vseg, uint32_t vaddr, uint32_t excep_code)
	1450	{
	1451	ppn_t ppn;
	1452	error_t err;
	1453	uint32_t index;
	1454	bool_t isDone;
	1455	pmm_page_info_t info;
	1456	pmm_page_info_t current;
	1457	struct thread_s *this;
	1458
	1459	this = current_thread;
	1460
	1461	current.attr = 1;
	1462	current.ppn = 1;
	1463	isDone = false;
	1464
	1465	error= pmm_lock_page(&vseg->vmm->pmm, vaddr, &current);
	1466
	1467	if(err) return err;
	1468
	1469	if((current.isAtomic == false) \|\| (current.attr != 0))
	1470	{
	1471	#if CONFIG_SHOW_SPURIOUS_PGFAULT
[178]	1472	printk(INFO, "%s: pid %d, tid %d, cpu %d, nothing to do for vaddr %x\n",
	1473	__FUNCTION__,
	1474	this->process->pid,
	1475	this->info.order,
[1]	1476	cpu_get_id(),
	1477	vaddr);
	1478	#endif
	1479	this->info.spurious_pgfault_cntr ++;
	1480	pmm_tlb_flush_vaddr(vaddr, PMM_DATA);
	1481	return 0;
	1482	}
	1483
	1484	index = ((vaddr - vseg->vm_start) + vseg->vm_offset) >> PMM_PAGE_SHIFT;
	1485
	1486	//also hold a refcount!
[178]	1487	ppn = mapper_get_ppn(&vseg->vm_mapper,
	1488	index,
[1]	1489	MAPPER_SYNC_OP);
	1490
	1491	if(!ppn)
	1492	{
	1493	error= pmm_unlock_page(&vseg->vmm->pmm, vaddr, &current);
	1494	assert(!err); //FIXME: liberate the ppn ...
	1495	return (VFS_FILE_IS_NULL(vseg->vm_file)) ? EIO : ENOMEM;
	1496	}
	1497
	1498	info.attr = vseg->vm_pgprot;
	1499	info.ppn = ppn;
	1500	info.cluster = NULL;
	1501
	1502	//also unlock the page
	1503	error= pmm_set_page(&vseg->vmm->pmm, vaddr, &info);
	1504
	1505	assert(!err);//FIXME: liberate the ppn and unlock the table entry ...
	1506	//error= pmm_unlock_page(&vseg->vmm->pmm, vaddr, &current);
	1507
	1508	return err;
	1509	}
	1510
	1511	/////////////////////////////////////////////////////
	1512	static inline error_t vmm_do_aod( vseg_t *vseg, uint32_t vaddr)
	1513	{
	1514	register error_t err;
	1515	register struct page_s *page;
	1516	register struct cluster_s *cluster;
	1517	struct thread_s *this;
	1518	pmm_page_info_t old;
	1519	pmm_page_info_t new;
	1520	kmem_req_t req;
	1521
	1522	page = NULL;
	1523	old.attr = 0;
	1524	this = current_thread;
[178]	1525
[1]	1526	error= pmm_lock_page(&vseg->vmm->pmm, vaddr, &old);
	1527
	1528	if(err) return err;
	1529
	1530	if(old.isAtomic == false)
	1531	{
	1532	this->info.spurious_pgfault_cntr ++;
	1533	pmm_tlb_flush_vaddr(vaddr, PMM_DATA);
	1534	return 0;
	1535	}
	1536
	1537	req.type = KMEM_PAGE;
	1538	req.size = 0;
	1539	req.excep_code = AF_PGFAULT \| AF_ZERO;
	1540
	1541	if((page = kmem_alloc(&req)) == NULL)
	1542	{
	1543	(void)pmm_unlock_page(&vseg->vmm->pmm, vaddr, &old);
	1544	return ENOMEM;
	1545	}
	1546
	1547	page->mapper = NULL;
	1548
	1549	new.attr = vseg->vm_pgprot;
	1550	new.ppn = ppm_page2ppn(page);
	1551	new.cluster = NULL;
	1552
	1553	error= pmm_set_page(&vseg->vmm->pmm, vaddr, &new);
	1554
	1555	if(err) goto fail_set_pg;
	1556
	1557	cluster = current_cluster;
	1558
	1559	if(page->cid != cluster->id)
	1560	this->info.remote_pages_cntr ++;
	1561
	1562	return 0;
	1563
	1564	fail_set_pg:
	1565	(void)pmm_unlock_page(&vseg->vmm->pmm, vaddr, &old);
	1566	req.ptr = page;
	1567	kmem_free(&req);
	1568
	1569	vmm_dmsg(3, "%s: ended [ error%d ]\n", __FUNCTION__, err);
	1570	return err;
	1571	}
	1572
	1573	VSEGION_PAGE_FAULT(vmm_default_pagefault)
	1574	{
	1575	register struct thread_s *this;
	1576	register error_t err;
	1577	pmm_page_info_t info;
	1578
	1579	if((error= pmm_get_page(&vseg->vmm->pmm, vaddr, &info)))
	1580	return err;
	1581
	1582	if((info.attr != 0) && (info.ppn != 0))
	1583	{
	1584	if((info.attr & PMM_COW) && pmm_except_isWrite(excep_code))
	1585	{
	1586	error= vmm_do_cow(vseg, &info, vaddr);
	1587	return err;
	1588	}
	1589
	1590	if(info.attr & PMM_MIGRATE)
	1591	return vmm_do_migrate(vseg, &info, vaddr);
	1592
	1593	if(info.attr & PMM_PRESENT)
	1594	{
	1595	this = current_thread;
	1596
	1597	#if CONFIG_SHOW_SPURIOUS_PGFAULT
	1598	printk(WARNING, "WARNING: %s: pid %d, tid %d, cpu %d, excep_code %x but vaddr is valid %x, attr %x, ppn %x\n",
	1599	__FUNCTION__,
	1600	this->process->pid,
	1601	this->info.order,
	1602	cpu_get_id(),
	1603	excep_code,
	1604	vaddr,
	1605	info.attr,
	1606	info.ppn);
	1607	#endif
	1608
	1609	current_thread->info.spurious_pgfault_cntr ++;
	1610	pmm_tlb_flush_vaddr(vaddr, PMM_UNKNOWN);
	1611	return 0;
	1612	}
	1613
	1614	current_thread->info.spurious_pgfault_cntr ++;
	1615	pmm_tlb_flush_vaddr(vaddr, PMM_UNKNOWN);
	1616	return 0;
	1617	#if 0
	1618	#if CONFIG_SHOW_VMM_ERROR_MSG
[178]	1619	printk(ERROR,
[1]	1620	"ERROR: %s: pid %d, cpu %d, Unexpected page attributes configuration for vaddr %x, found: ppn %x, attr %x\n",
	1621	__FUNCTION__,
	1622	current_process->pid,
[178]	1623	cpu_get_id(),
	1624	vaddr,
[1]	1625	info.ppn,
	1626	info.attr);
	1627	#endif
[178]	1628
[1]	1629	return EPERM;
	1630	#endif
	1631	}
	1632
	1633	if(!MAPPER_IS_NULL(vseg->vm_mapper))
	1634	return vmm_do_mapped(vseg, vaddr, excep_code);
	1635
	1636	return vmm_do_aod(vseg, vaddr);
	1637	}
	1638	*/
	1639

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