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source: trunk/kernel/mm/vmm.c @ 614

Last change on this file since 614 was 614, checked in by alain, 5 years ago

1) introduce a dev_ioc_sync_write() function in IOC API,

to improve the DEVFS synchronous update.

2) fix a big bug in both the user_dir_create() and user_dir_destroy()

functions: add an extended pointer on the reference client process
in the function's arguments.

File size: 73.7 KB

Rev	Line
[1]	1	/*
[611]	2	* vmm.c - virtual memory manager related operations definition.
[1]	3	*
	4	* Authors Ghassan Almaless (2008,2009,2010,2011, 2012)
	5	* Mohamed Lamine Karaoui (2015)
[595]	6	* Alain Greiner (2016,2017,2018)
[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>
[457]	27	#include <hal_kernel_types.h>
[1]	28	#include <hal_special.h>
	29	#include <hal_gpt.h>
[409]	30	#include <hal_vmm.h>
[577]	31	#include <hal_macros.h>
[1]	32	#include <printk.h>
[23]	33	#include <memcpy.h>
[567]	34	#include <remote_rwlock.h>
	35	#include <remote_queuelock.h>
[1]	36	#include <list.h>
[408]	37	#include <xlist.h>
[1]	38	#include <bits.h>
	39	#include <process.h>
	40	#include <thread.h>
	41	#include <vseg.h>
	42	#include <cluster.h>
	43	#include <scheduler.h>
	44	#include <vfs.h>
	45	#include <mapper.h>
	46	#include <page.h>
	47	#include <kmem.h>
	48	#include <vmm.h>
[585]	49	#include <hal_exception.h>
[1]	50
	51	//////////////////////////////////////////////////////////////////////////////////
	52	// Extern global variables
	53	//////////////////////////////////////////////////////////////////////////////////
	54
[567]	55	extern process_t process_zero; // allocated in cluster.c
[1]	56
[415]	57	///////////////////////////////////////
	58	error_t vmm_init( process_t * process )
[21]	59	{
[1]	60	error_t error;
	61	vseg_t * vseg_kentry;
	62	vseg_t * vseg_args;
	63	vseg_t * vseg_envs;
	64	intptr_t base;
	65	intptr_t size;
[614]	66	uint32_t i;
[1]	67
[438]	68	#if DEBUG_VMM_INIT
[567]	69	thread_t * this = CURRENT_THREAD;
[433]	70	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	71	if( DEBUG_VMM_INIT )
[614]	72	printk("\n[%s] thread[%x,%x] enter for process %x in cluster %x / cycle %d\n",
	73	__FUNCTION__ , this->process->pid, this->trdid, process->pid, local_cxy, cycle );
[433]	74	#endif
[204]	75
[1]	76	// get pointer on VMM
	77	vmm_t * vmm = &process->vmm;
	78
[407]	79	// initialize local list of vsegs
	80	vmm->vsegs_nr = 0;
[408]	81	xlist_root_init( XPTR( local_cxy , &vmm->vsegs_root ) );
[580]	82	remote_rwlock_init( XPTR( local_cxy , &vmm->vsegs_lock ) , LOCK_VMM_VSL );
[407]	83
[567]	84	assert( ((CONFIG_VMM_KENTRY_SIZE + CONFIG_VMM_ARGS_SIZE + CONFIG_VMM_ENVS_SIZE)
	85	<= CONFIG_VMM_ELF_BASE) , "UTILS zone too small\n" );
[21]	86
[567]	87	assert( (CONFIG_THREADS_MAX_PER_CLUSTER <= 32) ,
	88	"no more than 32 threads per cluster for a single process\n");
[1]	89
[567]	90	assert( ((CONFIG_VMM_STACK_SIZE * CONFIG_THREADS_MAX_PER_CLUSTER) <=
	91	(CONFIG_VMM_VSPACE_SIZE - CONFIG_VMM_STACK_BASE)) ,
	92	"STACK zone too small\n");
[1]	93
[409]	94	// register kentry vseg in VSL
[406]	95	base = CONFIG_VMM_KENTRY_BASE << CONFIG_PPM_PAGE_SHIFT;
[1]	96	size = CONFIG_VMM_KENTRY_SIZE << CONFIG_PPM_PAGE_SHIFT;
[406]	97
[407]	98	vseg_kentry = vmm_create_vseg( process,
	99	VSEG_TYPE_CODE,
	100	base,
	101	size,
	102	0, // file_offset unused
	103	0, // file_size unused
	104	XPTR_NULL, // mapper_xp unused
	105	local_cxy );
[204]	106
[415]	107	if( vseg_kentry == NULL )
	108	{
	109	printk("\n[ERROR] in %s : cannot register kentry vseg\n", __FUNCTION__ );
	110	return -1;
	111	}
[204]	112
[406]	113	vmm->kent_vpn_base = base;
[1]	114
[409]	115	// register args vseg in VSL
[406]	116	base = (CONFIG_VMM_KENTRY_BASE +
	117	CONFIG_VMM_KENTRY_SIZE ) << CONFIG_PPM_PAGE_SHIFT;
[1]	118	size = CONFIG_VMM_ARGS_SIZE << CONFIG_PPM_PAGE_SHIFT;
[406]	119
[407]	120	vseg_args = vmm_create_vseg( process,
	121	VSEG_TYPE_DATA,
	122	base,
	123	size,
	124	0, // file_offset unused
	125	0, // file_size unused
	126	XPTR_NULL, // mapper_xp unused
	127	local_cxy );
[204]	128
[415]	129	if( vseg_args == NULL )
	130	{
	131	printk("\n[ERROR] in %s : cannot register args vseg\n", __FUNCTION__ );
	132	return -1;
	133	}
[204]	134
[406]	135	vmm->args_vpn_base = base;
[1]	136
[409]	137	// register the envs vseg in VSL
[406]	138	base = (CONFIG_VMM_KENTRY_BASE +
	139	CONFIG_VMM_KENTRY_SIZE +
	140	CONFIG_VMM_ARGS_SIZE ) << CONFIG_PPM_PAGE_SHIFT;
[1]	141	size = CONFIG_VMM_ENVS_SIZE << CONFIG_PPM_PAGE_SHIFT;
[406]	142
[407]	143	vseg_envs = vmm_create_vseg( process,
	144	VSEG_TYPE_DATA,
	145	base,
	146	size,
	147	0, // file_offset unused
	148	0, // file_size unused
	149	XPTR_NULL, // mapper_xp unused
	150	local_cxy );
[204]	151
[415]	152	if( vseg_envs == NULL )
	153	{
	154	printk("\n[ERROR] in %s : cannot register envs vseg\n", __FUNCTION__ );
	155	return -1;
	156	}
[204]	157
[406]	158	vmm->envs_vpn_base = base;
[1]	159
[409]	160	// create GPT (empty)
[1]	161	error = hal_gpt_create( &vmm->gpt );
	162
[415]	163	if( error )
	164	printk("\n[ERROR] in %s : cannot create GPT\n", __FUNCTION__ );
[204]	165
[585]	166	// initialize GPT lock
	167	remote_rwlock_init( XPTR( local_cxy , &vmm->gpt_lock ) , LOCK_VMM_GPT );
	168
	169	// architecture specic GPT initialisation
[409]	170	// (For TSAR, identity map the kentry_vseg)
	171	error = hal_vmm_init( vmm );
	172
[415]	173	if( error )
	174	printk("\n[ERROR] in %s : cannot initialize GPT\n", __FUNCTION__ );
[409]	175
[1]	176	// initialize STACK allocator
	177	vmm->stack_mgr.bitmap = 0;
	178	vmm->stack_mgr.vpn_base = CONFIG_VMM_STACK_BASE;
[567]	179	busylock_init( &vmm->stack_mgr.lock , LOCK_VMM_STACK );
[1]	180
	181	// initialize MMAP allocator
[407]	182	vmm->mmap_mgr.vpn_base = CONFIG_VMM_HEAP_BASE;
	183	vmm->mmap_mgr.vpn_size = CONFIG_VMM_STACK_BASE - CONFIG_VMM_HEAP_BASE;
	184	vmm->mmap_mgr.first_free_vpn = CONFIG_VMM_HEAP_BASE;
[567]	185	busylock_init( &vmm->mmap_mgr.lock , LOCK_VMM_MMAP );
[1]	186	for( i = 0 ; i < 32 ; i++ ) list_root_init( &vmm->mmap_mgr.zombi_list[i] );
	187
[21]	188	// initialize instrumentation counters
[409]	189	vmm->pgfault_nr = 0;
[1]	190
[124]	191	hal_fence();
[1]	192
[438]	193	#if DEBUG_VMM_INIT
[433]	194	cycle = (uint32_t)hal_get_cycles();
[438]	195	if( DEBUG_VMM_INIT )
[614]	196	printk("\n[%s] thread[%x,%x] exit for process %x in cluster %x / cycle %d\n",
	197	__FUNCTION__, this->process->pid, this->trdid, process->pid, local_cxy, cycle );
[433]	198	#endif
[204]	199
[415]	200	return 0;
	201
[204]	202	} // end vmm_init()
	203
[407]	204	//////////////////////////////////////
	205	void vmm_display( process_t * process,
	206	bool_t mapping )
	207	{
	208	vmm_t * vmm = &process->vmm;
	209	gpt_t * gpt = &vmm->gpt;
	210
[457]	211	printk("\n***** VSL and GPT(%x) for process %x in cluster %x\n\n",
	212	process->vmm.gpt.ptr , process->pid , local_cxy );
[407]	213
[585]	214	// get lock protecting the VSL and the GPT
[567]	215	remote_rwlock_rd_acquire( XPTR( local_cxy , &vmm->vsegs_lock ) );
[585]	216	remote_rwlock_rd_acquire( XPTR( local_cxy , &vmm->gpt_lock ) );
[407]	217
	218	// scan the list of vsegs
[408]	219	xptr_t root_xp = XPTR( local_cxy , &vmm->vsegs_root );
	220	xptr_t iter_xp;
	221	xptr_t vseg_xp;
[407]	222	vseg_t * vseg;
[408]	223	XLIST_FOREACH( root_xp , iter_xp )
[407]	224	{
[408]	225	vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist );
[433]	226	vseg = GET_PTR( vseg_xp );
[408]	227
[407]	228	printk(" - %s : base = %X / size = %X / npages = %d\n",
	229	vseg_type_str( vseg->type ) , vseg->min , vseg->max - vseg->min , vseg->vpn_size );
	230
	231	if( mapping )
	232	{
	233	vpn_t vpn;
	234	ppn_t ppn;
	235	uint32_t attr;
	236	vpn_t base = vseg->vpn_base;
	237	vpn_t size = vseg->vpn_size;
	238	for( vpn = base ; vpn < (base+size) ; vpn++ )
	239	{
[585]	240	hal_gpt_get_pte( XPTR( local_cxy , gpt ) , vpn , &attr , &ppn );
[407]	241	if( attr & GPT_MAPPED )
	242	{
	243	printk(" . vpn = %X / attr = %X / ppn = %X\n", vpn , attr , ppn );
	244	}
	245	}
	246	}
	247	}
	248
[585]	249	// release the locks
[567]	250	remote_rwlock_rd_release( XPTR( local_cxy , &vmm->vsegs_lock ) );
[585]	251	remote_rwlock_rd_release( XPTR( local_cxy , &vmm->gpt_lock ) );
[407]	252
[408]	253	} // vmm_display()
	254
[611]	255	//////////////////////////////////////////
	256	void vmm_attach_vseg_to_vsl( vmm_t * vmm,
	257	vseg_t * vseg )
[567]	258	{
	259	// build extended pointer on rwlock protecting VSL
	260	xptr_t lock_xp = XPTR( local_cxy , &vmm->vsegs_lock );
	261
	262	// get rwlock in write mode
	263	remote_rwlock_wr_acquire( lock_xp );
	264
	265	// update vseg descriptor
	266	vseg->vmm = vmm;
	267
	268	// add vseg in vmm list
	269	xlist_add_last( XPTR( local_cxy , &vmm->vsegs_root ),
	270	XPTR( local_cxy , &vseg->xlist ) );
	271
	272	// release rwlock in write mode
	273	remote_rwlock_wr_release( lock_xp );
	274	}
	275
[611]	276	////////////////////////////////////////////
	277	void vmm_detach_vseg_from_vsl( vmm_t * vmm,
	278	vseg_t * vseg )
[567]	279	{
[611]	280	// get vseg type
	281	uint32_t type = vseg->type;
	282
[567]	283	// build extended pointer on rwlock protecting VSL
	284	xptr_t lock_xp = XPTR( local_cxy , &vmm->vsegs_lock );
	285
	286	// get rwlock in write mode
	287	remote_rwlock_wr_acquire( lock_xp );
	288
	289	// update vseg descriptor
	290	vseg->vmm = NULL;
	291
[611]	292	// remove vseg from VSL
[567]	293	xlist_unlink( XPTR( local_cxy , &vseg->xlist ) );
	294
	295	// release rwlock in write mode
	296	remote_rwlock_wr_release( lock_xp );
	297
[611]	298	// release the stack slot to VMM stack allocator if STACK type
	299	if( type == VSEG_TYPE_STACK )
	300	{
	301	// get pointer on stack allocator
	302	stack_mgr_t * mgr = &vmm->stack_mgr;
	303
	304	// compute slot index
	305	uint32_t index = ((vseg->vpn_base - mgr->vpn_base - 1) / CONFIG_VMM_STACK_SIZE);
	306
	307	// update stacks_bitmap
	308	busylock_acquire( &mgr->lock );
	309	bitmap_clear( &mgr->bitmap , index );
	310	busylock_release( &mgr->lock );
	311	}
	312
	313	// release the vseg to VMM mmap allocator if MMAP type
	314	if( (type == VSEG_TYPE_ANON) \|\| (type == VSEG_TYPE_FILE) \|\| (type == VSEG_TYPE_REMOTE) )
	315	{
	316	// get pointer on mmap allocator
	317	mmap_mgr_t * mgr = &vmm->mmap_mgr;
	318
	319	// compute zombi_list index
	320	uint32_t index = bits_log2( vseg->vpn_size );
	321
	322	// update zombi_list
	323	busylock_acquire( &mgr->lock );
	324	list_add_first( &mgr->zombi_list[index] , &vseg->zlist );
	325	busylock_release( &mgr->lock );
	326	}
	327
	328	// release physical memory allocated for vseg descriptor if no MMAP type
	329	if( (type != VSEG_TYPE_ANON) && (type != VSEG_TYPE_FILE) && (type != VSEG_TYPE_REMOTE) )
	330	{
	331	vseg_free( vseg );
	332	}
	333
	334	} // end vmm_remove_vseg_from_vsl()
	335
[595]	336	////////////////////////////////////////////////
[433]	337	void vmm_global_update_pte( process_t * process,
	338	vpn_t vpn,
	339	uint32_t attr,
	340	ppn_t ppn )
[23]	341	{
[408]	342	xlist_entry_t * process_root_ptr;
	343	xptr_t process_root_xp;
	344	xptr_t process_iter_xp;
[23]	345
[408]	346	xptr_t remote_process_xp;
	347	cxy_t remote_process_cxy;
	348	process_t * remote_process_ptr;
	349	xptr_t remote_gpt_xp;
[23]	350
[408]	351	pid_t pid;
	352	cxy_t owner_cxy;
	353	lpid_t owner_lpid;
[23]	354
[438]	355	#if DEBUG_VMM_UPDATE_PTE
[433]	356	uint32_t cycle = (uint32_t)hal_get_cycles();
[595]	357	thread_t * this = CURRENT_THREAD;
[438]	358	if( DEBUG_VMM_UPDATE_PTE < cycle )
[595]	359	printk("\n[%s] thread[%x,%x] enter for process %x / vpn %x / cycle %d\n",
	360	__FUNCTION__, this->process->pid, this->trdid, process->pid , vpn , cycle );
[433]	361	#endif
	362
[567]	363	// check cluster is reference
[585]	364	assert( (GET_CXY( process->ref_xp ) == local_cxy) , "not called in reference cluster\n");
[433]	365
[408]	366	// get extended pointer on root of process copies xlist in owner cluster
	367	pid = process->pid;
	368	owner_cxy = CXY_FROM_PID( pid );
	369	owner_lpid = LPID_FROM_PID( pid );
	370	process_root_ptr = &LOCAL_CLUSTER->pmgr.copies_root[owner_lpid];
	371	process_root_xp = XPTR( owner_cxy , process_root_ptr );
[23]	372
[408]	373	// loop on destination process copies
	374	XLIST_FOREACH( process_root_xp , process_iter_xp )
	375	{
	376	// get cluster and local pointer on remote process
	377	remote_process_xp = XLIST_ELEMENT( process_iter_xp , process_t , copies_list );
[433]	378	remote_process_ptr = GET_PTR( remote_process_xp );
[408]	379	remote_process_cxy = GET_CXY( remote_process_xp );
[407]	380
[438]	381	#if (DEBUG_VMM_UPDATE_PTE & 0x1)
	382	if( DEBUG_VMM_UPDATE_PTE < cycle )
[595]	383	printk("\n[%s] threadr[%x,%x] handling vpn %x for process %x in cluster %x\n",
	384	__FUNCTION__, this->process->pid, this->trdid, vpn, process->pid, remote_process_cxy );
[433]	385	#endif
	386
[408]	387	// get extended pointer on remote gpt
	388	remote_gpt_xp = XPTR( remote_process_cxy , &remote_process_ptr->vmm.gpt );
	389
[433]	390	// update remote GPT
	391	hal_gpt_update_pte( remote_gpt_xp, vpn, attr, ppn );
[408]	392	}
	393
[438]	394	#if DEBUG_VMM_UPDATE_PTE
[433]	395	cycle = (uint32_t)hal_get_cycles();
[438]	396	if( DEBUG_VMM_UPDATE_PTE < cycle )
[595]	397	printk("\n[%s] thread[%x,%x] exit for process %x / vpn %x / cycle %d\n",
	398	__FUNCTION__, this->process->pid, this->trdid, process->pid , vpn , cycle );
[433]	399	#endif
	400
	401	} // end vmm_global_update_pte()
	402
[408]	403	///////////////////////////////////////
	404	void vmm_set_cow( process_t * process )
	405	{
	406	vmm_t * vmm;
	407
	408	xlist_entry_t * process_root_ptr;
	409	xptr_t process_root_xp;
	410	xptr_t process_iter_xp;
	411
	412	xptr_t remote_process_xp;
	413	cxy_t remote_process_cxy;
	414	process_t * remote_process_ptr;
	415	xptr_t remote_gpt_xp;
	416
	417	xptr_t vseg_root_xp;
	418	xptr_t vseg_iter_xp;
	419
	420	xptr_t vseg_xp;
	421	vseg_t * vseg;
	422
	423	pid_t pid;
	424	cxy_t owner_cxy;
	425	lpid_t owner_lpid;
	426
[438]	427	#if DEBUG_VMM_SET_COW
[595]	428	uint32_t cycle = (uint32_t)hal_get_cycles();
	429	thread_t * this = CURRENT_THREAD;
[438]	430	if( DEBUG_VMM_SET_COW < cycle )
[595]	431	printk("\n[%s] thread[%x,%x] enter for process %x / cycle %d\n",
	432	__FUNCTION__, this->process->pid, this->trdid, process->pid , cycle );
[433]	433	#endif
[408]	434
[567]	435	// check cluster is reference
	436	assert( (GET_CXY( process->ref_xp ) == local_cxy) ,
	437	"local cluster is not process reference cluster\n");
[408]	438
	439	// get pointer on reference VMM
	440	vmm = &process->vmm;
	441
	442	// get extended pointer on root of process copies xlist in owner cluster
	443	pid = process->pid;
	444	owner_cxy = CXY_FROM_PID( pid );
	445	owner_lpid = LPID_FROM_PID( pid );
	446	process_root_ptr = &LOCAL_CLUSTER->pmgr.copies_root[owner_lpid];
	447	process_root_xp = XPTR( owner_cxy , process_root_ptr );
	448
	449	// get extended pointer on root of vsegs xlist from reference VMM
	450	vseg_root_xp = XPTR( local_cxy , &vmm->vsegs_root );
	451
	452	// loop on destination process copies
	453	XLIST_FOREACH( process_root_xp , process_iter_xp )
	454	{
	455	// get cluster and local pointer on remote process
	456	remote_process_xp = XLIST_ELEMENT( process_iter_xp , process_t , copies_list );
[433]	457	remote_process_ptr = GET_PTR( remote_process_xp );
[408]	458	remote_process_cxy = GET_CXY( remote_process_xp );
	459
[595]	460	#if (DEBUG_VMM_SET_COW & 1)
[438]	461	if( DEBUG_VMM_SET_COW < cycle )
[595]	462	printk("\n[%s] thread[%x,%x] handling process %x in cluster %x\n",
	463	__FUNCTION__, this->process->pid, this->trdid, process->pid , remote_process_cxy );
[433]	464	#endif
[408]	465
	466	// get extended pointer on remote gpt
	467	remote_gpt_xp = XPTR( remote_process_cxy , &remote_process_ptr->vmm.gpt );
	468
	469	// loop on vsegs in (local) reference process VSL
	470	XLIST_FOREACH( vseg_root_xp , vseg_iter_xp )
	471	{
	472	// get pointer on vseg
	473	vseg_xp = XLIST_ELEMENT( vseg_iter_xp , vseg_t , xlist );
[433]	474	vseg = GET_PTR( vseg_xp );
[408]	475
[567]	476	assert( (GET_CXY( vseg_xp ) == local_cxy) ,
	477	"all vsegs in reference VSL must be local\n" );
[408]	478
	479	// get vseg type, base and size
	480	uint32_t type = vseg->type;
	481	vpn_t vpn_base = vseg->vpn_base;
	482	vpn_t vpn_size = vseg->vpn_size;
	483
[595]	484	#if (DEBUG_VMM_SET_COW & 1)
[438]	485	if( DEBUG_VMM_SET_COW < cycle )
[595]	486	printk("\n[%s] thread[%x,%x] handling vseg %s / vpn_base = %x / vpn_size = %x\n",
	487	__FUNCTION__, this->process->pid, this->trdid, vseg_type_str(type), vpn_base, vpn_size );
[433]	488	#endif
	489	// only DATA, ANON and REMOTE vsegs
[408]	490	if( (type == VSEG_TYPE_DATA) \|\|
	491	(type == VSEG_TYPE_ANON) \|\|
	492	(type == VSEG_TYPE_REMOTE) )
	493	{
[433]	494	vpn_t vpn;
	495	uint32_t attr;
	496	ppn_t ppn;
	497	xptr_t page_xp;
	498	cxy_t page_cxy;
	499	page_t * page_ptr;
	500	xptr_t forks_xp;
[469]	501	xptr_t lock_xp;
[433]	502
	503	// update flags in remote GPT
	504	hal_gpt_set_cow( remote_gpt_xp,
	505	vpn_base,
	506	vpn_size );
	507
	508	// atomically increment pending forks counter in physical pages,
	509	// for all vseg pages that are mapped in reference cluster
	510	if( remote_process_cxy == local_cxy )
	511	{
	512	// scan all pages in vseg
	513	for( vpn = vpn_base ; vpn < (vpn_base + vpn_size) ; vpn++ )
	514	{
	515	// get page attributes and PPN from reference GPT
[585]	516	hal_gpt_get_pte( remote_gpt_xp , vpn , &attr , &ppn );
[433]	517
	518	// atomically update pending forks counter if page is mapped
	519	if( attr & GPT_MAPPED )
	520	{
[469]	521	// get pointers and cluster on page descriptor
[433]	522	page_xp = ppm_ppn2page( ppn );
	523	page_cxy = GET_CXY( page_xp );
	524	page_ptr = GET_PTR( page_xp );
[469]	525
	526	// get extended pointers on "forks" and "lock"
[433]	527	forks_xp = XPTR( page_cxy , &page_ptr->forks );
[469]	528	lock_xp = XPTR( page_cxy , &page_ptr->lock );
	529
[567]	530	// take lock protecting "forks" counter
	531	remote_busylock_acquire( lock_xp );
	532
[469]	533	// increment "forks"
[433]	534	hal_remote_atomic_add( forks_xp , 1 );
[567]	535
	536	// release lock protecting "forks" counter
	537	remote_busylock_release( lock_xp );
[433]	538	}
	539	} // end loop on vpn
	540	} // end if local
	541	} // end if vseg type
	542	} // end loop on vsegs
[408]	543	} // end loop on process copies
	544
[438]	545	#if DEBUG_VMM_SET_COW
[433]	546	cycle = (uint32_t)hal_get_cycles();
[438]	547	if( DEBUG_VMM_SET_COW < cycle )
[595]	548	printk("\n[%s] thread[%x,%x] exit for process %x / cycle %d\n",
	549	__FUNCTION__, this->process->pid, this->trdid, process->pid , cycle );
[433]	550	#endif
[408]	551
	552	} // end vmm_set-cow()
	553
	554	/////////////////////////////////////////////////
	555	error_t vmm_fork_copy( process_t * child_process,
	556	xptr_t parent_process_xp )
	557	{
	558	error_t error;
	559	cxy_t parent_cxy;
	560	process_t * parent_process;
	561	vmm_t * parent_vmm;
	562	xptr_t parent_lock_xp;
	563	vmm_t * child_vmm;
	564	xptr_t iter_xp;
	565	xptr_t parent_vseg_xp;
	566	vseg_t * parent_vseg;
	567	vseg_t * child_vseg;
	568	uint32_t type;
	569	bool_t cow;
	570	vpn_t vpn;
	571	vpn_t vpn_base;
	572	vpn_t vpn_size;
[469]	573	xptr_t page_xp; // extended pointer on page descriptor
[408]	574	page_t * page_ptr;
	575	cxy_t page_cxy;
[469]	576	xptr_t forks_xp; // extended pointer on forks counter in page descriptor
	577	xptr_t lock_xp; // extended pointer on lock protecting the forks counter
[408]	578	xptr_t parent_root_xp;
	579	bool_t mapped;
	580	ppn_t ppn;
	581
[438]	582	#if DEBUG_VMM_FORK_COPY
[433]	583	uint32_t cycle = (uint32_t)hal_get_cycles();
[595]	584	thread_t * this = CURRENT_THREAD;
[438]	585	if( DEBUG_VMM_FORK_COPY < cycle )
[595]	586	printk("\n[%s] thread %x enter / cycle %d\n",
	587	__FUNCTION__ , this->process->pid, this->trdid, cycle );
[433]	588	#endif
[408]	589
	590	// get parent process cluster and local pointer
	591	parent_cxy = GET_CXY( parent_process_xp );
[433]	592	parent_process = GET_PTR( parent_process_xp );
[408]	593
	594	// get local pointers on parent and child VMM
	595	parent_vmm = &parent_process->vmm;
	596	child_vmm = &child_process->vmm;
	597
	598	// get extended pointer on lock protecting the parent VSL
	599	parent_lock_xp = XPTR( parent_cxy , &parent_vmm->vsegs_lock );
	600
	601	// initialize the lock protecting the child VSL
[567]	602	remote_rwlock_init( XPTR( local_cxy , &child_vmm->vsegs_lock ), LOCK_VMM_STACK );
[408]	603
	604	// initialize the child VSL as empty
	605	xlist_root_init( XPTR( local_cxy, &child_vmm->vsegs_root ) );
	606	child_vmm->vsegs_nr = 0;
	607
[415]	608	// create child GPT
[408]	609	error = hal_gpt_create( &child_vmm->gpt );
[415]	610
[407]	611	if( error )
	612	{
[408]	613	printk("\n[ERROR] in %s : cannot create GPT\n", __FUNCTION__ );
	614	return -1;
[407]	615	}
	616
[408]	617	// build extended pointer on parent VSL
	618	parent_root_xp = XPTR( parent_cxy , &parent_vmm->vsegs_root );
	619
[567]	620	// take the lock protecting the parent VSL in read mode
	621	remote_rwlock_rd_acquire( parent_lock_xp );
[415]	622
[408]	623	// loop on parent VSL xlist
	624	XLIST_FOREACH( parent_root_xp , iter_xp )
[23]	625	{
[408]	626	// get local and extended pointers on current parent vseg
	627	parent_vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist );
[433]	628	parent_vseg = GET_PTR( parent_vseg_xp );
[23]	629
[408]	630	// get vseg type
[567]	631	type = hal_remote_l32( XPTR( parent_cxy , &parent_vseg->type ) );
[408]	632
[438]	633	#if DEBUG_VMM_FORK_COPY
[433]	634	cycle = (uint32_t)hal_get_cycles();
[438]	635	if( DEBUG_VMM_FORK_COPY < cycle )
[595]	636	printk("\n[%s] thread[%x,%x] found parent vseg %s / vpn_base = %x / cycle %d\n",
	637	__FUNCTION__ , this->process->pid, this->trdid, vseg_type_str(type),
[567]	638	hal_remote_l32( XPTR( parent_cxy , &parent_vseg->vpn_base ) ) , cycle );
[433]	639	#endif
[23]	640
[408]	641	// all parent vsegs - but STACK - must be copied in child VSL
	642	if( type != VSEG_TYPE_STACK )
[23]	643	{
[408]	644	// allocate memory for a new child vseg
	645	child_vseg = vseg_alloc();
	646	if( child_vseg == NULL ) // release all allocated vsegs
[23]	647	{
[408]	648	vmm_destroy( child_process );
	649	printk("\n[ERROR] in %s : cannot create vseg for child\n", __FUNCTION__ );
	650	return -1;
[23]	651	}
	652
[408]	653	// copy parent vseg to child vseg
	654	vseg_init_from_ref( child_vseg , parent_vseg_xp );
[23]	655
[408]	656	// register child vseg in child VSL
[611]	657	vmm_attach_vseg_to_vsl( child_vmm , child_vseg );
[407]	658
[438]	659	#if DEBUG_VMM_FORK_COPY
[433]	660	cycle = (uint32_t)hal_get_cycles();
[438]	661	if( DEBUG_VMM_FORK_COPY < cycle )
[595]	662	printk("\n[%s] thread[%x,%x] copied vseg %s / vpn_base = %x to child VSL / cycle %d\n",
	663	__FUNCTION__ , this->process->pid, this->trdid, vseg_type_str(type),
[567]	664	hal_remote_l32( XPTR( parent_cxy , &parent_vseg->vpn_base ) ) , cycle );
[433]	665	#endif
[23]	666
[408]	667	// copy DATA, MMAP, REMOTE, FILE parent GPT entries to child GPT
	668	if( type != VSEG_TYPE_CODE )
	669	{
	670	// activate the COW for DATA, MMAP, REMOTE vsegs only
	671	cow = ( type != VSEG_TYPE_FILE );
[23]	672
[408]	673	vpn_base = child_vseg->vpn_base;
	674	vpn_size = child_vseg->vpn_size;
[23]	675
[408]	676	// scan pages in parent vseg
	677	for( vpn = vpn_base ; vpn < (vpn_base + vpn_size) ; vpn++ )
	678	{
	679	error = hal_gpt_pte_copy( &child_vmm->gpt,
	680	XPTR( parent_cxy , &parent_vmm->gpt ),
	681	vpn,
	682	cow,
	683	&ppn,
	684	&mapped );
	685	if( error )
	686	{
	687	vmm_destroy( child_process );
	688	printk("\n[ERROR] in %s : cannot copy GPT\n", __FUNCTION__ );
	689	return -1;
	690	}
	691
[433]	692	// increment pending forks counter in page if mapped
[408]	693	if( mapped )
	694	{
[469]	695	// get pointers and cluster on page descriptor
	696	page_xp = ppm_ppn2page( ppn );
[408]	697	page_cxy = GET_CXY( page_xp );
[433]	698	page_ptr = GET_PTR( page_xp );
[408]	699
[469]	700	// get extended pointers on "forks" and "lock"
	701	forks_xp = XPTR( page_cxy , &page_ptr->forks );
	702	lock_xp = XPTR( page_cxy , &page_ptr->lock );
	703
[567]	704	// get lock protecting "forks" counter
	705	remote_busylock_acquire( lock_xp );
	706
[469]	707	// increment "forks"
	708	hal_remote_atomic_add( forks_xp , 1 );
	709
[567]	710	// release lock protecting "forks" counter
	711	remote_busylock_release( lock_xp );
	712
[438]	713	#if DEBUG_VMM_FORK_COPY
[433]	714	cycle = (uint32_t)hal_get_cycles();
[438]	715	if( DEBUG_VMM_FORK_COPY < cycle )
[595]	716	printk("\n[%s] thread[%x,%x] copied vpn %x to child GPT / cycle %d\n",
	717	__FUNCTION__ , this->process->pid, this->trdid , vpn , cycle );
[433]	718	#endif
[408]	719	}
	720	}
	721	} // end if no code & no stack
	722	} // end if no stack
	723	} // end loop on vsegs
	724
[567]	725	// release the parent VSL lock in read mode
	726	remote_rwlock_rd_release( parent_lock_xp );
[408]	727
[415]	728	// initialize child GPT (architecture specic)
	729	// => For TSAR, identity map the kentry_vseg
	730	error = hal_vmm_init( child_vmm );
	731
	732	if( error )
	733	{
	734	printk("\n[ERROR] in %s : cannot create GPT\n", __FUNCTION__ );
	735	return -1;
	736	}
	737
[408]	738	// initialize the child VMM STACK allocator
	739	child_vmm->stack_mgr.bitmap = 0;
	740	child_vmm->stack_mgr.vpn_base = CONFIG_VMM_STACK_BASE;
	741
	742	// initialize the child VMM MMAP allocator
[23]	743	uint32_t i;
[408]	744	child_vmm->mmap_mgr.vpn_base = CONFIG_VMM_HEAP_BASE;
	745	child_vmm->mmap_mgr.vpn_size = CONFIG_VMM_STACK_BASE - CONFIG_VMM_HEAP_BASE;
	746	child_vmm->mmap_mgr.first_free_vpn = CONFIG_VMM_HEAP_BASE;
	747	for( i = 0 ; i < 32 ; i++ ) list_root_init( &child_vmm->mmap_mgr.zombi_list[i] );
[23]	748
[178]	749	// initialize instrumentation counters
[408]	750	child_vmm->pgfault_nr = 0;
[23]	751
[408]	752	// copy base addresses from parent VMM to child VMM
	753	child_vmm->kent_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->kent_vpn_base));
	754	child_vmm->args_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->args_vpn_base));
	755	child_vmm->envs_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->envs_vpn_base));
	756	child_vmm->heap_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->heap_vpn_base));
	757	child_vmm->code_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->code_vpn_base));
	758	child_vmm->data_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->data_vpn_base));
[23]	759
[408]	760	child_vmm->entry_point = (intptr_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->entry_point));
[23]	761
[124]	762	hal_fence();
[23]	763
[438]	764	#if DEBUG_VMM_FORK_COPY
[433]	765	cycle = (uint32_t)hal_get_cycles();
[438]	766	if( DEBUG_VMM_FORK_COPY < cycle )
[595]	767	printk("\n[%s] thread[%x,%x] exit successfully / cycle %d\n",
	768	__FUNCTION__ , this->process->pid, this->trdid , cycle );
[433]	769	#endif
	770
[23]	771	return 0;
	772
[408]	773	} // vmm_fork_copy()
[204]	774
[1]	775	///////////////////////////////////////
	776	void vmm_destroy( process_t * process )
	777	{
[408]	778	xptr_t vseg_xp;
[1]	779	vseg_t * vseg;
	780
[438]	781	#if DEBUG_VMM_DESTROY
[433]	782	uint32_t cycle = (uint32_t)hal_get_cycles();
[595]	783	thread_t * this = CURRENT_THREAD;
[438]	784	if( DEBUG_VMM_DESTROY < cycle )
[595]	785	printk("\n[%s] thread[%x,%x] enter for process %x in cluster %x / cycle %d\n",
	786	__FUNCTION__, this->process->pid, this->trdid, process->pid, local_cxy, cycle );
[433]	787	#endif
[416]	788
[438]	789	#if (DEBUG_VMM_DESTROY & 1 )
[443]	790	if( DEBUG_VMM_DESTROY < cycle )
[437]	791	vmm_display( process , true );
	792	#endif
	793
[433]	794	// get pointer on local VMM
[1]	795	vmm_t * vmm = &process->vmm;
	796
[408]	797	// get extended pointer on VSL root and VSL lock
	798	xptr_t root_xp = XPTR( local_cxy , &vmm->vsegs_root );
	799
[611]	800	// scan the VSL to delete all registered vsegs
	801	// (don't use a FOREACH for item deletion in xlist)
[408]	802	while( !xlist_is_empty( root_xp ) )
[1]	803	{
[409]	804	// get pointer on first vseg in VSL
[567]	805	vseg_xp = XLIST_FIRST( root_xp , vseg_t , xlist );
[433]	806	vseg = GET_PTR( vseg_xp );
[409]	807
[611]	808	// delete vseg and release physical pages
	809	vmm_delete_vseg( process->pid , vseg->min );
[409]	810
[443]	811	#if( DEBUG_VMM_DESTROY & 1 )
	812	if( DEBUG_VMM_DESTROY < cycle )
[611]	813	printk("\n[%s] %s vseg deleted / vpn_base %x / vpn_size %d\n",
[443]	814	__FUNCTION__ , vseg_type_str( vseg->type ), vseg->vpn_base, vseg->vpn_size );
	815	#endif
	816
[1]	817	}
	818
	819	// remove all vsegs from zombi_lists in MMAP allocator
	820	uint32_t i;
	821	for( i = 0 ; i<32 ; i++ )
	822	{
	823	while( !list_is_empty( &vmm->mmap_mgr.zombi_list[i] ) )
	824	{
[408]	825	vseg = LIST_FIRST( &vmm->mmap_mgr.zombi_list[i] , vseg_t , zlist );
[443]	826
	827	#if( DEBUG_VMM_DESTROY & 1 )
	828	if( DEBUG_VMM_DESTROY < cycle )
[595]	829	printk("\n[%s] found zombi vseg / vpn_base %x / vpn_size %d\n",
[443]	830	__FUNCTION__ , vseg_type_str( vseg->type ), vseg->vpn_base, vseg->vpn_size );
	831	#endif
[611]	832	// clean vseg descriptor
	833	vseg->vmm = NULL;
	834
	835	// remove vseg from xlist
	836	xlist_unlink( XPTR( local_cxy , &vseg->xlist ) );
	837
	838	// release vseg descriptor
[1]	839	vseg_free( vseg );
[443]	840
	841	#if( DEBUG_VMM_DESTROY & 1 )
	842	if( DEBUG_VMM_DESTROY < cycle )
[595]	843	printk("\n[%s] zombi vseg released / vpn_base %x / vpn_size %d\n",
[443]	844	__FUNCTION__ , vseg_type_str( vseg->type ), vseg->vpn_base, vseg->vpn_size );
	845	#endif
[1]	846	}
	847	}
	848
[409]	849	// release memory allocated to the GPT itself
[1]	850	hal_gpt_destroy( &vmm->gpt );
	851
[438]	852	#if DEBUG_VMM_DESTROY
[433]	853	cycle = (uint32_t)hal_get_cycles();
[438]	854	if( DEBUG_VMM_DESTROY < cycle )
[595]	855	printk("\n[%s] thread[%x,%x] exit for process %x in cluster %x / cycle %d\n",
	856	__FUNCTION__, this->process->pid, this->trdid, process->pid, local_cxy , cycle );
[433]	857	#endif
[416]	858
[204]	859	} // end vmm_destroy()
	860
[1]	861	/////////////////////////////////////////////////
	862	vseg_t * vmm_check_conflict( process_t * process,
[21]	863	vpn_t vpn_base,
[1]	864	vpn_t vpn_size )
	865	{
	866	vmm_t * vmm = &process->vmm;
[408]	867
	868	// scan the VSL
[1]	869	vseg_t * vseg;
[408]	870	xptr_t iter_xp;
	871	xptr_t vseg_xp;
	872	xptr_t root_xp = XPTR( local_cxy , &vmm->vsegs_root );
[1]	873
[408]	874	XLIST_FOREACH( root_xp , iter_xp )
[1]	875	{
[408]	876	vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist );
[433]	877	vseg = GET_PTR( vseg_xp );
[204]	878
[21]	879	if( ((vpn_base + vpn_size) > vseg->vpn_base) &&
	880	(vpn_base < (vseg->vpn_base + vseg->vpn_size)) ) return vseg;
[1]	881	}
	882	return NULL;
	883
[204]	884	} // end vmm_check_conflict()
	885
[1]	886	////////////////////////////////////////////////////////////////////////////////////////////
	887	// This static function is called by the vmm_create_vseg() function, and implements
	888	// the VMM stack_vseg specific allocator.
	889	////////////////////////////////////////////////////////////////////////////////////////////
	890	// @ vmm : pointer on VMM.
[21]	891	// @ vpn_base : (return value) first allocated page
[1]	892	// @ vpn_size : (return value) number of allocated pages
	893	////////////////////////////////////////////////////////////////////////////////////////////
	894	static error_t vmm_stack_alloc( vmm_t * vmm,
	895	vpn_t * vpn_base,
	896	vpn_t * vpn_size )
	897	{
	898	// get stack allocator pointer
	899	stack_mgr_t * mgr = &vmm->stack_mgr;
	900
	901	// get lock on stack allocator
[567]	902	busylock_acquire( &mgr->lock );
[1]	903
	904	// get first free slot index in bitmap
	905	int32_t index = bitmap_ffc( &mgr->bitmap , 4 );
[179]	906	if( (index < 0) \|\| (index > 31) )
	907	{
[567]	908	busylock_release( &mgr->lock );
	909	return 0xFFFFFFFF;
[179]	910	}
[1]	911
	912	// update bitmap
	913	bitmap_set( &mgr->bitmap , index );
[21]	914
[1]	915	// release lock on stack allocator
[567]	916	busylock_release( &mgr->lock );
[1]	917
[21]	918	// returns vpn_base, vpn_size (one page non allocated)
[1]	919	vpn_base = mgr->vpn_base + index CONFIG_VMM_STACK_SIZE + 1;
	920	*vpn_size = CONFIG_VMM_STACK_SIZE - 1;
	921	return 0;
	922
[204]	923	} // end vmm_stack_alloc()
	924
[1]	925	////////////////////////////////////////////////////////////////////////////////////////////
	926	// This static function is called by the vmm_create_vseg() function, and implements
	927	// the VMM MMAP specific allocator.
	928	////////////////////////////////////////////////////////////////////////////////////////////
	929	// @ vmm : [in] pointer on VMM.
	930	// @ npages : [in] requested number of pages.
[21]	931	// @ vpn_base : [out] first allocated page.
[1]	932	// @ vpn_size : [out] actual number of allocated pages.
	933	////////////////////////////////////////////////////////////////////////////////////////////
	934	static error_t vmm_mmap_alloc( vmm_t * vmm,
	935	vpn_t npages,
	936	vpn_t * vpn_base,
	937	vpn_t * vpn_size )
	938	{
	939	uint32_t index;
	940	vseg_t * vseg;
	941	vpn_t base;
	942	vpn_t size;
[21]	943	vpn_t free;
[1]	944
[614]	945	#if DEBUG_VMM_MMAP_ALLOC
	946	thread_t * this = CURRENT_THREAD;
	947	uint32_t cycle = (uint32_t)hal_get_cycles();
	948	if( DEBUG_VMM_MMAP_ALLOC < cycle )
	949	printk("\n[%s] thread[%x,%x] enter / cycle %d\n",
	950	__FUNCTION__, this->process->pid, this->trdid, cycle );
	951	#endif
	952
	953	// vseg size must be power of 2
[1]	954	// compute actual size and index in zombi_list array
	955	size = POW2_ROUNDUP( npages );
	956	index = bits_log2( size );
	957
	958	// get mmap allocator pointer
	959	mmap_mgr_t * mgr = &vmm->mmap_mgr;
	960
[614]	961	printk("\n@@@ in %s : size = %d / index = %d / first = %d / empty = %d\n",
	962	__FUNCTION__, size, index, mgr->vpn_size, list_is_empty(&mgr->zombi_list[index]) );
	963
[1]	964	// get lock on mmap allocator
[567]	965	busylock_acquire( &mgr->lock );
[1]	966
	967	// get vseg from zombi_list or from mmap zone
	968	if( list_is_empty( &mgr->zombi_list[index] ) ) // from mmap zone
	969	{
[614]	970
	971	printk("\n@@@ from mmap zone\n" );
	972
[1]	973	// check overflow
	974	free = mgr->first_free_vpn;
[614]	975	if( (free + size) > mgr->vpn_size ) return -1;
[1]	976
[614]	977	// update MMAP allocator
[1]	978	mgr->first_free_vpn += size;
	979
	980	// compute base
	981	base = free;
	982	}
	983	else // from zombi_list
	984	{
[614]	985
	986	printk("\n@@@ from zombi_list\n" );
	987
[1]	988	// get pointer on zombi vseg from zombi_list
[408]	989	vseg = LIST_FIRST( &mgr->zombi_list[index] , vseg_t , zlist );
[1]	990
	991	// remove vseg from free-list
[408]	992	list_unlink( &vseg->zlist );
[1]	993
	994	// compute base
	995	base = vseg->vpn_base;
[21]	996	}
	997
[1]	998	// release lock on mmap allocator
[567]	999	busylock_release( &mgr->lock );
[1]	1000
[614]	1001	#if DEBUG_VMM_MMAP_ALLOC
	1002	cycle = (uint32_t)hal_get_cycles();
	1003	if( DEBUG_VMM_DESTROY < cycle )
	1004	printk("\n[%s] thread[%x,%x] exit / vpn_base %x / vpn_size %x / cycle %d\n",
	1005	__FUNCTION__, this->process->pid, this->trdid, base, size, cycle );
	1006	#endif
	1007
[1]	1008	// returns vpn_base, vpn_size
	1009	*vpn_base = base;
	1010	*vpn_size = size;
	1011	return 0;
	1012
[204]	1013	} // end vmm_mmap_alloc()
	1014
[407]	1015	////////////////////////////////////////////////
	1016	vseg_t * vmm_create_vseg( process_t * process,
	1017	vseg_type_t type,
	1018	intptr_t base,
	1019	uint32_t size,
	1020	uint32_t file_offset,
	1021	uint32_t file_size,
	1022	xptr_t mapper_xp,
	1023	cxy_t cxy )
[1]	1024	{
	1025	vseg_t * vseg; // created vseg pointer
[204]	1026	vpn_t vpn_base; // first page index
[595]	1027	vpn_t vpn_size; // number of pages covered by vseg
[1]	1028	error_t error;
	1029
[438]	1030	#if DEBUG_VMM_CREATE_VSEG
[595]	1031	thread_t * this = CURRENT_THREAD;
	1032	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	1033	if( DEBUG_VMM_CREATE_VSEG < cycle )
[614]	1034	printk("\n[%s] thread[%x,%x] enter for process %x / %s / cxy %x / cycle %d\n",
	1035	__FUNCTION__, this->process->pid, this->trdid, process->pid, vseg_type_str(type), cxy, cycle );
[433]	1036	#endif
[21]	1037
[407]	1038	// get pointer on VMM
	1039	vmm_t * vmm = &process->vmm;
[21]	1040
[204]	1041	// compute base, size, vpn_base, vpn_size, depending on vseg type
[407]	1042	// we use the VMM specific allocators for "stack", "file", "anon", & "remote" vsegs
[595]	1043
[1]	1044	if( type == VSEG_TYPE_STACK )
	1045	{
	1046	// get vpn_base and vpn_size from STACK allocator
	1047	error = vmm_stack_alloc( vmm , &vpn_base , &vpn_size );
	1048	if( error )
	1049	{
[407]	1050	printk("\n[ERROR] in %s : no space for stack vseg / process %x in cluster %x\n",
	1051	__FUNCTION__ , process->pid , local_cxy );
[1]	1052	return NULL;
	1053	}
	1054
	1055	// compute vseg base and size from vpn_base and vpn_size
	1056	base = vpn_base << CONFIG_PPM_PAGE_SHIFT;
	1057	size = vpn_size << CONFIG_PPM_PAGE_SHIFT;
	1058	}
[595]	1059	else if( type == VSEG_TYPE_FILE )
	1060	{
	1061	// compute page index (in mapper) for first byte
	1062	vpn_t vpn_min = file_offset >> CONFIG_PPM_PAGE_SHIFT;
	1063
	1064	// compute page index (in mapper) for last byte
	1065	vpn_t vpn_max = (file_offset + size - 1) >> CONFIG_PPM_PAGE_SHIFT;
	1066
	1067	// compute offset in first page
	1068	uint32_t offset = file_offset & CONFIG_PPM_PAGE_MASK;
	1069
	1070	// compute number of pages required in virtual space
	1071	vpn_t npages = vpn_max - vpn_min + 1;
	1072
	1073	// get vpn_base and vpn_size from MMAP allocator
	1074	error = vmm_mmap_alloc( vmm , npages , &vpn_base , &vpn_size );
	1075	if( error )
	1076	{
	1077	printk("\n[ERROR] in %s : no vspace for mmap vseg / process %x in cluster %x\n",
	1078	__FUNCTION__ , process->pid , local_cxy );
	1079	return NULL;
	1080	}
	1081
	1082	// set the vseg base (not always aligned for FILE)
	1083	base = (vpn_base << CONFIG_PPM_PAGE_SHIFT) + offset;
	1084	}
[21]	1085	else if( (type == VSEG_TYPE_ANON) \|\|
[1]	1086	(type == VSEG_TYPE_REMOTE) )
	1087	{
[595]	1088	// compute number of required pages in virtual space
	1089	vpn_t npages = size >> CONFIG_PPM_PAGE_SHIFT;
	1090	if( size & CONFIG_PPM_PAGE_MASK) npages++;
	1091
[1]	1092	// get vpn_base and vpn_size from MMAP allocator
	1093	error = vmm_mmap_alloc( vmm , npages , &vpn_base , &vpn_size );
	1094	if( error )
	1095	{
	1096	printk("\n[ERROR] in %s : no vspace for mmap vseg / process %x in cluster %x\n",
	1097	__FUNCTION__ , process->pid , local_cxy );
	1098	return NULL;
	1099	}
	1100
[595]	1101	// set vseg base (always aligned for ANON or REMOTE)
[1]	1102	base = vpn_base << CONFIG_PPM_PAGE_SHIFT;
	1103	}
[595]	1104	else // VSEG_TYPE_DATA or VSEG_TYPE_CODE
[1]	1105	{
[204]	1106	uint32_t vpn_min = base >> CONFIG_PPM_PAGE_SHIFT;
	1107	uint32_t vpn_max = (base + size - 1) >> CONFIG_PPM_PAGE_SHIFT;
	1108
	1109	vpn_base = vpn_min;
	1110	vpn_size = vpn_max - vpn_min + 1;
[1]	1111	}
	1112
	1113	// check collisions
	1114	vseg = vmm_check_conflict( process , vpn_base , vpn_size );
	1115	if( vseg != NULL )
	1116	{
[614]	1117	printk("\n[ERROR] in %s for process %x : new vseg [vpn_base %x / vpn_size %x]\n"
	1118	" overlap existing vseg [vpn_base %x / vpn_size %x]\n",
[407]	1119	__FUNCTION__ , process->pid, vpn_base, vpn_size, vseg->vpn_base, vseg->vpn_size );
[1]	1120	return NULL;
	1121	}
	1122
	1123	// allocate physical memory for vseg descriptor
	1124	vseg = vseg_alloc();
	1125	if( vseg == NULL )
	1126	{
	1127	printk("\n[ERROR] in %s for process %x : cannot allocate memory for vseg\n",
[407]	1128	__FUNCTION__ , process->pid );
[1]	1129	return NULL;
	1130	}
	1131
[614]	1132	#if DEBUG_VMM_CREATE_VSEG
	1133	if( DEBUG_VMM_CREATE_VSEG < cycle )
	1134	printk("\n[%s] thread[%x,%x] : base %x / size %x / vpn_base %x / vpn_size %x\n",
	1135	__FUNCTION__, this->process->pid, this->trdid, base, size, vpn_base, vpn_size );
	1136	#endif
	1137
[1]	1138	// initialize vseg descriptor
[407]	1139	vseg_init( vseg,
	1140	type,
	1141	base,
	1142	size,
	1143	vpn_base,
	1144	vpn_size,
	1145	file_offset,
	1146	file_size,
	1147	mapper_xp,
	1148	cxy );
[1]	1149
[408]	1150	// attach vseg to VSL
[611]	1151	vmm_attach_vseg_to_vsl( vmm , vseg );
[1]	1152
[438]	1153	#if DEBUG_VMM_CREATE_VSEG
[433]	1154	cycle = (uint32_t)hal_get_cycles();
[438]	1155	if( DEBUG_VMM_CREATE_VSEG < cycle )
[595]	1156	printk("\n[%s] thread[%x,%x] exit / %s / cxy %x / cycle %d\n",
	1157	__FUNCTION__, this->process->pid, this->trdid, vseg_type_str(type), cxy, cycle );
[433]	1158	#endif
[21]	1159
[1]	1160	return vseg;
	1161
[406]	1162	} // vmm_create_vseg()
	1163
[611]	1164	///////////////////////////////////
	1165	void vmm_delete_vseg( pid_t pid,
	1166	intptr_t vaddr )
[1]	1167	{
[611]	1168	process_t * process; // local pointer on local process
	1169	vmm_t * vmm; // local pointer on local process VMM
	1170	vseg_t * vseg; // local pointer on local vseg containing vaddr
	1171	gpt_t * gpt; // local pointer on local process GPT
[21]	1172	vpn_t vpn; // VPN of current PTE
	1173	vpn_t vpn_min; // VPN of first PTE
[1]	1174	vpn_t vpn_max; // VPN of last PTE (excluded)
[409]	1175	ppn_t ppn; // current PTE ppn value
	1176	uint32_t attr; // current PTE attributes
	1177	kmem_req_t req; // request to release memory
	1178	xptr_t page_xp; // extended pointer on page descriptor
	1179	cxy_t page_cxy; // page descriptor cluster
	1180	page_t * page_ptr; // page descriptor pointer
[433]	1181	xptr_t forks_xp; // extended pointer on pending forks counter
[469]	1182	xptr_t lock_xp; // extended pointer on lock protecting forks counter
	1183	uint32_t forks; // actual number of pendinf forks
[1]	1184
[611]	1185	#if DEBUG_VMM_DELETE_VSEG
[595]	1186	uint32_t cycle = (uint32_t)hal_get_cycles();
	1187	thread_t * this = CURRENT_THREAD;
[611]	1188	if( DEBUG_VMM_DELETE_VSEG < cycle )
	1189	printk("\n[%s] thread[%x,%x] enter / process %x / vaddr %x / cycle %d\n",
	1190	__FUNCTION__, this->process->pid, this->trdid, pid, vaddr, cycle );
[433]	1191	#endif
[409]	1192
[611]	1193	// get local pointer on local process descriptor
	1194	process = cluster_get_local_process_from_pid( pid );
[1]	1195
[611]	1196	if( process == NULL ) return;
	1197
	1198	// get pointers on local process VMM an GPT
	1199	vmm = &process->vmm;
	1200	gpt = &process->vmm.gpt;
	1201
	1202	// get local pointer on vseg containing vaddr
	1203	vseg = vmm_vseg_from_vaddr( vmm , vaddr );
	1204
	1205	if( vseg == NULL ) return;
	1206
	1207	// loop to invalidate all vseg PTEs in GPT
[1]	1208	vpn_min = vseg->vpn_base;
	1209	vpn_max = vpn_min + vseg->vpn_size;
	1210	for( vpn = vpn_min ; vpn < vpn_max ; vpn++ )
	1211	{
[409]	1212	// get GPT entry
[585]	1213	hal_gpt_get_pte( XPTR( local_cxy , gpt ) , vpn , &attr , &ppn );
[409]	1214
	1215	if( attr & GPT_MAPPED ) // entry is mapped
	1216	{
[437]	1217
[611]	1218	#if( DEBUG_VMM_DELETE_VSEG & 1 )
	1219	if( DEBUG_VMM_DELETE_VSEG < cycle )
	1220	printk("- unmap vpn %x / ppn %x / vseg %s \n" , vpn , ppn, vseg_type_str(vseg->type) );
[437]	1221	#endif
	1222
[567]	1223	// check small page
[585]	1224	assert( (attr & GPT_SMALL) , "an user vseg must use small pages" );
[409]	1225
[585]	1226	// unmap GPT entry in local GPT
[409]	1227	hal_gpt_reset_pte( gpt , vpn );
	1228
[433]	1229	// handle pending forks counter if
	1230	// 1) not identity mapped
[567]	1231	// 2) reference cluster
[433]	1232	if( ((vseg->flags & VSEG_IDENT) == 0) &&
	1233	(GET_CXY( process->ref_xp ) == local_cxy) )
[409]	1234	{
[433]	1235	// get extended pointer on physical page descriptor
[409]	1236	page_xp = ppm_ppn2page( ppn );
	1237	page_cxy = GET_CXY( page_xp );
[433]	1238	page_ptr = GET_PTR( page_xp );
[409]	1239
[469]	1240	// get extended pointers on forks and lock fields
	1241	forks_xp = XPTR( page_cxy , &page_ptr->forks );
	1242	lock_xp = XPTR( page_cxy , &page_ptr->lock );
[433]	1243
	1244	// get pending forks counter
[567]	1245	forks = hal_remote_l32( forks_xp );
[433]	1246
[469]	1247	if( forks ) // decrement pending forks counter
[409]	1248	{
[433]	1249	hal_remote_atomic_add( forks_xp , -1 );
	1250	}
	1251	else // release physical page to relevant cluster
[409]	1252	{
[433]	1253	if( page_cxy == local_cxy ) // local cluster
	1254	{
	1255	req.type = KMEM_PAGE;
	1256	req.ptr = page_ptr;
	1257	kmem_free( &req );
	1258	}
	1259	else // remote cluster
	1260	{
	1261	rpc_pmem_release_pages_client( page_cxy , page_ptr );
	1262	}
[611]	1263
	1264	#if( DEBUG_VMM_DELETE_VSEG & 1 )
	1265	if( DEBUG_VMM_DELETE_VSEG < cycle )
	1266	printk("- release ppn %x\n", ppn );
	1267	#endif
[409]	1268	}
	1269	}
	1270	}
[1]	1271	}
[433]	1272
[611]	1273	// remove vseg from VSL and release vseg descriptor (if not MMAP)
	1274	vmm_detach_vseg_from_vsl( vmm , vseg );
	1275
	1276	#if DEBUG_VMM_DELETE_VSEG
[433]	1277	cycle = (uint32_t)hal_get_cycles();
[611]	1278	if( DEBUG_VMM_DELETE_VSEG < cycle )
[595]	1279	printk("\n[%s] thread[%x,%x] exit / process %x / vseg %s / base %x / cycle %d\n",
[611]	1280	__FUNCTION__, this->process->pid, this->trdid, pid, vseg_type_str(vseg->type), vaddr, cycle );
[433]	1281	#endif
	1282
[611]	1283	} // end vmm_delete_vseg()
[1]	1284
[611]	1285	/////////////////////////////////////////////
	1286	vseg_t * vmm_vseg_from_vaddr( vmm_t * vmm,
	1287	intptr_t vaddr )
[406]	1288	{
[408]	1289	xptr_t iter_xp;
	1290	xptr_t vseg_xp;
	1291	vseg_t * vseg;
[406]	1292
[408]	1293	// get extended pointers on VSL lock and root
	1294	xptr_t lock_xp = XPTR( local_cxy , &vmm->vsegs_lock );
	1295	xptr_t root_xp = XPTR( local_cxy , &vmm->vsegs_root );
[406]	1296
[408]	1297	// get lock protecting the VSL
[567]	1298	remote_rwlock_rd_acquire( lock_xp );
[408]	1299
	1300	// scan the list of vsegs in VSL
	1301	XLIST_FOREACH( root_xp , iter_xp )
[406]	1302	{
[408]	1303	vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist );
[433]	1304	vseg = GET_PTR( vseg_xp );
[595]	1305
[408]	1306	if( (vaddr >= vseg->min) && (vaddr < vseg->max) )
[595]	1307	{
[408]	1308	// return success
[567]	1309	remote_rwlock_rd_release( lock_xp );
[408]	1310	return vseg;
	1311	}
[406]	1312	}
	1313
[408]	1314	// return failure
[567]	1315	remote_rwlock_rd_release( lock_xp );
[408]	1316	return NULL;
[406]	1317
[595]	1318	} // end vmm_vseg_from_vaddr()
[406]	1319
[1]	1320	/////////////////////////////////////////////
	1321	error_t vmm_resize_vseg( process_t * process,
	1322	intptr_t base,
	1323	intptr_t size )
	1324	{
[406]	1325	error_t error;
	1326	vseg_t * new;
	1327	vpn_t vpn_min;
	1328	vpn_t vpn_max;
[1]	1329
	1330	// get pointer on process VMM
	1331	vmm_t * vmm = &process->vmm;
	1332
	1333	intptr_t addr_min = base;
	1334	intptr_t addr_max = base + size;
	1335
	1336	// get pointer on vseg
[595]	1337	vseg_t * vseg = vmm_vseg_from_vaddr( vmm , base );
[1]	1338
	1339	if( vseg == NULL) return EINVAL;
[21]	1340
[408]	1341	// get extended pointer on VSL lock
	1342	xptr_t lock_xp = XPTR( local_cxy , &vmm->vsegs_lock );
[21]	1343
[408]	1344	// get lock protecting VSL
[567]	1345	remote_rwlock_wr_acquire( lock_xp );
[408]	1346
[611]	1347	if( (vseg->min > addr_min) \|\| (vseg->max < addr_max) ) // not included in vseg
[1]	1348	{
[611]	1349	error = -1;
[1]	1350	}
[611]	1351	else if( (vseg->min == addr_min) && (vseg->max == addr_max) ) // vseg must be deleted
[1]	1352	{
[611]	1353	vmm_delete_vseg( process->pid , vseg->min );
[1]	1354	error = 0;
	1355	}
[611]	1356	else if( vseg->min == addr_min ) // vseg must be resized
[1]	1357	{
[406]	1358	// update vseg base address
	1359	vseg->min = addr_max;
	1360
	1361	// update vpn_base and vpn_size
	1362	vpn_min = vseg->min >> CONFIG_PPM_PAGE_SHIFT;
	1363	vpn_max = (vseg->max - 1) >> CONFIG_PPM_PAGE_SHIFT;
	1364	vseg->vpn_base = vpn_min;
	1365	vseg->vpn_size = vpn_max - vpn_min + 1;
	1366	error = 0;
[1]	1367	}
[611]	1368	else if( vseg->max == addr_max ) // vseg must be resized
[1]	1369	{
[406]	1370	// update vseg max address
	1371	vseg->max = addr_min;
	1372
	1373	// update vpn_base and vpn_size
	1374	vpn_min = vseg->min >> CONFIG_PPM_PAGE_SHIFT;
	1375	vpn_max = (vseg->max - 1) >> CONFIG_PPM_PAGE_SHIFT;
	1376	vseg->vpn_base = vpn_min;
	1377	vseg->vpn_size = vpn_max - vpn_min + 1;
	1378	error = 0;
[1]	1379	}
[611]	1380	else // vseg cut in three regions
[1]	1381	{
[406]	1382	// resize existing vseg
	1383	vseg->max = addr_min;
	1384
	1385	// update vpn_base and vpn_size
	1386	vpn_min = vseg->min >> CONFIG_PPM_PAGE_SHIFT;
	1387	vpn_max = (vseg->max - 1) >> CONFIG_PPM_PAGE_SHIFT;
	1388	vseg->vpn_base = vpn_min;
	1389	vseg->vpn_size = vpn_max - vpn_min + 1;
	1390
	1391	// create new vseg
[407]	1392	new = vmm_create_vseg( process,
	1393	vseg->type,
	1394	addr_min,
	1395	(vseg->max - addr_max),
	1396	vseg->file_offset,
	1397	vseg->file_size,
	1398	vseg->mapper_xp,
	1399	vseg->cxy );
	1400
[406]	1401	if( new == NULL ) error = EINVAL;
	1402	else error = 0;
[1]	1403	}
	1404
	1405	// release VMM lock
[567]	1406	remote_rwlock_wr_release( lock_xp );
[1]	1407
	1408	return error;
	1409
[406]	1410	} // vmm_resize_vseg()
	1411
[1]	1412	///////////////////////////////////////////
[388]	1413	error_t vmm_get_vseg( process_t * process,
[394]	1414	intptr_t vaddr,
[388]	1415	vseg_t ** found_vseg )
[1]	1416	{
[595]	1417	xptr_t vseg_xp;
	1418	vseg_t * vseg;
	1419	vmm_t * vmm;
	1420	error_t error;
[1]	1421
[440]	1422	// get pointer on local VMM
	1423	vmm = &process->vmm;
[1]	1424
[440]	1425	// try to get vseg from local VMM
[595]	1426	vseg = vmm_vseg_from_vaddr( vmm , vaddr );
[440]	1427
[388]	1428	if( vseg == NULL ) // vseg not found in local cluster => try to get it from ref
	1429	{
	1430	// get extended pointer on reference process
	1431	xptr_t ref_xp = process->ref_xp;
[1]	1432
[388]	1433	// get cluster and local pointer on reference process
	1434	cxy_t ref_cxy = GET_CXY( ref_xp );
[433]	1435	process_t * ref_ptr = GET_PTR( ref_xp );
[388]	1436
	1437	if( local_cxy == ref_cxy ) return -1; // local cluster is the reference
	1438
	1439	// get extended pointer on reference vseg
[394]	1440	rpc_vmm_get_vseg_client( ref_cxy , ref_ptr , vaddr , &vseg_xp , &error );
[388]	1441
[440]	1442	if( error ) return -1; // vseg not found => illegal user vaddr
[388]	1443
	1444	// allocate a vseg in local cluster
	1445	vseg = vseg_alloc();
	1446
[440]	1447	if( vseg == NULL ) return -1; // cannot allocate a local vseg
[388]	1448
	1449	// initialise local vseg from reference
	1450	vseg_init_from_ref( vseg , vseg_xp );
	1451
[611]	1452	// register local vseg in local VSL
	1453	vmm_attach_vseg_to_vsl( vmm , vseg );
[388]	1454	}
[595]	1455
[388]	1456	// success
	1457	*found_vseg = vseg;
[394]	1458	return 0;
[388]	1459
	1460	} // end vmm_get_vseg()
	1461
[407]	1462	//////////////////////////////////////////////////////////////////////////////////////
	1463	// This static function compute the target cluster to allocate a physical page
	1464	// for a given <vpn> in a given <vseg>, allocates the page (with an RPC if required)
	1465	// and returns an extended pointer on the allocated page descriptor.
[585]	1466	// It can be called by a thread running in any cluster.
[407]	1467	// The vseg cannot have the FILE type.
	1468	//////////////////////////////////////////////////////////////////////////////////////
	1469	static xptr_t vmm_page_allocate( vseg_t * vseg,
	1470	vpn_t vpn )
	1471	{
[433]	1472
[438]	1473	#if DEBUG_VMM_ALLOCATE_PAGE
[595]	1474	uint32_t cycle = (uint32_t)hal_get_cycles();
	1475	thread_t * this = CURRENT_THREAD;
[438]	1476	if( DEBUG_VMM_ALLOCATE_PAGE < (uint32_t)hal_get_cycles() )
[595]	1477	printk("\n[%s] thread[%x,%x] enter for vpn %x / cycle %d\n",
	1478	__FUNCTION__ , this->process->pid, this->trdid, vpn, cycle );
[433]	1479	#endif
	1480
[407]	1481	page_t * page_ptr;
	1482	cxy_t page_cxy;
	1483	kmem_req_t req;
[577]	1484	uint32_t index;
[407]	1485
[577]	1486	uint32_t type = vseg->type;
	1487	uint32_t flags = vseg->flags;
	1488	uint32_t x_size = LOCAL_CLUSTER->x_size;
	1489	uint32_t y_size = LOCAL_CLUSTER->y_size;
[407]	1490
[567]	1491	// check vseg type
	1492	assert( ( type != VSEG_TYPE_FILE ) , "illegal vseg type\n" );
[407]	1493
	1494	if( flags & VSEG_DISTRIB ) // distributed => cxy depends on vpn LSB
	1495	{
[577]	1496	index = vpn & ((x_size * y_size) - 1);
	1497	page_cxy = HAL_CXY_FROM_XY( (index / y_size) , (index % y_size) );
[561]	1498
[577]	1499	// If the cluster selected from VPN's LSBs is empty, we select one randomly
	1500	if ( cluster_is_active( page_cxy ) == false )
	1501	{
	1502	page_cxy = cluster_random_select();
[561]	1503	}
[407]	1504	}
	1505	else // other cases => cxy specified in vseg
	1506	{
[561]	1507	page_cxy = vseg->cxy;
[407]	1508	}
	1509
	1510	// allocate a physical page from target cluster
	1511	if( page_cxy == local_cxy ) // target cluster is the local cluster
	1512	{
	1513	req.type = KMEM_PAGE;
	1514	req.size = 0;
	1515	req.flags = AF_NONE;
	1516	page_ptr = (page_t *)kmem_alloc( &req );
	1517	}
	1518	else // target cluster is not the local cluster
	1519	{
	1520	rpc_pmem_get_pages_client( page_cxy , 0 , &page_ptr );
	1521	}
	1522
[438]	1523	#if DEBUG_VMM_ALLOCATE_PAGE
[595]	1524	cycle = (uint32_t)hal_get_cycles();
[438]	1525	if( DEBUG_VMM_ALLOCATE_PAGE < (uint32_t)hal_get_cycles() )
[595]	1526	printk("\n[%s] thread[%x,%x] exit for vpn %x / ppn %x / cycle %d\n",
	1527	__FUNCTION__ , this->process->pid, this->trdid, vpn,
	1528	ppm_page2ppn( XPTR( page_cxy , page_ptr ) , cycle );
[433]	1529	#endif
	1530
[407]	1531	if( page_ptr == NULL ) return XPTR_NULL;
	1532	else return XPTR( page_cxy , page_ptr );
	1533
	1534	} // end vmm_page_allocate()
	1535
[313]	1536	////////////////////////////////////////
	1537	error_t vmm_get_one_ppn( vseg_t * vseg,
	1538	vpn_t vpn,
	1539	ppn_t * ppn )
	1540	{
	1541	error_t error;
[407]	1542	xptr_t page_xp; // extended pointer on physical page descriptor
[606]	1543	uint32_t page_id; // missing page index in vseg mapper
[406]	1544	uint32_t type; // vseg type;
[313]	1545
[406]	1546	type = vseg->type;
[606]	1547	page_id = vpn - vseg->vpn_base;
[313]	1548
[438]	1549	#if DEBUG_VMM_GET_ONE_PPN
[595]	1550	uint32_t cycle = (uint32_t)hal_get_cycles();
	1551	thread_t * this = CURRENT_THREAD;
	1552	if( DEBUG_VMM_GET_ONE_PPN < cycle )
[606]	1553	printk("\n[%s] thread[%x,%x] enter for vpn %x / type %s / page_id %d / cycle %d\n",
	1554	__FUNCTION__, this->process->pid, this->trdid, vpn, vseg_type_str(type), page_id, cycle );
[433]	1555	#endif
[313]	1556
[406]	1557	// FILE type : get the physical page from the file mapper
[313]	1558	if( type == VSEG_TYPE_FILE )
	1559	{
[406]	1560	// get extended pointer on mapper
[407]	1561	xptr_t mapper_xp = vseg->mapper_xp;
[313]	1562
[567]	1563	assert( (mapper_xp != XPTR_NULL),
	1564	"mapper not defined for a FILE vseg\n" );
[406]	1565
[606]	1566	// get extended pointer on page descriptor
	1567	page_xp = mapper_remote_get_page( mapper_xp , page_id );
[406]	1568
[606]	1569	if ( page_xp == XPTR_NULL ) return EINVAL;
[313]	1570	}
	1571
[406]	1572	// Other types : allocate a physical page from target cluster,
[407]	1573	// as defined by vseg type and vpn value
[313]	1574	else
	1575	{
[433]	1576	// allocate one physical page
[407]	1577	page_xp = vmm_page_allocate( vseg , vpn );
[406]	1578
[407]	1579	if( page_xp == XPTR_NULL ) return ENOMEM;
[313]	1580
[406]	1581	// initialise missing page from .elf file mapper for DATA and CODE types
[440]	1582	// the vseg->mapper_xp field is an extended pointer on the .elf file mapper
[313]	1583	if( (type == VSEG_TYPE_CODE) \|\| (type == VSEG_TYPE_DATA) )
	1584	{
[406]	1585	// get extended pointer on mapper
	1586	xptr_t mapper_xp = vseg->mapper_xp;
[313]	1587
[567]	1588	assert( (mapper_xp != XPTR_NULL),
	1589	"mapper not defined for a CODE or DATA vseg\n" );
[406]	1590
	1591	// compute missing page offset in vseg
[606]	1592	uint32_t offset = page_id << CONFIG_PPM_PAGE_SHIFT;
[406]	1593
[313]	1594	// compute missing page offset in .elf file
[406]	1595	uint32_t elf_offset = vseg->file_offset + offset;
[313]	1596
[438]	1597	#if (DEBUG_VMM_GET_ONE_PPN & 0x1)
[469]	1598	if( DEBUG_VMM_GET_ONE_PPN < (uint32_t)hal_get_cycles() )
[595]	1599	printk("\n[%s] thread[%x,%x] for vpn = %x / elf_offset = %x\n",
	1600	__FUNCTION__, this->process->pid, this->trdid, vpn, elf_offset );
[433]	1601	#endif
[406]	1602	// compute extended pointer on page base
[407]	1603	xptr_t base_xp = ppm_page2base( page_xp );
[313]	1604
[406]	1605	// file_size (in .elf mapper) can be smaller than vseg_size (BSS)
	1606	uint32_t file_size = vseg->file_size;
	1607
	1608	if( file_size < offset ) // missing page fully in BSS
[313]	1609	{
[406]	1610
[438]	1611	#if (DEBUG_VMM_GET_ONE_PPN & 0x1)
[469]	1612	if( DEBUG_VMM_GET_ONE_PPN < (uint32_t)hal_get_cycles() )
[595]	1613	printk("\n[%s] thread[%x,%x] for vpn %x / fully in BSS\n",
	1614	__FUNCTION__, this->process->pid, this->trdid, vpn );
[433]	1615	#endif
[407]	1616	if( GET_CXY( page_xp ) == local_cxy )
[313]	1617	{
[315]	1618	memset( GET_PTR( base_xp ) , 0 , CONFIG_PPM_PAGE_SIZE );
[313]	1619	}
	1620	else
	1621	{
[315]	1622	hal_remote_memset( base_xp , 0 , CONFIG_PPM_PAGE_SIZE );
[313]	1623	}
	1624	}
[406]	1625	else if( file_size >= (offset + CONFIG_PPM_PAGE_SIZE) ) // fully in mapper
[315]	1626	{
[406]	1627
[438]	1628	#if (DEBUG_VMM_GET_ONE_PPN & 0x1)
[469]	1629	if( DEBUG_VMM_GET_ONE_PPN < (uint32_t)hal_get_cycles() )
[595]	1630	printk("\n[%s] thread[%x,%x] for vpn %x / fully in mapper\n",
	1631	__FUNCTION__, this->process->pid, this->trdid, vpn );
[433]	1632	#endif
[606]	1633	error = mapper_move_kernel( mapper_xp,
	1634	true, // to_buffer
	1635	elf_offset,
	1636	base_xp,
	1637	CONFIG_PPM_PAGE_SIZE );
[313]	1638	if( error ) return EINVAL;
	1639	}
[406]	1640	else // both in mapper and in BSS :
	1641	// - (file_size - offset) bytes from mapper
	1642	// - (page_size + offset - file_size) bytes from BSS
[313]	1643	{
[406]	1644
[438]	1645	#if (DEBUG_VMM_GET_ONE_PPN & 0x1)
[469]	1646	if( DEBUG_VMM_GET_ONE_PPN < (uint32_t)hal_get_cycles() )
[610]	1647	printk("\n[%s] thread[%x,%x] for vpn %x / both mapper & BSS\n"
[433]	1648	" %d bytes from mapper / %d bytes from BSS\n",
[595]	1649	__FUNCTION__, this->process->pid, this->trdid, vpn,
[407]	1650	file_size - offset , offset + CONFIG_PPM_PAGE_SIZE - file_size );
[433]	1651	#endif
[313]	1652	// initialize mapper part
[606]	1653	error = mapper_move_kernel( mapper_xp,
	1654	true, // to buffer
	1655	elf_offset,
	1656	base_xp,
	1657	file_size - offset );
[313]	1658	if( error ) return EINVAL;
	1659
	1660	// initialize BSS part
[407]	1661	if( GET_CXY( page_xp ) == local_cxy )
[313]	1662	{
[406]	1663	memset( GET_PTR( base_xp ) + file_size - offset , 0 ,
	1664	offset + CONFIG_PPM_PAGE_SIZE - file_size );
[313]	1665	}
	1666	else
	1667	{
[406]	1668	hal_remote_memset( base_xp + file_size - offset , 0 ,
	1669	offset + CONFIG_PPM_PAGE_SIZE - file_size );
[313]	1670	}
	1671	}
	1672	} // end initialisation for CODE or DATA types
	1673	}
	1674
	1675	// return ppn
[407]	1676	*ppn = ppm_page2ppn( page_xp );
[406]	1677
[438]	1678	#if DEBUG_VMM_GET_ONE_PPN
[595]	1679	cycle = (uint32_t)hal_get_cycles();
	1680	if( DEBUG_VMM_GET_ONE_PPN < cycle )
	1681	printk("\n[%s] thread[%x,%x] exit for vpn %x / ppn %x / cycle\n",
	1682	__FUNCTION__ , this->process->pid, this->trdid , vpn , *ppn, cycle );
[433]	1683	#endif
[406]	1684
[313]	1685	return 0;
	1686
	1687	} // end vmm_get_one_ppn()
	1688
[585]	1689	///////////////////////////////////////////////////
	1690	error_t vmm_handle_page_fault( process_t * process,
	1691	vpn_t vpn )
[1]	1692	{
[585]	1693	vseg_t * vseg; // vseg containing vpn
	1694	uint32_t new_attr; // new PTE_ATTR value
	1695	ppn_t new_ppn; // new PTE_PPN value
	1696	uint32_t ref_attr; // PTE_ATTR value in reference GPT
	1697	ppn_t ref_ppn; // PTE_PPN value in reference GPT
	1698	cxy_t ref_cxy; // reference cluster for missing vpn
	1699	process_t * ref_ptr; // reference process for missing vpn
	1700	xptr_t local_gpt_xp; // extended pointer on local GPT
	1701	xptr_t local_lock_xp; // extended pointer on local GPT lock
	1702	xptr_t ref_gpt_xp; // extended pointer on reference GPT
	1703	xptr_t ref_lock_xp; // extended pointer on reference GPT lock
	1704	error_t error; // value returned by called functions
[1]	1705
[585]	1706	// get local vseg (access to reference VSL can be required)
	1707	error = vmm_get_vseg( process,
	1708	(intptr_t)vpn<<CONFIG_PPM_PAGE_SHIFT,
	1709	&vseg );
	1710	if( error )
	1711	{
[595]	1712	printk("\n[ERROR] in %s : vpn %x in process %x not in a registered vseg\n",
[585]	1713	__FUNCTION__ , vpn , process->pid );
	1714
	1715	return EXCP_USER_ERROR;
	1716	}
	1717
	1718	#if DEBUG_VMM_HANDLE_PAGE_FAULT
	1719	uint32_t cycle = (uint32_t)hal_get_cycles();
[567]	1720	thread_t * this = CURRENT_THREAD;
[585]	1721	if( DEBUG_VMM_HANDLE_PAGE_FAULT < cycle )
[595]	1722	printk("\n[%s] threadr[%x,%x] enter for vpn %x / %s / cycle %d\n",
[585]	1723	__FUNCTION__, this->process->pid, this->trdid, vpn, vseg_type_str(vseg->type), cycle );
[433]	1724	#endif
[406]	1725
[585]	1726	//////////////// private vseg => access only the local GPT
	1727	if( (vseg->type == VSEG_TYPE_STACK) \|\| (vseg->type == VSEG_TYPE_CODE) )
[438]	1728	{
[585]	1729	// build extended pointer on local GPT and local GPT lock
	1730	local_gpt_xp = XPTR( local_cxy , &process->vmm.gpt );
	1731	local_lock_xp = XPTR( local_cxy , &process->vmm.gpt_lock );
[407]	1732
[585]	1733	// take local GPT lock in write mode
	1734	remote_rwlock_wr_acquire( local_lock_xp );
[407]	1735
[585]	1736	// check VPN still unmapped in local GPT
[595]	1737
[585]	1738	// do nothing if VPN has been mapped by a a concurrent page_fault
	1739	hal_gpt_get_pte( local_gpt_xp,
	1740	vpn,
	1741	&new_attr,
	1742	&new_ppn );
[407]	1743
[585]	1744	if( (new_attr & GPT_MAPPED) == 0 ) // VPN still unmapped
	1745	{
	1746	// allocate and initialise a physical page depending on the vseg type
	1747	error = vmm_get_one_ppn( vseg , vpn , &new_ppn );
[407]	1748
[585]	1749	if( error )
[408]	1750	{
	1751	printk("\n[ERROR] in %s : no memory / process = %x / vpn = %x\n",
	1752	__FUNCTION__ , process->pid , vpn );
[1]	1753
[585]	1754	// release local GPT lock in write mode
	1755	remote_rwlock_wr_release( local_lock_xp );
[406]	1756
[585]	1757	return EXCP_KERNEL_PANIC;
[407]	1758	}
	1759
[408]	1760	// define new_attr from vseg flags
[407]	1761	new_attr = GPT_MAPPED \| GPT_SMALL;
	1762	if( vseg->flags & VSEG_USER ) new_attr \|= GPT_USER;
	1763	if( vseg->flags & VSEG_WRITE ) new_attr \|= GPT_WRITABLE;
	1764	if( vseg->flags & VSEG_EXEC ) new_attr \|= GPT_EXECUTABLE;
	1765	if( vseg->flags & VSEG_CACHE ) new_attr \|= GPT_CACHABLE;
	1766
[585]	1767	// set PTE (PPN & attribute) to local GPT
	1768	error = hal_gpt_set_pte( local_gpt_xp,
[408]	1769	vpn,
	1770	new_attr,
	1771	new_ppn );
[585]	1772	if ( error )
[407]	1773	{
[585]	1774	printk("\n[ERROR] in %s : cannot update local GPT / process %x / vpn = %x\n",
[407]	1775	__FUNCTION__ , process->pid , vpn );
[585]	1776
	1777	// release local GPT lock in write mode
	1778	remote_rwlock_wr_release( local_lock_xp );
	1779
	1780	return EXCP_KERNEL_PANIC;
[407]	1781	}
	1782	}
[585]	1783
	1784	// release local GPT lock in write mode
	1785	remote_rwlock_wr_release( local_lock_xp );
	1786
	1787	#if DEBUG_VMM_HANDLE_PAGE_FAULT
	1788	cycle = (uint32_t)hal_get_cycles();
	1789	if( DEBUG_VMM_HANDLE_PAGE_FAULT < cycle )
[595]	1790	printk("\n[%s] private page fault handled / vpn %x / ppn %x / attr %x / cycle %d\n",
[585]	1791	__FUNCTION__, vpn, new_ppn, new_attr, cycle );
	1792	#endif
	1793	return EXCP_NON_FATAL;
	1794
	1795	} // end local GPT access
	1796
	1797	//////////// public vseg => access reference GPT
	1798	else
	1799	{
	1800	// get reference process cluster and local pointer
	1801	ref_cxy = GET_CXY( process->ref_xp );
	1802	ref_ptr = GET_PTR( process->ref_xp );
	1803
	1804	// build extended pointer on reference GPT and reference GPT lock
	1805	ref_gpt_xp = XPTR( ref_cxy , &ref_ptr->vmm.gpt );
	1806	ref_lock_xp = XPTR( ref_cxy , &ref_ptr->vmm.gpt_lock );
	1807
	1808	// build extended pointer on local GPT and local GPT lock
	1809	local_gpt_xp = XPTR( local_cxy , &process->vmm.gpt );
	1810	local_lock_xp = XPTR( local_cxy , &process->vmm.gpt_lock );
	1811
	1812	// take reference GPT lock in read mode
	1813	remote_rwlock_rd_acquire( ref_lock_xp );
	1814
	1815	// get directly PPN & attributes from reference GPT
	1816	// this can avoids a costly RPC for a false page fault
	1817	hal_gpt_get_pte( ref_gpt_xp,
	1818	vpn,
	1819	&ref_attr,
	1820	&ref_ppn );
	1821
	1822	// release reference GPT lock in read mode
	1823	remote_rwlock_rd_release( ref_lock_xp );
	1824
	1825	if( ref_attr & GPT_MAPPED ) // false page fault => update local GPT
[1]	1826	{
[585]	1827	// take local GPT lock in write mode
	1828	remote_rwlock_wr_acquire( local_lock_xp );
	1829
	1830	// check VPN still unmapped in local GPT
	1831	hal_gpt_get_pte( local_gpt_xp,
	1832	vpn,
	1833	&new_attr,
	1834	&new_ppn );
[1]	1835
[585]	1836	if( (new_attr & GPT_MAPPED) == 0 ) // VPN still unmapped
	1837	{
	1838	// update local GPT from reference GPT
	1839	error = hal_gpt_set_pte( local_gpt_xp,
	1840	vpn,
	1841	ref_attr,
	1842	ref_ppn );
	1843	if( error )
	1844	{
[595]	1845	printk("\n[ERROR] in %s : cannot update local GPT / process %x / vpn %x\n",
[585]	1846	__FUNCTION__ , process->pid , vpn );
	1847
	1848	// release local GPT lock in write mode
	1849	remote_rwlock_wr_release( local_lock_xp );
	1850
	1851	return EXCP_KERNEL_PANIC;
	1852	}
	1853	}
	1854	else // VPN has been mapped by a a concurrent page_fault
	1855	{
	1856	// keep PTE from local GPT
	1857	ref_attr = new_attr;
	1858	ref_ppn = new_ppn;
	1859	}
	1860
	1861	// release local GPT lock in write mode
	1862	remote_rwlock_wr_release( local_lock_xp );
	1863
	1864	#if DEBUG_VMM_HANDLE_PAGE_FAULT
[433]	1865	cycle = (uint32_t)hal_get_cycles();
[585]	1866	if( DEBUG_VMM_HANDLE_PAGE_FAULT < cycle )
[595]	1867	printk("\n[%s] false page fault handled / vpn %x / ppn %x / attr %x / cycle %d\n",
[585]	1868	__FUNCTION__, vpn, ref_ppn, ref_attr, cycle );
[433]	1869	#endif
[585]	1870	return EXCP_NON_FATAL;
	1871	}
	1872	else // true page fault => update reference GPT
	1873	{
	1874	// take reference GPT lock in write mode
	1875	remote_rwlock_wr_acquire( ref_lock_xp );
	1876
	1877	// check VPN still unmapped in reference GPT
	1878	// do nothing if VPN has been mapped by a a concurrent page_fault
	1879	hal_gpt_get_pte( ref_gpt_xp,
	1880	vpn,
	1881	&ref_attr,
	1882	&ref_ppn );
[406]	1883
[585]	1884	if( (ref_attr & GPT_MAPPED) == 0 ) // VPN actually unmapped
	1885	{
	1886	// allocate and initialise a physical page depending on the vseg type
	1887	error = vmm_get_one_ppn( vseg , vpn , &new_ppn );
[1]	1888
[585]	1889	if( error )
	1890	{
	1891	printk("\n[ERROR] in %s : no memory / process = %x / vpn = %x\n",
	1892	__FUNCTION__ , process->pid , vpn );
[313]	1893
[585]	1894	// release reference GPT lock in write mode
	1895	remote_rwlock_wr_release( ref_lock_xp );
	1896
	1897	return EXCP_KERNEL_PANIC;
	1898	}
[1]	1899
[585]	1900	// define new_attr from vseg flags
	1901	new_attr = GPT_MAPPED \| GPT_SMALL;
	1902	if( vseg->flags & VSEG_USER ) new_attr \|= GPT_USER;
	1903	if( vseg->flags & VSEG_WRITE ) new_attr \|= GPT_WRITABLE;
	1904	if( vseg->flags & VSEG_EXEC ) new_attr \|= GPT_EXECUTABLE;
	1905	if( vseg->flags & VSEG_CACHE ) new_attr \|= GPT_CACHABLE;
[440]	1906
[585]	1907	// update reference GPT
	1908	error = hal_gpt_set_pte( ref_gpt_xp,
	1909	vpn,
	1910	new_attr,
	1911	new_ppn );
	1912
	1913	// update local GPT (protected by reference GPT lock)
	1914	error \|= hal_gpt_set_pte( local_gpt_xp,
	1915	vpn,
	1916	new_attr,
	1917	new_ppn );
	1918
	1919	if( error )
	1920	{
	1921	printk("\n[ERROR] in %s : cannot update GPT / process %x / vpn = %x\n",
	1922	__FUNCTION__ , process->pid , vpn );
	1923
	1924	// release reference GPT lock in write mode
	1925	remote_rwlock_wr_release( ref_lock_xp );
	1926
	1927	return EXCP_KERNEL_PANIC;
	1928	}
	1929	}
	1930
	1931	// release reference GPT lock in write mode
	1932	remote_rwlock_wr_release( ref_lock_xp );
	1933
[440]	1934	#if DEBUG_VMM_HANDLE_PAGE_FAULT
[585]	1935	cycle = (uint32_t)hal_get_cycles();
[469]	1936	if( DEBUG_VMM_HANDLE_PAGE_FAULT < cycle )
[595]	1937	printk("\n[%s] true page fault handled / vpn %x / ppn %x / attr %x / cycle %d\n",
[585]	1938	__FUNCTION__, vpn, new_ppn, new_attr, cycle );
[435]	1939	#endif
[585]	1940	return EXCP_NON_FATAL;
	1941	}
	1942	}
	1943	} // end vmm_handle_page_fault()
[435]	1944
[585]	1945	////////////////////////////////////////////
	1946	error_t vmm_handle_cow( process_t * process,
	1947	vpn_t vpn )
	1948	{
	1949	vseg_t * vseg; // vseg containing vpn
	1950	cxy_t ref_cxy; // reference cluster for missing vpn
	1951	process_t * ref_ptr; // reference process for missing vpn
	1952	xptr_t gpt_xp; // extended pointer on GPT
	1953	xptr_t gpt_lock_xp; // extended pointer on GPT lock
	1954	uint32_t old_attr; // current PTE_ATTR value
	1955	ppn_t old_ppn; // current PTE_PPN value
	1956	uint32_t new_attr; // new PTE_ATTR value
	1957	ppn_t new_ppn; // new PTE_PPN value
	1958	error_t error;
[1]	1959
[585]	1960	#if DEBUG_VMM_HANDLE_COW
	1961	uint32_t cycle = (uint32_t)hal_get_cycles();
	1962	thread_t * this = CURRENT_THREAD;
	1963	if( DEBUG_VMM_HANDLE_COW < cycle )
[595]	1964	printk("\n[%s] thread[%x,%x] enter for vpn %x / core[%x,%d] / cycle %d\n",
[585]	1965	__FUNCTION__, process->pid, this->trdid, vpn, local_cxy, this->core->lid, cycle );
	1966	#endif
	1967
[610]	1968	// access local GPT to get GPT_COW flag
	1969	bool_t cow = hal_gpt_pte_is_cow( &(process->vmm.gpt), vpn );
	1970
	1971	if( cow == false ) return EXCP_USER_ERROR;
	1972
[585]	1973	// get local vseg
	1974	error = vmm_get_vseg( process,
	1975	(intptr_t)vpn<<CONFIG_PPM_PAGE_SHIFT,
	1976	&vseg );
[440]	1977	if( error )
[1]	1978	{
[595]	1979	printk("\n[PANIC] in %s : vpn %x in process %x not in a registered vseg\n",
[585]	1980	__FUNCTION__, vpn, process->pid );
	1981
	1982	return EXCP_KERNEL_PANIC;
[440]	1983	}
[407]	1984
[585]	1985	// get reference GPT cluster and local pointer
	1986	ref_cxy = GET_CXY( process->ref_xp );
	1987	ref_ptr = GET_PTR( process->ref_xp );
[407]	1988
[610]	1989	// build relevant extended pointers on relevant GPT and GPT lock
[585]	1990	// - access local GPT for a private vseg
	1991	// - access reference GPT for a public vseg
	1992	if( (vseg->type == VSEG_TYPE_STACK) \|\| (vseg->type == VSEG_TYPE_CODE) )
[440]	1993	{
[585]	1994	gpt_xp = XPTR( local_cxy , &process->vmm.gpt );
	1995	gpt_lock_xp = XPTR( local_cxy , &process->vmm.gpt_lock );
[1]	1996	}
[440]	1997	else
[1]	1998	{
[585]	1999	gpt_xp = XPTR( ref_cxy , &ref_ptr->vmm.gpt );
	2000	gpt_lock_xp = XPTR( ref_cxy , &ref_ptr->vmm.gpt_lock );
[1]	2001	}
	2002
[585]	2003	// take GPT lock in write mode
	2004	remote_rwlock_wr_acquire( gpt_lock_xp );
[441]	2005
[585]	2006	// get current PTE from reference GPT
	2007	hal_gpt_get_pte( gpt_xp,
	2008	vpn,
	2009	&old_attr,
	2010	&old_ppn );
[441]	2011
[585]	2012	// the PTE must be mapped for a COW
	2013	if( (old_attr & GPT_MAPPED) == 0 )
	2014	{
	2015	printk("\n[PANIC] in %s : VPN %x in process %x unmapped\n",
	2016	__FUNCTION__, vpn, process->pid );
[407]	2017
[585]	2018	// release GPT lock in write mode
	2019	remote_rwlock_wr_acquire( gpt_lock_xp );
[407]	2020
[585]	2021	return EXCP_KERNEL_PANIC;
[407]	2022	}
	2023
[585]	2024	// get extended pointer, cluster and local pointer on physical page descriptor
	2025	xptr_t page_xp = ppm_ppn2page( old_ppn );
	2026	cxy_t page_cxy = GET_CXY( page_xp );
	2027	page_t * page_ptr = GET_PTR( page_xp );
[435]	2028
[585]	2029	// get extended pointers on forks and lock field in page descriptor
	2030	xptr_t forks_xp = XPTR( page_cxy , &page_ptr->forks );
	2031	xptr_t forks_lock_xp = XPTR( page_cxy , &page_ptr->lock );
[407]	2032
[585]	2033	// take lock protecting "forks" counter
	2034	remote_busylock_acquire( forks_lock_xp );
[407]	2035
[585]	2036	// get number of pending forks from page descriptor
	2037	uint32_t forks = hal_remote_l32( forks_xp );
[441]	2038
[585]	2039	if( forks ) // pending fork => allocate a new page, and copy old to new
	2040	{
	2041	// allocate a new physical page
	2042	page_xp = vmm_page_allocate( vseg , vpn );
	2043	if( page_xp == XPTR_NULL )
	2044	{
	2045	printk("\n[PANIC] in %s : no memory for vpn %x in process %x\n",
	2046	__FUNCTION__ , vpn, process->pid );
[441]	2047
[585]	2048	// release GPT lock in write mode
	2049	remote_rwlock_wr_acquire( gpt_lock_xp );
[441]	2050
[585]	2051	// release lock protecting "forks" counter
	2052	remote_busylock_release( forks_lock_xp );
[441]	2053
[585]	2054	return EXCP_KERNEL_PANIC;
	2055	}
[441]	2056
[585]	2057	// compute allocated page PPN
	2058	new_ppn = ppm_page2ppn( page_xp );
[441]	2059
[585]	2060	// copy old page content to new page
	2061	xptr_t old_base_xp = ppm_ppn2base( old_ppn );
	2062	xptr_t new_base_xp = ppm_ppn2base( new_ppn );
	2063	memcpy( GET_PTR( new_base_xp ),
	2064	GET_PTR( old_base_xp ),
	2065	CONFIG_PPM_PAGE_SIZE );
[441]	2066
[585]	2067	// decrement pending forks counter in page descriptor
	2068	hal_remote_atomic_add( forks_xp , -1 );
[441]	2069
[585]	2070	#if(DEBUG_VMM_HANDLE_COW & 1)
	2071	if( DEBUG_VMM_HANDLE_COW < cycle )
[595]	2072	printk("\n[%s] thread[%x,%x] : pending forks => allocate a new PPN %x\n",
[585]	2073	__FUNCTION__, process->pid, this->trdid, new_ppn );
	2074	#endif
[440]	2075
[585]	2076	}
	2077	else // no pending fork => keep the existing page
	2078	{
[1]	2079
[585]	2080	#if(DEBUG_VMM_HANDLE_COW & 1)
	2081	if( DEBUG_VMM_HANDLE_COW < cycle )
[595]	2082	printk("\n[%s] thread[%x,%x] no pending forks => keep existing PPN %x\n",
[585]	2083	__FUNCTION__, process->pid, this->trdid, new_ppn );
	2084	#endif
	2085	new_ppn = old_ppn;
	2086	}
[1]	2087
[585]	2088	// release lock protecting "forks" counter
	2089	remote_busylock_release( forks_lock_xp );
	2090
	2091	// build new_attr : reset COW and set WRITABLE,
	2092	new_attr = (old_attr \| GPT_WRITABLE) & (~GPT_COW);
	2093
	2094	// update the relevan GPT
	2095	// - private vseg => update local GPT
	2096	// - public vseg => update all GPT copies
	2097	if( (vseg->type == VSEG_TYPE_STACK) \|\| (vseg->type == VSEG_TYPE_CODE) )
[1]	2098	{
[585]	2099	hal_gpt_set_pte( gpt_xp,
	2100	vpn,
	2101	new_attr,
	2102	new_ppn );
[1]	2103	}
[585]	2104	else
[1]	2105	{
[585]	2106	if( ref_cxy == local_cxy ) // reference cluster is local
	2107	{
	2108	vmm_global_update_pte( process,
	2109	vpn,
	2110	new_attr,
	2111	new_ppn );
	2112	}
	2113	else // reference cluster is remote
	2114	{
	2115	rpc_vmm_global_update_pte_client( ref_cxy,
	2116	ref_ptr,
	2117	vpn,
	2118	new_attr,
	2119	new_ppn );
	2120	}
[1]	2121	}
	2122
[585]	2123	// release GPT lock in write mode
	2124	remote_rwlock_wr_release( gpt_lock_xp );
[21]	2125
[585]	2126	#if DEBUG_VMM_HANDLE_COW
	2127	cycle = (uint32_t)hal_get_cycles();
	2128	if( DEBUG_VMM_HANDLE_COW < cycle )
[595]	2129	printk("\n[%s] thread[%x,%x] exit for vpn %x / core[%x,%d] / cycle %d\n",
[585]	2130	__FUNCTION__, process->pid, this->trdid, vpn, local_cxy, this->core->lid, cycle );
	2131	#endif
[313]	2132
[585]	2133	return EXCP_NON_FATAL;
[1]	2134
[585]	2135	} // end vmm_handle_cow()
	2136

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