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source: trunk/kernel/mm/vmm.c @ 618

Last change on this file since 618 was 617, checked in by alain, 5 years ago
cosmetic
File size: 73.4 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
	961	// get lock on mmap allocator
[567]	962	busylock_acquire( &mgr->lock );
[1]	963
	964	// get vseg from zombi_list or from mmap zone
	965	if( list_is_empty( &mgr->zombi_list[index] ) ) // from mmap zone
	966	{
	967	// check overflow
	968	free = mgr->first_free_vpn;
[614]	969	if( (free + size) > mgr->vpn_size ) return -1;
[1]	970
[614]	971	// update MMAP allocator
[1]	972	mgr->first_free_vpn += size;
	973
	974	// compute base
	975	base = free;
	976	}
	977	else // from zombi_list
	978	{
	979	// get pointer on zombi vseg from zombi_list
[408]	980	vseg = LIST_FIRST( &mgr->zombi_list[index] , vseg_t , zlist );
[1]	981
	982	// remove vseg from free-list
[408]	983	list_unlink( &vseg->zlist );
[1]	984
	985	// compute base
	986	base = vseg->vpn_base;
[21]	987	}
	988
[1]	989	// release lock on mmap allocator
[567]	990	busylock_release( &mgr->lock );
[1]	991
[614]	992	#if DEBUG_VMM_MMAP_ALLOC
	993	cycle = (uint32_t)hal_get_cycles();
	994	if( DEBUG_VMM_DESTROY < cycle )
	995	printk("\n[%s] thread[%x,%x] exit / vpn_base %x / vpn_size %x / cycle %d\n",
	996	__FUNCTION__, this->process->pid, this->trdid, base, size, cycle );
	997	#endif
	998
[1]	999	// returns vpn_base, vpn_size
	1000	*vpn_base = base;
	1001	*vpn_size = size;
	1002	return 0;
	1003
[204]	1004	} // end vmm_mmap_alloc()
	1005
[407]	1006	////////////////////////////////////////////////
	1007	vseg_t * vmm_create_vseg( process_t * process,
	1008	vseg_type_t type,
	1009	intptr_t base,
	1010	uint32_t size,
	1011	uint32_t file_offset,
	1012	uint32_t file_size,
	1013	xptr_t mapper_xp,
	1014	cxy_t cxy )
[1]	1015	{
	1016	vseg_t * vseg; // created vseg pointer
[204]	1017	vpn_t vpn_base; // first page index
[595]	1018	vpn_t vpn_size; // number of pages covered by vseg
[1]	1019	error_t error;
	1020
[438]	1021	#if DEBUG_VMM_CREATE_VSEG
[595]	1022	thread_t * this = CURRENT_THREAD;
	1023	uint32_t cycle = (uint32_t)hal_get_cycles();
[438]	1024	if( DEBUG_VMM_CREATE_VSEG < cycle )
[614]	1025	printk("\n[%s] thread[%x,%x] enter for process %x / %s / cxy %x / cycle %d\n",
	1026	__FUNCTION__, this->process->pid, this->trdid, process->pid, vseg_type_str(type), cxy, cycle );
[433]	1027	#endif
[21]	1028
[407]	1029	// get pointer on VMM
	1030	vmm_t * vmm = &process->vmm;
[21]	1031
[204]	1032	// compute base, size, vpn_base, vpn_size, depending on vseg type
[407]	1033	// we use the VMM specific allocators for "stack", "file", "anon", & "remote" vsegs
[595]	1034
[1]	1035	if( type == VSEG_TYPE_STACK )
	1036	{
	1037	// get vpn_base and vpn_size from STACK allocator
	1038	error = vmm_stack_alloc( vmm , &vpn_base , &vpn_size );
	1039	if( error )
	1040	{
[407]	1041	printk("\n[ERROR] in %s : no space for stack vseg / process %x in cluster %x\n",
	1042	__FUNCTION__ , process->pid , local_cxy );
[1]	1043	return NULL;
	1044	}
	1045
	1046	// compute vseg base and size from vpn_base and vpn_size
	1047	base = vpn_base << CONFIG_PPM_PAGE_SHIFT;
	1048	size = vpn_size << CONFIG_PPM_PAGE_SHIFT;
	1049	}
[595]	1050	else if( type == VSEG_TYPE_FILE )
	1051	{
	1052	// compute page index (in mapper) for first byte
	1053	vpn_t vpn_min = file_offset >> CONFIG_PPM_PAGE_SHIFT;
	1054
	1055	// compute page index (in mapper) for last byte
	1056	vpn_t vpn_max = (file_offset + size - 1) >> CONFIG_PPM_PAGE_SHIFT;
	1057
	1058	// compute offset in first page
	1059	uint32_t offset = file_offset & CONFIG_PPM_PAGE_MASK;
	1060
	1061	// compute number of pages required in virtual space
	1062	vpn_t npages = vpn_max - vpn_min + 1;
	1063
	1064	// get vpn_base and vpn_size from MMAP allocator
	1065	error = vmm_mmap_alloc( vmm , npages , &vpn_base , &vpn_size );
	1066	if( error )
	1067	{
	1068	printk("\n[ERROR] in %s : no vspace for mmap vseg / process %x in cluster %x\n",
	1069	__FUNCTION__ , process->pid , local_cxy );
	1070	return NULL;
	1071	}
	1072
	1073	// set the vseg base (not always aligned for FILE)
	1074	base = (vpn_base << CONFIG_PPM_PAGE_SHIFT) + offset;
	1075	}
[21]	1076	else if( (type == VSEG_TYPE_ANON) \|\|
[1]	1077	(type == VSEG_TYPE_REMOTE) )
	1078	{
[595]	1079	// compute number of required pages in virtual space
	1080	vpn_t npages = size >> CONFIG_PPM_PAGE_SHIFT;
	1081	if( size & CONFIG_PPM_PAGE_MASK) npages++;
	1082
[1]	1083	// get vpn_base and vpn_size from MMAP allocator
	1084	error = vmm_mmap_alloc( vmm , npages , &vpn_base , &vpn_size );
	1085	if( error )
	1086	{
	1087	printk("\n[ERROR] in %s : no vspace for mmap vseg / process %x in cluster %x\n",
	1088	__FUNCTION__ , process->pid , local_cxy );
	1089	return NULL;
	1090	}
	1091
[595]	1092	// set vseg base (always aligned for ANON or REMOTE)
[1]	1093	base = vpn_base << CONFIG_PPM_PAGE_SHIFT;
	1094	}
[595]	1095	else // VSEG_TYPE_DATA or VSEG_TYPE_CODE
[1]	1096	{
[204]	1097	uint32_t vpn_min = base >> CONFIG_PPM_PAGE_SHIFT;
	1098	uint32_t vpn_max = (base + size - 1) >> CONFIG_PPM_PAGE_SHIFT;
	1099
	1100	vpn_base = vpn_min;
	1101	vpn_size = vpn_max - vpn_min + 1;
[1]	1102	}
	1103
	1104	// check collisions
	1105	vseg = vmm_check_conflict( process , vpn_base , vpn_size );
	1106	if( vseg != NULL )
	1107	{
[614]	1108	printk("\n[ERROR] in %s for process %x : new vseg [vpn_base %x / vpn_size %x]\n"
	1109	" overlap existing vseg [vpn_base %x / vpn_size %x]\n",
[407]	1110	__FUNCTION__ , process->pid, vpn_base, vpn_size, vseg->vpn_base, vseg->vpn_size );
[1]	1111	return NULL;
	1112	}
	1113
	1114	// allocate physical memory for vseg descriptor
	1115	vseg = vseg_alloc();
	1116	if( vseg == NULL )
	1117	{
	1118	printk("\n[ERROR] in %s for process %x : cannot allocate memory for vseg\n",
[407]	1119	__FUNCTION__ , process->pid );
[1]	1120	return NULL;
	1121	}
	1122
[614]	1123	#if DEBUG_VMM_CREATE_VSEG
	1124	if( DEBUG_VMM_CREATE_VSEG < cycle )
	1125	printk("\n[%s] thread[%x,%x] : base %x / size %x / vpn_base %x / vpn_size %x\n",
	1126	__FUNCTION__, this->process->pid, this->trdid, base, size, vpn_base, vpn_size );
	1127	#endif
	1128
[1]	1129	// initialize vseg descriptor
[407]	1130	vseg_init( vseg,
	1131	type,
	1132	base,
	1133	size,
	1134	vpn_base,
	1135	vpn_size,
	1136	file_offset,
	1137	file_size,
	1138	mapper_xp,
	1139	cxy );
[1]	1140
[408]	1141	// attach vseg to VSL
[611]	1142	vmm_attach_vseg_to_vsl( vmm , vseg );
[1]	1143
[438]	1144	#if DEBUG_VMM_CREATE_VSEG
[433]	1145	cycle = (uint32_t)hal_get_cycles();
[438]	1146	if( DEBUG_VMM_CREATE_VSEG < cycle )
[595]	1147	printk("\n[%s] thread[%x,%x] exit / %s / cxy %x / cycle %d\n",
	1148	__FUNCTION__, this->process->pid, this->trdid, vseg_type_str(type), cxy, cycle );
[433]	1149	#endif
[21]	1150
[1]	1151	return vseg;
	1152
[406]	1153	} // vmm_create_vseg()
	1154
[611]	1155	///////////////////////////////////
	1156	void vmm_delete_vseg( pid_t pid,
	1157	intptr_t vaddr )
[1]	1158	{
[611]	1159	process_t * process; // local pointer on local process
	1160	vmm_t * vmm; // local pointer on local process VMM
	1161	vseg_t * vseg; // local pointer on local vseg containing vaddr
	1162	gpt_t * gpt; // local pointer on local process GPT
[21]	1163	vpn_t vpn; // VPN of current PTE
	1164	vpn_t vpn_min; // VPN of first PTE
[1]	1165	vpn_t vpn_max; // VPN of last PTE (excluded)
[409]	1166	ppn_t ppn; // current PTE ppn value
	1167	uint32_t attr; // current PTE attributes
	1168	kmem_req_t req; // request to release memory
	1169	xptr_t page_xp; // extended pointer on page descriptor
	1170	cxy_t page_cxy; // page descriptor cluster
	1171	page_t * page_ptr; // page descriptor pointer
[433]	1172	xptr_t forks_xp; // extended pointer on pending forks counter
[469]	1173	xptr_t lock_xp; // extended pointer on lock protecting forks counter
	1174	uint32_t forks; // actual number of pendinf forks
[1]	1175
[611]	1176	#if DEBUG_VMM_DELETE_VSEG
[595]	1177	uint32_t cycle = (uint32_t)hal_get_cycles();
	1178	thread_t * this = CURRENT_THREAD;
[611]	1179	if( DEBUG_VMM_DELETE_VSEG < cycle )
	1180	printk("\n[%s] thread[%x,%x] enter / process %x / vaddr %x / cycle %d\n",
	1181	__FUNCTION__, this->process->pid, this->trdid, pid, vaddr, cycle );
[433]	1182	#endif
[409]	1183
[611]	1184	// get local pointer on local process descriptor
	1185	process = cluster_get_local_process_from_pid( pid );
[1]	1186
[611]	1187	if( process == NULL ) return;
	1188
	1189	// get pointers on local process VMM an GPT
	1190	vmm = &process->vmm;
	1191	gpt = &process->vmm.gpt;
	1192
	1193	// get local pointer on vseg containing vaddr
	1194	vseg = vmm_vseg_from_vaddr( vmm , vaddr );
	1195
	1196	if( vseg == NULL ) return;
	1197
	1198	// loop to invalidate all vseg PTEs in GPT
[1]	1199	vpn_min = vseg->vpn_base;
	1200	vpn_max = vpn_min + vseg->vpn_size;
	1201	for( vpn = vpn_min ; vpn < vpn_max ; vpn++ )
	1202	{
[409]	1203	// get GPT entry
[585]	1204	hal_gpt_get_pte( XPTR( local_cxy , gpt ) , vpn , &attr , &ppn );
[409]	1205
	1206	if( attr & GPT_MAPPED ) // entry is mapped
	1207	{
[437]	1208
[611]	1209	#if( DEBUG_VMM_DELETE_VSEG & 1 )
	1210	if( DEBUG_VMM_DELETE_VSEG < cycle )
	1211	printk("- unmap vpn %x / ppn %x / vseg %s \n" , vpn , ppn, vseg_type_str(vseg->type) );
[437]	1212	#endif
	1213
[567]	1214	// check small page
[585]	1215	assert( (attr & GPT_SMALL) , "an user vseg must use small pages" );
[409]	1216
[585]	1217	// unmap GPT entry in local GPT
[409]	1218	hal_gpt_reset_pte( gpt , vpn );
	1219
[433]	1220	// handle pending forks counter if
	1221	// 1) not identity mapped
[567]	1222	// 2) reference cluster
[433]	1223	if( ((vseg->flags & VSEG_IDENT) == 0) &&
	1224	(GET_CXY( process->ref_xp ) == local_cxy) )
[409]	1225	{
[433]	1226	// get extended pointer on physical page descriptor
[409]	1227	page_xp = ppm_ppn2page( ppn );
	1228	page_cxy = GET_CXY( page_xp );
[433]	1229	page_ptr = GET_PTR( page_xp );
[409]	1230
[469]	1231	// get extended pointers on forks and lock fields
	1232	forks_xp = XPTR( page_cxy , &page_ptr->forks );
	1233	lock_xp = XPTR( page_cxy , &page_ptr->lock );
[433]	1234
	1235	// get pending forks counter
[567]	1236	forks = hal_remote_l32( forks_xp );
[433]	1237
[469]	1238	if( forks ) // decrement pending forks counter
[409]	1239	{
[433]	1240	hal_remote_atomic_add( forks_xp , -1 );
	1241	}
	1242	else // release physical page to relevant cluster
[409]	1243	{
[433]	1244	if( page_cxy == local_cxy ) // local cluster
	1245	{
	1246	req.type = KMEM_PAGE;
	1247	req.ptr = page_ptr;
	1248	kmem_free( &req );
	1249	}
	1250	else // remote cluster
	1251	{
	1252	rpc_pmem_release_pages_client( page_cxy , page_ptr );
	1253	}
[611]	1254
	1255	#if( DEBUG_VMM_DELETE_VSEG & 1 )
	1256	if( DEBUG_VMM_DELETE_VSEG < cycle )
	1257	printk("- release ppn %x\n", ppn );
	1258	#endif
[409]	1259	}
	1260	}
	1261	}
[1]	1262	}
[433]	1263
[611]	1264	// remove vseg from VSL and release vseg descriptor (if not MMAP)
	1265	vmm_detach_vseg_from_vsl( vmm , vseg );
	1266
	1267	#if DEBUG_VMM_DELETE_VSEG
[433]	1268	cycle = (uint32_t)hal_get_cycles();
[611]	1269	if( DEBUG_VMM_DELETE_VSEG < cycle )
[595]	1270	printk("\n[%s] thread[%x,%x] exit / process %x / vseg %s / base %x / cycle %d\n",
[611]	1271	__FUNCTION__, this->process->pid, this->trdid, pid, vseg_type_str(vseg->type), vaddr, cycle );
[433]	1272	#endif
	1273
[611]	1274	} // end vmm_delete_vseg()
[1]	1275
[611]	1276	/////////////////////////////////////////////
	1277	vseg_t * vmm_vseg_from_vaddr( vmm_t * vmm,
	1278	intptr_t vaddr )
[406]	1279	{
[408]	1280	xptr_t iter_xp;
	1281	xptr_t vseg_xp;
	1282	vseg_t * vseg;
[406]	1283
[408]	1284	// get extended pointers on VSL lock and root
	1285	xptr_t lock_xp = XPTR( local_cxy , &vmm->vsegs_lock );
	1286	xptr_t root_xp = XPTR( local_cxy , &vmm->vsegs_root );
[406]	1287
[408]	1288	// get lock protecting the VSL
[567]	1289	remote_rwlock_rd_acquire( lock_xp );
[408]	1290
	1291	// scan the list of vsegs in VSL
	1292	XLIST_FOREACH( root_xp , iter_xp )
[406]	1293	{
[408]	1294	vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist );
[433]	1295	vseg = GET_PTR( vseg_xp );
[595]	1296
[408]	1297	if( (vaddr >= vseg->min) && (vaddr < vseg->max) )
[595]	1298	{
[408]	1299	// return success
[567]	1300	remote_rwlock_rd_release( lock_xp );
[408]	1301	return vseg;
	1302	}
[406]	1303	}
	1304
[408]	1305	// return failure
[567]	1306	remote_rwlock_rd_release( lock_xp );
[408]	1307	return NULL;
[406]	1308
[595]	1309	} // end vmm_vseg_from_vaddr()
[406]	1310
[1]	1311	/////////////////////////////////////////////
	1312	error_t vmm_resize_vseg( process_t * process,
	1313	intptr_t base,
	1314	intptr_t size )
	1315	{
[406]	1316	error_t error;
	1317	vseg_t * new;
	1318	vpn_t vpn_min;
	1319	vpn_t vpn_max;
[1]	1320
	1321	// get pointer on process VMM
	1322	vmm_t * vmm = &process->vmm;
	1323
	1324	intptr_t addr_min = base;
	1325	intptr_t addr_max = base + size;
	1326
	1327	// get pointer on vseg
[595]	1328	vseg_t * vseg = vmm_vseg_from_vaddr( vmm , base );
[1]	1329
	1330	if( vseg == NULL) return EINVAL;
[21]	1331
[408]	1332	// get extended pointer on VSL lock
	1333	xptr_t lock_xp = XPTR( local_cxy , &vmm->vsegs_lock );
[21]	1334
[408]	1335	// get lock protecting VSL
[567]	1336	remote_rwlock_wr_acquire( lock_xp );
[408]	1337
[611]	1338	if( (vseg->min > addr_min) \|\| (vseg->max < addr_max) ) // not included in vseg
[1]	1339	{
[611]	1340	error = -1;
[1]	1341	}
[611]	1342	else if( (vseg->min == addr_min) && (vseg->max == addr_max) ) // vseg must be deleted
[1]	1343	{
[611]	1344	vmm_delete_vseg( process->pid , vseg->min );
[1]	1345	error = 0;
	1346	}
[611]	1347	else if( vseg->min == addr_min ) // vseg must be resized
[1]	1348	{
[406]	1349	// update vseg base address
	1350	vseg->min = addr_max;
	1351
	1352	// update vpn_base and vpn_size
	1353	vpn_min = vseg->min >> CONFIG_PPM_PAGE_SHIFT;
	1354	vpn_max = (vseg->max - 1) >> CONFIG_PPM_PAGE_SHIFT;
	1355	vseg->vpn_base = vpn_min;
	1356	vseg->vpn_size = vpn_max - vpn_min + 1;
	1357	error = 0;
[1]	1358	}
[611]	1359	else if( vseg->max == addr_max ) // vseg must be resized
[1]	1360	{
[406]	1361	// update vseg max address
	1362	vseg->max = addr_min;
	1363
	1364	// update vpn_base and vpn_size
	1365	vpn_min = vseg->min >> CONFIG_PPM_PAGE_SHIFT;
	1366	vpn_max = (vseg->max - 1) >> CONFIG_PPM_PAGE_SHIFT;
	1367	vseg->vpn_base = vpn_min;
	1368	vseg->vpn_size = vpn_max - vpn_min + 1;
	1369	error = 0;
[1]	1370	}
[611]	1371	else // vseg cut in three regions
[1]	1372	{
[406]	1373	// resize existing vseg
	1374	vseg->max = addr_min;
	1375
	1376	// update vpn_base and vpn_size
	1377	vpn_min = vseg->min >> CONFIG_PPM_PAGE_SHIFT;
	1378	vpn_max = (vseg->max - 1) >> CONFIG_PPM_PAGE_SHIFT;
	1379	vseg->vpn_base = vpn_min;
	1380	vseg->vpn_size = vpn_max - vpn_min + 1;
	1381
	1382	// create new vseg
[407]	1383	new = vmm_create_vseg( process,
	1384	vseg->type,
	1385	addr_min,
	1386	(vseg->max - addr_max),
	1387	vseg->file_offset,
	1388	vseg->file_size,
	1389	vseg->mapper_xp,
	1390	vseg->cxy );
	1391
[406]	1392	if( new == NULL ) error = EINVAL;
	1393	else error = 0;
[1]	1394	}
	1395
	1396	// release VMM lock
[567]	1397	remote_rwlock_wr_release( lock_xp );
[1]	1398
	1399	return error;
	1400
[406]	1401	} // vmm_resize_vseg()
	1402
[1]	1403	///////////////////////////////////////////
[388]	1404	error_t vmm_get_vseg( process_t * process,
[394]	1405	intptr_t vaddr,
[388]	1406	vseg_t ** found_vseg )
[1]	1407	{
[595]	1408	xptr_t vseg_xp;
	1409	vseg_t * vseg;
	1410	vmm_t * vmm;
	1411	error_t error;
[1]	1412
[440]	1413	// get pointer on local VMM
	1414	vmm = &process->vmm;
[1]	1415
[440]	1416	// try to get vseg from local VMM
[595]	1417	vseg = vmm_vseg_from_vaddr( vmm , vaddr );
[440]	1418
[388]	1419	if( vseg == NULL ) // vseg not found in local cluster => try to get it from ref
	1420	{
	1421	// get extended pointer on reference process
	1422	xptr_t ref_xp = process->ref_xp;
[1]	1423
[388]	1424	// get cluster and local pointer on reference process
	1425	cxy_t ref_cxy = GET_CXY( ref_xp );
[433]	1426	process_t * ref_ptr = GET_PTR( ref_xp );
[388]	1427
	1428	if( local_cxy == ref_cxy ) return -1; // local cluster is the reference
	1429
	1430	// get extended pointer on reference vseg
[394]	1431	rpc_vmm_get_vseg_client( ref_cxy , ref_ptr , vaddr , &vseg_xp , &error );
[388]	1432
[440]	1433	if( error ) return -1; // vseg not found => illegal user vaddr
[388]	1434
	1435	// allocate a vseg in local cluster
	1436	vseg = vseg_alloc();
	1437
[440]	1438	if( vseg == NULL ) return -1; // cannot allocate a local vseg
[388]	1439
	1440	// initialise local vseg from reference
	1441	vseg_init_from_ref( vseg , vseg_xp );
	1442
[611]	1443	// register local vseg in local VSL
	1444	vmm_attach_vseg_to_vsl( vmm , vseg );
[388]	1445	}
[595]	1446
[388]	1447	// success
	1448	*found_vseg = vseg;
[394]	1449	return 0;
[388]	1450
	1451	} // end vmm_get_vseg()
	1452
[407]	1453	//////////////////////////////////////////////////////////////////////////////////////
	1454	// This static function compute the target cluster to allocate a physical page
	1455	// for a given <vpn> in a given <vseg>, allocates the page (with an RPC if required)
	1456	// and returns an extended pointer on the allocated page descriptor.
[585]	1457	// It can be called by a thread running in any cluster.
[407]	1458	// The vseg cannot have the FILE type.
	1459	//////////////////////////////////////////////////////////////////////////////////////
	1460	static xptr_t vmm_page_allocate( vseg_t * vseg,
	1461	vpn_t vpn )
	1462	{
[433]	1463
[438]	1464	#if DEBUG_VMM_ALLOCATE_PAGE
[595]	1465	uint32_t cycle = (uint32_t)hal_get_cycles();
	1466	thread_t * this = CURRENT_THREAD;
[438]	1467	if( DEBUG_VMM_ALLOCATE_PAGE < (uint32_t)hal_get_cycles() )
[595]	1468	printk("\n[%s] thread[%x,%x] enter for vpn %x / cycle %d\n",
	1469	__FUNCTION__ , this->process->pid, this->trdid, vpn, cycle );
[433]	1470	#endif
	1471
[407]	1472	page_t * page_ptr;
	1473	cxy_t page_cxy;
	1474	kmem_req_t req;
[577]	1475	uint32_t index;
[407]	1476
[577]	1477	uint32_t type = vseg->type;
	1478	uint32_t flags = vseg->flags;
	1479	uint32_t x_size = LOCAL_CLUSTER->x_size;
	1480	uint32_t y_size = LOCAL_CLUSTER->y_size;
[407]	1481
[567]	1482	// check vseg type
	1483	assert( ( type != VSEG_TYPE_FILE ) , "illegal vseg type\n" );
[407]	1484
	1485	if( flags & VSEG_DISTRIB ) // distributed => cxy depends on vpn LSB
	1486	{
[577]	1487	index = vpn & ((x_size * y_size) - 1);
	1488	page_cxy = HAL_CXY_FROM_XY( (index / y_size) , (index % y_size) );
[561]	1489
[577]	1490	// If the cluster selected from VPN's LSBs is empty, we select one randomly
	1491	if ( cluster_is_active( page_cxy ) == false )
	1492	{
	1493	page_cxy = cluster_random_select();
[561]	1494	}
[407]	1495	}
	1496	else // other cases => cxy specified in vseg
	1497	{
[561]	1498	page_cxy = vseg->cxy;
[407]	1499	}
	1500
	1501	// allocate a physical page from target cluster
	1502	if( page_cxy == local_cxy ) // target cluster is the local cluster
	1503	{
	1504	req.type = KMEM_PAGE;
	1505	req.size = 0;
	1506	req.flags = AF_NONE;
	1507	page_ptr = (page_t *)kmem_alloc( &req );
	1508	}
	1509	else // target cluster is not the local cluster
	1510	{
	1511	rpc_pmem_get_pages_client( page_cxy , 0 , &page_ptr );
	1512	}
	1513
[438]	1514	#if DEBUG_VMM_ALLOCATE_PAGE
[595]	1515	cycle = (uint32_t)hal_get_cycles();
[438]	1516	if( DEBUG_VMM_ALLOCATE_PAGE < (uint32_t)hal_get_cycles() )
[595]	1517	printk("\n[%s] thread[%x,%x] exit for vpn %x / ppn %x / cycle %d\n",
	1518	__FUNCTION__ , this->process->pid, this->trdid, vpn,
	1519	ppm_page2ppn( XPTR( page_cxy , page_ptr ) , cycle );
[433]	1520	#endif
	1521
[407]	1522	if( page_ptr == NULL ) return XPTR_NULL;
	1523	else return XPTR( page_cxy , page_ptr );
	1524
	1525	} // end vmm_page_allocate()
	1526
[313]	1527	////////////////////////////////////////
	1528	error_t vmm_get_one_ppn( vseg_t * vseg,
	1529	vpn_t vpn,
	1530	ppn_t * ppn )
	1531	{
	1532	error_t error;
[407]	1533	xptr_t page_xp; // extended pointer on physical page descriptor
[606]	1534	uint32_t page_id; // missing page index in vseg mapper
[406]	1535	uint32_t type; // vseg type;
[313]	1536
[406]	1537	type = vseg->type;
[606]	1538	page_id = vpn - vseg->vpn_base;
[313]	1539
[438]	1540	#if DEBUG_VMM_GET_ONE_PPN
[595]	1541	uint32_t cycle = (uint32_t)hal_get_cycles();
	1542	thread_t * this = CURRENT_THREAD;
	1543	if( DEBUG_VMM_GET_ONE_PPN < cycle )
[606]	1544	printk("\n[%s] thread[%x,%x] enter for vpn %x / type %s / page_id %d / cycle %d\n",
	1545	__FUNCTION__, this->process->pid, this->trdid, vpn, vseg_type_str(type), page_id, cycle );
[433]	1546	#endif
[313]	1547
[406]	1548	// FILE type : get the physical page from the file mapper
[313]	1549	if( type == VSEG_TYPE_FILE )
	1550	{
[406]	1551	// get extended pointer on mapper
[407]	1552	xptr_t mapper_xp = vseg->mapper_xp;
[313]	1553
[567]	1554	assert( (mapper_xp != XPTR_NULL),
	1555	"mapper not defined for a FILE vseg\n" );
[406]	1556
[606]	1557	// get extended pointer on page descriptor
	1558	page_xp = mapper_remote_get_page( mapper_xp , page_id );
[406]	1559
[606]	1560	if ( page_xp == XPTR_NULL ) return EINVAL;
[313]	1561	}
	1562
[406]	1563	// Other types : allocate a physical page from target cluster,
[407]	1564	// as defined by vseg type and vpn value
[313]	1565	else
	1566	{
[433]	1567	// allocate one physical page
[407]	1568	page_xp = vmm_page_allocate( vseg , vpn );
[406]	1569
[407]	1570	if( page_xp == XPTR_NULL ) return ENOMEM;
[313]	1571
[406]	1572	// initialise missing page from .elf file mapper for DATA and CODE types
[440]	1573	// the vseg->mapper_xp field is an extended pointer on the .elf file mapper
[313]	1574	if( (type == VSEG_TYPE_CODE) \|\| (type == VSEG_TYPE_DATA) )
	1575	{
[406]	1576	// get extended pointer on mapper
	1577	xptr_t mapper_xp = vseg->mapper_xp;
[313]	1578
[567]	1579	assert( (mapper_xp != XPTR_NULL),
	1580	"mapper not defined for a CODE or DATA vseg\n" );
[406]	1581
	1582	// compute missing page offset in vseg
[606]	1583	uint32_t offset = page_id << CONFIG_PPM_PAGE_SHIFT;
[406]	1584
[313]	1585	// compute missing page offset in .elf file
[406]	1586	uint32_t elf_offset = vseg->file_offset + offset;
[313]	1587
[438]	1588	#if (DEBUG_VMM_GET_ONE_PPN & 0x1)
[469]	1589	if( DEBUG_VMM_GET_ONE_PPN < (uint32_t)hal_get_cycles() )
[595]	1590	printk("\n[%s] thread[%x,%x] for vpn = %x / elf_offset = %x\n",
	1591	__FUNCTION__, this->process->pid, this->trdid, vpn, elf_offset );
[433]	1592	#endif
[406]	1593	// compute extended pointer on page base
[407]	1594	xptr_t base_xp = ppm_page2base( page_xp );
[313]	1595
[406]	1596	// file_size (in .elf mapper) can be smaller than vseg_size (BSS)
	1597	uint32_t file_size = vseg->file_size;
	1598
	1599	if( file_size < offset ) // missing page fully in BSS
[313]	1600	{
[406]	1601
[438]	1602	#if (DEBUG_VMM_GET_ONE_PPN & 0x1)
[469]	1603	if( DEBUG_VMM_GET_ONE_PPN < (uint32_t)hal_get_cycles() )
[595]	1604	printk("\n[%s] thread[%x,%x] for vpn %x / fully in BSS\n",
	1605	__FUNCTION__, this->process->pid, this->trdid, vpn );
[433]	1606	#endif
[407]	1607	if( GET_CXY( page_xp ) == local_cxy )
[313]	1608	{
[315]	1609	memset( GET_PTR( base_xp ) , 0 , CONFIG_PPM_PAGE_SIZE );
[313]	1610	}
	1611	else
	1612	{
[315]	1613	hal_remote_memset( base_xp , 0 , CONFIG_PPM_PAGE_SIZE );
[313]	1614	}
	1615	}
[406]	1616	else if( file_size >= (offset + CONFIG_PPM_PAGE_SIZE) ) // fully in mapper
[315]	1617	{
[406]	1618
[438]	1619	#if (DEBUG_VMM_GET_ONE_PPN & 0x1)
[469]	1620	if( DEBUG_VMM_GET_ONE_PPN < (uint32_t)hal_get_cycles() )
[595]	1621	printk("\n[%s] thread[%x,%x] for vpn %x / fully in mapper\n",
	1622	__FUNCTION__, this->process->pid, this->trdid, vpn );
[433]	1623	#endif
[606]	1624	error = mapper_move_kernel( mapper_xp,
	1625	true, // to_buffer
	1626	elf_offset,
	1627	base_xp,
	1628	CONFIG_PPM_PAGE_SIZE );
[313]	1629	if( error ) return EINVAL;
	1630	}
[406]	1631	else // both in mapper and in BSS :
	1632	// - (file_size - offset) bytes from mapper
	1633	// - (page_size + offset - file_size) bytes from BSS
[313]	1634	{
[406]	1635
[438]	1636	#if (DEBUG_VMM_GET_ONE_PPN & 0x1)
[469]	1637	if( DEBUG_VMM_GET_ONE_PPN < (uint32_t)hal_get_cycles() )
[610]	1638	printk("\n[%s] thread[%x,%x] for vpn %x / both mapper & BSS\n"
[433]	1639	" %d bytes from mapper / %d bytes from BSS\n",
[595]	1640	__FUNCTION__, this->process->pid, this->trdid, vpn,
[407]	1641	file_size - offset , offset + CONFIG_PPM_PAGE_SIZE - file_size );
[433]	1642	#endif
[313]	1643	// initialize mapper part
[606]	1644	error = mapper_move_kernel( mapper_xp,
	1645	true, // to buffer
	1646	elf_offset,
	1647	base_xp,
	1648	file_size - offset );
[313]	1649	if( error ) return EINVAL;
	1650
	1651	// initialize BSS part
[407]	1652	if( GET_CXY( page_xp ) == local_cxy )
[313]	1653	{
[406]	1654	memset( GET_PTR( base_xp ) + file_size - offset , 0 ,
	1655	offset + CONFIG_PPM_PAGE_SIZE - file_size );
[313]	1656	}
	1657	else
	1658	{
[406]	1659	hal_remote_memset( base_xp + file_size - offset , 0 ,
	1660	offset + CONFIG_PPM_PAGE_SIZE - file_size );
[313]	1661	}
	1662	}
	1663	} // end initialisation for CODE or DATA types
	1664	}
	1665
	1666	// return ppn
[407]	1667	*ppn = ppm_page2ppn( page_xp );
[406]	1668
[438]	1669	#if DEBUG_VMM_GET_ONE_PPN
[595]	1670	cycle = (uint32_t)hal_get_cycles();
	1671	if( DEBUG_VMM_GET_ONE_PPN < cycle )
	1672	printk("\n[%s] thread[%x,%x] exit for vpn %x / ppn %x / cycle\n",
	1673	__FUNCTION__ , this->process->pid, this->trdid , vpn , *ppn, cycle );
[433]	1674	#endif
[406]	1675
[313]	1676	return 0;
	1677
	1678	} // end vmm_get_one_ppn()
	1679
[585]	1680	///////////////////////////////////////////////////
	1681	error_t vmm_handle_page_fault( process_t * process,
	1682	vpn_t vpn )
[1]	1683	{
[585]	1684	vseg_t * vseg; // vseg containing vpn
	1685	uint32_t new_attr; // new PTE_ATTR value
	1686	ppn_t new_ppn; // new PTE_PPN value
	1687	uint32_t ref_attr; // PTE_ATTR value in reference GPT
	1688	ppn_t ref_ppn; // PTE_PPN value in reference GPT
	1689	cxy_t ref_cxy; // reference cluster for missing vpn
	1690	process_t * ref_ptr; // reference process for missing vpn
	1691	xptr_t local_gpt_xp; // extended pointer on local GPT
	1692	xptr_t local_lock_xp; // extended pointer on local GPT lock
	1693	xptr_t ref_gpt_xp; // extended pointer on reference GPT
	1694	xptr_t ref_lock_xp; // extended pointer on reference GPT lock
	1695	error_t error; // value returned by called functions
[1]	1696
[585]	1697	// get local vseg (access to reference VSL can be required)
	1698	error = vmm_get_vseg( process,
	1699	(intptr_t)vpn<<CONFIG_PPM_PAGE_SHIFT,
	1700	&vseg );
	1701	if( error )
	1702	{
[595]	1703	printk("\n[ERROR] in %s : vpn %x in process %x not in a registered vseg\n",
[585]	1704	__FUNCTION__ , vpn , process->pid );
	1705
	1706	return EXCP_USER_ERROR;
	1707	}
	1708
	1709	#if DEBUG_VMM_HANDLE_PAGE_FAULT
	1710	uint32_t cycle = (uint32_t)hal_get_cycles();
[567]	1711	thread_t * this = CURRENT_THREAD;
[585]	1712	if( DEBUG_VMM_HANDLE_PAGE_FAULT < cycle )
[595]	1713	printk("\n[%s] threadr[%x,%x] enter for vpn %x / %s / cycle %d\n",
[585]	1714	__FUNCTION__, this->process->pid, this->trdid, vpn, vseg_type_str(vseg->type), cycle );
[433]	1715	#endif
[406]	1716
[585]	1717	//////////////// private vseg => access only the local GPT
	1718	if( (vseg->type == VSEG_TYPE_STACK) \|\| (vseg->type == VSEG_TYPE_CODE) )
[438]	1719	{
[585]	1720	// build extended pointer on local GPT and local GPT lock
	1721	local_gpt_xp = XPTR( local_cxy , &process->vmm.gpt );
	1722	local_lock_xp = XPTR( local_cxy , &process->vmm.gpt_lock );
[407]	1723
[585]	1724	// take local GPT lock in write mode
	1725	remote_rwlock_wr_acquire( local_lock_xp );
[407]	1726
[585]	1727	// check VPN still unmapped in local GPT
[595]	1728
[585]	1729	// do nothing if VPN has been mapped by a a concurrent page_fault
	1730	hal_gpt_get_pte( local_gpt_xp,
	1731	vpn,
	1732	&new_attr,
	1733	&new_ppn );
[407]	1734
[585]	1735	if( (new_attr & GPT_MAPPED) == 0 ) // VPN still unmapped
	1736	{
	1737	// allocate and initialise a physical page depending on the vseg type
	1738	error = vmm_get_one_ppn( vseg , vpn , &new_ppn );
[407]	1739
[585]	1740	if( error )
[408]	1741	{
	1742	printk("\n[ERROR] in %s : no memory / process = %x / vpn = %x\n",
	1743	__FUNCTION__ , process->pid , vpn );
[1]	1744
[585]	1745	// release local GPT lock in write mode
	1746	remote_rwlock_wr_release( local_lock_xp );
[406]	1747
[585]	1748	return EXCP_KERNEL_PANIC;
[407]	1749	}
	1750
[408]	1751	// define new_attr from vseg flags
[407]	1752	new_attr = GPT_MAPPED \| GPT_SMALL;
	1753	if( vseg->flags & VSEG_USER ) new_attr \|= GPT_USER;
	1754	if( vseg->flags & VSEG_WRITE ) new_attr \|= GPT_WRITABLE;
	1755	if( vseg->flags & VSEG_EXEC ) new_attr \|= GPT_EXECUTABLE;
	1756	if( vseg->flags & VSEG_CACHE ) new_attr \|= GPT_CACHABLE;
	1757
[585]	1758	// set PTE (PPN & attribute) to local GPT
	1759	error = hal_gpt_set_pte( local_gpt_xp,
[408]	1760	vpn,
	1761	new_attr,
	1762	new_ppn );
[585]	1763	if ( error )
[407]	1764	{
[585]	1765	printk("\n[ERROR] in %s : cannot update local GPT / process %x / vpn = %x\n",
[407]	1766	__FUNCTION__ , process->pid , vpn );
[585]	1767
	1768	// release local GPT lock in write mode
	1769	remote_rwlock_wr_release( local_lock_xp );
	1770
	1771	return EXCP_KERNEL_PANIC;
[407]	1772	}
	1773	}
[585]	1774
	1775	// release local GPT lock in write mode
	1776	remote_rwlock_wr_release( local_lock_xp );
	1777
	1778	#if DEBUG_VMM_HANDLE_PAGE_FAULT
	1779	cycle = (uint32_t)hal_get_cycles();
	1780	if( DEBUG_VMM_HANDLE_PAGE_FAULT < cycle )
[595]	1781	printk("\n[%s] private page fault handled / vpn %x / ppn %x / attr %x / cycle %d\n",
[585]	1782	__FUNCTION__, vpn, new_ppn, new_attr, cycle );
	1783	#endif
	1784	return EXCP_NON_FATAL;
	1785
	1786	} // end local GPT access
	1787
	1788	//////////// public vseg => access reference GPT
	1789	else
	1790	{
	1791	// get reference process cluster and local pointer
	1792	ref_cxy = GET_CXY( process->ref_xp );
	1793	ref_ptr = GET_PTR( process->ref_xp );
	1794
	1795	// build extended pointer on reference GPT and reference GPT lock
	1796	ref_gpt_xp = XPTR( ref_cxy , &ref_ptr->vmm.gpt );
	1797	ref_lock_xp = XPTR( ref_cxy , &ref_ptr->vmm.gpt_lock );
	1798
	1799	// build extended pointer on local GPT and local GPT lock
	1800	local_gpt_xp = XPTR( local_cxy , &process->vmm.gpt );
	1801	local_lock_xp = XPTR( local_cxy , &process->vmm.gpt_lock );
	1802
	1803	// take reference GPT lock in read mode
	1804	remote_rwlock_rd_acquire( ref_lock_xp );
	1805
	1806	// get directly PPN & attributes from reference GPT
	1807	// this can avoids a costly RPC for a false page fault
	1808	hal_gpt_get_pte( ref_gpt_xp,
	1809	vpn,
	1810	&ref_attr,
	1811	&ref_ppn );
	1812
	1813	// release reference GPT lock in read mode
	1814	remote_rwlock_rd_release( ref_lock_xp );
	1815
	1816	if( ref_attr & GPT_MAPPED ) // false page fault => update local GPT
[1]	1817	{
[585]	1818	// take local GPT lock in write mode
	1819	remote_rwlock_wr_acquire( local_lock_xp );
	1820
	1821	// check VPN still unmapped in local GPT
	1822	hal_gpt_get_pte( local_gpt_xp,
	1823	vpn,
	1824	&new_attr,
	1825	&new_ppn );
[1]	1826
[585]	1827	if( (new_attr & GPT_MAPPED) == 0 ) // VPN still unmapped
	1828	{
	1829	// update local GPT from reference GPT
	1830	error = hal_gpt_set_pte( local_gpt_xp,
	1831	vpn,
	1832	ref_attr,
	1833	ref_ppn );
	1834	if( error )
	1835	{
[595]	1836	printk("\n[ERROR] in %s : cannot update local GPT / process %x / vpn %x\n",
[585]	1837	__FUNCTION__ , process->pid , vpn );
	1838
	1839	// release local GPT lock in write mode
	1840	remote_rwlock_wr_release( local_lock_xp );
	1841
	1842	return EXCP_KERNEL_PANIC;
	1843	}
	1844	}
	1845	else // VPN has been mapped by a a concurrent page_fault
	1846	{
	1847	// keep PTE from local GPT
	1848	ref_attr = new_attr;
	1849	ref_ppn = new_ppn;
	1850	}
	1851
	1852	// release local GPT lock in write mode
	1853	remote_rwlock_wr_release( local_lock_xp );
	1854
	1855	#if DEBUG_VMM_HANDLE_PAGE_FAULT
[433]	1856	cycle = (uint32_t)hal_get_cycles();
[585]	1857	if( DEBUG_VMM_HANDLE_PAGE_FAULT < cycle )
[595]	1858	printk("\n[%s] false page fault handled / vpn %x / ppn %x / attr %x / cycle %d\n",
[585]	1859	__FUNCTION__, vpn, ref_ppn, ref_attr, cycle );
[433]	1860	#endif
[585]	1861	return EXCP_NON_FATAL;
	1862	}
	1863	else // true page fault => update reference GPT
	1864	{
	1865	// take reference GPT lock in write mode
	1866	remote_rwlock_wr_acquire( ref_lock_xp );
	1867
	1868	// check VPN still unmapped in reference GPT
	1869	// do nothing if VPN has been mapped by a a concurrent page_fault
	1870	hal_gpt_get_pte( ref_gpt_xp,
	1871	vpn,
	1872	&ref_attr,
	1873	&ref_ppn );
[406]	1874
[585]	1875	if( (ref_attr & GPT_MAPPED) == 0 ) // VPN actually unmapped
	1876	{
	1877	// allocate and initialise a physical page depending on the vseg type
	1878	error = vmm_get_one_ppn( vseg , vpn , &new_ppn );
[1]	1879
[585]	1880	if( error )
	1881	{
	1882	printk("\n[ERROR] in %s : no memory / process = %x / vpn = %x\n",
	1883	__FUNCTION__ , process->pid , vpn );
[313]	1884
[585]	1885	// release reference GPT lock in write mode
	1886	remote_rwlock_wr_release( ref_lock_xp );
	1887
	1888	return EXCP_KERNEL_PANIC;
	1889	}
[1]	1890
[585]	1891	// define new_attr from vseg flags
	1892	new_attr = GPT_MAPPED \| GPT_SMALL;
	1893	if( vseg->flags & VSEG_USER ) new_attr \|= GPT_USER;
	1894	if( vseg->flags & VSEG_WRITE ) new_attr \|= GPT_WRITABLE;
	1895	if( vseg->flags & VSEG_EXEC ) new_attr \|= GPT_EXECUTABLE;
	1896	if( vseg->flags & VSEG_CACHE ) new_attr \|= GPT_CACHABLE;
[440]	1897
[585]	1898	// update reference GPT
	1899	error = hal_gpt_set_pte( ref_gpt_xp,
	1900	vpn,
	1901	new_attr,
	1902	new_ppn );
	1903
	1904	// update local GPT (protected by reference GPT lock)
	1905	error \|= hal_gpt_set_pte( local_gpt_xp,
	1906	vpn,
	1907	new_attr,
	1908	new_ppn );
	1909
	1910	if( error )
	1911	{
	1912	printk("\n[ERROR] in %s : cannot update GPT / process %x / vpn = %x\n",
	1913	__FUNCTION__ , process->pid , vpn );
	1914
	1915	// release reference GPT lock in write mode
	1916	remote_rwlock_wr_release( ref_lock_xp );
	1917
	1918	return EXCP_KERNEL_PANIC;
	1919	}
	1920	}
	1921
	1922	// release reference GPT lock in write mode
	1923	remote_rwlock_wr_release( ref_lock_xp );
	1924
[440]	1925	#if DEBUG_VMM_HANDLE_PAGE_FAULT
[585]	1926	cycle = (uint32_t)hal_get_cycles();
[469]	1927	if( DEBUG_VMM_HANDLE_PAGE_FAULT < cycle )
[595]	1928	printk("\n[%s] true page fault handled / vpn %x / ppn %x / attr %x / cycle %d\n",
[585]	1929	__FUNCTION__, vpn, new_ppn, new_attr, cycle );
[435]	1930	#endif
[585]	1931	return EXCP_NON_FATAL;
	1932	}
	1933	}
	1934	} // end vmm_handle_page_fault()
[435]	1935
[585]	1936	////////////////////////////////////////////
	1937	error_t vmm_handle_cow( process_t * process,
	1938	vpn_t vpn )
	1939	{
	1940	vseg_t * vseg; // vseg containing vpn
	1941	cxy_t ref_cxy; // reference cluster for missing vpn
	1942	process_t * ref_ptr; // reference process for missing vpn
	1943	xptr_t gpt_xp; // extended pointer on GPT
	1944	xptr_t gpt_lock_xp; // extended pointer on GPT lock
	1945	uint32_t old_attr; // current PTE_ATTR value
	1946	ppn_t old_ppn; // current PTE_PPN value
	1947	uint32_t new_attr; // new PTE_ATTR value
	1948	ppn_t new_ppn; // new PTE_PPN value
	1949	error_t error;
[1]	1950
[585]	1951	#if DEBUG_VMM_HANDLE_COW
	1952	uint32_t cycle = (uint32_t)hal_get_cycles();
	1953	thread_t * this = CURRENT_THREAD;
	1954	if( DEBUG_VMM_HANDLE_COW < cycle )
[595]	1955	printk("\n[%s] thread[%x,%x] enter for vpn %x / core[%x,%d] / cycle %d\n",
[585]	1956	__FUNCTION__, process->pid, this->trdid, vpn, local_cxy, this->core->lid, cycle );
	1957	#endif
	1958
[610]	1959	// access local GPT to get GPT_COW flag
	1960	bool_t cow = hal_gpt_pte_is_cow( &(process->vmm.gpt), vpn );
	1961
	1962	if( cow == false ) return EXCP_USER_ERROR;
	1963
[585]	1964	// get local vseg
	1965	error = vmm_get_vseg( process,
	1966	(intptr_t)vpn<<CONFIG_PPM_PAGE_SHIFT,
	1967	&vseg );
[440]	1968	if( error )
[1]	1969	{
[595]	1970	printk("\n[PANIC] in %s : vpn %x in process %x not in a registered vseg\n",
[585]	1971	__FUNCTION__, vpn, process->pid );
	1972
	1973	return EXCP_KERNEL_PANIC;
[440]	1974	}
[407]	1975
[585]	1976	// get reference GPT cluster and local pointer
	1977	ref_cxy = GET_CXY( process->ref_xp );
	1978	ref_ptr = GET_PTR( process->ref_xp );
[407]	1979
[610]	1980	// build relevant extended pointers on relevant GPT and GPT lock
[585]	1981	// - access local GPT for a private vseg
	1982	// - access reference GPT for a public vseg
	1983	if( (vseg->type == VSEG_TYPE_STACK) \|\| (vseg->type == VSEG_TYPE_CODE) )
[440]	1984	{
[585]	1985	gpt_xp = XPTR( local_cxy , &process->vmm.gpt );
	1986	gpt_lock_xp = XPTR( local_cxy , &process->vmm.gpt_lock );
[1]	1987	}
[440]	1988	else
[1]	1989	{
[585]	1990	gpt_xp = XPTR( ref_cxy , &ref_ptr->vmm.gpt );
	1991	gpt_lock_xp = XPTR( ref_cxy , &ref_ptr->vmm.gpt_lock );
[1]	1992	}
	1993
[585]	1994	// take GPT lock in write mode
	1995	remote_rwlock_wr_acquire( gpt_lock_xp );
[441]	1996
[585]	1997	// get current PTE from reference GPT
	1998	hal_gpt_get_pte( gpt_xp,
	1999	vpn,
	2000	&old_attr,
	2001	&old_ppn );
[441]	2002
[585]	2003	// the PTE must be mapped for a COW
	2004	if( (old_attr & GPT_MAPPED) == 0 )
	2005	{
	2006	printk("\n[PANIC] in %s : VPN %x in process %x unmapped\n",
	2007	__FUNCTION__, vpn, process->pid );
[407]	2008
[585]	2009	// release GPT lock in write mode
	2010	remote_rwlock_wr_acquire( gpt_lock_xp );
[407]	2011
[585]	2012	return EXCP_KERNEL_PANIC;
[407]	2013	}
	2014
[585]	2015	// get extended pointer, cluster and local pointer on physical page descriptor
	2016	xptr_t page_xp = ppm_ppn2page( old_ppn );
	2017	cxy_t page_cxy = GET_CXY( page_xp );
	2018	page_t * page_ptr = GET_PTR( page_xp );
[435]	2019
[585]	2020	// get extended pointers on forks and lock field in page descriptor
	2021	xptr_t forks_xp = XPTR( page_cxy , &page_ptr->forks );
	2022	xptr_t forks_lock_xp = XPTR( page_cxy , &page_ptr->lock );
[407]	2023
[585]	2024	// take lock protecting "forks" counter
	2025	remote_busylock_acquire( forks_lock_xp );
[407]	2026
[585]	2027	// get number of pending forks from page descriptor
	2028	uint32_t forks = hal_remote_l32( forks_xp );
[441]	2029
[585]	2030	if( forks ) // pending fork => allocate a new page, and copy old to new
	2031	{
	2032	// allocate a new physical page
	2033	page_xp = vmm_page_allocate( vseg , vpn );
	2034	if( page_xp == XPTR_NULL )
	2035	{
	2036	printk("\n[PANIC] in %s : no memory for vpn %x in process %x\n",
	2037	__FUNCTION__ , vpn, process->pid );
[441]	2038
[585]	2039	// release GPT lock in write mode
	2040	remote_rwlock_wr_acquire( gpt_lock_xp );
[441]	2041
[585]	2042	// release lock protecting "forks" counter
	2043	remote_busylock_release( forks_lock_xp );
[441]	2044
[585]	2045	return EXCP_KERNEL_PANIC;
	2046	}
[441]	2047
[585]	2048	// compute allocated page PPN
	2049	new_ppn = ppm_page2ppn( page_xp );
[441]	2050
[585]	2051	// copy old page content to new page
	2052	xptr_t old_base_xp = ppm_ppn2base( old_ppn );
	2053	xptr_t new_base_xp = ppm_ppn2base( new_ppn );
	2054	memcpy( GET_PTR( new_base_xp ),
	2055	GET_PTR( old_base_xp ),
	2056	CONFIG_PPM_PAGE_SIZE );
[441]	2057
[585]	2058	// decrement pending forks counter in page descriptor
	2059	hal_remote_atomic_add( forks_xp , -1 );
[441]	2060
[585]	2061	#if(DEBUG_VMM_HANDLE_COW & 1)
	2062	if( DEBUG_VMM_HANDLE_COW < cycle )
[595]	2063	printk("\n[%s] thread[%x,%x] : pending forks => allocate a new PPN %x\n",
[585]	2064	__FUNCTION__, process->pid, this->trdid, new_ppn );
	2065	#endif
[440]	2066
[585]	2067	}
	2068	else // no pending fork => keep the existing page
	2069	{
[1]	2070
[585]	2071	#if(DEBUG_VMM_HANDLE_COW & 1)
	2072	if( DEBUG_VMM_HANDLE_COW < cycle )
[595]	2073	printk("\n[%s] thread[%x,%x] no pending forks => keep existing PPN %x\n",
[585]	2074	__FUNCTION__, process->pid, this->trdid, new_ppn );
	2075	#endif
	2076	new_ppn = old_ppn;
	2077	}
[1]	2078
[585]	2079	// release lock protecting "forks" counter
	2080	remote_busylock_release( forks_lock_xp );
	2081
	2082	// build new_attr : reset COW and set WRITABLE,
	2083	new_attr = (old_attr \| GPT_WRITABLE) & (~GPT_COW);
	2084
	2085	// update the relevan GPT
	2086	// - private vseg => update local GPT
	2087	// - public vseg => update all GPT copies
	2088	if( (vseg->type == VSEG_TYPE_STACK) \|\| (vseg->type == VSEG_TYPE_CODE) )
[1]	2089	{
[585]	2090	hal_gpt_set_pte( gpt_xp,
	2091	vpn,
	2092	new_attr,
	2093	new_ppn );
[1]	2094	}
[585]	2095	else
[1]	2096	{
[585]	2097	if( ref_cxy == local_cxy ) // reference cluster is local
	2098	{
	2099	vmm_global_update_pte( process,
	2100	vpn,
	2101	new_attr,
	2102	new_ppn );
	2103	}
	2104	else // reference cluster is remote
	2105	{
	2106	rpc_vmm_global_update_pte_client( ref_cxy,
	2107	ref_ptr,
	2108	vpn,
	2109	new_attr,
	2110	new_ppn );
	2111	}
[1]	2112	}
	2113
[585]	2114	// release GPT lock in write mode
	2115	remote_rwlock_wr_release( gpt_lock_xp );
[21]	2116
[585]	2117	#if DEBUG_VMM_HANDLE_COW
	2118	cycle = (uint32_t)hal_get_cycles();
	2119	if( DEBUG_VMM_HANDLE_COW < cycle )
[595]	2120	printk("\n[%s] thread[%x,%x] exit for vpn %x / core[%x,%d] / cycle %d\n",
[585]	2121	__FUNCTION__, process->pid, this->trdid, vpn, local_cxy, this->core->lid, cycle );
	2122	#endif
[313]	2123
[585]	2124	return EXCP_NON_FATAL;
[1]	2125
[585]	2126	} // end vmm_handle_cow()
	2127

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