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source: trunk/kernel/mm/vmm.c @ 416

Last change on this file since 416 was 416, checked in by alain, 6 years ago
Improve sys_exec.
File size: 59.2 KB

Rev	Line
[1]	1	/*
	2	* vmm.c - virtual memory manager related operations interface.
	3	*
	4	* Authors Ghassan Almaless (2008,2009,2010,2011, 2012)
	5	* Mohamed Lamine Karaoui (2015)
	6	* Alain Greiner (2016)
[21]	7	*
[1]	8	* Copyright (c) UPMC Sorbonne Universites
	9	*
	10	* This file is part of ALMOS-MKH.
	11	*
	12	* ALMOS-MKH is free software; you can redistribute it and/or modify it
	13	* under the terms of the GNU General Public License as published by
	14	* the Free Software Foundation; version 2.0 of the License.
	15	*
	16	* ALMOS-MKH is distributed in the hope that it will be useful, but
	17	* WITHOUT ANY WARRANTY; without even the implied warranty of
	18	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	19	* General Public License for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License
	22	* along with ALMOS-MKH; if not, write to the Free Software Foundation,
	23	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	24	*/
	25
[14]	26	#include <kernel_config.h>
[1]	27	#include <hal_types.h>
	28	#include <hal_special.h>
	29	#include <hal_gpt.h>
[409]	30	#include <hal_vmm.h>
[1]	31	#include <printk.h>
[23]	32	#include <memcpy.h>
[1]	33	#include <rwlock.h>
	34	#include <list.h>
[408]	35	#include <xlist.h>
[1]	36	#include <bits.h>
	37	#include <process.h>
	38	#include <thread.h>
	39	#include <vseg.h>
	40	#include <cluster.h>
	41	#include <scheduler.h>
	42	#include <vfs.h>
	43	#include <mapper.h>
	44	#include <page.h>
	45	#include <kmem.h>
	46	#include <vmm.h>
	47
	48	//////////////////////////////////////////////////////////////////////////////////
	49	// Extern global variables
	50	//////////////////////////////////////////////////////////////////////////////////
	51
	52	extern process_t process_zero; // defined in cluster.c file
	53
	54
[415]	55	///////////////////////////////////////
	56	error_t vmm_init( process_t * process )
[21]	57	{
[1]	58	error_t error;
	59	vseg_t * vseg_kentry;
	60	vseg_t * vseg_args;
	61	vseg_t * vseg_envs;
	62	intptr_t base;
	63	intptr_t size;
	64
[407]	65	vmm_dmsg("\n[DBG] %s : core[%x,%d] enters for process %x\n",
	66	__FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , process->pid );
[204]	67
[1]	68	// get pointer on VMM
	69	vmm_t * vmm = &process->vmm;
	70
[407]	71	// initialize local list of vsegs
	72	vmm->vsegs_nr = 0;
[408]	73	xlist_root_init( XPTR( local_cxy , &vmm->vsegs_root ) );
	74	remote_rwlock_init( XPTR( local_cxy , &vmm->vsegs_lock ) );
[407]	75
[204]	76	assert( ((CONFIG_VMM_KENTRY_SIZE + CONFIG_VMM_ARGS_SIZE + CONFIG_VMM_ENVS_SIZE)
	77	<= CONFIG_VMM_ELF_BASE) , __FUNCTION__ , "UTILS zone too small\n" );
[21]	78
[204]	79	assert( (CONFIG_THREAD_MAX_PER_CLUSTER <= 32) , __FUNCTION__ ,
	80	"no more than 32 threads per cluster for a single process\n");
[1]	81
[204]	82	assert( ((CONFIG_VMM_STACK_SIZE * CONFIG_THREAD_MAX_PER_CLUSTER) <=
	83	(CONFIG_VMM_VSPACE_SIZE - CONFIG_VMM_STACK_BASE)) , __FUNCTION__ ,
	84	"STACK zone too small\n");
[1]	85
[409]	86	// register kentry vseg in VSL
[406]	87	base = CONFIG_VMM_KENTRY_BASE << CONFIG_PPM_PAGE_SHIFT;
[1]	88	size = CONFIG_VMM_KENTRY_SIZE << CONFIG_PPM_PAGE_SHIFT;
[406]	89
[407]	90	vseg_kentry = vmm_create_vseg( process,
	91	VSEG_TYPE_CODE,
	92	base,
	93	size,
	94	0, // file_offset unused
	95	0, // file_size unused
	96	XPTR_NULL, // mapper_xp unused
	97	local_cxy );
[204]	98
[415]	99	if( vseg_kentry == NULL )
	100	{
	101	printk("\n[ERROR] in %s : cannot register kentry vseg\n", __FUNCTION__ );
	102	return -1;
	103	}
[204]	104
[406]	105	vmm->kent_vpn_base = base;
[1]	106
[409]	107	// register args vseg in VSL
[406]	108	base = (CONFIG_VMM_KENTRY_BASE +
	109	CONFIG_VMM_KENTRY_SIZE ) << CONFIG_PPM_PAGE_SHIFT;
[1]	110	size = CONFIG_VMM_ARGS_SIZE << CONFIG_PPM_PAGE_SHIFT;
[406]	111
[407]	112	vseg_args = vmm_create_vseg( process,
	113	VSEG_TYPE_DATA,
	114	base,
	115	size,
	116	0, // file_offset unused
	117	0, // file_size unused
	118	XPTR_NULL, // mapper_xp unused
	119	local_cxy );
[204]	120
[415]	121	if( vseg_args == NULL )
	122	{
	123	printk("\n[ERROR] in %s : cannot register args vseg\n", __FUNCTION__ );
	124	return -1;
	125	}
[204]	126
[406]	127	vmm->args_vpn_base = base;
[1]	128
[409]	129	// register the envs vseg in VSL
[406]	130	base = (CONFIG_VMM_KENTRY_BASE +
	131	CONFIG_VMM_KENTRY_SIZE +
	132	CONFIG_VMM_ARGS_SIZE ) << CONFIG_PPM_PAGE_SHIFT;
[1]	133	size = CONFIG_VMM_ENVS_SIZE << CONFIG_PPM_PAGE_SHIFT;
[406]	134
[407]	135	vseg_envs = vmm_create_vseg( process,
	136	VSEG_TYPE_DATA,
	137	base,
	138	size,
	139	0, // file_offset unused
	140	0, // file_size unused
	141	XPTR_NULL, // mapper_xp unused
	142	local_cxy );
[204]	143
[415]	144	if( vseg_envs == NULL )
	145	{
	146	printk("\n[ERROR] in %s : cannot register envs vseg\n", __FUNCTION__ );
	147	return -1;
	148	}
[204]	149
[406]	150	vmm->envs_vpn_base = base;
[1]	151
[409]	152	// create GPT (empty)
[1]	153	error = hal_gpt_create( &vmm->gpt );
	154
[415]	155	if( error )
	156	printk("\n[ERROR] in %s : cannot create GPT\n", __FUNCTION__ );
[204]	157
[415]	158	// initialize GPT (architecture specic)
[409]	159	// (For TSAR, identity map the kentry_vseg)
	160	error = hal_vmm_init( vmm );
	161
[415]	162	if( error )
	163	printk("\n[ERROR] in %s : cannot initialize GPT\n", __FUNCTION__ );
[409]	164
[1]	165	// initialize STACK allocator
	166	vmm->stack_mgr.bitmap = 0;
	167	vmm->stack_mgr.vpn_base = CONFIG_VMM_STACK_BASE;
	168
	169	// initialize MMAP allocator
[407]	170	vmm->mmap_mgr.vpn_base = CONFIG_VMM_HEAP_BASE;
	171	vmm->mmap_mgr.vpn_size = CONFIG_VMM_STACK_BASE - CONFIG_VMM_HEAP_BASE;
	172	vmm->mmap_mgr.first_free_vpn = CONFIG_VMM_HEAP_BASE;
[1]	173	uint32_t i;
	174	for( i = 0 ; i < 32 ; i++ ) list_root_init( &vmm->mmap_mgr.zombi_list[i] );
	175
[21]	176	// initialize instrumentation counters
[409]	177	vmm->pgfault_nr = 0;
[1]	178
[124]	179	hal_fence();
[1]	180
[407]	181	vmm_dmsg("\n[DBG] %s : core[%x,%d] exit for process %x / entry_point = %x\n",
	182	__FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid ,
	183	process->pid , process->vmm.entry_point );
[204]	184
[415]	185	return 0;
	186
[204]	187	} // end vmm_init()
	188
[407]	189	//////////////////////////////////////
	190	void vmm_display( process_t * process,
	191	bool_t mapping )
	192	{
	193	vmm_t * vmm = &process->vmm;
	194	gpt_t * gpt = &vmm->gpt;
	195
	196	printk("\n***** VSL and GPT for process %x\n\n",
	197	process->pid );
	198
	199	// get lock protecting the vseg list
[408]	200	remote_rwlock_rd_lock( XPTR( local_cxy , &vmm->vsegs_lock ) );
[407]	201
	202	// scan the list of vsegs
[408]	203	xptr_t root_xp = XPTR( local_cxy , &vmm->vsegs_root );
	204	xptr_t iter_xp;
	205	xptr_t vseg_xp;
[407]	206	vseg_t * vseg;
[408]	207	XLIST_FOREACH( root_xp , iter_xp )
[407]	208	{
[408]	209	vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist );
	210	vseg = (vseg_t *)GET_PTR( vseg_xp );
	211
[407]	212	printk(" - %s : base = %X / size = %X / npages = %d\n",
	213	vseg_type_str( vseg->type ) , vseg->min , vseg->max - vseg->min , vseg->vpn_size );
	214
	215	if( mapping )
	216	{
	217	vpn_t vpn;
	218	ppn_t ppn;
	219	uint32_t attr;
	220	vpn_t base = vseg->vpn_base;
	221	vpn_t size = vseg->vpn_size;
	222	for( vpn = base ; vpn < (base+size) ; vpn++ )
	223	{
	224	hal_gpt_get_pte( gpt , vpn , &attr , &ppn );
	225	if( attr & GPT_MAPPED )
	226	{
	227	printk(" . vpn = %X / attr = %X / ppn = %X\n", vpn , attr , ppn );
	228	}
	229	}
	230	}
	231	}
	232
	233	// release the lock
[408]	234	remote_rwlock_rd_unlock( XPTR( local_cxy , &vmm->vsegs_lock ) );
[407]	235
[408]	236	} // vmm_display()
	237
	238	/////////////////////i////////////////////
	239	void vmm_update_pte( process_t * process,
	240	vpn_t vpn,
	241	uint32_t attr,
	242	ppn_t ppn )
[23]	243	{
	244
[408]	245	xlist_entry_t * process_root_ptr;
	246	xptr_t process_root_xp;
	247	xptr_t process_iter_xp;
[23]	248
[408]	249	xptr_t remote_process_xp;
	250	cxy_t remote_process_cxy;
	251	process_t * remote_process_ptr;
	252	xptr_t remote_gpt_xp;
[23]	253
[408]	254	pid_t pid;
	255	cxy_t owner_cxy;
	256	lpid_t owner_lpid;
[23]	257
[408]	258	// get extended pointer on root of process copies xlist in owner cluster
	259	pid = process->pid;
	260	owner_cxy = CXY_FROM_PID( pid );
	261	owner_lpid = LPID_FROM_PID( pid );
	262	process_root_ptr = &LOCAL_CLUSTER->pmgr.copies_root[owner_lpid];
	263	process_root_xp = XPTR( owner_cxy , process_root_ptr );
[23]	264
[408]	265	// loop on destination process copies
	266	XLIST_FOREACH( process_root_xp , process_iter_xp )
	267	{
	268	// get cluster and local pointer on remote process
	269	remote_process_xp = XLIST_ELEMENT( process_iter_xp , process_t , copies_list );
	270	remote_process_ptr = (process_t *)GET_PTR( remote_process_xp );
	271	remote_process_cxy = GET_CXY( remote_process_xp );
[407]	272
[408]	273	// get extended pointer on remote gpt
	274	remote_gpt_xp = XPTR( remote_process_cxy , &remote_process_ptr->vmm.gpt );
	275
	276	hal_gpt_update_pte( remote_gpt_xp,
	277	vpn,
	278	attr,
	279	ppn );
	280	}
	281	} // end vmm_update_pte()
	282
	283	///////////////////////////////////////
	284	void vmm_set_cow( process_t * process )
	285	{
	286	vmm_t * vmm;
	287
	288	xlist_entry_t * process_root_ptr;
	289	xptr_t process_root_xp;
	290	xptr_t process_iter_xp;
	291
	292	xptr_t remote_process_xp;
	293	cxy_t remote_process_cxy;
	294	process_t * remote_process_ptr;
	295	xptr_t remote_gpt_xp;
	296
	297	xptr_t vseg_root_xp;
	298	xptr_t vseg_iter_xp;
	299
	300	xptr_t vseg_xp;
	301	vseg_t * vseg;
	302
	303	pid_t pid;
	304	cxy_t owner_cxy;
	305	lpid_t owner_lpid;
	306
	307	vmm_dmsg("\n[DBG] %s : core[%x,%d] enters for process %x\n",
	308	__FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , process->pid );
	309
	310	// check cluster is reference
	311	assert( (GET_CXY( process->ref_xp ) == local_cxy) , __FUNCTION__,
	312	"local cluster is not process reference cluster\n");
	313
	314	// get pointer on reference VMM
	315	vmm = &process->vmm;
	316
	317	// get extended pointer on root of process copies xlist in owner cluster
	318	pid = process->pid;
	319	owner_cxy = CXY_FROM_PID( pid );
	320	owner_lpid = LPID_FROM_PID( pid );
	321	process_root_ptr = &LOCAL_CLUSTER->pmgr.copies_root[owner_lpid];
	322	process_root_xp = XPTR( owner_cxy , process_root_ptr );
	323
	324	// get extended pointer on root of vsegs xlist from reference VMM
	325	vseg_root_xp = XPTR( local_cxy , &vmm->vsegs_root );
	326
	327	// loop on destination process copies
	328	XLIST_FOREACH( process_root_xp , process_iter_xp )
	329	{
	330	// get cluster and local pointer on remote process
	331	remote_process_xp = XLIST_ELEMENT( process_iter_xp , process_t , copies_list );
	332	remote_process_ptr = (process_t *)GET_PTR( remote_process_xp );
	333	remote_process_cxy = GET_CXY( remote_process_xp );
	334
	335	vmm_dmsg("\n[DBG] %s : core[%x,%d] handling process %x in cluster %x\n",
	336	__FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , process->pid , remote_process_cxy );
	337
	338	// get extended pointer on remote gpt
	339	remote_gpt_xp = XPTR( remote_process_cxy , &remote_process_ptr->vmm.gpt );
	340
	341	// loop on vsegs in (local) reference process VSL
	342	XLIST_FOREACH( vseg_root_xp , vseg_iter_xp )
	343	{
	344	// get pointer on vseg
	345	vseg_xp = XLIST_ELEMENT( vseg_iter_xp , vseg_t , xlist );
	346	vseg = (vseg_t *)GET_PTR( vseg_xp );
	347
	348	assert( (GET_CXY( vseg_xp ) == local_cxy) , __FUNCTION__,
	349	"all vsegs in reference VSL must be local\n" );
	350
	351	// get vseg type, base and size
	352	uint32_t type = vseg->type;
	353	vpn_t vpn_base = vseg->vpn_base;
	354	vpn_t vpn_size = vseg->vpn_size;
	355
	356	vmm_dmsg("\n[DBG] %s : core[%x,%d] handling vseg %s / vpn_base = %x / vpn_size = %x\n",
	357	__FUNCTION__, local_cxy, CURRENT_THREAD->core->lid, vseg_type_str(type), vpn_base, vpn_size );
	358
	359	// set COW flag on the remote GPT depending on vseg type
	360	if( (type == VSEG_TYPE_DATA) \|\|
	361	(type == VSEG_TYPE_ANON) \|\|
	362	(type == VSEG_TYPE_REMOTE) )
	363	{
	364	hal_gpt_flip_cow( true, // set_cow
	365	remote_gpt_xp,
	366	vpn_base,
	367	vpn_size );
	368	}
	369	} // en loop on vsegs
	370	} // end loop on process copies
	371
	372	vmm_dmsg("\n[DBG] %s : core[%x,%d] exit for process %x\n",
	373	__FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , process->pid );
	374
	375	} // end vmm_set-cow()
	376
	377	/////////////////////////////////////////////////
	378	error_t vmm_fork_copy( process_t * child_process,
	379	xptr_t parent_process_xp )
	380	{
	381	error_t error;
	382	cxy_t parent_cxy;
	383	process_t * parent_process;
	384	vmm_t * parent_vmm;
	385	xptr_t parent_lock_xp;
	386	vmm_t * child_vmm;
	387	xptr_t iter_xp;
	388	xptr_t parent_vseg_xp;
	389	vseg_t * parent_vseg;
	390	vseg_t * child_vseg;
	391	uint32_t type;
	392	bool_t cow;
	393	vpn_t vpn;
	394	vpn_t vpn_base;
	395	vpn_t vpn_size;
	396	xptr_t page_xp;
	397	page_t * page_ptr;
	398	cxy_t page_cxy;
	399	xptr_t parent_root_xp;
	400	bool_t mapped;
	401	ppn_t ppn;
	402
	403	vmm_dmsg("\n[DBG] %s : core[%x,%d] enter\n",
	404	__FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid );
	405
	406	// get parent process cluster and local pointer
	407	parent_cxy = GET_CXY( parent_process_xp );
	408	parent_process = (process_t *)GET_PTR( parent_process_xp );
	409
	410	// get local pointers on parent and child VMM
	411	parent_vmm = &parent_process->vmm;
	412	child_vmm = &child_process->vmm;
	413
	414	// get extended pointer on lock protecting the parent VSL
	415	parent_lock_xp = XPTR( parent_cxy , &parent_vmm->vsegs_lock );
	416
	417	// initialize the lock protecting the child VSL
	418	remote_rwlock_init( XPTR( local_cxy , &child_vmm->vsegs_lock ) );
	419
	420	// initialize the child VSL as empty
	421	xlist_root_init( XPTR( local_cxy, &child_vmm->vsegs_root ) );
	422	child_vmm->vsegs_nr = 0;
	423
[415]	424	// create child GPT
[408]	425	error = hal_gpt_create( &child_vmm->gpt );
[415]	426
[407]	427	if( error )
	428	{
[408]	429	printk("\n[ERROR] in %s : cannot create GPT\n", __FUNCTION__ );
	430	return -1;
[407]	431	}
	432
[408]	433	// build extended pointer on parent VSL
	434	parent_root_xp = XPTR( parent_cxy , &parent_vmm->vsegs_root );
	435
[415]	436	// take the lock protecting the parent VSL
	437	remote_rwlock_rd_lock( parent_lock_xp );
	438
[408]	439	// loop on parent VSL xlist
	440	XLIST_FOREACH( parent_root_xp , iter_xp )
[23]	441	{
[408]	442	// get local and extended pointers on current parent vseg
	443	parent_vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist );
	444	parent_vseg = (vseg_t *)GET_PTR( parent_vseg_xp );
[23]	445
[408]	446	// get vseg type
	447	type = hal_remote_lw( XPTR( parent_cxy , &parent_vseg->type ) );
	448
[23]	449
[408]	450	vmm_dmsg("\n[DBG] %s : core[%x,%d] found parent vseg %s / vpn_base = %x\n",
	451	__FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , vseg_type_str(type),
	452	hal_remote_lw( XPTR( parent_cxy , &parent_vseg->vpn_base ) ) );
	453
	454	// all parent vsegs - but STACK - must be copied in child VSL
	455	if( type != VSEG_TYPE_STACK )
[23]	456	{
[408]	457	// allocate memory for a new child vseg
	458	child_vseg = vseg_alloc();
	459	if( child_vseg == NULL ) // release all allocated vsegs
[23]	460	{
[408]	461	vmm_destroy( child_process );
	462	printk("\n[ERROR] in %s : cannot create vseg for child\n", __FUNCTION__ );
	463	return -1;
[23]	464	}
	465
[408]	466	// copy parent vseg to child vseg
	467	vseg_init_from_ref( child_vseg , parent_vseg_xp );
[23]	468
[408]	469	// register child vseg in child VSL
	470	vseg_attach( child_vmm , child_vseg );
[407]	471
[408]	472	vmm_dmsg("\n[DBG] %s : core[%x,%d] copied to child VSL : vseg %s / vpn_base = %x\n",
	473	__FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , vseg_type_str(type),
	474	hal_remote_lw( XPTR( parent_cxy , &parent_vseg->vpn_base ) ) );
[23]	475
[408]	476	// copy DATA, MMAP, REMOTE, FILE parent GPT entries to child GPT
	477	if( type != VSEG_TYPE_CODE )
	478	{
	479	// activate the COW for DATA, MMAP, REMOTE vsegs only
	480	cow = ( type != VSEG_TYPE_FILE );
[23]	481
[408]	482	vpn_base = child_vseg->vpn_base;
	483	vpn_size = child_vseg->vpn_size;
[23]	484
[408]	485	// scan pages in parent vseg
	486	for( vpn = vpn_base ; vpn < (vpn_base + vpn_size) ; vpn++ )
	487	{
	488	error = hal_gpt_pte_copy( &child_vmm->gpt,
	489	XPTR( parent_cxy , &parent_vmm->gpt ),
	490	vpn,
	491	cow,
	492	&ppn,
	493	&mapped );
	494	if( error )
	495	{
	496	vmm_destroy( child_process );
	497	printk("\n[ERROR] in %s : cannot copy GPT\n", __FUNCTION__ );
	498	return -1;
	499	}
	500
	501	// increment page descriptor fork_nr for the referenced page if mapped
	502	if( mapped )
	503	{
	504	page_xp = ppm_ppn2page( ppn );
	505	page_cxy = GET_CXY( page_xp );
	506	page_ptr = (page_t *)GET_PTR( page_xp );
	507	hal_remote_atomic_add( XPTR( page_cxy , &page_ptr->fork_nr ) , 1 );
	508
	509	vmm_dmsg("\n[DBG] %s : core[%x,%d] copied to child GPT : vpn %x\n",
	510	__FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , vpn );
	511
	512	}
	513	}
	514	} // end if no code & no stack
	515	} // end if no stack
	516	} // end loop on vsegs
	517
	518	// release the parent vsegs lock
	519	remote_rwlock_rd_unlock( parent_lock_xp );
	520
[415]	521	// initialize child GPT (architecture specic)
	522	// => For TSAR, identity map the kentry_vseg
	523	error = hal_vmm_init( child_vmm );
	524
	525	if( error )
	526	{
	527	printk("\n[ERROR] in %s : cannot create GPT\n", __FUNCTION__ );
	528	return -1;
	529	}
	530
[408]	531	// initialize the child VMM STACK allocator
	532	child_vmm->stack_mgr.bitmap = 0;
	533	child_vmm->stack_mgr.vpn_base = CONFIG_VMM_STACK_BASE;
	534
	535	// initialize the child VMM MMAP allocator
[23]	536	uint32_t i;
[408]	537	child_vmm->mmap_mgr.vpn_base = CONFIG_VMM_HEAP_BASE;
	538	child_vmm->mmap_mgr.vpn_size = CONFIG_VMM_STACK_BASE - CONFIG_VMM_HEAP_BASE;
	539	child_vmm->mmap_mgr.first_free_vpn = CONFIG_VMM_HEAP_BASE;
	540	for( i = 0 ; i < 32 ; i++ ) list_root_init( &child_vmm->mmap_mgr.zombi_list[i] );
[23]	541
[178]	542	// initialize instrumentation counters
[408]	543	child_vmm->pgfault_nr = 0;
[23]	544
[408]	545	// copy base addresses from parent VMM to child VMM
	546	child_vmm->kent_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->kent_vpn_base));
	547	child_vmm->args_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->args_vpn_base));
	548	child_vmm->envs_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->envs_vpn_base));
	549	child_vmm->heap_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->heap_vpn_base));
	550	child_vmm->code_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->code_vpn_base));
	551	child_vmm->data_vpn_base = (vpn_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->data_vpn_base));
[23]	552
[408]	553	child_vmm->entry_point = (intptr_t)hal_remote_lpt(XPTR(parent_cxy, &parent_vmm->entry_point));
[23]	554
[124]	555	hal_fence();
[23]	556
	557	return 0;
	558
[408]	559	} // vmm_fork_copy()
[204]	560
[1]	561	///////////////////////////////////////
	562	void vmm_destroy( process_t * process )
	563	{
[408]	564	xptr_t vseg_xp;
[1]	565	vseg_t * vseg;
	566
[416]	567	vmm_dmsg("\n[DBG] %s : core[%x,%d] enter\n",
	568	__FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid );
	569
[1]	570	// get pointer on VMM
	571	vmm_t * vmm = &process->vmm;
	572
[408]	573	// get extended pointer on VSL root and VSL lock
	574	xptr_t root_xp = XPTR( local_cxy , &vmm->vsegs_root );
	575	xptr_t lock_xp = XPTR( local_cxy , &vmm->vsegs_lock );
	576
[1]	577	// get lock protecting vseg list
[408]	578	remote_rwlock_wr_lock( lock_xp );
[1]	579
[409]	580	// remove all user vsegs registered in VSL
[408]	581	while( !xlist_is_empty( root_xp ) )
[1]	582	{
[409]	583	// get pointer on first vseg in VSL
[408]	584	vseg_xp = XLIST_FIRST_ELEMENT( root_xp , vseg_t , xlist );
	585	vseg = (vseg_t *)GET_PTR( vseg_xp );
[409]	586
	587	// unmap and release all pages
	588	vmm_unmap_vseg( process , vseg );
	589
	590	// remove vseg from VSL
[1]	591	vseg_detach( vmm , vseg );
[409]	592
	593	// release memory allocated to vseg descriptor
[1]	594	vseg_free( vseg );
	595	}
	596
	597	// release lock
[408]	598	remote_rwlock_wr_unlock( lock_xp );
[1]	599
	600	// remove all vsegs from zombi_lists in MMAP allocator
	601	uint32_t i;
	602	for( i = 0 ; i<32 ; i++ )
	603	{
	604	while( !list_is_empty( &vmm->mmap_mgr.zombi_list[i] ) )
	605	{
[408]	606	vseg = LIST_FIRST( &vmm->mmap_mgr.zombi_list[i] , vseg_t , zlist );
[1]	607	vseg_detach( vmm , vseg );
	608	vseg_free( vseg );
	609	}
	610	}
	611
[409]	612	// release memory allocated to the GPT itself
[1]	613	hal_gpt_destroy( &vmm->gpt );
	614
[416]	615	vmm_dmsg("\n[DBG] %s : core[%x,%d] exit\n",
	616	__FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid );
	617
[204]	618	} // end vmm_destroy()
	619
[1]	620	/////////////////////////////////////////////////
	621	vseg_t * vmm_check_conflict( process_t * process,
[21]	622	vpn_t vpn_base,
[1]	623	vpn_t vpn_size )
	624	{
	625	vmm_t * vmm = &process->vmm;
[408]	626
	627	// scan the VSL
[1]	628	vseg_t * vseg;
[408]	629	xptr_t iter_xp;
	630	xptr_t vseg_xp;
	631	xptr_t root_xp = XPTR( local_cxy , &vmm->vsegs_root );
[1]	632
[408]	633	XLIST_FOREACH( root_xp , iter_xp )
[1]	634	{
[408]	635	vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist );
	636	vseg = (vseg_t *)GET_PTR( vseg_xp );
[204]	637
[21]	638	if( ((vpn_base + vpn_size) > vseg->vpn_base) &&
	639	(vpn_base < (vseg->vpn_base + vseg->vpn_size)) ) return vseg;
[1]	640	}
	641	return NULL;
	642
[204]	643	} // end vmm_check_conflict()
	644
[1]	645	////////////////////////////////////////////////////////////////////////////////////////////
	646	// This static function is called by the vmm_create_vseg() function, and implements
	647	// the VMM stack_vseg specific allocator.
	648	////////////////////////////////////////////////////////////////////////////////////////////
	649	// @ vmm : pointer on VMM.
[21]	650	// @ vpn_base : (return value) first allocated page
[1]	651	// @ vpn_size : (return value) number of allocated pages
	652	////////////////////////////////////////////////////////////////////////////////////////////
	653	static error_t vmm_stack_alloc( vmm_t * vmm,
	654	vpn_t * vpn_base,
	655	vpn_t * vpn_size )
	656	{
	657	// get stack allocator pointer
	658	stack_mgr_t * mgr = &vmm->stack_mgr;
	659
	660	// get lock on stack allocator
	661	spinlock_lock( &mgr->lock );
	662
	663	// get first free slot index in bitmap
	664	int32_t index = bitmap_ffc( &mgr->bitmap , 4 );
[179]	665	if( (index < 0) \|\| (index > 31) )
	666	{
	667	spinlock_unlock( &mgr->lock );
	668	return ENOMEM;
	669	}
[1]	670
	671	// update bitmap
	672	bitmap_set( &mgr->bitmap , index );
[21]	673
[1]	674	// release lock on stack allocator
	675	spinlock_unlock( &mgr->lock );
	676
[21]	677	// returns vpn_base, vpn_size (one page non allocated)
[1]	678	vpn_base = mgr->vpn_base + index CONFIG_VMM_STACK_SIZE + 1;
	679	*vpn_size = CONFIG_VMM_STACK_SIZE - 1;
	680	return 0;
	681
[204]	682	} // end vmm_stack_alloc()
	683
[1]	684	////////////////////////////////////////////////////////////////////////////////////////////
	685	// This static function is called by the vmm_create_vseg() function, and implements
	686	// the VMM MMAP specific allocator.
	687	////////////////////////////////////////////////////////////////////////////////////////////
	688	// @ vmm : [in] pointer on VMM.
	689	// @ npages : [in] requested number of pages.
[21]	690	// @ vpn_base : [out] first allocated page.
[1]	691	// @ vpn_size : [out] actual number of allocated pages.
	692	////////////////////////////////////////////////////////////////////////////////////////////
	693	static error_t vmm_mmap_alloc( vmm_t * vmm,
	694	vpn_t npages,
	695	vpn_t * vpn_base,
	696	vpn_t * vpn_size )
	697	{
	698	uint32_t index;
	699	vseg_t * vseg;
	700	vpn_t base;
	701	vpn_t size;
[21]	702	vpn_t free;
[1]	703
[21]	704	// mmap vseg size must be power of 2
[1]	705	// compute actual size and index in zombi_list array
	706	size = POW2_ROUNDUP( npages );
	707	index = bits_log2( size );
	708
	709	// get mmap allocator pointer
	710	mmap_mgr_t * mgr = &vmm->mmap_mgr;
	711
	712	// get lock on mmap allocator
	713	spinlock_lock( &mgr->lock );
	714
	715	// get vseg from zombi_list or from mmap zone
	716	if( list_is_empty( &mgr->zombi_list[index] ) ) // from mmap zone
	717	{
	718	// check overflow
	719	free = mgr->first_free_vpn;
	720	if( (free + size) > mgr->vpn_size ) return ENOMEM;
	721
	722	// update STACK allocator
	723	mgr->first_free_vpn += size;
	724
	725	// compute base
	726	base = free;
	727	}
	728	else // from zombi_list
	729	{
	730	// get pointer on zombi vseg from zombi_list
[408]	731	vseg = LIST_FIRST( &mgr->zombi_list[index] , vseg_t , zlist );
[1]	732
	733	// remove vseg from free-list
[408]	734	list_unlink( &vseg->zlist );
[1]	735
	736	// compute base
	737	base = vseg->vpn_base;
[21]	738	}
	739
[1]	740	// release lock on mmap allocator
	741	spinlock_unlock( &mgr->lock );
	742
	743	// returns vpn_base, vpn_size
	744	*vpn_base = base;
	745	*vpn_size = size;
	746	return 0;
	747
[204]	748	} // end vmm_mmap_alloc()
	749
[407]	750	////////////////////////////////////////////////
	751	vseg_t * vmm_create_vseg( process_t * process,
	752	vseg_type_t type,
	753	intptr_t base,
	754	uint32_t size,
	755	uint32_t file_offset,
	756	uint32_t file_size,
	757	xptr_t mapper_xp,
	758	cxy_t cxy )
[1]	759	{
	760	vseg_t * vseg; // created vseg pointer
[204]	761	vpn_t vpn_base; // first page index
[1]	762	vpn_t vpn_size; // number of pages
	763	error_t error;
	764
[407]	765	vmm_dmsg("\n[DBG] %s : core[%x,%d] enters / process %x / base %x / size %x / %s / cxy = %x\n",
	766	__FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid ,
	767	process->pid , base , size , vseg_type_str(type) , cxy );
[21]	768
[407]	769	// get pointer on VMM
	770	vmm_t * vmm = &process->vmm;
[21]	771
[204]	772	// compute base, size, vpn_base, vpn_size, depending on vseg type
[407]	773	// we use the VMM specific allocators for "stack", "file", "anon", & "remote" vsegs
[1]	774	if( type == VSEG_TYPE_STACK )
	775	{
	776	// get vpn_base and vpn_size from STACK allocator
	777	error = vmm_stack_alloc( vmm , &vpn_base , &vpn_size );
	778	if( error )
	779	{
[407]	780	printk("\n[ERROR] in %s : no space for stack vseg / process %x in cluster %x\n",
	781	__FUNCTION__ , process->pid , local_cxy );
[1]	782	return NULL;
	783	}
	784
	785	// compute vseg base and size from vpn_base and vpn_size
	786	base = vpn_base << CONFIG_PPM_PAGE_SHIFT;
	787	size = vpn_size << CONFIG_PPM_PAGE_SHIFT;
	788	}
[21]	789	else if( (type == VSEG_TYPE_ANON) \|\|
	790	(type == VSEG_TYPE_FILE) \|\|
[1]	791	(type == VSEG_TYPE_REMOTE) )
	792	{
	793	// get vpn_base and vpn_size from MMAP allocator
	794	vpn_t npages = size >> CONFIG_PPM_PAGE_SHIFT;
	795	error = vmm_mmap_alloc( vmm , npages , &vpn_base , &vpn_size );
	796	if( error )
	797	{
	798	printk("\n[ERROR] in %s : no vspace for mmap vseg / process %x in cluster %x\n",
	799	__FUNCTION__ , process->pid , local_cxy );
	800	return NULL;
	801	}
	802
	803	// compute vseg base and size from vpn_base and vpn_size
	804	base = vpn_base << CONFIG_PPM_PAGE_SHIFT;
	805	size = vpn_size << CONFIG_PPM_PAGE_SHIFT;
	806	}
	807	else
	808	{
[204]	809	uint32_t vpn_min = base >> CONFIG_PPM_PAGE_SHIFT;
	810	uint32_t vpn_max = (base + size - 1) >> CONFIG_PPM_PAGE_SHIFT;
	811
	812	vpn_base = vpn_min;
	813	vpn_size = vpn_max - vpn_min + 1;
[1]	814	}
	815
	816	// check collisions
	817	vseg = vmm_check_conflict( process , vpn_base , vpn_size );
	818	if( vseg != NULL )
	819	{
[21]	820	printk("\n[ERROR] in %s for process %x : new vseg [vpn_base = %x / vpn_size = %x]\n"
[1]	821	" overlap existing vseg [vpn_base = %x / vpn_size = %x]\n",
[407]	822	__FUNCTION__ , process->pid, vpn_base, vpn_size, vseg->vpn_base, vseg->vpn_size );
[1]	823	return NULL;
	824	}
	825
	826	// allocate physical memory for vseg descriptor
	827	vseg = vseg_alloc();
	828	if( vseg == NULL )
	829	{
	830	printk("\n[ERROR] in %s for process %x : cannot allocate memory for vseg\n",
[407]	831	__FUNCTION__ , process->pid );
[1]	832	return NULL;
	833	}
	834
	835	// initialize vseg descriptor
[407]	836	vseg_init( vseg,
	837	type,
	838	base,
	839	size,
	840	vpn_base,
	841	vpn_size,
	842	file_offset,
	843	file_size,
	844	mapper_xp,
	845	cxy );
[1]	846
[408]	847	// attach vseg to VSL
	848	xptr_t lock_xp = XPTR( local_cxy , &vmm->vsegs_lock );
	849	remote_rwlock_wr_lock( lock_xp );
[1]	850	vseg_attach( vmm , vseg );
[408]	851	remote_rwlock_wr_unlock( lock_xp );
[1]	852
[407]	853	vmm_dmsg("\n[DBG] %s : core[%x,%d] exit / process %x / base %x / size %x / type %s\n",
	854	__FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid ,
	855	process->pid , base , size , vseg_type_str(type) );
[21]	856
[1]	857	return vseg;
	858
[406]	859	} // vmm_create_vseg()
	860
[1]	861	/////////////////////////////////////
	862	void vmm_remove_vseg( vseg_t * vseg )
	863	{
	864	// get pointers on calling process and VMM
	865	thread_t * this = CURRENT_THREAD;
	866	process_t * process = this->process;
	867	vmm_t * vmm = &this->process->vmm;
	868	uint32_t type = vseg->type;
	869
[408]	870	// detach vseg from VSL
	871	xptr_t lock_xp = XPTR( local_cxy , &vmm->vsegs_lock );
	872	remote_rwlock_wr_lock( lock_xp );
	873	vseg_detach( &process->vmm , vseg );
	874	remote_rwlock_wr_unlock( lock_xp );
[1]	875
	876	// release the stack slot to VMM stack allocator if STACK type
	877	if( type == VSEG_TYPE_STACK )
	878	{
	879	// get pointer on stack allocator
	880	stack_mgr_t * mgr = &vmm->stack_mgr;
	881
	882	// compute slot index
	883	uint32_t index = ((vseg->vpn_base - mgr->vpn_base - 1) / CONFIG_VMM_STACK_SIZE);
	884
	885	// update stacks_bitmap
	886	spinlock_lock( &mgr->lock );
	887	bitmap_clear( &mgr->bitmap , index );
	888	spinlock_unlock( &mgr->lock );
	889	}
	890
	891	// release the vseg to VMM mmap allocator if MMAP type
	892	if( (type == VSEG_TYPE_ANON) \|\| (type == VSEG_TYPE_FILE) \|\| (type == VSEG_TYPE_REMOTE) )
	893	{
	894	// get pointer on mmap allocator
	895	mmap_mgr_t * mgr = &vmm->mmap_mgr;
	896
	897	// compute zombi_list index
	898	uint32_t index = bits_log2( vseg->vpn_size );
	899
	900	// update zombi_list
	901	spinlock_lock( &mgr->lock );
[408]	902	list_add_first( &mgr->zombi_list[index] , &vseg->zlist );
[1]	903	spinlock_unlock( &mgr->lock );
	904	}
	905
	906	// release physical memory allocated for vseg descriptor if no MMAP type
	907	if( (type != VSEG_TYPE_ANON) && (type != VSEG_TYPE_FILE) && (type != VSEG_TYPE_REMOTE) )
	908	{
	909	vseg_free( vseg );
	910	}
[407]	911	} // end vmm_remove_vseg()
[1]	912
[68]	913	//////////////////////////////////////////////
	914	error_t vmm_map_kernel_vseg( vseg_t * vseg,
	915	uint32_t attr )
[1]	916	{
	917	vpn_t vpn; // VPN of PTE to be set
	918	vpn_t vpn_min; // VPN of first PTE to be set
	919	vpn_t vpn_max; // VPN of last PTE to be set (excluded)
	920	ppn_t ppn; // PPN of allocated physical page
	921	uint32_t order; // ln( number of small pages for one single PTE )
	922	page_t * page;
	923	error_t error;
	924
[68]	925	// check vseg type : must be a kernel vseg
[1]	926	uint32_t type = vseg->type;
[68]	927	assert( ((type==VSEG_TYPE_KCODE) \|\| (type==VSEG_TYPE_KDATA) \|\| (type==VSEG_TYPE_KDEV)),
	928	__FUNCTION__ , "not a kernel vseg\n" );
[1]	929
	930	// get pointer on page table
	931	gpt_t * gpt = &process_zero.vmm.gpt;
	932
[21]	933	// define number of small pages per PTE
[1]	934	if( attr & GPT_SMALL ) order = 0; // 1 small page
	935	else order = 9; // 512 small pages
	936
	937	// loop on pages in vseg
	938	vpn_min = vseg->vpn_base;
	939	vpn_max = vpn_min + vseg->vpn_size;
	940	for( vpn = vpn_min ; vpn < vpn_max ; vpn++ )
	941	{
[68]	942	// allocate a physical page from local PPM
[1]	943	kmem_req_t req;
	944	req.type = KMEM_PAGE;
	945	req.size = order;
	946	req.flags = AF_KERNEL \| AF_ZERO;
	947	page = (page_t *)kmem_alloc( &req );
[21]	948	if( page == NULL )
[1]	949	{
	950	printk("\n[ERROR] in %s : cannot allocate physical memory\n", __FUNCTION__ );
	951	return ENOMEM;
	952	}
	953
	954	// set page table entry
[315]	955	ppn = ppm_page2ppn( XPTR( local_cxy , page ) );
[408]	956	error = hal_gpt_set_pte( gpt,
	957	vpn,
	958	attr,
	959	ppn );
[21]	960	if( error )
[1]	961	{
	962	printk("\n[ERROR] in %s : cannot register PPE\n", __FUNCTION__ );
	963	return ENOMEM;
	964	}
	965	}
[21]	966
[1]	967	return 0;
	968
[408]	969	} // end vmm_map_kernel_vseg()
	970
[1]	971	/////////////////////////////////////////
	972	void vmm_unmap_vseg( process_t * process,
	973	vseg_t * vseg )
	974	{
[21]	975	vpn_t vpn; // VPN of current PTE
	976	vpn_t vpn_min; // VPN of first PTE
[1]	977	vpn_t vpn_max; // VPN of last PTE (excluded)
[409]	978	ppn_t ppn; // current PTE ppn value
	979	uint32_t attr; // current PTE attributes
	980	kmem_req_t req; // request to release memory
	981	xptr_t page_xp; // extended pointer on page descriptor
	982	cxy_t page_cxy; // page descriptor cluster
	983	page_t * page_ptr; // page descriptor pointer
[1]	984
[409]	985	vmm_dmsg("\n[DBG] %s : core[%x, %d] enter / process %x / vseg %s / base %x / cycle %d\n",
	986	__FUNCTION__, local_cxy, CURRENT_THREAD->core->lid, process->pid ,
	987	vseg_type_str( vseg->type ), vseg->vpn_base, (uint32_t)hal_get_cycles() );
	988
	989	// get pointer on process GPT
[1]	990	gpt_t * gpt = &process->vmm.gpt;
	991
	992	// loop on pages in vseg
	993	vpn_min = vseg->vpn_base;
	994	vpn_max = vpn_min + vseg->vpn_size;
	995	for( vpn = vpn_min ; vpn < vpn_max ; vpn++ )
	996	{
[409]	997	// get GPT entry
	998	hal_gpt_get_pte( gpt , vpn , &attr , &ppn );
	999
	1000	if( attr & GPT_MAPPED ) // entry is mapped
	1001	{
	1002	// check small page
	1003	assert( (attr & GPT_SMALL) , __FUNCTION__ ,
	1004	"an user vseg must use small pages" );
	1005
	1006	// unmap GPT entry
	1007	hal_gpt_reset_pte( gpt , vpn );
	1008
	1009	// release memory if not identity mapped
	1010	if( (vseg->flags & VSEG_IDENT) == 0 )
	1011	{
	1012	// get extended pointer on page descriptor
	1013	page_xp = ppm_ppn2page( ppn );
	1014	page_cxy = GET_CXY( page_xp );
	1015	page_ptr = (page_t *)GET_PTR( page_xp );
	1016
	1017	// release physical page to relevant cluster
	1018	if( page_cxy == local_cxy ) // local cluster
	1019	{
	1020	req.type = KMEM_PAGE;
	1021	req.ptr = page_ptr;
	1022	kmem_free( &req );
	1023	}
	1024	else // remote cluster
	1025	{
	1026	rpc_pmem_release_pages_client( page_cxy , page_ptr );
	1027	}
	1028	}
	1029	}
[1]	1030	}
[409]	1031	} // end vmm_unmap_vseg()
[1]	1032
[407]	1033	//////////////////////////////////////////////////////////////////////////////////////////
[406]	1034	// This low-level static function is called by the vmm_get_vseg() and vmm_resize_vseg()
	1035	// functions. It scan the list of registered vsegs to find the unique vseg containing
	1036	// a given virtual address.
[407]	1037	//////////////////////////////////////////////////////////////////////////////////////////
[406]	1038	// @ vmm : pointer on the process VMM.
	1039	// @ vaddr : virtual address.
	1040	// @ return vseg pointer if success / return NULL if not found.
[407]	1041	//////////////////////////////////////////////////////////////////////////////////////////
[406]	1042	static vseg_t * vseg_from_vaddr( vmm_t * vmm,
	1043	intptr_t vaddr )
	1044	{
[408]	1045	xptr_t iter_xp;
	1046	xptr_t vseg_xp;
	1047	vseg_t * vseg;
[406]	1048
[408]	1049	// get extended pointers on VSL lock and root
	1050	xptr_t lock_xp = XPTR( local_cxy , &vmm->vsegs_lock );
	1051	xptr_t root_xp = XPTR( local_cxy , &vmm->vsegs_root );
[406]	1052
[408]	1053	// get lock protecting the VSL
	1054	remote_rwlock_rd_lock( lock_xp );
	1055
	1056	// scan the list of vsegs in VSL
	1057	XLIST_FOREACH( root_xp , iter_xp )
[406]	1058	{
[408]	1059	vseg_xp = XLIST_ELEMENT( iter_xp , vseg_t , xlist );
	1060	vseg = (vseg_t *)GET_PTR( vseg_xp );
	1061	if( (vaddr >= vseg->min) && (vaddr < vseg->max) )
	1062	{
	1063	// return success
	1064	remote_rwlock_rd_unlock( lock_xp );
	1065	return vseg;
	1066	}
[406]	1067	}
	1068
[408]	1069	// return failure
	1070	remote_rwlock_rd_unlock( lock_xp );
	1071	return NULL;
[406]	1072
[408]	1073	} // end vseg_from_vaddr()
[406]	1074
[1]	1075	/////////////////////////////////////////////
	1076	error_t vmm_resize_vseg( process_t * process,
	1077	intptr_t base,
	1078	intptr_t size )
	1079	{
[406]	1080	error_t error;
	1081	vseg_t * new;
	1082	vpn_t vpn_min;
	1083	vpn_t vpn_max;
[1]	1084
	1085	// get pointer on process VMM
	1086	vmm_t * vmm = &process->vmm;
	1087
	1088	intptr_t addr_min = base;
	1089	intptr_t addr_max = base + size;
	1090
	1091	// get pointer on vseg
[406]	1092	vseg_t * vseg = vseg_from_vaddr( vmm , base );
[1]	1093
	1094	if( vseg == NULL) return EINVAL;
[21]	1095
[408]	1096	// get extended pointer on VSL lock
	1097	xptr_t lock_xp = XPTR( local_cxy , &vmm->vsegs_lock );
[21]	1098
[408]	1099	// get lock protecting VSL
	1100	remote_rwlock_wr_lock( lock_xp );
	1101
[1]	1102	if( (vseg->min > addr_min) \|\| (vseg->max < addr_max) ) // region not included in vseg
	1103	{
	1104	error = EINVAL;
	1105	}
	1106	else if( (vseg->min == addr_min) && (vseg->max == addr_max) ) // vseg must be removed
	1107	{
	1108	vmm_remove_vseg( vseg );
	1109	error = 0;
	1110	}
[406]	1111	else if( vseg->min == addr_min ) // vseg must be resized
[1]	1112	{
[406]	1113	// update vseg base address
	1114	vseg->min = addr_max;
	1115
	1116	// update vpn_base and vpn_size
	1117	vpn_min = vseg->min >> CONFIG_PPM_PAGE_SHIFT;
	1118	vpn_max = (vseg->max - 1) >> CONFIG_PPM_PAGE_SHIFT;
	1119	vseg->vpn_base = vpn_min;
	1120	vseg->vpn_size = vpn_max - vpn_min + 1;
	1121	error = 0;
[1]	1122	}
[406]	1123	else if( vseg->max == addr_max ) // vseg must be resized
[1]	1124	{
[406]	1125	// update vseg max address
	1126	vseg->max = addr_min;
	1127
	1128	// update vpn_base and vpn_size
	1129	vpn_min = vseg->min >> CONFIG_PPM_PAGE_SHIFT;
	1130	vpn_max = (vseg->max - 1) >> CONFIG_PPM_PAGE_SHIFT;
	1131	vseg->vpn_base = vpn_min;
	1132	vseg->vpn_size = vpn_max - vpn_min + 1;
	1133	error = 0;
[1]	1134	}
[406]	1135	else // vseg cut in three regions
[1]	1136	{
[406]	1137	// resize existing vseg
	1138	vseg->max = addr_min;
	1139
	1140	// update vpn_base and vpn_size
	1141	vpn_min = vseg->min >> CONFIG_PPM_PAGE_SHIFT;
	1142	vpn_max = (vseg->max - 1) >> CONFIG_PPM_PAGE_SHIFT;
	1143	vseg->vpn_base = vpn_min;
	1144	vseg->vpn_size = vpn_max - vpn_min + 1;
	1145
	1146	// create new vseg
[407]	1147	new = vmm_create_vseg( process,
	1148	vseg->type,
	1149	addr_min,
	1150	(vseg->max - addr_max),
	1151	vseg->file_offset,
	1152	vseg->file_size,
	1153	vseg->mapper_xp,
	1154	vseg->cxy );
	1155
[406]	1156	if( new == NULL ) error = EINVAL;
	1157	else error = 0;
[1]	1158	}
	1159
	1160	// release VMM lock
[408]	1161	remote_rwlock_wr_unlock( lock_xp );
[1]	1162
	1163	return error;
	1164
[406]	1165	} // vmm_resize_vseg()
	1166
[1]	1167	///////////////////////////////////////////
[388]	1168	error_t vmm_get_vseg( process_t * process,
[394]	1169	intptr_t vaddr,
[388]	1170	vseg_t ** found_vseg )
[1]	1171	{
[406]	1172	vmm_t * vmm = &process->vmm;
[1]	1173
[406]	1174	// get vseg from vaddr
	1175	vseg_t * vseg = vseg_from_vaddr( vmm , vaddr );
[1]	1176
[388]	1177	if( vseg == NULL ) // vseg not found in local cluster => try to get it from ref
	1178	{
	1179	// get extended pointer on reference process
	1180	xptr_t ref_xp = process->ref_xp;
[1]	1181
[388]	1182	// get cluster and local pointer on reference process
	1183	cxy_t ref_cxy = GET_CXY( ref_xp );
	1184	process_t * ref_ptr = (process_t *)GET_PTR( ref_xp );
	1185
	1186	if( local_cxy == ref_cxy ) return -1; // local cluster is the reference
	1187
	1188	// get extended pointer on reference vseg
	1189	xptr_t vseg_xp;
	1190	error_t error;
[406]	1191
[394]	1192	rpc_vmm_get_vseg_client( ref_cxy , ref_ptr , vaddr , &vseg_xp , &error );
[388]	1193
	1194	if( error ) return -1; // vseg not found => illegal user vaddr
	1195
	1196	// allocate a vseg in local cluster
	1197	vseg = vseg_alloc();
	1198
[406]	1199	if( vseg == NULL ) return -1;
[388]	1200
	1201	// initialise local vseg from reference
	1202	vseg_init_from_ref( vseg , vseg_xp );
	1203
	1204	// register local vseg in local VMM
[406]	1205	vseg_attach( &process->vmm , vseg );
[388]	1206	}
	1207
	1208	// success
	1209	*found_vseg = vseg;
[394]	1210	return 0;
[388]	1211
	1212	} // end vmm_get_vseg()
	1213
[407]	1214	//////////////////////////////////////////////////////////////////////////////////////
	1215	// This static function compute the target cluster to allocate a physical page
	1216	// for a given <vpn> in a given <vseg>, allocates the page (with an RPC if required)
	1217	// and returns an extended pointer on the allocated page descriptor.
	1218	// The vseg cannot have the FILE type.
	1219	//////////////////////////////////////////////////////////////////////////////////////
	1220	static xptr_t vmm_page_allocate( vseg_t * vseg,
	1221	vpn_t vpn )
	1222	{
	1223	// compute target cluster
	1224	page_t * page_ptr;
	1225	cxy_t page_cxy;
	1226	kmem_req_t req;
	1227
	1228	uint32_t type = vseg->type;
	1229	uint32_t flags = vseg->flags;
	1230
	1231	assert( ( type != VSEG_TYPE_FILE ) , __FUNCTION__ , "illegal vseg type\n" );
	1232
	1233	if( flags & VSEG_DISTRIB ) // distributed => cxy depends on vpn LSB
	1234	{
	1235	uint32_t x_size = LOCAL_CLUSTER->x_size;
	1236	uint32_t y_size = LOCAL_CLUSTER->y_size;
	1237	uint32_t y_width = LOCAL_CLUSTER->y_width;
	1238	uint32_t index = vpn & ((x_size * y_size) - 1);
	1239	uint32_t x = index / y_size;
	1240	uint32_t y = index % y_size;
	1241	page_cxy = (x<<y_width) + y;
	1242	}
	1243	else // other cases => cxy specified in vseg
	1244	{
	1245	page_cxy = vseg->cxy;
	1246	}
	1247
	1248	// allocate a physical page from target cluster
	1249	if( page_cxy == local_cxy ) // target cluster is the local cluster
	1250	{
	1251	req.type = KMEM_PAGE;
	1252	req.size = 0;
	1253	req.flags = AF_NONE;
	1254	page_ptr = (page_t *)kmem_alloc( &req );
	1255	}
	1256	else // target cluster is not the local cluster
	1257	{
	1258	rpc_pmem_get_pages_client( page_cxy , 0 , &page_ptr );
	1259	}
	1260
	1261	if( page_ptr == NULL ) return XPTR_NULL;
	1262	else return XPTR( page_cxy , page_ptr );
	1263
	1264	} // end vmm_page_allocate()
	1265
[313]	1266	////////////////////////////////////////
	1267	error_t vmm_get_one_ppn( vseg_t * vseg,
	1268	vpn_t vpn,
	1269	ppn_t * ppn )
	1270	{
	1271	error_t error;
[407]	1272	xptr_t page_xp; // extended pointer on physical page descriptor
[313]	1273	page_t * page_ptr; // local pointer on physical page descriptor
[406]	1274	uint32_t index; // missing page index in vseg mapper
	1275	uint32_t type; // vseg type;
[313]	1276
[406]	1277	type = vseg->type;
	1278	index = vpn - vseg->vpn_base;
[313]	1279
[407]	1280	vmm_dmsg("\n[DBG] %s : core[%x,%d] enter for vpn = %x / type = %s / index = %d\n",
	1281	__FUNCTION__, local_cxy, CURRENT_THREAD->core->lid, vpn, vseg_type_str(type), index );
[313]	1282
[406]	1283	// FILE type : get the physical page from the file mapper
[313]	1284	if( type == VSEG_TYPE_FILE )
	1285	{
[406]	1286	// get extended pointer on mapper
[407]	1287	xptr_t mapper_xp = vseg->mapper_xp;
[313]	1288
[406]	1289	assert( (mapper_xp != XPTR_NULL), __FUNCTION__,
	1290	"mapper not defined for a FILE vseg\n" );
	1291
	1292	// get mapper cluster and local pointer
	1293	cxy_t mapper_cxy = GET_CXY( mapper_xp );
	1294	mapper_t * mapper_ptr = (mapper_t *)GET_PTR( mapper_xp );
	1295
[313]	1296	// get page descriptor from mapper
	1297	if( mapper_cxy == local_cxy ) // mapper is local
	1298	{
	1299	page_ptr = mapper_get_page( mapper_ptr , index );
	1300	}
	1301	else // mapper is remote
	1302	{
	1303	rpc_mapper_get_page_client( mapper_cxy , mapper_ptr , index , &page_ptr );
	1304	}
	1305
	1306	if ( page_ptr == NULL ) return EINVAL;
	1307
[407]	1308	page_xp = XPTR( mapper_cxy , page_ptr );
[313]	1309	}
	1310
[406]	1311	// Other types : allocate a physical page from target cluster,
[407]	1312	// as defined by vseg type and vpn value
[313]	1313	else
	1314	{
[407]	1315	// allocate physical page
	1316	page_xp = vmm_page_allocate( vseg , vpn );
[406]	1317
[407]	1318	if( page_xp == XPTR_NULL ) return ENOMEM;
[313]	1319
[406]	1320	// initialise missing page from .elf file mapper for DATA and CODE types
	1321	// => the mapper_xp field is an extended pointer on the .elf file mapper
[313]	1322	if( (type == VSEG_TYPE_CODE) \|\| (type == VSEG_TYPE_DATA) )
	1323	{
[406]	1324	// get extended pointer on mapper
	1325	xptr_t mapper_xp = vseg->mapper_xp;
[313]	1326
[406]	1327	assert( (mapper_xp != XPTR_NULL), __FUNCTION__,
	1328	"mapper not defined for a CODE or DATA vseg\n" );
	1329
	1330	// get mapper cluster and local pointer
	1331	cxy_t mapper_cxy = GET_CXY( mapper_xp );
	1332	mapper_t * mapper_ptr = (mapper_t *)GET_PTR( mapper_xp );
	1333
	1334	// compute missing page offset in vseg
	1335	uint32_t offset = index << CONFIG_PPM_PAGE_SHIFT;
	1336
[313]	1337	// compute missing page offset in .elf file
[406]	1338	uint32_t elf_offset = vseg->file_offset + offset;
[313]	1339
[407]	1340	vmm_dmsg("\n[DBG] %s : core[%x,%d] for vpn = %x / elf_offset = %x\n",
	1341	__FUNCTION__, local_cxy, CURRENT_THREAD->core->lid, vpn, elf_offset );
[313]	1342
[406]	1343	// compute extended pointer on page base
[407]	1344	xptr_t base_xp = ppm_page2base( page_xp );
[313]	1345
[406]	1346	// file_size (in .elf mapper) can be smaller than vseg_size (BSS)
	1347	uint32_t file_size = vseg->file_size;
	1348
	1349	if( file_size < offset ) // missing page fully in BSS
[313]	1350	{
[407]	1351	vmm_dmsg("\n[DBG] %s : core[%x,%d] for vpn = %x / fully in BSS\n",
	1352	__FUNCTION__, local_cxy, CURRENT_THREAD->core->lid, vpn );
[406]	1353
[407]	1354	if( GET_CXY( page_xp ) == local_cxy )
[313]	1355	{
[315]	1356	memset( GET_PTR( base_xp ) , 0 , CONFIG_PPM_PAGE_SIZE );
[313]	1357	}
	1358	else
	1359	{
[315]	1360	hal_remote_memset( base_xp , 0 , CONFIG_PPM_PAGE_SIZE );
[313]	1361	}
	1362	}
[406]	1363	else if( file_size >= (offset + CONFIG_PPM_PAGE_SIZE) ) // fully in mapper
[315]	1364	{
[406]	1365
[407]	1366	vmm_dmsg("\n[DBG] %s : core[%x,%d] for vpn = %x / fully in mapper\n",
	1367	__FUNCTION__, local_cxy, CURRENT_THREAD->core->lid, vpn );
	1368
[313]	1369	if( mapper_cxy == local_cxy )
	1370	{
	1371	error = mapper_move_kernel( mapper_ptr,
	1372	true, // to_buffer
[406]	1373	elf_offset,
[313]	1374	base_xp,
[315]	1375	CONFIG_PPM_PAGE_SIZE );
[313]	1376	}
	1377	else
	1378	{
	1379	rpc_mapper_move_buffer_client( mapper_cxy,
	1380	mapper_ptr,
	1381	true, // to buffer
	1382	false, // kernel buffer
[406]	1383	elf_offset,
	1384	base_xp,
[315]	1385	CONFIG_PPM_PAGE_SIZE,
[313]	1386	&error );
	1387	}
	1388	if( error ) return EINVAL;
	1389	}
[406]	1390	else // both in mapper and in BSS :
	1391	// - (file_size - offset) bytes from mapper
	1392	// - (page_size + offset - file_size) bytes from BSS
[313]	1393	{
[406]	1394
[407]	1395	vmm_dmsg("\n[DBG] %s : core[%x,%d] for vpn = %x / both mapper & BSS\n"
	1396	" %d bytes from mapper / %d bytes from BSS\n",
	1397	__FUNCTION__, local_cxy, CURRENT_THREAD->core->lid, vpn,
	1398	file_size - offset , offset + CONFIG_PPM_PAGE_SIZE - file_size );
	1399
[313]	1400	// initialize mapper part
[315]	1401	if( mapper_cxy == local_cxy )
[313]	1402	{
	1403	error = mapper_move_kernel( mapper_ptr,
[315]	1404	true, // to buffer
[406]	1405	elf_offset,
[313]	1406	base_xp,
[406]	1407	file_size - offset );
[313]	1408	}
[315]	1409	else
[313]	1410	{
	1411	rpc_mapper_move_buffer_client( mapper_cxy,
	1412	mapper_ptr,
[315]	1413	true, // to buffer
[313]	1414	false, // kernel buffer
[406]	1415	elf_offset,
	1416	base_xp,
	1417	file_size - offset,
[313]	1418	&error );
	1419	}
	1420	if( error ) return EINVAL;
	1421
	1422	// initialize BSS part
[407]	1423	if( GET_CXY( page_xp ) == local_cxy )
[313]	1424	{
[406]	1425	memset( GET_PTR( base_xp ) + file_size - offset , 0 ,
	1426	offset + CONFIG_PPM_PAGE_SIZE - file_size );
[313]	1427	}
	1428	else
	1429	{
[406]	1430	hal_remote_memset( base_xp + file_size - offset , 0 ,
	1431	offset + CONFIG_PPM_PAGE_SIZE - file_size );
[313]	1432	}
	1433	}
	1434	} // end initialisation for CODE or DATA types
	1435	}
	1436
	1437	// return ppn
[407]	1438	*ppn = ppm_page2ppn( page_xp );
[406]	1439
[407]	1440	vmm_dmsg("\n[DBG] %s : core[%x,%d] exit for vpn = %x / ppn = %x\n",
	1441	__FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , vpn , *ppn );
[406]	1442
[313]	1443	return 0;
	1444
	1445	} // end vmm_get_one_ppn()
	1446
[1]	1447	/////////////////////////////////////////
	1448	error_t vmm_get_pte( process_t * process,
	1449	vpn_t vpn,
[407]	1450	bool_t cow,
	1451	uint32_t * attr,
	1452	ppn_t * ppn )
[1]	1453	{
[407]	1454	vseg_t * vseg; // pointer on vseg containing VPN
	1455	ppn_t old_ppn; // current PTE_PPN
	1456	uint32_t old_attr; // current PTE_ATTR
	1457	ppn_t new_ppn; // new PTE_PPN
	1458	uint32_t new_attr; // new PTE_ATTR
[1]	1459	error_t error;
	1460
[178]	1461	// this function must be called by a thread running in the reference cluster
[68]	1462	assert( (GET_CXY( process->ref_xp ) == local_cxy ) , __FUNCTION__ ,
[406]	1463	"not called in the reference cluster\n" );
[1]	1464
[407]	1465	vmm_dmsg("\n[DBG] %s : core[%x,%d] enter for vpn = %x in process %x / cow = %d\n",
[408]	1466	__FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , vpn , process->pid , cow );
[406]	1467
[1]	1468	// get VMM pointer
	1469	vmm_t * vmm = &process->vmm;
	1470
[407]	1471	// get vseg pointer from ref VSL
	1472	error = vmm_get_vseg( process , vpn<<CONFIG_PPM_PAGE_SHIFT , &vseg );
[1]	1473
[407]	1474	if( error )
[1]	1475	{
[407]	1476	printk("\n[ERROR] in %s : out of segment / process = %x / vpn = %x\n",
	1477	__FUNCTION__ , process->pid , vpn );
	1478	return error;
	1479	}
[406]	1480
[407]	1481	vmm_dmsg("\n[DBG] %s : core[%x,%d] found vseg %s / vpn_base = %x / vpn_size = %x\n",
	1482	__FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid ,
	1483	vseg_type_str(vseg->type) , vseg->vpn_base , vseg->vpn_size );
[1]	1484
[407]	1485	// access GPT to get current PTE attributes and PPN
	1486	hal_gpt_get_pte( &vmm->gpt , vpn , &old_attr , &old_ppn );
	1487
[408]	1488	// for both "copy_on_write" and "page_fault" events, allocate a physical page,
	1489	// initialize it, register it in the reference GPT, update GPT copies in all
	1490	// clusters containing a copy, and return the new_ppn and new_attr
[407]	1491
	1492	if( cow ) ////////////// copy_on_write request ///////////
	1493	{
[408]	1494	assert( (old_attr & GPT_MAPPED) , __FUNCTION__ ,
	1495	"PTE must be mapped for a copy-on-write exception\n" );
[407]	1496
[408]	1497	excp_dmsg("\n[DBG] %s : core[%x,%d] handling COW for vpn %x\n",
[407]	1498	__FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , vpn );
	1499
[408]	1500	// get extended pointer, cluster and local pointer on page descriptor
	1501	xptr_t page_xp = ppm_ppn2page( old_ppn );
	1502	cxy_t page_cxy = GET_CXY( page_xp );
	1503	page_t * page_ptr = (page_t *)GET_PTR( page_xp );
[407]	1504
[408]	1505	// get number of pending forks in page descriptor
	1506	uint32_t count = hal_remote_lw( XPTR( page_cxy , &page_ptr->fork_nr ) );
	1507
	1508	if( count ) // pending fork => allocate a new page, copy it, reset COW
[1]	1509	{
[408]	1510	// allocate a new physical page
	1511	page_xp = vmm_page_allocate( vseg , vpn );
	1512	if( page_xp == XPTR_NULL )
	1513	{
	1514	printk("\n[ERROR] in %s : no memory / process = %x / vpn = %x\n",
	1515	__FUNCTION__ , process->pid , vpn );
	1516	return -1;
	1517	}
[1]	1518
[408]	1519	// compute allocated page PPN
	1520	new_ppn = ppm_page2ppn( page_xp );
[406]	1521
[408]	1522	// copy old page content to new page
	1523	xptr_t old_base_xp = ppm_ppn2base( old_ppn );
	1524	xptr_t new_base_xp = ppm_ppn2base( new_ppn );
	1525	memcpy( GET_PTR( new_base_xp ),
	1526	GET_PTR( old_base_xp ),
	1527	CONFIG_PPM_PAGE_SIZE );
	1528	}
	1529	else // no pending fork => keep the existing page, reset COW
	1530	{
	1531	new_ppn = old_ppn;
	1532	}
[1]	1533
[408]	1534	// build new_attr : reset COW and set WRITABLE,
	1535	new_attr = (old_attr \| GPT_WRITABLE) & (~GPT_COW);
[407]	1536
[408]	1537	// update GPT[vpn] for all GPT copies
	1538	// to maintain coherence of copies
	1539	vmm_update_pte( process,
	1540	vpn,
	1541	new_attr,
	1542	new_ppn );
[407]	1543
[408]	1544	// decrement fork_nr in page descriptor
	1545	hal_remote_atomic_add( XPTR( page_cxy , &page_ptr->fork_nr ) , -1 );
[407]	1546	}
[408]	1547	else /////////////// page_fault request ///////////
[407]	1548	{
[408]	1549	if( (old_attr & GPT_MAPPED) == 0 ) // true page_fault => map it
[407]	1550	{
[1]	1551
[408]	1552	excp_dmsg("\n[DBG] %s : core[%x,%d] handling page fault for vpn %x\n",
[407]	1553	__FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , vpn );
[1]	1554
[408]	1555	// allocate new_ppn, depending on vseg type
[407]	1556	error = vmm_get_one_ppn( vseg , vpn , &new_ppn );
	1557	if( error )
	1558	{
	1559	printk("\n[ERROR] in %s : no memory / process = %x / vpn = %x\n",
	1560	__FUNCTION__ , process->pid , vpn );
[408]	1561	return -1;
[407]	1562	}
	1563
[408]	1564	// define new_attr from vseg flags
[407]	1565	new_attr = GPT_MAPPED \| GPT_SMALL;
	1566	if( vseg->flags & VSEG_USER ) new_attr \|= GPT_USER;
	1567	if( vseg->flags & VSEG_WRITE ) new_attr \|= GPT_WRITABLE;
	1568	if( vseg->flags & VSEG_EXEC ) new_attr \|= GPT_EXECUTABLE;
	1569	if( vseg->flags & VSEG_CACHE ) new_attr \|= GPT_CACHABLE;
	1570
[408]	1571	// register new PTE in reference GPT
	1572	// on demand policy => no update of GPT copies
	1573	error = hal_gpt_set_pte( &vmm->gpt,
	1574	vpn,
	1575	new_attr,
	1576	new_ppn );
[407]	1577	if( error )
	1578	{
	1579	printk("\n[ERROR] in %s : cannot update GPT / process = %x / vpn = %x\n",
	1580	__FUNCTION__ , process->pid , vpn );
[408]	1581	return -1;
[407]	1582	}
	1583	}
[408]	1584	else // mapped in reference GPT => get it
[1]	1585	{
[408]	1586	new_ppn = old_ppn;
[407]	1587	new_attr = old_attr;
[1]	1588	}
[407]	1589	}
[1]	1590
[408]	1591	excp_dmsg("\n[DBG] %s : core[%x,%d] update GPT for vpn %x / ppn = %x / attr = %x\n",
[407]	1592	__FUNCTION__ , local_cxy , CURRENT_THREAD->core->lid , vpn , new_ppn , new_attr );
[406]	1593
[408]	1594	// retur success
[407]	1595	*ppn = new_ppn;
	1596	*attr = new_attr;
[1]	1597	return 0;
	1598
[313]	1599	} // end vmm_get_pte()
	1600
[1]	1601	///////////////////////////////////////////////////
	1602	error_t vmm_handle_page_fault( process_t * process,
	1603	vpn_t vpn )
	1604	{
	1605	uint32_t attr; // missing page attributes
[21]	1606	ppn_t ppn; // missing page PPN
[407]	1607	error_t error;
[1]	1608
	1609	// get reference process cluster and local pointer
	1610	cxy_t ref_cxy = GET_CXY( process->ref_xp );
	1611	process_t * ref_ptr = (process_t *)GET_PTR( process->ref_xp );
	1612
[313]	1613	// get missing PTE attributes and PPN from reference cluster
[407]	1614	if( local_cxy != ref_cxy )
[1]	1615	{
[407]	1616	rpc_vmm_get_pte_client( ref_cxy,
	1617	ref_ptr,
	1618	vpn,
	1619	false, // page_fault
	1620	&attr,
	1621	&ppn,
	1622	&error );
	1623
	1624	// get local VMM pointer
	1625	vmm_t * vmm = &process->vmm;
	1626
	1627	// update local GPT
[408]	1628	error \|= hal_gpt_set_pte( &vmm->gpt,
	1629	vpn,
	1630	attr,
	1631	ppn );
[1]	1632	}
[407]	1633	else // local cluster is the reference cluster
[1]	1634	{
[407]	1635	error = vmm_get_pte( process,
	1636	vpn,
	1637	false, // page-fault
	1638	&attr,
	1639	&ppn );
[1]	1640	}
	1641
[388]	1642	return error;
[1]	1643
[313]	1644	} // end vmm_handle_page_fault()
	1645
[408]	1646	////////////////////////////////////////////
	1647	error_t vmm_handle_cow( process_t * process,
	1648	vpn_t vpn )
[407]	1649	{
	1650	uint32_t attr; // missing page attributes
	1651	ppn_t ppn; // missing page PPN
	1652	error_t error;
[313]	1653
[407]	1654	// get reference process cluster and local pointer
	1655	cxy_t ref_cxy = GET_CXY( process->ref_xp );
	1656	process_t * ref_ptr = (process_t *)GET_PTR( process->ref_xp );
	1657
	1658	// get new PTE attributes and PPN from reference cluster
	1659	if( local_cxy != ref_cxy )
	1660	{
	1661	rpc_vmm_get_pte_client( ref_cxy,
	1662	ref_ptr,
	1663	vpn,
	1664	true, // copy-on-write
	1665	&attr,
	1666	&ppn,
	1667	&error );
	1668
	1669	// get local VMM pointer
	1670	vmm_t * vmm = &process->vmm;
	1671
	1672	// update local GPT
[408]	1673	error \|= hal_gpt_set_pte( &vmm->gpt,
	1674	vpn,
	1675	attr,
	1676	ppn );
[407]	1677	}
	1678	else // local cluster is the reference cluster
	1679	{
	1680	error = vmm_get_pte( process,
	1681	vpn,
	1682	true, // copy-on-write
	1683	&attr,
	1684	&ppn );
	1685	}
	1686
	1687	return error;
	1688
[408]	1689	} // end vmm_handle_cow()
[407]	1690
[1]	1691	///////////////////////////////////////////
	1692	error_t vmm_v2p_translate( bool_t ident,
	1693	void * ptr,
	1694	paddr_t * paddr )
	1695	{
[23]	1696	process_t * process = CURRENT_THREAD->process;
[1]	1697
	1698	if( ident ) // identity mapping
	1699	{
[23]	1700	*paddr = (paddr_t)PADDR( local_cxy , (lpa_t)ptr );
[1]	1701	return 0;
	1702	}
	1703
[21]	1704	// access page table
[1]	1705	error_t error;
	1706	vpn_t vpn;
	1707	uint32_t attr;
	1708	ppn_t ppn;
	1709	uint32_t offset;
	1710
[23]	1711	vpn = (vpn_t)( (intptr_t)ptr >> CONFIG_PPM_PAGE_SHIFT );
	1712	offset = (uint32_t)( ((intptr_t)ptr) & CONFIG_PPM_PAGE_MASK );
[1]	1713
[50]	1714	if( local_cxy == GET_CXY( process->ref_xp) ) // calling process is reference process
[1]	1715	{
[407]	1716	error = vmm_get_pte( process, vpn , false , &attr , &ppn );
[1]	1717	}
[50]	1718	else // calling process is not reference process
[1]	1719	{
	1720	cxy_t ref_cxy = GET_CXY( process->ref_xp );
	1721	process_t * ref_ptr = (process_t *)GET_PTR( process->ref_xp );
[407]	1722	rpc_vmm_get_pte_client( ref_cxy , ref_ptr , vpn , false , &attr , &ppn , &error );
[1]	1723	}
	1724
[23]	1725	// set paddr
[1]	1726	*paddr = (((paddr_t)ppn) << CONFIG_PPM_PAGE_SHIFT) \| offset;
[21]	1727
[23]	1728	return error;
[313]	1729
[315]	1730	} // end vmm_v2p_translate()
[1]	1731
[315]	1732

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