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source: trunk/kernel/kern/rpc.h @ 336

Last change on this file since 336 was 313, checked in by alain, 7 years ago
RSeveral modifs in the page-fault handling.
File size: 30.6 KB

Rev	Line
[1]	1	/*
	2	* rpc.h - RPC (Remote Procedure Call) operations definition.
	3	*
[23]	4	* Author Alain Greiner (2016,2017)
[1]	5	*
	6	* Copyright (c) UPMC Sorbonne Universites
	7	*
	8	* This file is part of ALMOS-MKH.
	9	*
	10	* ALMOS-MKH is free software; you can redistribute it and/or modify it
	11	* under the terms of the GNU General Public License as published by
	12	* the Free Software Foundation; version 2.0 of the License.
	13	*
	14	* ALMOS-MKH is distributed in the hope that it will be useful, but
	15	* WITHOUT ANY WARRANTY; without even the implied warranty of
	16	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	17	* General Public License for more details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with ALMOS-MKH; if not, write to the Free Software Foundation,
	21	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
	22	*/
	23
	24	#ifndef _RPC_H_
	25	#define _RPC_H_
	26
[14]	27	#include <kernel_config.h>
[1]	28	#include <hal_types.h>
	29	#include <hal_atomic.h>
	30	#include <bits.h>
	31	#include <spinlock.h>
	32	#include <remote_fifo.h>
	33
	34	/** Forward declarations **/
	35
	36	struct process_s;
[313]	37	struct page_s;
[1]	38	struct vseg_s;
	39	struct exec_info_s;
	40	struct pthread_attr_s;
	41	struct remote_sem_s;
	42	struct fragment_s;
	43	struct vfs_inode_s;
	44	struct vfs_dentry_s;
[23]	45	struct vfs_file_s;
[1]	46	struct thread_s;
	47	struct mapper_s;
	48
	49	/**********************************************************************************/
	50	/************ structures for Remote Procedure Calls **************************/
	51	/**********************************************************************************/
	52
	53	/***********************************************************************************
	54	* This enum defines all RPC indexes.
	55	* It must be consistent with the rpc_server[] array defined in in the rpc.c file.
	56	**********************************************************************************/
	57
	58	typedef enum
	59	{
	60	RPC_PMEM_GET_PAGES = 0,
	61	RPC_PROCESS_PID_ALLOC = 1,
	62	RPC_PROCESS_EXEC = 2,
	63	RPC_PROCESS_KILL = 3,
	64	RPC_THREAD_USER_CREATE = 4,
	65	RPC_THREAD_KERNEL_CREATE = 5,
[23]	66	RPC_SIGNAL_RISE = 6,
[1]	67
	68	RPC_VFS_INODE_CREATE = 10,
	69	RPC_VFS_INODE_DESTROY = 11,
	70	RPC_VFS_DENTRY_CREATE = 12,
	71	RPC_VFS_DENTRY_DESTROY = 13,
[23]	72	RPC_VFS_FILE_CREATE = 14,
	73	RPC_VFS_FILE_DESTROY = 15,
[238]	74	RPC_VFS_INODE_LOAD = 16,
	75	RPC_VFS_MAPPER_LOAD_ALL = 17,
	76	RPC_FATFS_GET_CLUSTER = 18,
[1]	77
	78	RPC_VMM_GET_REF_VSEG = 20,
	79	RPC_VMM_GET_PTE = 21,
[23]	80	RPC_KCM_ALLOC = 22,
	81	RPC_KCM_FREE = 23,
[265]	82	RPC_MAPPER_MOVE_BUFFER = 24,
[313]	83	RPC_MAPPER_GET_PAGE = 25,
[1]	84
[23]	85	RPC_MAX_INDEX = 30,
[1]	86	}
	87	rpc_index_t;
	88
	89	/***********************************************************************************
	90	* This defines the prototype of the rpc_server functions,
	91	* defined by the rpc_server[] array in the rpc.c file.
	92	**********************************************************************************/
	93
	94	typedef void (rpc_server_t) ( xptr_t xp );
	95
	96	/***********************************************************************************
	97	* This structure defines the RPC descriptor
	98	**********************************************************************************/
	99
	100	typedef struct rpc_desc_s
	101	{
	102	rpc_index_t index; // index of requested RPC service
	103	volatile uint32_t response; // response valid when 0
[23]	104	uint64_t args[10]; // input/output arguments buffer
[1]	105	}
	106	rpc_desc_t;
	107
	108	/***********************************************************************************
	109	* This structure defines the RPC fifo, containing a remote_fifo, the owner RPC
	110	* thread TRDID (used as a light lock), and the intrumentation counter.
	111	*
	112	* Implementation note: the TRDID is a good owner identifier, because all
	113	* RPC threads in a given cluster belong to the same process_zero kernel process,
	114	* and RPC threads cannot have local index LTID = 0.
	115	**********************************************************************************/
	116
	117	typedef struct rpc_fifo_s
	118	{
	119	trdid_t owner; // owner thread / 0 if no owner
	120	uint64_t count; // total number of received RPCs (instrumentation)
	121	remote_fifo_t fifo; // embedded remote fifo
	122	}
	123	rpc_fifo_t;
	124
	125
	126	/**********************************************************************************/
	127	/***** Generic functions supporting RPCs : client side ************************/
	128	/**********************************************************************************/
	129
	130	/***********************************************************************************
	131	* This blocking function executes on the client core.
	132	* It puts one RPC extended pointer in the remote fifo.
	133	* It sends an IPI if fifo is empty, and waits until RPC response available.
	134	* The RPC descriptor must be allocated in the caller's stack
	135	* and initialised by the caller. Exit with a Panic message if remote fifo
	136	* is still full after (CONFIG_RPC_PUT_MAX_ITERATIONS) retries.
	137	***********************************************************************************
	138	* @ cxy : server cluster identifier
	139	* @ desc : local pointer on RPC descriptor in client cluster
	140	**********************************************************************************/
	141	void rpc_send_sync( cxy_t cxy,
	142	rpc_desc_t * desc );
	143
	144
	145
	146	/**********************************************************************************/
	147	/***** Generic functions supporting RPCs : server side ************************/
	148	/**********************************************************************************/
	149
	150	/***********************************************************************************
	151	* This function initialises the local RPC fifo and the lock protecting readers.
	152	* The number of slots is defined by the CONFIG_REMOTE_FIFO_SLOTS parameter.
	153	* Each slot contains an extended pointer on the RPC descriptor.
	154	***********************************************************************************
	155	* @ rf : pointer on the local RPC fifo.
	156	**********************************************************************************/
	157	void rpc_fifo_init( rpc_fifo_t * rf );
	158
	159	/***********************************************************************************
	160	* This function is the entry point for RPC handling on the server side.
[296]	161	* It is executed by a core receiving an IPI.
[279]	162	* It checks the RPC fifo, try to take the light-lock and activates (or creates)
	163	* an RPC thread in case of success.
[1]	164	***********************************************************************************
[279]	165	* @ returns true if success / false otherwise.
[1]	166	**********************************************************************************/
	167	bool_t rpc_check();
	168
	169	/***********************************************************************************
	170	* This function contains the loop to execute all pending RPCs on the server side.
	171	* It should be called with irq disabled and after light lock acquisition.
	172	***********************************************************************************
	173	* @ rpc_fifo : pointer on the local RPC fifo
	174	**********************************************************************************/
[279]	175	void rpc_execute_all( rpc_fifo_t * rpc_fifo );
[1]	176
	177	/**********************************************************************************
	178	* This function is called by any thread running on any core in any cluster,
	179	* that detected a non-empty RPC_FIFO and got the RPC_FIFO ownership.
	180	* It activates one RPC thread, and immediately switches to the RPC thread.
	181	* It gets the first free RPC thread from the core free-list, or creates a new one
	182	* when the core free-list is empty.
	183	***********************************************************************************
	184	* @ rpc_fifo : pointer on the non-empty RPC fifo.
	185	* @ return 0 if success / return ENOMEM if error.
	186	**********************************************************************************/
	187	error_t rpc_activate_thread( rpc_fifo_t * rpc_fifo );
	188
	189	/***********************************************************************************
	190	* This function contains the infinite loop executed by each RPC thread.
	191	**********************************************************************************/
	192	void rpc_thread_func();
	193
	194	/***********************************************************************************
	195	* This function is executed in case of illegal RPC index.
	196	**********************************************************************************/
	197	void __attribute__((noinline)) rpc_undefined();
	198
[23]	199
	200
	201
[1]	202	/**********************************************************************************/
	203	/***** Marshalling functions attached to the various RPCs *********************/
	204	/**********************************************************************************/
	205
	206	/***********************************************************************************
[23]	207	* [0] The RPC_PMEM_GET_PAGES allocates one or several pages in a remote cluster,
[313]	208	* and returns the local pointer on the page descriptor.
[1]	209	***********************************************************************************
	210	* @ cxy : server cluster identifier
	211	* @ order : [in] ln2( number of requested pages )
[313]	212	* @ page : [out] local pointer on page descriptor / NULL if failure
[1]	213	**********************************************************************************/
[313]	214	void rpc_pmem_get_pages_client( cxy_t cxy,
	215	uint32_t order,
	216	struct page_s ** page );
[1]	217
	218	void rpc_pmem_get_pages_server( xptr_t xp );
	219
	220	/***********************************************************************************
[23]	221	* [1] The RPC_PROCESS_PID_ALLOC allocates one new PID in a remote cluster, registers
[1]	222	* the new process in the remote cluster, and returns the PID, and an error code.
	223	***********************************************************************************
	224	* @ cxy : server cluster identifier.
	225	* @ process : [in] local pointer on process descriptor in client cluster.
	226	* @ error : [out] error status (0 if success).
	227	* @ pid : [out] new process identifier.
	228	**********************************************************************************/
	229	void rpc_process_pid_alloc_client( cxy_t cxy,
	230	struct process_s * process,
	231	error_t * error,
	232	pid_t * pid );
	233
	234	void rpc_process_pid_alloc_server( xptr_t xp );
	235
	236	/***********************************************************************************
[23]	237	* [2] The RPC_PROCESS_EXEC creates a process descriptor copy, in a remote cluster
[1]	238	* and initializes if from information found in the reference process descriptor.
	239	* This remote cluster becomes the new reference cluster.
	240	***********************************************************************************
	241	* @ cxy : server cluster identifier.
	242	* @ info : [in] pointer on local exec_info structure.
	243	* @ error : [out] error status (0 if success).
	244	**********************************************************************************/
	245	void rpc_process_exec_client( cxy_t cxy,
	246	struct exec_info_s * info,
	247	error_t * error );
	248
	249	void rpc_process_exec_server( xptr_t xp );
	250
	251	/***********************************************************************************
[23]	252	* [3] The RPC_PROCESS_KILL is actually a multicast RPC sent by the reference cluster
[1]	253	* to other clusters containing a process descriptor copy, to destroy these copies.
	254	***********************************************************************************
	255	* @ process : local pointer on target process.
	256	**********************************************************************************/
	257	void rpc_process_kill_client( struct process_s * process );
	258
	259	void rpc_process_kill_server( xptr_t xp );
	260
	261	/***********************************************************************************
[23]	262	* [4] The RPC_THREAD_USER_CREATE creates an user thread in the server cluster,
	263	* as specified by the arguments. It returns an extended pointer on the new
	264	* thread descriptor in server cluster, and an error code.
	265	* It is called by the sys_thread_create() system call.
[1]	266	***********************************************************************************
	267	* @ cxy : server cluster identifier.
	268	* @ attr : [in] pointer on pthread_attr_t in client cluster.
	269	* @ thread_xp : [out] pointer on buffer for thread extended pointer.
	270	* @ error : [out] error status (0 if success).
	271	**********************************************************************************/
	272	void rpc_thread_user_create_client( cxy_t cxy,
[23]	273	pid_t pid,
	274	void * start_func,
	275	void * start_arg,
[1]	276	struct pthread_attr_s * attr,
	277	xptr_t * thread_xp,
	278	error_t * error );
	279
	280	void rpc_thread_user_create_server( xptr_t xp );
	281
	282	/***********************************************************************************
[23]	283	* [5] The RPC_THREAD_KERNEL_CREATE creates a kernel thread in the server cluster,
[1]	284	* as specified by the type, func and args arguments. It returns the local pointer
	285	* on the thread descriptor in server cluster and an error code.
[23]	286	* It is used by the dev_init() function to create the device server thread.
[1]	287	***********************************************************************************
	288	* @ cxy : server cluster identifier.
	289	* @ type : [in] type of kernel thread.
	290	* @ func : [in] local pointer on thread function.
	291	* @ args : [in] local pointer on function arguments.
	292	* @ thread_xp : [out] pointer on buffer for thread extended pointer.
	293	* @ error : [out] error status (0 if success).
	294	**********************************************************************************/
	295	void rpc_thread_kernel_create_client( cxy_t cxy,
	296	uint32_t type,
	297	void * func,
	298	void * args,
	299	xptr_t * thread_xp,
	300	error_t * error );
	301
	302	void rpc_thread_kernel_create_server( xptr_t xp );
	303
[23]	304	/***********************************************************************************
	305	* [6] The RPC_SIGNAL_RISE ask a target cluster to register a given signal in
	306	* all threads descriptors of a given process.
	307	* It is used by the sys_kill() function.
	308	***********************************************************************************
	309	* @ cxy : server cluster identifier.
	310	* @ process : [in] local pointer on target process descriptor in server.
	311	* @ sig_id : [in] signal index.
	312	**********************************************************************************/
	313	void rpc_signal_rise_client( cxy_t cxy,
	314	struct process_s * process,
	315	uint32_t sig_id );
	316
	317	void rpc_signal_rise_server( xptr_t xp );
	318
[1]	319	/***********************************************************************************
[23]	320	* [10] The RPC_VFS_INODE_CREATE creates an inode and the associated mapper in a
[1]	321	* remote cluster. The parent dentry must have been previously created.
	322	* It returns an extended pointer on the created inode.
	323	***********************************************************************************
[23]	324	* @ cxy : server cluster identifier.
	325	* @ dentry_xp : [in] extended pointer on parent dentry.
	326	* @ fs_type : [in] file system type.
	327	* @ inode_type : [in] file system type.
[188]	328	* @ extend : [in] fs_type_specific inode extension.
[23]	329	* @ attr : [in] inode attributes.
	330	* @ rights : [in] access rights
	331	* @ uid : [in] user ID
	332	* @ gid : [in] group ID
	333	* @ inode_xp : [out] buffer for extended pointer on created inode.
	334	* @ error : [out] error status (0 if success).
[1]	335	**********************************************************************************/
	336	void rpc_vfs_inode_create_client( cxy_t cxy,
	337	xptr_t dentry_xp,
[23]	338	uint32_t fs_type,
	339	uint32_t inode_type,
[188]	340	void * extend,
[1]	341	uint32_t attr,
[23]	342	uint32_t rights,
[1]	343	uint32_t uid,
	344	uint32_t gid,
	345	xptr_t * inode_xp,
	346	error_t * error );
	347
	348	void rpc_vfs_inode_create_server( xptr_t xp );
	349
	350	/***********************************************************************************
[23]	351	* [11] The RPC_VFS_INODE_DESTROY releases memory allocated for an inode descriptor
[1]	352	* and for the associated mapper in a remote cluster.
	353	***********************************************************************************
	354	* @ cxy : server cluster identifier
	355	* @ inode : [in] local pointer on inode.
	356	**********************************************************************************/
	357	void rpc_vfs_inode_destroy_client( cxy_t cxy,
	358	struct vfs_inode_s * inode );
	359
	360	void rpc_vfs_inode_destroy_server( xptr_t xp );
	361
	362	/***********************************************************************************
[23]	363	* [12] The RPC_VFS_DENTRY_CREATE creates a dentry in a remote cluster.
[1]	364	* It returns an extended pointer on the created dentry.
	365	***********************************************************************************
	366	* @ cxy : server cluster identifier
	367	* @ type : [in] file system type.
	368	* @ name : [in] directory entry name.
	369	* @ parent : [in] local pointer on parent inode.
	370	* @ dentry_xp : [out] buffer for extended pointer on created dentry.
	371	* @ error : [out] error status (0 if success).
	372	**********************************************************************************/
	373	void rpc_vfs_dentry_create_client( cxy_t cxy,
	374	uint32_t type,
	375	char * name,
	376	struct vfs_inode_s * parent,
	377	xptr_t * dentry_xp,
	378	error_t * error );
	379
	380	void rpc_vfs_dentry_create_server( xptr_t xp );
	381
	382	/***********************************************************************************
[23]	383	* [13] The RPC_VFS_DENTRY_DESTROY releases memory allocated for an dentry descriptor
[1]	384	* in a remote cluster.
	385	***********************************************************************************
	386	* @ cxy : server cluster identifier
	387	* @ dentry : [in] local pointer on dentry.
	388	**********************************************************************************/
	389	void rpc_vfs_dentry_destroy_client( cxy_t cxy,
	390	struct vfs_dentry_s * dentry );
	391
	392	void rpc_vfs_dentry_destroy_server( xptr_t xp );
	393
[23]	394	/***********************************************************************************
	395	* [14] The RPC_VFS_FILE_CREATE creates a file descriptor in a remote cluster.
	396	* It returns an extended pointer on the created file structure.
	397	***********************************************************************************
	398	* @ cxy : server cluster identifier
	399	* @ inode : [in] local pointer on parent inode.
	400	* @ file_attr : [in] new file attributes.
	401	* @ file_xp : [out] buffer for extended pointer on created file.
	402	* @ error : [out] error status (0 if success).
	403	**********************************************************************************/
	404	void rpc_vfs_file_create_client( cxy_t cxy,
	405	struct vfs_inode_s * inode,
	406	uint32_t file_attr,
	407	xptr_t * file_xp,
	408	error_t * error );
[1]	409
[23]	410	void rpc_vfs_file_create_server( xptr_t xp );
[1]	411
[23]	412	/***********************************************************************************
	413	* [15] The RPC_VFS_FILE_DESTROY releases memory allocated for a file descriptor
	414	* in a remote cluster.
	415	***********************************************************************************
	416	* @ cxy : server cluster identifier
	417	* @ file : [in] local pointer on file.
	418	**********************************************************************************/
	419	void rpc_vfs_file_destroy_client( cxy_t cxy,
	420	struct vfs_file_s * file );
[1]	421
[23]	422	void rpc_vfs_file_destroy_server( xptr_t xp );
	423
[238]	424	/***********************************************************************************
	425	* [16] The RPC_VFS_LOAD_INODE calls the vfs_inode_load() kernel function in a
	426	* remote cluster containing a parent inode directory to scan the associated
	427	* mapper, find a directory entry, identified by its name, and update the remote
	428	* child inode.
	429	***********************************************************************************
	430	* @ cxy : server cluster identifier
	431	* @ parent_inode : [in] local pointer on parent inode.
	432	* @ name : [in] local pointer on child name (in client cluster).
	433	* @ child_inode_xp : [in] extended pointer on child inode (in another cluster).
	434	* @ error : [out] error status (0 if success).
	435	**********************************************************************************/
	436	void rpc_vfs_inode_load_client( cxy_t cxy,
	437	struct vfs_inode_s * parent_inode,
	438	char * name,
	439	xptr_t child_inode_xp,
	440	error_t * error );
	441
	442	void rpc_vfs_inode_load_server( xptr_t xp );
	443
	444	/***********************************************************************************
	445	* [17] The RPC_VFS_MAPPER_LOAD_ALL calls the vfs_mapper_load_all() kernel function
	446	* in a remote cluster containing an inode, to load all pages of the associated
	447	* mapper from the file system on device.
	448	***********************************************************************************
	449	* @ cxy : server cluster identifier
	450	* @ inode : [in] local pointer on inode in server cluster.
	451	* @ error : [out] error status (0 if success).
	452	**********************************************************************************/
	453	void rpc_vfs_mapper_load_all_client( cxy_t cxy,
	454	struct vfs_inode_s * inode,
	455	error_t * error );
	456
	457	void rpc_vfs_mapper_load_all_server( xptr_t xp );
	458
[1]	459	/***********************************************************************************
[238]	460	* [18] The RPC_FATFS_GET_CLUSTER can be send by any thread running in a "client"
[23]	461	* cluster to scan the FAT mapper, stored in a remote "server" cluster, and get
	462	* from the mapper the local pointer on a given page.
	463	***********************************************************************************
	464	* @ cxy : server cluster identifier.
	465	* @ mapper : [in] local pointer on FAT mapper.
	466	* @ first : [in] FATFS cluster index allocated to first page of file.
	467	* @ page : [in] page index in file.
	468	* @ cluster : [out] local pointer on buffer for found FATFS cluster index.
	469	* @ error : [out] local pointer on buffer for error code (in client cluster).
	470	**********************************************************************************/
	471	void rpc_fatfs_get_cluster_client( cxy_t cxy,
	472	struct mapper_s * mapper,
	473	uint32_t first,
	474	uint32_t page,
	475	uint32_t * cluster,
	476	error_t * error );
	477
	478	void rpc_fatfs_get_cluster_server( xptr_t xp );
	479
	480	/***********************************************************************************
	481	* [20] The RPC_VMM_GET_REF_VSEG returns an extended pointer
[1]	482	* on the vseg containing a given virtual address in a given process.
	483	* The server cluster is supposed to be the reference cluster.
[16]	484	* It returns XPTR_NULL if no vseg has been founded.
[1]	485	***********************************************************************************
	486	* @ cxy : server cluster identifier.
	487	* @ process : [in] pointer on process descriptor in server cluster.
	488	* @ vaddr : [in] virtual address to be searched.
[16]	489	* @ vseg_xp : [out] buffer for extended pointer on vseg in client cluster.
[1]	490	**********************************************************************************/
	491	void rpc_vmm_get_ref_vseg_client( cxy_t cxy,
	492	struct process_s * process,
	493	intptr_t vaddr,
	494	xptr_t * vseg_xp );
	495
	496	void rpc_vmm_get_ref_vseg_server( xptr_t xp );
	497
	498	/***********************************************************************************
[23]	499	* [21] The RPC_VMM_GET_PTE returns in the "ppn" and "attr" arguments the PTE value
[1]	500	* for a given VPN in a given process.
	501	* The server cluster is supposed to be the reference cluster, and the vseg
	502	* containing the VPN must be registered in the reference VMM.
	503	* It returns an error if physical memory cannot be allocated for the PTE2,
	504	* or for the missing page itself.
	505	***********************************************************************************
	506	* @ cxy : server cluster identifier.
	507	* @ process : [in] pointer on process descriptor in server cluster.
	508	* @ vaddr : [in] virtual address to be searched.
	509	* @ attr : [out] address of buffer for attributes.
	510	* @ ppn : [out] address of buffer for PPN.
	511	* @ error : [out] address of buffer for error code.
	512	**********************************************************************************/
	513	void rpc_vmm_get_pte_client( cxy_t cxy,
	514	struct process_s * process,
	515	vpn_t vpn,
	516	uint32_t * attr,
	517	ppn_t * ppn,
	518	error_t * error );
	519
	520	void rpc_vmm_get_pte_server( xptr_t xp );
	521
	522	/***********************************************************************************
[23]	523	* [22] The RPC_KCM_ALLOC allocates memory from a given KCM in a remote cluster,
	524	* and returns an extended pointer on the allocated object.
	525	It returns XPTR_NULL if physical memory cannot be allocated.
[1]	526	***********************************************************************************
[23]	527	* @ cxy : server cluster identifier.
	528	* @ kmem_type : [in] KCM object type (as defined in kmem.h).
	529	* @ buf_xp : [out] buffer for extended pointer on allocated buffer.
[1]	530	**********************************************************************************/
[23]	531	void rpc_kcm_alloc_client( cxy_t cxy,
	532	uint32_t kmem_type,
	533	xptr_t * buf_xp );
[1]	534
[23]	535	void rpc_kcm_alloc_server( xptr_t xp );
[1]	536
	537	/***********************************************************************************
[23]	538	* [23] The RPC_KCM_FREE releases memory allocated for a KCM object of a given type,
[1]	539	* in a remote cluster.
	540	***********************************************************************************
[23]	541	* @ cxy : server cluster identifier.
	542	* @ buf : [in] local pointer on allocated buffer.
	543	* @ kmem_type : [in] KCM object type (as defined in kmem.h).
[1]	544	**********************************************************************************/
[23]	545	void rpc_kcm_free_client( cxy_t cxy,
	546	void * buf,
	547	uint32_t kmem_type );
[1]	548
[23]	549	void rpc_kcm_free_server( xptr_t xp );
[1]	550
	551	/***********************************************************************************
[313]	552	* [24] The RPC_MAPPER_MOVE_BUFFER allows a client thread to require a remote
	553	* mapper to move data to/from a kernel or user buffer.
	554	* - It calls the mapper_move_user() function for a - possibly distributed -
	555	* user buffer identified by a user-space pointer, and casted to uint64_t.
	556	* - It calls the mapper_move_kernel() function for a - possibly remote -
	557	* kernel buffer identified by an extended pointer, and casted to uint64_t.
	558	* It is used by the vfs_move_user() function to move data between a mapper
	559	* and an user buffer required by a sys_read() or a sys_write().
	560	* It is used by the vmm_get_one_ppn() function to initialise a physical page
	561	* from a .elf file mapper, for a CODE or DATA vseg page fault.
[1]	562	***********************************************************************************
[23]	563	* @ cxy : server cluster identifier.
	564	* @ mapper : [in] local pointer on mapper
[313]	565	* @ to_buffer : [in] move data from mapper to buffer if non zero.
	566	* @ is_user : [in] buffer in user space if true
[23]	567	* @ file_offset : [in] first byte to move in mapper
[313]	568	* @ buffer : [in] user space pointer / kernel extended pointer
[23]	569	* @ size : [in] number of bytes to move
	570	* @ error : [out] error status (0 if success).
[1]	571	**********************************************************************************/
[265]	572	void rpc_mapper_move_buffer_client( cxy_t cxy,
	573	struct mapper_s * mapper,
	574	bool_t to_buffer,
	575	bool_t is_user,
	576	uint32_t file_offset,
[313]	577	uint64_t buffer,
[265]	578	uint32_t size,
	579	error_t * error );
[1]	580
[265]	581	void rpc_mapper_move_buffer_server( xptr_t xp );
[1]	582
[313]	583	/***********************************************************************************
	584	* [25] The RPC_MAPPER_GET_PAGE allows a client thread to get the local pointer
	585	* on a remote page descriptor, for a page, identified by the page index in mapper.
	586	* It is used by the vmm_get_one_ppn() function to handle a page fault on
	587	* a FILE type vseg.
	588	***********************************************************************************
	589	* @ cxy : server cluster identifier.
	590	* @ mapper : [in] local pointer on mapper.
	591	* @ index : [in] page index in mapper.
	592	* @ page : [out] local pointer on page descriptor / NULL if failure.
	593	**********************************************************************************/
	594	void rpc_mapper_get_page_client( cxy_t cxy,
	595	struct mapper_s * mapper,
	596	uint32_t index,
	597	struct page_s ** page );
[1]	598
[313]	599	void rpc_mapper_get_page_server( xptr_t xp );
[1]	600
	601	#endif

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