source: trunk/kernel/kern/rpc.h @ 624

Last change on this file since 624 was 624, checked in by alain, 5 years ago

Fix several bugs to use the instruction MMU in kernel mode
in replacement of the instruction address extension register,
and remove the "kentry" segment.

This version is running on the tsar_generic_iob" platform.

One interesting bug: the cp0_ebase defining the kernel entry point
(for interrupts, exceptions and syscalls) must be initialized
early in kernel_init(), because the VFS initialisation done by
kernel_ini() uses RPCs, and RPCs uses Inter-Processor-Interrup.
File size: 36.2 KB
Line 
1/*
2 * rpc.h - RPC (Remote Procedure Call) operations definition.
3 *
4 * Author  Alain Greiner (2016,2017,2018)
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
27#include <kernel_config.h>
28#include <hal_kernel_types.h>
29#include <hal_atomic.h>
30#include <bits.h>
31#include <vseg.h>
32#include <remote_fifo.h>
33
34/**** Forward declarations ****/
35
36struct process_s;
37struct page_s;
38struct vseg_s;
39struct exec_info_s;
40struct pthread_attr_s;
41struct remote_sem_s;
42struct user_dir_s;
43struct fragment_s;
44struct vfs_inode_s;
45struct vfs_dentry_s;
46struct vfs_file_s;
47struct thread_s;
48struct mapper_s;
49
50
51/**********************************************************************************/
52/**************  structures for Remote Procedure Calls ****************************/
53/**********************************************************************************/
54
55/***********************************************************************************
56 * This enum defines all RPC indexes.
57 * It must be consistent with the rpc_server[] arrays defined in in the rpc.c file.
58 **********************************************************************************/
59
60typedef enum
61{
62    RPC_PMEM_GET_PAGES            = 0,
63    RPC_PMEM_RELEASE_PAGES        = 1,
64    RPC_UNDEFINED_2               = 2,     
65    RPC_PROCESS_MAKE_FORK         = 3,
66    RPC_USER_DIR_CREATE           = 4,
67    RPC_USER_DIR_DESTROY          = 5,
68    RPC_THREAD_USER_CREATE        = 6,
69    RPC_THREAD_KERNEL_CREATE      = 7,
70    RPC_VFS_FS_UPDATE_DENTRY      = 8,
71    RPC_PROCESS_SIGACTION         = 9,
72
73    RPC_VFS_INODE_CREATE          = 10,
74    RPC_VFS_INODE_DESTROY         = 11,
75    RPC_VFS_DENTRY_CREATE         = 12,
76    RPC_VFS_DENTRY_DESTROY        = 13,
77    RPC_VFS_FILE_CREATE           = 14,
78    RPC_VFS_FILE_DESTROY          = 15,
79    RPC_VFS_FS_GET_DENTRY         = 16,
80    RPC_VFS_FS_ADD_DENTRY         = 17,
81    RPC_VFS_FS_REMOVE_DENTRY      = 18,
82    RPC_VFS_INODE_LOAD_ALL_PAGES  = 19,
83
84    RPC_VMM_GET_VSEG              = 20,
85    RPC_VMM_GLOBAL_UPDATE_PTE     = 21,
86    RPC_KCM_ALLOC                 = 22,
87    RPC_KCM_FREE                  = 23,
88    RPC_MAPPER_SYNC               = 24,
89    RPC_MAPPER_HANDLE_MISS        = 25,
90    RPC_VMM_DELETE_VSEG           = 26,
91    RPC_VMM_CREATE_VSEG           = 27,
92    RPC_VMM_SET_COW               = 28,
93    RPC_VMM_DISPLAY               = 29,
94
95    RPC_MAX_INDEX                 = 30,
96}
97rpc_index_t;
98
99/***********************************************************************************
100 * This defines the prototype of the rpc_server functions,
101 * defined by the rpc_server[] array in the rpc.c file.
102 **********************************************************************************/
103
104typedef  void (rpc_server_t) ( xptr_t xp );
105
106/***********************************************************************************
107 *  This structure defines the RPC descriptor (100 bytes on a 32bits core)
108 **********************************************************************************/
109
110typedef struct rpc_desc_s
111{
112        rpc_index_t         index;       /*! index of requested RPC service      ( 4) */
113        uint32_t          * rsp;         /*! local pointer ond responses counter ( 4) */
114    struct thread_s   * thread;      /*! local pointer on client thread      ( 4) */
115    uint32_t            lid;         /*! index of core running client thread ( 4) */ 
116    bool_t              blocking;    /*! simple RPC mode when true           ( 4) */
117    uint64_t            args[10];    /*! input/output arguments buffer       (80) */
118} 
119rpc_desc_t;
120
121/**********************************************************************************/
122/******* Generic functions supporting RPCs : client side **************************/
123/**********************************************************************************/
124
125/***********************************************************************************
126 * This function is executed by the client thread in the client cluster.
127 * It puts one RPC descriptor defined by the <desc> argument in the remote fifo
128 * defined by the <cxy> argument.  It sends an IPI to the server if fifo is empty.
129 * The RPC descriptor must be allocated in the caller's stack, and initialised by
130 * the caller. It exit with a Panic message if remote fifo is still full after
131 * (CONFIG_RPC_PUT_MAX_ITERATIONS) retries.
132 * - When the RPC <blocking> field is true, this function blocks and deschedule.
133 *   It returns only when the server acknowledges the RPC by writing in the RPC
134 *   "response" field, and unblocks the client.
135 * - When the <blocking> field is false, this function returns as soon as the RPC
136 *   has been registered in the FIFO, and the server thread must directly signal
137 *   completion to the client thread.
138 ***********************************************************************************
139 * @ cxy   : server cluster identifier
140 * @ desc  : local pointer on RPC descriptor in client cluster
141 **********************************************************************************/
142void rpc_send( cxy_t        cxy,   
143               rpc_desc_t * desc );
144
145
146
147/**********************************************************************************/
148/******* Generic functions supporting RPCs : server side **************************/
149/**********************************************************************************/
150
151/***********************************************************************************
152 * This function contains the infinite loop executed by a RPC server thread,
153 * to handle pending RPCs registered in the RPC fifo attached to a given core.
154 * In each iteration in this loop, it try to handle one RPC request:
155 * - it tries to take the RPC FIFO ownership,
156 * - it consumes one request when the FIFO is not empty,
157 * - it releases the FIFO ownership,
158 * - it execute the requested service,
159 * - it unblock and send an IPI to the client thread,
160 * - it suicides if the number of RPC threads for this core is to large,
161 * - it block on IDLE and deschedule otherwise. 
162 **********************************************************************************/
163void rpc_server_func( void );
164
165/***********************************************************************************
166 * This function is executed in case of illegal RPC index.
167 **********************************************************************************/
168void __attribute__((noinline)) rpc_undefined( xptr_t xp __attribute__ ((unused)) );
169
170
171
172/**********************************************************************************/
173/******* Marshalling functions attached to the various RPCs ***********************/
174/**********************************************************************************/
175
176/***********************************************************************************
177 * [0] The RPC_PMEM_GET_PAGES allocates one or several pages in a remote cluster,
178 * and returns the local pointer on the page descriptor.
179 ***********************************************************************************
180 * @ cxy     : server cluster identifier
181 * @ order   : [in]  ln2( number of requested pages )
182 * @ page    : [out] local pointer on page descriptor / NULL if failure
183 **********************************************************************************/
184void rpc_pmem_get_pages_client( cxy_t             cxy,
185                                uint32_t          order,
186                                struct page_s  ** page );
187
188void rpc_pmem_get_pages_server( xptr_t xp );
189
190/***********************************************************************************
191 * [1] The RPC_PMEM_RELEASE_PAGES release one or several pages to a remote cluster.
192 ***********************************************************************************
193 * @ cxy     : server cluster identifier
194 * @ page    : [in] local pointer on page descriptor to release.
195 **********************************************************************************/
196void rpc_pmem_release_pages_client( cxy_t            cxy,
197                                    struct page_s  * page );
198
199void rpc_pmem_release_pages_server( xptr_t xp );
200
201/***********************************************************************************
202 * [2] undefined slot
203 **********************************************************************************/
204
205/***********************************************************************************
206 * [3] The RPC_PROCESS_MAKE_FORK creates a "child" process descriptor, and the
207 * associated "child" thread descriptor in a target remote cluster that can be
208 * any cluster.  The child process is initialized from informations found in the
209 * "parent" process descriptor (that must be the parent reference cluster),
210 * and from the "parent" thread descriptor that can be in any cluster.
211 ***********************************************************************************
212 * @ cxy              : server cluster identifier.
213 * @ ref_process_xp   : [in]  extended pointer on reference parent process.
214 * @ parent_thread_xp : [in]  extended pointer on parent thread.
215 * @ child_pid        : [out] child process identifier.
216 * @ child_thread_ptr : [out] local pointer on child thread.
217 * @ error            : [out]  error status (0 if success).
218 **********************************************************************************/
219void rpc_process_make_fork_client( cxy_t              cxy,
220                                   xptr_t             ref_process_xp,
221                                   xptr_t             parent_thread_xp,
222                                   pid_t            * child_pid,
223                                   struct thread_s ** child_thread_ptr,
224                                   error_t          * error );
225
226void rpc_process_make_fork_server( xptr_t xp );
227
228/***********************************************************************************
229 * [4] The RPC_USER_DIR_CREATE allows a client thread to create an user_dir_t
230 * structure and the associated array of dirents in a remote cluster containing
231 * the target directory <inode>. It creates an ANON vseg in the user reference
232 * process VMM identified by the <ref_xp>. This reference cluster cluster can be
233 * different from both the client and server clusters.
234 * It is called by the sys_opendir() function.
235 ***********************************************************************************
236 * @ cxy        : server cluster identifier.
237 * @ inode      : [in]   local pointer on inode in server cluster.
238 * @ ref_xp     : [in]   extended pointer on user reference process descriptor.
239 * @ dir        : [out]  local pointer on created user_dir structure.
240 **********************************************************************************/
241void rpc_user_dir_create_client( cxy_t                 cxy,
242                                 struct vfs_inode_s  * inode,
243                                 xptr_t                ref_xp,
244                                 struct user_dir_s  ** dir );
245
246void rpc_user_dir_create_server( xptr_t xp );
247
248/***********************************************************************************
249 * [5] The RPC_USER_DIR_DESTROY allows a client thread to delete an user_dir_t
250 * structure and the associated array of dirents in a remote cluster containing
251 * the target directory inode. It is called by the sys_closedir() function.
252 ***********************************************************************************
253 * @ cxy        : server cluster identifier.
254 * @ dir        : [in]  local pointer on created user_dir structure.
255 * @ ref_xp     : [in]   extended pointer on user reference process descriptor.
256 **********************************************************************************/
257void rpc_user_dir_destroy_client( cxy_t               cxy,
258                                  struct user_dir_s * dir,
259                                  xptr_t              ref_xp );
260
261void rpc_user_dir_destroy_server( xptr_t xp );
262
263/***********************************************************************************
264 * [6] The RPC_THREAD_USER_CREATE creates an user thread in the server cluster,
265 * as specified by the arguments. It returns an extended pointer on the new
266 * thread descriptor in server cluster, and an error code.
267 * It is called by the sys_thread_create() system call.
268 ***********************************************************************************
269 * @ cxy       : server cluster identifier.
270 * @ attr      : [in]  local pointer on pthread_attr_t in client cluster.
271 * @ thread_xp : [out] buffer for thread extended pointer.
272 * @ error     : [out] error status (0 if success).
273 **********************************************************************************/
274void rpc_thread_user_create_client( cxy_t                   cxy,
275                                    pid_t                   pid,
276                                    void                  * start_func,
277                                    void                  * start_arg,
278                                    pthread_attr_t        * attr,
279                                    xptr_t                * thread_xp,
280                                    error_t               * error );
281
282void rpc_thread_user_create_server( xptr_t xp );
283
284/***********************************************************************************
285 * [7] The RPC_THREAD_KERNEL_CREATE creates a kernel thread in the server cluster,
286 * as specified by the type, func and args arguments. It returns the local pointer
287 * on the thread descriptor in server cluster and an error code.
288 * It is used by the dev_init() function to create the device server thread.
289 ***********************************************************************************
290 * @ cxy       : server cluster identifier.
291 * @ type      : [in]  type of kernel thread.
292 * @ func      : [in]  local pointer on thread function.
293 * @ args      : [in]  local pointer on function arguments.
294 * @ thread_xp : [out] pointer on buffer for thread extended pointer.
295 * @ error     : [out] error status (0 if success).
296 **********************************************************************************/
297void rpc_thread_kernel_create_client( cxy_t     cxy,
298                                      uint32_t  type,
299                                      void    * func,
300                                      void    * args,
301                                      xptr_t  * thread_xp,
302                                      error_t * error );
303
304void rpc_thread_kernel_create_server( xptr_t xp );
305
306/***********************************************************************************
307 * [8] The RPC_VFS_FS_UPDATE_DENTRY allows a client thread to request a remote
308 * cluster to update the <size> field of a directory entry in the mapper of a
309 * remote directory inode, identified by the <inode> local pointer.
310 * The target entry name is identified by the <dentry> local pointer.
311 ***********************************************************************************
312 * @ cxy     : server cluster identifier.
313 * @ inode   : [in] local pointer on remote directory inode.
314 * @ dentry  : [in] local pointer on remote dentry.
315 * @ size    : [in] new size value.
316 * @ error   : [out] error status (0 if success).
317 **********************************************************************************/
318void rpc_vfs_fs_update_dentry_client( cxy_t                 cxy,
319                                      struct vfs_inode_s  * inode,
320                                      struct vfs_dentry_s * dentry,
321                                      uint32_t              size,
322                                      error_t             * error );
323
324void rpc_vfs_fs_update_dentry_server( xptr_t xp );
325
326/***********************************************************************************
327 * [9] The RPC_PROCESS_SIGACTION allows a client thread to request a remote cluster
328 * to execute a given sigaction, defined by the <action_type> for a given process,
329 * identified by the <pid> argument.
330 ***********************************************************************************
331 * @ cxy     : server cluster identifier.
332 * @ pid     : [in] target process identifier.
333 * @ action  : [in] sigaction index.
334 **********************************************************************************/
335void rpc_process_sigaction_client( cxy_t     cxy,
336                                   pid_t     pid,
337                                   uint32_t  action );
338                             
339void rpc_process_sigaction_server( xptr_t xp );
340
341/***********************************************************************************
342 * [10] The RPC_VFS_INODE_CREATE creates an inode and the associated mapper in a
343 * remote cluster. The parent dentry must have been previously created.
344 * It returns an extended pointer on the created inode.
345 ***********************************************************************************
346 * @ cxy        :  server cluster identifier.
347 * @ fs_type    : [in]  file system type.
348 * @ inode_type : [in]  file system type.
349 * @ attr       : [in]  inode attributes.
350 * @ rights     : [in]  access rights
351 * @ uid        : [in]  user ID
352 * @ gid        : [in]  group ID
353 * @ inode_xp   : [out] buffer for extended pointer on created inode.
354 * @ error      : [out] error status (0 if success).
355 **********************************************************************************/
356void rpc_vfs_inode_create_client( cxy_t      cxy,
357                                  uint32_t   fs_type,
358                                  uint32_t   attr,   
359                                  uint32_t   rights, 
360                                  uint32_t   uid,
361                                  uint32_t   gid,
362                                  xptr_t   * inode_xp,
363                                  error_t  * error );
364
365void rpc_vfs_inode_create_server( xptr_t xp );
366
367/***********************************************************************************
368 * [11] The RPC_VFS_INODE_DESTROY releases memory allocated for an inode descriptor
369 * and for the associated mapper in a remote cluster.
370 ***********************************************************************************
371 * @ cxy       :  server cluster identifier
372 * @ inode     : [in]  local pointer on inode.
373 **********************************************************************************/
374void rpc_vfs_inode_destroy_client( cxy_t                cxy,
375                                   struct vfs_inode_s * inode );
376
377void rpc_vfs_inode_destroy_server( xptr_t xp );
378
379/***********************************************************************************
380 * [12] The RPC_VFS_DENTRY_CREATE creates a dentry in a remote cluster.
381 * It returns an extended pointer on the created dentry.
382 ***********************************************************************************
383 * @ cxy        :  server cluster identifier
384 * @ type       : [in]  file system type.
385 * @ name       : [in]  directory entry name.
386 * @ dentry_xp  : [out] buffer for extended pointer on created dentry.
387 * @ error      : [out] error status (0 if success).
388 **********************************************************************************/
389void rpc_vfs_dentry_create_client( cxy_t                  cxy,
390                                   uint32_t               type,
391                                   char                 * name,   
392                                   xptr_t               * dentry_xp,
393                                   error_t              * error );
394
395void rpc_vfs_dentry_create_server( xptr_t xp );
396
397/***********************************************************************************
398 * [13] The RPC_VFS_DENTRY_DESTROY remove a denfry from the parent inode XHTAB,
399 * and releases memory allocated for the dentry descriptor in a remote cluster.
400 ***********************************************************************************
401 * @ cxy       :  server cluster identifier
402 * @ dentry     : [in]  local pointer on dentry.
403 **********************************************************************************/
404void rpc_vfs_dentry_destroy_client( cxy_t                 cxy,
405                                    struct vfs_dentry_s * dentry );
406
407void rpc_vfs_dentry_destroy_server( xptr_t xp );
408
409/***********************************************************************************
410 * [14] The RPC_VFS_FILE_CREATE creates a file descriptor in a remote cluster.
411 * It returns an extended pointer on the created file structure.
412 ***********************************************************************************
413 * @ cxy        :  server cluster identifier
414 * @ inode      : [in]  local pointer on parent inode.
415 * @ file_attr  : [in]  new file attributes.
416 * @ file_xp    : [out] buffer for extended pointer on created file.
417 * @ error      : [out] error status (0 if success).
418 **********************************************************************************/
419void rpc_vfs_file_create_client( cxy_t                  cxy,
420                                 struct vfs_inode_s   * inode,
421                                 uint32_t               file_attr,
422                                 xptr_t               * file_xp,
423                                 error_t              * error );
424
425void rpc_vfs_file_create_server( xptr_t xp );
426
427/***********************************************************************************
428 * [15] The RPC_VFS_FILE_DESTROY releases memory allocated for a file descriptor
429 * in a remote cluster.
430 ***********************************************************************************
431 * @ cxy       :  server cluster identifier
432 * @ file       : [in]  local pointer on file.
433 **********************************************************************************/
434void rpc_vfs_file_destroy_client( cxy_t               cxy,
435                                  struct vfs_file_s * file );
436
437void rpc_vfs_file_destroy_server( xptr_t xp );
438
439/***********************************************************************************
440 * [16] The RPC_VFS_FS_GET_DENTRY calls the vfs_fs_new_dentry()
441 * function in a remote cluster containing a parent inode directory to scan the
442 * associated mapper, find a directory entry identified by its name, and update
443 * both the - existing - child inode and dentry.
444 ***********************************************************************************
445 * @ cxy            : server cluster identifier
446 * @ parent_inode   : [in]  local pointer on parent inode.
447 * @ name           : [in]  local pointer on child name (in client cluster).
448 * @ child_inode_xp : [in]  extended pointer on child inode (in another cluster).
449 * @ error          : [out] error status (0 if success).
450 **********************************************************************************/
451void rpc_vfs_fs_new_dentry_client( cxy_t                cxy,
452                                   struct vfs_inode_s * parent_inode,
453                                   char               * name,
454                                   xptr_t               child_inode_xp,
455                                   error_t            * error );
456
457void rpc_vfs_fs_new_dentry_server( xptr_t xp );
458
459/***********************************************************************************
460 * [17] The RPC_VFS_FS_ADD_DENTRY calls the vfs_fs_add_dentry() function in a
461 * remote cluster containing a directory inode and mapper, to add a new dentry
462 * in the mapper of this directory.
463 ***********************************************************************************
464 * @ cxy            : server cluster identifier
465 * @ parent         : [in]  local pointer on directory inode.
466 * @ dentry         : [in]  local pointer on dentry.
467 * @ error          : [out] error status (0 if success).
468 **********************************************************************************/
469void rpc_vfs_fs_add_dentry_client( cxy_t,
470                                   struct vfs_inode_s  * parent,
471                                   struct vfs_dentry_s * dentry,
472                                   error_t             * error );
473
474void rpc_vfs_fs_add_dentry_server( xptr_t xp );
475
476/***********************************************************************************
477 * [18] The RPC_VFS_FS_REMOVE_DENTRY calls the vfs_fs_remove_dentry() function in a
478 * remote cluster containing a directory inode and mapper, to remove a dentry from
479 * the mapper of this directory.
480 ***********************************************************************************
481 * @ cxy            : server cluster identifier
482 * @ parent         : [in]  local pointer on directory inode.
483 * @ dentry         : [in]  local pointer on dentry.
484 * @ error          : [out] error status (0 if success).
485 **********************************************************************************/
486void rpc_vfs_fs_remove_dentry_client( cxy_t,
487                                      struct vfs_inode_s  * parent,
488                                      struct vfs_dentry_s * dentry,
489                                      error_t             * error );
490
491void rpc_vfs_fs_remove_dentry_server( xptr_t xp );
492
493/***********************************************************************************
494 * [19] The RPC_VFS_INODE_LOAD_ALL_PAGES calls the vfs_inode_load_all_pages()
495 * function a remote cluster containing an inode to load all pages in the
496 * associated mapper. 
497 ***********************************************************************************
498 * @ cxy     : server cluster identifier
499 * @ inode   : [in]  local pointer on inode in server cluster.
500 * @ error   : [out] error status (0 if success).
501 **********************************************************************************/
502void rpc_vfs_inode_load_all_pages_client( cxy_t                cxy,
503                                          struct vfs_inode_s * inode,
504                                          error_t            * error );
505
506void rpc_vfs_inode_load_all_pages_server( xptr_t xp );
507
508/***********************************************************************************
509 * [20] The RPC_VMM_GET_VSEG returns an extended pointer
510 * on the vseg containing a given virtual address in a given process.
511 * The server cluster is supposed to be the reference cluster.
512 * It returns a non zero error value if no vseg has been founded.
513 ***********************************************************************************
514 * @ cxy     : server cluster identifier.
515 * @ process : [in]   pointer on process descriptor in server cluster.
516 * @ vaddr   : [in]   virtual address to be searched.
517 * @ vseg_xp : [out]  buffer for extended pointer on vseg in client cluster.
518 * @ error   : [out] local pointer on buffer for error code (in client cluster).
519 **********************************************************************************/
520void rpc_vmm_get_vseg_client( cxy_t              cxy,
521                              struct process_s * process,
522                              intptr_t           vaddr,
523                              xptr_t           * vseg_xp,
524                              error_t          * error );
525
526void rpc_vmm_get_vseg_server( xptr_t xp );
527
528/***********************************************************************************
529 * [21] The RPC_VMM_GLOBAL_UPDATE_PTE can be used by a thread that is not running
530 * in reference cluster, to ask the reference cluster to update a specific entry,
531 * identified by the <vpn> argument in all GPT copies of a process identified by
532 * the <process> argument, using the values defined by <attr> and <ppn> arguments.
533 * The server cluster is supposed to be the reference cluster.
534 * It does not return any error code as the called function vmm_global_update_pte()
535 * cannot fail.
536 ***********************************************************************************
537 * @ cxy     : server cluster identifier.
538 * @ process : [in]  pointer on process descriptor in server cluster.
539 * @ vpn     : [in]  virtual address to be searched.
540 * @ attr    : [in]  PTE attributes.
541 * @ ppn     : [it]  PTE PPN.
542 **********************************************************************************/
543void rpc_vmm_global_update_pte_client( cxy_t              cxy,
544                                       struct process_s * process,
545                                       vpn_t              vpn,
546                                       uint32_t           attr,
547                                       ppn_t              ppn );
548
549void rpc_vmm_global_update_pte_server( xptr_t xp );
550
551/***********************************************************************************
552 * [22] The RPC_KCM_ALLOC allocates memory from a given KCM in a remote cluster,
553 * and returns an extended pointer on the allocated object.
554  It returns XPTR_NULL if physical memory cannot be allocated.
555 ***********************************************************************************
556 * @ cxy       : server cluster identifier.
557 * @ kmem_type : [in]  KCM object type (as defined in kmem.h).
558 * @ buf_xp    : [out] buffer for extended pointer on allocated buffer.
559 **********************************************************************************/
560void rpc_kcm_alloc_client( cxy_t      cxy,
561                           uint32_t   kmem_type,
562                           xptr_t   * buf_xp ); 
563
564void rpc_kcm_alloc_server( xptr_t xp );
565
566/***********************************************************************************
567 * [23] The RPC_KCM_FREE releases memory allocated for a KCM object of a given type,
568 * in a remote cluster.
569 ***********************************************************************************
570 * @ cxy       : server cluster identifier.
571 * @ buf       : [in] local pointer on allocated buffer.
572 * @ kmem_type : [in]  KCM object type (as defined in kmem.h).
573 **********************************************************************************/
574void rpc_kcm_free_client( cxy_t     cxy,
575                          void    * buf,
576                          uint32_t  kmem_type );
577
578void rpc_kcm_free_server( xptr_t xp );
579
580/***********************************************************************************
581 * [24] The RPC_MAPPER_SYNC allows a client thread to synchronize on disk
582 * all dirty pages of a remote mapper.
583 ***********************************************************************************
584 * @ cxy       : server cluster identifier.
585 * @ mapper    : [in] local pointer on mapper in server cluster.
586 * @ error       : [out] error status (0 if success).
587 **********************************************************************************/
588void rpc_mapper_sync_client( cxy_t             cxy,
589                             struct mapper_s * mapper,
590                             error_t         * error );
591
592void rpc_mapper_sync_server( xptr_t xp );
593
594/***********************************************************************************
595 * [25] The RPC__MAPPER_HANDLE_MISS allows a client thread to request a remote
596 * mapper to load a missing page from the IOC device.
597 * On the server side, this RPC call the mapper_handle_miss() function and return
598 * an extended pointer on the allocated page descriptor and an error status.
599 ***********************************************************************************
600 * @ cxy         : server cluster identifier.
601 * @ mapper      : [in]  local pointer on mapper.
602 * @ page_id     : [in]  missing page index in mapper
603 * @ buffer      : [in]  user space pointer / kernel extended pointer
604 * @ page_xp     : [out] pointer on buffer for extended pointer on page descriptor.
605 * @ error       : [out] error status (0 if success).
606 **********************************************************************************/
607void rpc_mapper_handle_miss_client( cxy_t             cxy,
608                                    struct mapper_s * mapper,
609                                    uint32_t          page_id,
610                                    xptr_t          * page_xp,
611                                    error_t         * error );
612 
613void rpc_mapper_handle_miss_server( xptr_t xp );
614
615/***********************************************************************************
616 * [26] The RPC_VMM_DELETE_VSEG allows any client thread  to request a remote
617 * cluster to delete from a given VMM, identified by the <pid> argument
618 * a given vseg, identified by the <vaddr> argument.
619 ***********************************************************************************
620 * @ cxy         : server cluster identifier.
621 * @ pid         : [in] target process identifier.
622 * @ vaddr       : [in] vseg base address.
623 **********************************************************************************/
624void rpc_vmm_delete_vseg_client( cxy_t       cxy,
625                                 pid_t       pid,
626                                 intptr_t    vaddr );
627 
628void rpc_vmm_delete_vseg_server( xptr_t xp );
629
630/***********************************************************************************
631 * [27] The RPC_VMM_CREATE_VSEG allows a client thread to request the remote
632 * reference cluster of a given process to allocate and register in the reference
633 * process VMM a new vseg descriptor.
634 * On the server side, this RPC uses the vmm_create_vseg() function, and returns
635 * to the client the local pointer on the created vseg descriptor.
636 ***********************************************************************************
637 * @ cxy         : server cluster identifier.
638 * @ process     : [in]  local pointer on process descriptor in server.
639 * @ type        : [in]  vseg type.
640 * @ base        : [in]  base address (unused for dynamically allocated vsegs).
641 * @ size        : [in]  number of bytes.
642 * @ file_offset : [in]  offset in file (for CODE, DATA, FILE types).
643 * @ file_size   : [in]  can be smaller than size for DATA type.
644 * @ mapper_xp   : [in]  extended pointer on mapper (for CODE, DATA, FILE types).
645 * @ vseg_cxy    : [in]  target cluster for mapping (if not data type).
646 * @ vseg        : [out] local pointer on vseg descriptor / NULL if failure.
647 **********************************************************************************/
648void rpc_vmm_create_vseg_client( cxy_t              cxy,
649                                 struct process_s * process,
650                                 vseg_type_t        type,
651                                 intptr_t           base,
652                                 uint32_t           size,
653                                 uint32_t           file_offset,
654                                 uint32_t           file_size,
655                                 xptr_t             mapper_xp,
656                                 cxy_t              vseg_cxy,
657                                 struct vseg_s   ** vseg );
658
659void rpc_vmm_create_vseg_server( xptr_t xp );
660
661/***********************************************************************************
662 * [28] The RPC_VMM_SET_COW allows a client thread to request the remote reference
663 * cluster to set the COW flag and reset the WRITABLE flag of all GPT entries for
664 * the DATA, MMAP and REMOTE vsegs of process identified by the <process> argument.
665
666 * of a remote scheduler, identified by the <lid> argument.
667 ***********************************************************************************
668 * @ cxy         : server cluster identifier.
669 * @ process     : [in]  local pointer on reference process descriptor.
670 **********************************************************************************/
671void rpc_vmm_set_cow_client( cxy_t              cxy,
672                             struct process_s * process );
673
674void rpc_vmm_set_cow_server( xptr_t xp );
675
676/***********************************************************************************
677 * [29] The RPC_VMM_DISPLAY allows any client thread to display the VMM state
678 * of a remote reference process identified by the <cxy> and <process> arguments.
679 * The type of display is defined by the <detailed> boolean argument.
680 ***********************************************************************************
681 * @ cxy         : server cluster identifier.
682 * @ process     : [in]  local pointer on reference process descriptor.
683 * @ detailed    : [in]  detailed display if true.
684 **********************************************************************************/
685void rpc_hal_vmm_display_client( cxy_t              cxy,
686                             struct process_s * process,
687                             bool_t             detailed );
688
689void rpc_hal_vmm_display_server( xptr_t xp );
690
691
692#endif
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