/*
 * rpc.c - RPC operations implementation.
 * 
 * Author    Alain Greiner (2016,2017,2018)
 *
 * Copyright (c)  UPMC Sorbonne Universites
 *
 * This file is part of ALMOS-MKH.
 *
 * ALMOS-MKH is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2.0 of the License.
 *
 * ALMOS-MKH is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <kernel_config.h>
#include <hal_kernel_types.h>
#include <hal_atomic.h>
#include <hal_remote.h>
#include <hal_irqmask.h>
#include <hal_special.h>
#include <printk.h>
#include <remote_sem.h>
#include <core.h>
#include <mapper.h>
#include <chdev.h>
#include <bits.h>
#include <thread.h>
#include <cluster.h>
#include <process.h>
#include <vfs.h>
#include <fatfs.h>
#include <rpc.h>


/////////////////////////////////////////////////////////////////////////////////////////
//      array of function pointers  (must be consistent with enum in rpc.h) 
/////////////////////////////////////////////////////////////////////////////////////////

rpc_server_t * rpc_server[RPC_MAX_INDEX] =
{
    &rpc_pmem_get_pages_server,         // 0
    &rpc_pmem_release_pages_server,     // 1
    &rpc_undefined,                     // 2    unused slot
    &rpc_process_make_fork_server,      // 3
    &rpc_undefined,                     // 4    unused slot
    &rpc_undefined,                     // 5    unused slot
    &rpc_thread_user_create_server,     // 6
    &rpc_thread_kernel_create_server,   // 7
    &rpc_undefined,                     // 8    unused slot        
    &rpc_process_sigaction_server,      // 9

    &rpc_vfs_inode_create_server,       // 10  
    &rpc_vfs_inode_destroy_server,      // 11  
    &rpc_vfs_dentry_create_server,      // 12  
    &rpc_vfs_dentry_destroy_server,     // 13  
    &rpc_vfs_file_create_server,        // 14
    &rpc_vfs_file_destroy_server,       // 15
    &rpc_vfs_inode_load_server,         // 16
    &rpc_vfs_mapper_load_all_server,    // 17
    &rpc_fatfs_get_cluster_server,      // 18
    &rpc_undefined,                     // 19   unused slot

    &rpc_vmm_get_vseg_server,           // 20
    &rpc_vmm_get_pte_server,            // 21
    &rpc_kcm_alloc_server,              // 22
    &rpc_kcm_free_server,               // 23
    &rpc_mapper_move_buffer_server,     // 24
    &rpc_mapper_get_page_server,        // 25
    &rpc_vmm_create_vseg_server,        // 26
    &rpc_undefined,                     // 27   unused slot
    &rpc_vmm_set_cow_server,            // 28
    &rpc_vmm_display_server,            // 29
};

//////////////////////////////////////////////
void __attribute__((noinline)) rpc_undefined( xptr_t xp __attribute__ ((unused)) )
{
	assert( false , "called in cluster %x", local_cxy );
}

/***************************************************************************************/
/************ Generic functions supporting RPCs : client side **************************/
/***************************************************************************************/

///////////////////////////////////////
void rpc_send( cxy_t        server_cxy, 
               rpc_desc_t * rpc )
{
    lid_t              server_core_lid;
    lid_t              client_core_lid;
    volatile error_t   full;
    thread_t         * this;

    full            = 0;
    this            = CURRENT_THREAD;
    client_core_lid = this->core->lid;

#if DEBUG_RPC_CLIENT_GENERIC
uint32_t cycle = (uint32_t)hal_get_cycles();
if( DEBUG_RPC_CLIENT_GENERIC < cycle ) 
printk("\n[DBG] %s : thread %x in process %x enter for rpc[%d] / cycle %d\n",
__FUNCTION__, this->trdid, this->process->pid, rpc->index, cycle );
#endif

    // select a server_core : use client core index if possible / core 0 otherwise
    if( client_core_lid < hal_remote_lw( XPTR( server_cxy , &LOCAL_CLUSTER->cores_nr ) ) )
    {
        server_core_lid = client_core_lid;
    }
    else
    {   
        server_core_lid = 0;
    }

    // register client_thread pointer and client_core lid in RPC descriptor
    rpc->thread = this;
    rpc->lid    = client_core_lid;

    // build extended pointer on the RPC descriptor
	xptr_t   desc_xp = XPTR( local_cxy , rpc );

    // get local pointer on rpc_fifo in remote cluster,
    remote_fifo_t * rpc_fifo = &LOCAL_CLUSTER->rpc_fifo[server_core_lid];

	// post RPC in remote fifo / deschedule and retry if fifo full
    do
    { 
        full = remote_fifo_put_item( XPTR( server_cxy , rpc_fifo ), (uint64_t )desc_xp );
	    if ( full ) 
        {
            printk("\n[WARNING] %s : cluster %x cannot post RPC to cluster %x\n",
            __FUNCTION__ , local_cxy , server_cxy );

            // deschedule without blocking 
            sched_yield("RPC fifo full");
        }
    }
    while( full );
 
    hal_fence();

#if DEBUG_RPC_CLIENT_GENERIC
cycle = (uint32_t)hal_get_cycles();
if( DEBUG_RPC_CLIENT_GENERIC < cycle ) 
printk("\n[DBG] %s : thread %x in process %x / rpc[%d] / rpc_ptr %x / cycle %d\n",
__FUNCTION__, this->trdid, this->process->pid, rpc->index, rpc, cycle );
#endif
	
   // send IPI to the selected server core
   dev_pic_send_ipi( server_cxy , server_core_lid );

    // wait RPC completion before returning if blocking RPC
    // - busy waiting policy during kernel_init, or if threads cannot yield
    // - block and deschedule in all other cases
    if ( rpc->blocking )
    {
        if( (this->type == THREAD_IDLE) || (thread_can_yield() == false) ) // busy waiting
        {

#if DEBUG_RPC_CLIENT_GENERIC
cycle = (uint32_t)hal_get_cycles();
if( DEBUG_RPC_CLIENT_GENERIC < cycle ) 
printk("\n[DBG] %s : thread %x in process %x busy waiting for rpc[%d] / cycle %d\n",
__FUNCTION__, this->trdid, this->process->pid, rpc->index , cycle );
#endif

            while( rpc->responses ) hal_fixed_delay( 100 );
    
#if DEBUG_RPC_CLIENT_GENERIC
cycle = (uint32_t)hal_get_cycles();
if( DEBUG_RPC_CLIENT_GENERIC < cycle ) 
printk("\n[DBG] %s : thread %x in process %x resumes for rpc[%d] / cycle %d\n",
__FUNCTION__, this->trdid, this->process->pid, rpc->index, cycle );
#endif
        } 
        else                                                         // block & deschedule
        {

#if DEBUG_RPC_CLIENT_GENERIC
cycle = (uint32_t)hal_get_cycles();
if( DEBUG_RPC_CLIENT_GENERIC < cycle ) 
printk("\n[DBG] %s : thread %x in process %x blocks & deschedules for rpc[%d] / cycle %d\n",
__FUNCTION__, this->trdid, this->process->pid, rpc->index , cycle );
#endif
            thread_block( XPTR( local_cxy , this ) , THREAD_BLOCKED_RPC );
            sched_yield("blocked on RPC");

#if DEBUG_RPC_CLIENT_GENERIC
cycle = (uint32_t)hal_get_cycles();
if( DEBUG_RPC_CLIENT_GENERIC < cycle ) 
printk("\n[DBG] %s : thread %x in process %x resumes for rpc[%d] / cycle %d\n",
__FUNCTION__, this->trdid, this->process->pid, rpc->index, cycle );
#endif
        }

        // check response available
        assert( (rpc->responses == 0) , "illegal RPC response\n" );
    }
    else  // non blocking RPC
    {

#if DEBUG_RPC_CLIENT_GENERIC
cycle = (uint32_t)hal_get_cycles();
if( DEBUG_RPC_CLIENT_GENERIC < cycle ) 
printk("\n[DBG] %s : thread %x in process %x returns for non blocking rpc[%d] / cycle %d\n",
__FUNCTION__, this->trdid, this->process->pid, rpc->index, cycle );
#endif

    }
}  // end rpc_send()


/***************************************************************************************/
/************ Generic functions supporting RPCs : server side **************************/
/***************************************************************************************/

////////////////
void rpc_check( void )
{
    error_t         error;
    thread_t      * thread;  
    uint32_t        sr_save;

#if DEBUG_RPC_SERVER_GENERIC
uint32_t cycle;
#endif

    bool_t          found    = false;
	thread_t      * this     = CURRENT_THREAD;
    core_t        * core     = this->core;
    scheduler_t   * sched    = &core->scheduler;
	remote_fifo_t * rpc_fifo = &LOCAL_CLUSTER->rpc_fifo[core->lid];

    // interrupted thread not preemptable during RPC chek
	hal_disable_irq( &sr_save );

    // activate (or create) RPC thread if RPC FIFO not empty and no acive RPC thread  
	if( (rpc_fifo->owner == 0) && (local_fifo_is_empty(rpc_fifo) == false) )
    {

#if DEBUG_RPC_SERVER_GENERIC
cycle = (uint32_t)hal_get_cycles();
if( DEBUG_RPC_SERVER_GENERIC < cycle ) 
printk("\n[DBG] %s : RPC FIFO non empty for core[%x,%d] / cycle %d\n",
__FUNCTION__, local_cxy, core->lid, cycle );
#endif

        // search one IDLE RPC thread associated to the selected core   
        list_entry_t * iter;
        LIST_FOREACH( &sched->k_root , iter )
        {
            thread = LIST_ELEMENT( iter , thread_t , sched_list );
            if( (thread->type == THREAD_RPC) && (thread->blocked == THREAD_BLOCKED_IDLE ) ) 
            {
                // unblock found RPC thread
                thread_unblock( XPTR( local_cxy , thread ) , THREAD_BLOCKED_IDLE );

                // exit loop
                found = true;
                break;
            }
        }

        // create new RPC thread for the selected core if not found    
        if( found == false )                    
        {
            error = thread_kernel_create( &thread,
                                          THREAD_RPC, 
			                              &rpc_thread_func, 
                                          NULL,
			                              core->lid );
	         
            assert( (error == 0),
            "no memory to allocate a new RPC thread in cluster %x", local_cxy );

            // unblock created RPC thread
            thread->blocked = 0;

            // update RRPC threads counter  
            hal_atomic_add( &LOCAL_CLUSTER->rpc_threads[core->lid] , 1 );

#if DEBUG_RPC_SERVER_GENERIC
cycle = (uint32_t)hal_get_cycles();
if( DEBUG_RPC_SERVER_GENERIC < cycle ) 
printk("\n[DBG] %s : new RPC thread %x created for core[%x,%d] / cycle %d\n",
__FUNCTION__, thread, local_cxy, core->lid, cycle );
#endif
        }
    }

#if DEBUG_RPC_SERVER_GENERIC
cycle = (uint32_t)hal_get_cycles();
if( DEBUG_RPC_SERVER_GENERIC < cycle ) 
printk("\n[DBG] %s : interrupted thread %x deschedules on core[%x,%d] / cycle %d\n",
__FUNCTION__, this, local_cxy, core->lid, cycle );
#endif

    // interrupted thread always deschedule          
	sched_yield("IPI received");

#if DEBUG_RPC_SERVER_GENERIC
cycle = (uint32_t)hal_get_cycles();
if( DEBUG_RPC_SERVER_GENERIC < cycle ) 
printk("\n[DBG] %s : interrupted thread %x resumes on core[%x,%d] / cycle %d\n",
__FUNCTION__, this, local_cxy, core->lid, cycle );
#endif

    // interrupted thread restore IRQs after resume 
	hal_restore_irq( sr_save );

} // end rpc_check()


//////////////////////
void rpc_thread_func( void )
{
    error_t         empty;              // local RPC fifo state
    xptr_t          desc_xp;            // extended pointer on RPC request
    cxy_t           desc_cxy;           // RPC request cluster (client) 
    rpc_desc_t    * desc_ptr;           // RPC request local pointer 
    uint32_t        index;              // RPC request index 
    thread_t      * client_ptr;         // local pointer on client thread
	thread_t      * server_ptr;         // local pointer on server thread
    xptr_t          server_xp;          // extended pointer on server thread
    lid_t           client_core_lid;    // local index of client core
    lid_t           server_core_lid;    // local index of server core
    bool_t          blocking;           // blocking RPC when true
	remote_fifo_t * rpc_fifo;           // local pointer on RPC fifo
 
    // makes RPC thread not preemptable
	hal_disable_irq( NULL );
  
	server_ptr      = CURRENT_THREAD;
    server_xp       = XPTR( local_cxy , server_ptr );
    server_core_lid = server_ptr->core->lid;
	rpc_fifo        = &LOCAL_CLUSTER->rpc_fifo[server_core_lid];

    // two embedded loops:
    // - external loop : "infinite" RPC thread
    // - internal loop : handle one RPC request per iteration
 
	while(1)  // infinite loop
	{
        // try to take RPC_FIFO ownership
        if( hal_atomic_test_set( &rpc_fifo->owner , server_ptr->trdid ) )
        {

#if DEBUG_RPC_SERVER_GENERIC 
uint32_t cycle = (uint32_t)hal_get_cycles();
if( DEBUG_RPC_SERVER_GENERIC < cycle ) 
printk("\n[DBG] %s : RPC thread %x in cluster %x takes RPC fifo ownership / cycle %d\n",
__FUNCTION__, server_ptr, local_cxy, cycle );
#endif
	        while( 1 )  //  one RPC request per iteration 
            {
  	            empty = local_fifo_get_item( rpc_fifo , (uint64_t *)&desc_xp );

                // exit when FIFO empty or FIFO ownership lost (in case of descheduling)
	            if ( (empty == 0) && (rpc_fifo->owner == server_ptr->trdid) )
                {
                    // get client cluster and pointer on RPC descriptor
                    desc_cxy = GET_CXY( desc_xp );
                    desc_ptr = GET_PTR( desc_xp );

	                index    = hal_remote_lw( XPTR( desc_cxy , &desc_ptr->index ) );
                    blocking = hal_remote_lw( XPTR( desc_cxy , &desc_ptr->blocking ) );

#if DEBUG_RPC_SERVER_GENERIC
cycle = (uint32_t)hal_get_cycles();
if( DEBUG_RPC_SERVER_GENERIC < cycle ) 
printk("\n[DBG] %s : RPC thread %x in cluster %x got rpc[%d] / rpc_cxy %x / rpc_ptr %x\n",
__FUNCTION__, server_ptr, local_cxy, index, desc_cxy, desc_ptr );
#endif
                    // call the relevant server function
                    rpc_server[index]( desc_xp );

#if DEBUG_RPC_SERVER_GENERIC
cycle = (uint32_t)hal_get_cycles();
if( DEBUG_RPC_SERVER_GENERIC < cycle ) 
printk("\n[DBG] %s : RPC thread %x in cluster %x completes rpc[%d] / rpc_ptr %x / cycle %d\n",
__FUNCTION__, server_ptr, local_cxy, index, desc_ptr, cycle );
#endif
                    // decrement response counter in RPC descriptor if blocking
                    if( blocking )
                    {
                        // decrement responses counter in RPC descriptor
                        hal_remote_atomic_add( XPTR( desc_cxy, &desc_ptr->responses ), -1 );

                        // get client thread pointer and client core lid from RPC descriptor
                        client_ptr      = hal_remote_lpt( XPTR( desc_cxy , &desc_ptr->thread ) );
                        client_core_lid = hal_remote_lw ( XPTR( desc_cxy , &desc_ptr->lid ) );

                        // unblock client thread
                        thread_unblock( XPTR( desc_cxy , client_ptr ) , THREAD_BLOCKED_RPC );

                        hal_fence();

#if DEBUG_RPC_SERVER_GENERIC
cycle = (uint32_t)hal_get_cycles();
if( DEBUG_RPC_SERVER_GENERIC < cycle ) 
printk("\n[DBG] %s : RPC thread %x (cluster %x) unblocked client thread %x (cluster %x)\n",
__FUNCTION__, server_ptr, local_cxy, client_ptr, desc_cxy, cycle );
#endif
                        // send IPI to client core
	                    // dev_pic_send_ipi( desc_cxy , client_core_lid );
                    }
		        }
                else
                {
                    break;
                }
         	} // end internal loop

            // release rpc_fifo ownership if not lost
            if( rpc_fifo->owner == server_ptr->trdid ) rpc_fifo->owner = 0;

        }  // end if RPC fifo

        // RPC thread blocks on IDLE 
        thread_block( server_xp , THREAD_BLOCKED_IDLE );

        // sucide if too many RPC threads / simply deschedule otherwise
        if( LOCAL_CLUSTER->rpc_threads[server_core_lid] >= CONFIG_RPC_THREADS_MAX )
	    {

#if DEBUG_RPC_SERVER_GENERIC
uint32_t cycle = (uint32_t)hal_get_cycles();
if( DEBUG_RPC_SERVER_GENERIC < cycle ) 
printk("\n[DBG] %s : RPC thread %x in cluster %x suicides / cycle %d\n",
__FUNCTION__, server_ptr, local_cxy, cycle );
#endif
            // update RPC threads counter
	        hal_atomic_add( &LOCAL_CLUSTER->rpc_threads , -1 );

            // RPC thread blocks on GLOBAL
	        thread_block( server_xp , THREAD_BLOCKED_GLOBAL );

            // RPC thread set the REQ_DELETE flag to suicide
            hal_remote_atomic_or( server_xp , THREAD_FLAG_REQ_DELETE );
	    }
        else
        {

#if DEBUG_RPC_SERVER_GENERIC
uint32_t cycle = (uint32_t)hal_get_cycles();
if( DEBUG_RPC_SERVER_GENERIC < cycle ) 
printk("\n[DBG] %s : RPC thread %x in cluster %x block & deschedules / cycle %d\n",
__FUNCTION__, server_ptr, local_cxy, cycle );
#endif

            // RPC thread deschedules
            assert( thread_can_yield() , "illegal sched_yield\n" );
            sched_yield("RPC fifo empty");
        }

	} // end infinite loop

} // end rpc_thread_func()


/////////////////////////////////////////////////////////////////////////////////////////
// [0]           Marshaling functions attached to RPC_PMEM_GET_PAGES (blocking)
/////////////////////////////////////////////////////////////////////////////////////////

///////////////////////////////////////////////
void rpc_pmem_get_pages_client( cxy_t      cxy,
                                uint32_t   order,      // in 
                                page_t  ** page )      // out 
{
#if DEBUG_RPC_PMEM_GET_PAGES
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_PMEM_GET_PAGES )
printk("\n[DBG] %s : thread %x enter on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif

    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index     = RPC_PMEM_GET_PAGES;
    rpc.blocking  = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor 
    rpc.args[0] = (uint64_t)order;

    // register RPC request in remote RPC fifo
    rpc_send( cxy , &rpc );

    // get output arguments from RPC descriptor
    *page = (page_t *)(intptr_t)rpc.args[1];

#if DEBUG_RPC_PMEM_GET_PAGES
cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_PMEM_GET_PAGES )
printk("\n[DBG] %s : thread %x exit / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , cycle );
#endif
}

///////////////////////////////////////////
void rpc_pmem_get_pages_server( xptr_t xp )
{
#if DEBUG_RPC_PMEM_GET_PAGES
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_PMEM_GET_PAGES )
printk("\n[DBG] %s : thread %x enter on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif

    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        cxy  = GET_CXY( xp );
    rpc_desc_t * desc = GET_PTR( xp );

    // get input arguments from client RPC descriptor
    uint32_t order = (uint32_t)hal_remote_lwd( XPTR( cxy , &desc->args[0] ) );
    
    // call local pmem allocator
    page_t * page = ppm_alloc_pages( order ); 

    // set output arguments into client RPC descriptor
    hal_remote_swd( XPTR( cxy , &desc->args[1] ) , (uint64_t)(intptr_t)page );

#if DEBUG_RPC_PMEM_GET_PAGES
cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_PMEM_GET_PAGES )
printk("\n[DBG] %s : thread %x exit / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , cycle );
#endif
}

/////////////////////////////////////////////////////////////////////////////////////////
// [1]       Marshaling functions attached to RPC_PMEM_RELEASE_PAGES (blocking)
/////////////////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////
void rpc_pmem_release_pages_client( cxy_t     cxy,
                                    page_t  * page )      // out 
{
#if DEBUG_RPC_PMEM_RELEASE_PAGES
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_PMEM_RELEASE_PAGES )
printk("\n[DBG] %s : thread %x enter on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif

    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index    = RPC_PMEM_RELEASE_PAGES;
    rpc.blocking = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor 
    rpc.args[0] = (uint64_t)(intptr_t)page;

    // register RPC request in remote RPC fifo
    rpc_send( cxy , &rpc );

#if DEBUG_RPC_PMEM_RELEASE_PAGES
cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_PMEM_RELEASE_PAGES )
printk("\n[DBG] %s : thread %x exit / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , cycle );
#endif
}

///////////////////////////////////////////////
void rpc_pmem_release_pages_server( xptr_t xp )
{
#if DEBUG_RPC_PMEM_RELEASE_PAGES
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_PMEM_RELEASE_PAGES )
printk("\n[DBG] %s : thread %x enter on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif

    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        cxy  = GET_CXY( xp );
    rpc_desc_t * desc = GET_PTR( xp );

    // get input arguments from client RPC descriptor
    page_t * page = (page_t *)(intptr_t)hal_remote_lwd( XPTR( cxy , &desc->args[0] ) );
    
    // release memory to local pmem 
    kmem_req_t req;
    req.type = KMEM_PAGE;
    req.ptr  = page;
    kmem_free( &req );

#if DEBUG_RPC_PMEM_RELEASE_PAGES
cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_PMEM_RELEASE_PAGES )
printk("\n[DBG] %s : thread %x exit / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , cycle );
#endif
}

/////////////////////////////////////////////////////////////////////////////////////////
// [2]      undefined slot
/////////////////////////////////////////////////////////////////////////////////////////

/////////////////////////////////////////////////////////////////////////////////////////
// [3]           Marshaling functions attached to RPC_PROCESS_MAKE_FORK (blocking)
/////////////////////////////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////
void rpc_process_make_fork_client( cxy_t       cxy,
                                   xptr_t      ref_process_xp,      // in
                                   xptr_t      parent_thread_xp,    // in
                                   pid_t     * child_pid,           // out
                                   thread_t ** child_thread_ptr,    // out     
                                   error_t   * error )              // out
{
#if DEBUG_RPC_PROCESS_MAKE_FORK
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_PROCESS_MAKE_FORK )
printk("\n[DBG] %s : thread %x enter on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif

    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index    = RPC_PROCESS_MAKE_FORK;
    rpc.blocking = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor  
    rpc.args[0] = (uint64_t)ref_process_xp;
    rpc.args[1] = (uint64_t)parent_thread_xp;

    // register RPC request in remote RPC fifo
    rpc_send( cxy , &rpc );

    // get output arguments from RPC descriptor
    *child_pid         = (pid_t)rpc.args[2];
    *child_thread_ptr  = (thread_t *)(intptr_t)rpc.args[3];
    *error             = (error_t)rpc.args[4];     

#if DEBUG_RPC_PROCESS_MAKE_FORK
cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_PROCESS_MAKE_FORK )
printk("\n[DBG] %s : thread %x exit / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , cycle );
#endif
}

//////////////////////////////////////////////
void rpc_process_make_fork_server( xptr_t xp )
{
#if DEBUG_RPC_PROCESS_MAKE_FORK
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_PROCESS_MAKE_FORK )
printk("\n[DBG] %s : thread %x enter on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif

    xptr_t     ref_process_xp;     // extended pointer on reference parent process
    xptr_t     parent_thread_xp;   // extended pointer on parent thread
    pid_t      child_pid;          // child process identifier
    thread_t * child_thread_ptr;   // local copy of exec_info structure
    error_t    error;              // local error status

    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        client_cxy  = GET_CXY( xp );
    rpc_desc_t * desc        = GET_PTR( xp );

    // get input arguments from cient RPC descriptor
    ref_process_xp   = (xptr_t)hal_remote_lwd( XPTR( client_cxy , &desc->args[0] ) );
    parent_thread_xp = (xptr_t)hal_remote_lwd( XPTR( client_cxy , &desc->args[1] ) );

    // call local kernel function
    error = process_make_fork( ref_process_xp,
                               parent_thread_xp,
                               &child_pid,
                               &child_thread_ptr ); 

    // set output argument into client RPC descriptor
    hal_remote_swd( XPTR( client_cxy , &desc->args[2] ) , (uint64_t)child_pid );
    hal_remote_swd( XPTR( client_cxy , &desc->args[3] ) , (uint64_t)(intptr_t)child_thread_ptr );
    hal_remote_swd( XPTR( client_cxy , &desc->args[4] ) , (uint64_t)error );

#if DEBUG_RPC_PROCESS_MAKE_FORK
cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_PROCESS_MAKE_FORK )
printk("\n[DBG] %s : thread %x exit / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , cycle );
#endif
}

/////////////////////////////////////////////////////////////////////////////////////////
// [4]      undefined slot
/////////////////////////////////////////////////////////////////////////////////////////

/////////////////////////////////////////////////////////////////////////////////////////
// [5]      undefined slot
/////////////////////////////////////////////////////////////////////////////////////////

/////////////////////////////////////////////////////////////////////////////////////////
// [6]      Marshaling functions attached to RPC_THREAD_USER_CREATE (blocking)  
/////////////////////////////////////////////////////////////////////////////////////////

/////////////////////////////////////////////////////////
void rpc_thread_user_create_client( cxy_t            cxy,  
                                    pid_t            pid,         // in
                                    void           * start_func,  // in
                                    void           * start_arg,   // in
                                    pthread_attr_t * attr,        // in
                                    xptr_t         * thread_xp,   // out 
                                    error_t        * error )      // out 
{
    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index    = RPC_THREAD_USER_CREATE;
    rpc.blocking = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor 
    rpc.args[0] = (uint64_t)pid;
    rpc.args[1] = (uint64_t)(intptr_t)start_func;
    rpc.args[2] = (uint64_t)(intptr_t)start_arg;
    rpc.args[3] = (uint64_t)(intptr_t)attr;

    // register RPC request in remote RPC fifo
    rpc_send( cxy , &rpc );

    // get output arguments from RPC descriptor
    *thread_xp = (xptr_t)rpc.args[4];
    *error     = (error_t)rpc.args[5];

}

///////////////////////////////////////////////
void rpc_thread_user_create_server( xptr_t xp )
{

    pthread_attr_t * attr_ptr;   // pointer on attributes structure in client cluster 
    pthread_attr_t   attr_copy;  // attributes structure  copy in server cluster
    thread_t       * thread_ptr; // local pointer on thread descriptor
    xptr_t           thread_xp;  // extended pointer on thread descriptor

    pid_t            pid;        // process identifier
    void           * start_func;
    void           * start_arg;
    error_t          error;

    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        client_cxy  = GET_CXY( xp );
    rpc_desc_t * desc        = GET_PTR( xp );

    // get pointer on attributes structure in client cluster from RPC descriptor

    // get input arguments from RPC descriptor
    pid        = (pid_t)                     hal_remote_lwd(XPTR(client_cxy , &desc->args[0]));
    start_func = (void *)(intptr_t)          hal_remote_lwd(XPTR(client_cxy , &desc->args[1]));
    start_arg  = (void *)(intptr_t)          hal_remote_lwd(XPTR(client_cxy , &desc->args[2]));
    attr_ptr   = (pthread_attr_t *)(intptr_t)hal_remote_lwd(XPTR(client_cxy , &desc->args[3]));

    // makes a local copy of attributes structure
    hal_remote_memcpy( XPTR( local_cxy , &attr_copy ),
                       XPTR( client_cxy , attr_ptr ), 
                       sizeof(pthread_attr_t) );
    
    // call kernel function
    error = thread_user_create( pid,
                                start_func,
                                start_arg,
                                &attr_copy,
                                &thread_ptr );

    // set output arguments
    thread_xp = XPTR( local_cxy , thread_ptr );
    hal_remote_swd( XPTR( client_cxy , &desc->args[4] ) , (uint64_t)thread_xp );
    hal_remote_swd( XPTR( client_cxy , &desc->args[5] ) , (uint64_t)error );

}

/////////////////////////////////////////////////////////////////////////////////////////
// [7]      Marshaling functions attached to RPC_THREAD_KERNEL_CREATE (blocking)
/////////////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////
void rpc_thread_kernel_create_client( cxy_t     cxy,
                                      uint32_t  type,        // in
                                      void    * func,        // in
                                      void    * args,        // in
                                      xptr_t  * thread_xp,   // out
                                      error_t * error )      // out
{
    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index    = RPC_THREAD_KERNEL_CREATE;
    rpc.blocking = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor 
    rpc.args[0] = (uint64_t)type;
    rpc.args[1] = (uint64_t)(intptr_t)func;
    rpc.args[2] = (uint64_t)(intptr_t)args;
    
    // register RPC request in remote RPC fifo 
    rpc_send( cxy , &rpc );

    // get output arguments from RPC descriptor
    *thread_xp = (xptr_t)rpc.args[3];
    *error     = (error_t)rpc.args[4];

}

/////////////////////////////////////////////////
void rpc_thread_kernel_create_server( xptr_t xp )
{
    thread_t       * thread_ptr;  // local pointer on thread descriptor
    xptr_t           thread_xp;   // extended pointer on thread descriptor
    lid_t            core_lid;    // core local index
    error_t          error;    

    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        client_cxy  = GET_CXY( xp );
    rpc_desc_t * desc        = GET_PTR( xp );

    // get attributes from RPC descriptor
    uint32_t  type = (uint32_t)       hal_remote_lwd( XPTR( client_cxy , &desc->args[0] ) );
    void    * func = (void*)(intptr_t)hal_remote_lwd( XPTR( client_cxy , &desc->args[1] ) );
    void    * args = (void*)(intptr_t)hal_remote_lwd( XPTR( client_cxy , &desc->args[2] ) );

    // select one core
    core_lid = cluster_select_local_core();

    // call local kernel function
    error = thread_kernel_create( &thread_ptr , type , func , args , core_lid );

    // set output arguments
    thread_xp = XPTR( local_cxy , thread_ptr );
    hal_remote_swd( XPTR( client_cxy , &desc->args[1] ) , (uint64_t)error );
    hal_remote_swd( XPTR( client_cxy , &desc->args[2] ) , (uint64_t)thread_xp );

}

/////////////////////////////////////////////////////////////////////////////////////////
// [8]   undefined slot
/////////////////////////////////////////////////////////////////////////////////////////


/////////////////////////////////////////////////////////////////////////////////////////
// [9] Marshaling functions attached to RPC_PROCESS_SIGACTION (multicast / non blocking)
/////////////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////
void rpc_process_sigaction_client( cxy_t        cxy,
                                   rpc_desc_t * rpc )
{

#if DEBUG_RPC_PROCESS_SIGACTION
uint32_t  cycle  = (uint32_t)hal_get_cycles();
uint32_t  action = rpc->args[0];
pid_t     pid    = rpc->args[1];
if( DEBUG_RPC_PROCESS_SIGACTION < cycle )
printk("\n[DBG] %s : enter to request %s of process %x in cluster %x / cycle %d\n",
__FUNCTION__ , process_action_str( action ) , pid , cxy , cycle );
#endif

    // check some RPC arguments
    assert( (rpc->blocking == false) , "must be non-blocking\n");
    assert( (rpc->index == RPC_PROCESS_SIGACTION ) , "bad RPC index\n" );

    // register RPC request in remote RPC fifo and return
    rpc_send( cxy , rpc );

#if DEBUG_RPC_PROCESS_SIGACTION
cycle = (uint32_t)hal_get_cycles();
if( DEBUG_RPC_PROCESS_SIGACTION < cycle )
printk("\n[DBG] %s : exit after requesting to %s process %x in cluster %x / cycle %d\n",
__FUNCTION__ , process_action_str( action ) , pid , cxy , cycle );
#endif

}  // end rpc_process_sigaction_client() 

//////////////////////////////////////////////
void rpc_process_sigaction_server( xptr_t xp )
{
    pid_t        pid;             // target process identifier
    process_t  * process;         // pointer on local target process descriptor
    uint32_t     action;          // sigaction index
    thread_t   * client_ptr;      // pointer on client thread in client cluster
    xptr_t       client_xp;       // extended pointer client thread
    cxy_t        client_cxy;      // client cluster identifier
    rpc_desc_t * rpc;             // pointer on rpc descriptor in client cluster
    xptr_t       count_xp;        // extended pointer on responses counter
    uint32_t     count_value;     // responses counter value
    lid_t        client_lid;      // client core local index

    // get client cluster identifier and pointer on RPC descriptor
    client_cxy = GET_CXY( xp );
    rpc        = GET_PTR( xp );

    // get arguments from RPC descriptor
    action   = (uint32_t)hal_remote_lwd( XPTR(client_cxy , &rpc->args[0]) );
    pid      = (pid_t)   hal_remote_lwd( XPTR(client_cxy , &rpc->args[1]) );

#if DEBUG_RPC_PROCESS_SIGACTION
uint32_t cycle = (uint32_t)hal_get_cycles();
if( DEBUG_RPC_PROCESS_SIGACTION < cycle )
printk("\n[DBG] %s : enter to %s process %x in cluster %x / cycle %d\n",
__FUNCTION__ , process_action_str( action ) , pid , local_cxy , cycle );
#endif

    // get client thread pointers
    client_ptr = (thread_t *)hal_remote_lpt( XPTR( client_cxy , &rpc->thread ) );
    client_xp  = XPTR( client_cxy , client_ptr );

    // get local process descriptor
    process = cluster_get_local_process_from_pid( pid );

    // call relevant kernel function
    if      ( action == DELETE_ALL_THREADS  ) process_delete_threads ( process , client_xp ); 
    else if ( action == BLOCK_ALL_THREADS   ) process_block_threads  ( process , client_xp ); 
    else if ( action == UNBLOCK_ALL_THREADS ) process_unblock_threads( process );

    // build extended pointer on response counter in RPC
    count_xp = XPTR( client_cxy , &rpc->responses );

    // decrement the responses counter in RPC descriptor,
    count_value = hal_remote_atomic_add( count_xp , -1 );

    // unblock the client thread only if it is the last response.
    if( count_value == 1 )
    {
        // get client core lid
        client_lid    = (lid_t)     hal_remote_lw ( XPTR( client_cxy , &rpc->lid    ) );

        // unblock client thread
        thread_unblock( client_xp , THREAD_BLOCKED_RPC );

        // send an IPI to client core
        // dev_pic_send_ipi( client_cxy , client_lid );
    }

#if DEBUG_RPC_PROCESS_SIGACTION
cycle = (uint32_t)hal_get_cycles();
if( DEBUG_RPC_PROCESS_SIGACTION < cycle )
printk("\n[DBG] %s : exit after %s process %x in cluster %x / cycle %d\n",
__FUNCTION__ , process_action_str( action ) , pid , local_cxy , cycle );
#endif

} // end rpc_process_sigaction_server() 

/////////////////////////////////////////////////////////////////////////////////////////
// [10]     Marshaling functions attached to RPC_VFS_INODE_CREATE  (blocking)
/////////////////////////////////////////////////////////////////////////////////////////

/////////////////////////////////////////////////////
void rpc_vfs_inode_create_client( cxy_t          cxy,     
                                  xptr_t         dentry_xp,  // in
                                  uint32_t       fs_type,    // in
                                  uint32_t       inode_type, // in
                                  void         * extend,     // in
                                  uint32_t       attr,       // in
                                  uint32_t       rights,     // in
                                  uint32_t       uid,        // in
                                  uint32_t       gid,        // in
                                  xptr_t       * inode_xp,   // out
                                  error_t      * error )     // out
{
#if DEBUG_RPC_VFS_INODE_CREATE
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_INODE_CREATE )
printk("\n[DBG] %s : thread %x enter on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif

    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index    = RPC_VFS_INODE_CREATE;
    rpc.blocking = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor 
    rpc.args[0] = (uint64_t)dentry_xp;
    rpc.args[1] = (uint64_t)fs_type;
    rpc.args[2] = (uint64_t)inode_type;
    rpc.args[3] = (uint64_t)(intptr_t)extend;
    rpc.args[4] = (uint64_t)attr;
    rpc.args[5] = (uint64_t)rights;
    rpc.args[6] = (uint64_t)uid;
    rpc.args[7] = (uint64_t)gid;

    // register RPC request in remote RPC fifo
    rpc_send( cxy , &rpc );

    // get output values from RPC descriptor
    *inode_xp = (xptr_t)rpc.args[8];
    *error    = (error_t)rpc.args[9];

#if DEBUG_RPC_VFS_INODE_CREATE
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_INODE_CREATE )
printk("\n[DBG] %s : thread %x exit on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif
}

/////////////////////////////////////////////
void rpc_vfs_inode_create_server( xptr_t xp )
{
#if DEBUG_RPC_VFS_INODE_CREATE
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_INODE_CREATE )
printk("\n[DBG] %s : thread %x enter on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif

    xptr_t           dentry_xp;
    uint32_t         fs_type;
    uint32_t         inode_type;
    void           * extend;
    uint32_t         attr;
    uint32_t         rights;
    uint32_t         uid;
    uint32_t         gid;
    xptr_t           inode_xp;
    error_t          error;

    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        client_cxy  = GET_CXY( xp );
    rpc_desc_t * desc        = GET_PTR( xp );

    // get input arguments from client rpc descriptor
    dentry_xp  = (xptr_t)          hal_remote_lwd( XPTR( client_cxy , &desc->args[0] ) );
    fs_type    = (uint32_t)        hal_remote_lwd( XPTR( client_cxy , &desc->args[1] ) );
    inode_type = (uint32_t)        hal_remote_lwd( XPTR( client_cxy , &desc->args[2] ) );
    extend     = (void *)(intptr_t)hal_remote_lwd( XPTR( client_cxy , &desc->args[3] ) );
    attr       = (uint32_t)        hal_remote_lwd( XPTR( client_cxy , &desc->args[4] ) );
    rights     = (uint32_t)        hal_remote_lwd( XPTR( client_cxy , &desc->args[5] ) );
    uid        = (uid_t)           hal_remote_lwd( XPTR( client_cxy , &desc->args[6] ) );
    gid        = (gid_t)           hal_remote_lwd( XPTR( client_cxy , &desc->args[7] ) );

    // call local kernel function
    error = vfs_inode_create( dentry_xp,
                              fs_type,
                              inode_type,
                              extend,
                              attr,
                              rights,
                              uid,
                              gid,
                              &inode_xp );

    // set output arguments
    hal_remote_swd( XPTR( client_cxy , &desc->args[8] ) , (uint64_t)inode_xp );
    hal_remote_swd( XPTR( client_cxy , &desc->args[9] ) , (uint64_t)error );

#if DEBUG_RPC_VFS_INODE_CREATE
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_INODE_CREATE )
printk("\n[DBG] %s : thread %x exit on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif
}

/////////////////////////////////////////////////////////////////////////////////////////
// [11]          Marshaling functions attached to RPC_VFS_INODE_DESTROY  (blocking)
/////////////////////////////////////////////////////////////////////////////////////////

/////////////////////////////////////////////////////////////
void rpc_vfs_inode_destroy_client( cxy_t                cxy,
                                   struct vfs_inode_s * inode,
                                   error_t            * error )
{
#if DEBUG_RPC_VFS_INODE_DESTROY
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_INODE_DESTROY )
printk("\n[DBG] %s : thread %x enter on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif

    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index    = RPC_VFS_INODE_DESTROY;
    rpc.blocking = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor 
    rpc.args[0] = (uint64_t)(intptr_t)inode;
    
    // register RPC request in remote RPC fifo
    rpc_send( cxy , &rpc );

    // get output argument from RPC descriptor
    *error = (error_t)rpc.args[1];

#if DEBUG_RPC_VFS_INODE_DESTROY
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_INODE_DESTROY )
printk("\n[DBG] %s : thread %x exit on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif
}

//////////////////////////////////////////////
void rpc_vfs_inode_destroy_server( xptr_t xp )
{
#if DEBUG_RPC_VFS_INODE_DESTROY
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_INODE_DESTROY )
printk("\n[DBG] %s : thread %x enter on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif

    vfs_inode_t * inode;
    error_t       error;

    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        client_cxy  = GET_CXY( xp );
    rpc_desc_t * desc        = GET_PTR( xp );

    // get arguments "inode" from client RPC descriptor
    inode = (vfs_inode_t *)(intptr_t)hal_remote_lwd( XPTR( client_cxy , &desc->args[0] ) );
                       
    // call local kernel function
    error = vfs_inode_destroy( inode );

    // set output argument
    hal_remote_swd( XPTR( client_cxy , &desc->args[1] ) , (uint64_t)error );

#if DEBUG_RPC_VFS_INODE_DESTROY
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_INODE_DESTROY )
printk("\n[DBG] %s : thread %x exit on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif
}

/////////////////////////////////////////////////////////////////////////////////////////
// [12]          Marshaling functions attached to RPC_VFS_DENTRY_CREATE  (blocking)
/////////////////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////
void rpc_vfs_dentry_create_client( cxy_t                  cxy,
                                   uint32_t               type,         // in
                                   char                 * name,         // in
                                   struct vfs_inode_s   * parent,       // in
                                   xptr_t               * dentry_xp,    // out
                                   error_t              * error )       // out
{
#if DEBUG_RPC_VFS_DENTRY_CREATE
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_DENTRY_CREATE )
printk("\n[DBG] %s : thread %x enter on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif

    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index    = RPC_VFS_DENTRY_CREATE;
    rpc.blocking = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor 
    rpc.args[0] = (uint64_t)type;
    rpc.args[1] = (uint64_t)(intptr_t)name;
    rpc.args[2] = (uint64_t)(intptr_t)parent;

    // register RPC request in remote RPC fifo
    rpc_send( cxy , &rpc );

    // get output values from RPC descriptor
    *dentry_xp = (xptr_t)rpc.args[3];
    *error     = (error_t)rpc.args[4];

#if DEBUG_RPC_VFS_DENTRY_CREATE
cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_DENTRY_CREATE )
printk("\n[DBG] %s : thread %x exit / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , cycle );
#endif
}

//////////////////////////////////////////////
void rpc_vfs_dentry_create_server( xptr_t xp )
{
#if DEBUG_RPC_VFS_DENTRY_CREATE
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_DENTRY_CREATE )
printk("\n[DBG] %s : thread %x enter on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif

    uint32_t      type;
    char        * name;
    vfs_inode_t * parent;
    xptr_t        dentry_xp;
    error_t       error;
    char          name_copy[CONFIG_VFS_MAX_NAME_LENGTH];

    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        client_cxy  = GET_CXY( xp );
    rpc_desc_t * desc        = GET_PTR( xp );

    // get arguments "name", "type", and "parent" from client RPC descriptor
    type   = (uint32_t)               hal_remote_lwd( XPTR( client_cxy , &desc->args[0] ) );
    name   = (char *)(intptr_t)       hal_remote_lwd( XPTR( client_cxy , &desc->args[1] ) );
    parent = (vfs_inode_t *)(intptr_t)hal_remote_lwd( XPTR( client_cxy , &desc->args[2] ) );

    // makes a local copy of  name
    hal_remote_strcpy( XPTR( local_cxy , name_copy ),
                       XPTR( client_cxy , name ) );

    // call local kernel function
    error = vfs_dentry_create( type,
                               name_copy,
                               parent,
                               &dentry_xp );
    // set output arguments
    hal_remote_swd( XPTR( client_cxy , &desc->args[3] ) , (uint64_t)dentry_xp );
    hal_remote_swd( XPTR( client_cxy , &desc->args[4] ) , (uint64_t)error );

#if DEBUG_RPC_VFS_DENTRY_CREATE
cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_DENTRY_CREATE )
printk("\n[DBG] %s : thread %x exit / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , cycle );
#endif
}

/////////////////////////////////////////////////////////////////////////////////////////
// [13]          Marshaling functions attached to RPC_VFS_DENTRY_DESTROY  (blocking)
/////////////////////////////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////
void rpc_vfs_dentry_destroy_client( cxy_t          cxy,
                                    vfs_dentry_t * dentry,
                                    error_t      * error )
{
#if DEBUG_RPC_VFS_DENTRY_DESTROY
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_DENTRY_DESTROY )
printk("\n[DBG] %s : thread %x enter on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif

    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index    = RPC_VFS_DENTRY_DESTROY;
    rpc.blocking = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor 
    rpc.args[0] = (uint64_t)(intptr_t)dentry;
    
    // register RPC request in remote RPC fifo
    rpc_send( cxy , &rpc );

    // get output argument from RPC descriptor
    *error = (error_t)rpc.args[1];

#if DEBUG_RPC_VFS_DENTRY_DESTROY
cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_DENTRY_DESTROY )
printk("\n[DBG] %s : thread %x exit / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , cycle );
#endif
}

///////////////////////////////////////////////
void rpc_vfs_dentry_destroy_server( xptr_t xp )
{
#if DEBUG_RPC_VFS_DENTRY_DESTROY
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_DENTRY_DESTROY )
printk("\n[DBG] %s : thread %x enter on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif

    vfs_dentry_t * dentry;
    error_t        error;

    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        client_cxy  = GET_CXY( xp );
    rpc_desc_t * desc        = GET_PTR( xp );

    // get arguments "dentry" from client RPC descriptor
    dentry = (vfs_dentry_t *)(intptr_t)hal_remote_lwd( XPTR( client_cxy , &desc->args[0] ) );
                       
    // call local kernel function
    error = vfs_dentry_destroy( dentry );

    // set output argument
    hal_remote_swd( XPTR( client_cxy , &desc->args[1] ) , (uint64_t)error );

#if DEBUG_RPC_VFS_DENTRY_DESTROY
cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_DENTRY_DESTROY )
printk("\n[DBG] %s : thread %x exit / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , cycle );
#endif
}


/////////////////////////////////////////////////////////////////////////////////////////
// [14]          Marshaling functions attached to RPC_VFS_FILE_CREATE  (blocking)
/////////////////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////
void rpc_vfs_file_create_client( cxy_t                  cxy,
                                 struct vfs_inode_s   * inode,       // in
                                 uint32_t               file_attr,   // in
                                 xptr_t               * file_xp,     // out
                                 error_t              * error )      // out
{
#if DEBUG_RPC_VFS_FILE_CREATE
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_FILE_CREATE )
printk("\n[DBG] %s : thread %x enter on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif

    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index    = RPC_VFS_FILE_CREATE;
    rpc.blocking = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor 
    rpc.args[0] = (uint64_t)(intptr_t)inode;
    rpc.args[1] = (uint64_t)file_attr;

    // register RPC request in remote RPC fifo
    rpc_send( cxy , &rpc );

    // get output values from RPC descriptor
    *file_xp = (xptr_t)rpc.args[2];
    *error   = (error_t)rpc.args[3];

#if DEBUG_RPC_VFS_FILE_CREATE
cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_FILE_CREATE )
printk("\n[DBG] %s : thread %x exit / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , cycle );
#endif
}

////////////////////////////////////////////
void rpc_vfs_file_create_server( xptr_t xp )
{
#if DEBUG_RPC_VFS_FILE_CREATE
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_FILE_CREATE )
printk("\n[DBG] %s : thread %x enter on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif

    uint32_t      file_attr;
    vfs_inode_t * inode;
    xptr_t        file_xp;
    error_t       error;

    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        client_cxy  = GET_CXY( xp );
    rpc_desc_t * desc        = GET_PTR( xp );

    // get arguments "file_attr" and "inode" from client RPC descriptor
    inode     = (vfs_inode_t *)(intptr_t)hal_remote_lwd( XPTR( client_cxy , &desc->args[0] ) );
    file_attr = (uint32_t)               hal_remote_lwd( XPTR( client_cxy , &desc->args[1] ) );
                       
    // call local kernel function
    error = vfs_file_create( inode,
                             file_attr,
                             &file_xp );
 
    // set output arguments
    hal_remote_swd( XPTR( client_cxy , &desc->args[2] ) , (uint64_t)file_xp );
    hal_remote_swd( XPTR( client_cxy , &desc->args[3] ) , (uint64_t)error );

#if DEBUG_RPC_VFS_FILE_CREATE
cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_FILE_CREATE )
printk("\n[DBG] %s : thread %x exit / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , cycle );
#endif
}

/////////////////////////////////////////////////////////////////////////////////////////
// [15]          Marshaling functions attached to RPC_VFS_FILE_DESTROY  (blocking)
/////////////////////////////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////
void rpc_vfs_file_destroy_client( cxy_t        cxy,
                                  vfs_file_t * file )
{
#if DEBUG_RPC_VFS_FILE_DESTROY
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_FILE_DESTROY )
printk("\n[DBG] %s : thread %x enter on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif

    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index    = RPC_VFS_FILE_DESTROY;
    rpc.blocking = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor 
    rpc.args[0] = (uint64_t)(intptr_t)file;
    
    // register RPC request in remote RPC fifo
    rpc_send( cxy , &rpc );

#if DEBUG_RPC_VFS_FILE_DESTROY
cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_FILE_DESTROY )
printk("\n[DBG] %s : thread %x exit / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , cycle );
#endif
}

/////////////////////////////////////////////
void rpc_vfs_file_destroy_server( xptr_t xp )
{
#if DEBUG_RPC_VFS_FILE_DESTROY
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_FILE_DESTROY )
printk("\n[DBG] %s : thread %x enter on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif

    vfs_file_t * file;

    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        client_cxy  = GET_CXY( xp );
    rpc_desc_t * desc        = GET_PTR( xp );

    // get arguments "dentry" from client RPC descriptor
    file = (vfs_file_t *)(intptr_t)hal_remote_lwd( XPTR( client_cxy , &desc->args[0] ) );
                       
    // call local kernel function
    vfs_file_destroy( file );

#if DEBUG_RPC_VFS_FILE_DESTROY
cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VFS_FILE_DESTROY )
printk("\n[DBG] %s : thread %x exit / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , cycle );
#endif
}

/////////////////////////////////////////////////////////////////////////////////////////
// [16]          Marshaling functions attached to RPC_VFS_INODE_LOAD   (blocking)
/////////////////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////
void rpc_vfs_inode_load_client( cxy_t         cxy,
                                vfs_inode_t * parent_inode,    // in
                                char        * name,            // in
                                xptr_t        child_inode_xp,  // in
                                error_t     * error )          // out
{
    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index    = RPC_VFS_INODE_LOAD;
    rpc.blocking = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor 
    rpc.args[0] = (uint64_t)(intptr_t)parent_inode;
    rpc.args[1] = (uint64_t)(intptr_t)name;
    rpc.args[2] = (uint64_t)child_inode_xp;

    // register RPC request in remote RPC fifo
    rpc_send( cxy , &rpc );

    // get output values from RPC descriptor
    *error   = (error_t)rpc.args[3];

}

///////////////////////////////////////////
void rpc_vfs_inode_load_server( xptr_t xp )
{
    error_t       error;
    vfs_inode_t * parent;
    xptr_t        child_xp;
    char        * name;

    char          name_copy[CONFIG_VFS_MAX_NAME_LENGTH];

    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        client_cxy  = GET_CXY( xp );
    rpc_desc_t * desc        = GET_PTR( xp );

    // get arguments "parent", "name", and "child_xp"
    parent     = (vfs_inode_t*)(intptr_t)hal_remote_lwd(XPTR(client_cxy , &desc->args[0]));
    name       = (char*)(intptr_t)       hal_remote_lwd(XPTR(client_cxy , &desc->args[1]));
    child_xp   = (xptr_t)                hal_remote_lwd(XPTR(client_cxy , &desc->args[2]));

    // get name local copy
    hal_remote_strcpy( XPTR( local_cxy , name_copy ) ,
                       XPTR( client_cxy , name ) );

    // call the kernel function
    error = vfs_inode_load( parent , name_copy , child_xp );

    // set output argument
    hal_remote_swd( XPTR( client_cxy , &desc->args[3] ) , (uint64_t)error );

}

/////////////////////////////////////////////////////////////////////////////////////////
// [17]          Marshaling functions attached to RPC_VFS_MAPPER_LOAD_ALL  (blocking)
/////////////////////////////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////
void rpc_vfs_mapper_load_all_client( cxy_t         cxy,
                                     vfs_inode_t * inode,      // in
                                     error_t     * error )     // out
{
    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index    = RPC_VFS_MAPPER_LOAD_ALL;
    rpc.blocking = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor 
    rpc.args[0] = (uint64_t)(intptr_t)inode;

    // register RPC request in remote RPC fifo
    rpc_send( cxy , &rpc );

    // get output values from RPC descriptor
    *error   = (error_t)rpc.args[1];

}

////////////////////////////////////////////////
void rpc_vfs_mapper_load_all_server( xptr_t xp )
{
    error_t       error;
    vfs_inode_t * inode;

    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        client_cxy  = GET_CXY( xp );
    rpc_desc_t * desc        = GET_PTR( xp );

    // get arguments "parent", "name", and "child_xp"
    inode = (vfs_inode_t*)(intptr_t)hal_remote_lwd(XPTR(client_cxy , &desc->args[0]));

    // call the kernel function
    error = vfs_mapper_load_all( inode );

    // set output argument
    hal_remote_swd( XPTR( client_cxy , &desc->args[1] ) , (uint64_t)error );

}

/////////////////////////////////////////////////////////////////////////////////////////
// [18]          Marshaling functions attached to RPC_FATFS_GET_CLUSTER  (blocking)
/////////////////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////
void rpc_fatfs_get_cluster_client( cxy_t      cxy,
                                   mapper_t * mapper,    // in
                                   uint32_t   first,     // in
                                   uint32_t   index,     // in
                                   uint32_t * cluster,   // out
                                   error_t  * error )    // out
{
    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index    = RPC_FATFS_GET_CLUSTER;
    rpc.blocking = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor 
    rpc.args[0] = (uint64_t)(intptr_t)mapper;
    rpc.args[1] = (uint64_t)first;
    rpc.args[2] = (uint64_t)index;

    // register RPC request in remote RPC fifo 
    rpc_send( cxy , &rpc );

    // get output argument from rpc descriptor
    *cluster = (uint32_t)rpc.args[3];
    *error   = (error_t)rpc.args[4];

}

//////////////////////////////////////////////
void rpc_fatfs_get_cluster_server( xptr_t xp )
{
    mapper_t    * mapper;
    uint32_t      first;
    uint32_t      index;
    uint32_t      cluster;
    error_t       error;

    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        client_cxy  = GET_CXY( xp );
    rpc_desc_t * desc        = GET_PTR( xp );

    // get input arguments
    mapper = (mapper_t *)(intptr_t)hal_remote_lpt( XPTR( client_cxy , &desc->args[0] ) );
    first  = (uint32_t)            hal_remote_lw ( XPTR( client_cxy , &desc->args[1] ) );
    index  = (uint32_t)            hal_remote_lw ( XPTR( client_cxy , &desc->args[2] ) );

    // call the kernel function
    error = fatfs_get_cluster( mapper , first , index , &cluster );

    // set output argument
    hal_remote_swd( XPTR( client_cxy , &desc->args[3] ) , (uint64_t)cluster );
    hal_remote_swd( XPTR( client_cxy , &desc->args[4] ) , (uint64_t)error );

}

/////////////////////////////////////////////////////////////////////////////////////////
// [20]          Marshaling functions attached to RPC_VMM_GET_VSEG  (blocking)
/////////////////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////
void rpc_vmm_get_vseg_client( cxy_t       cxy,      
                              process_t * process,     // in  
                              intptr_t    vaddr,       // in  
                              xptr_t    * vseg_xp,     // out
                              error_t   * error )      // out
{
#if DEBUG_RPC_VMM_GET_VSEG
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VMM_GET_VSEG )
printk("\n[DBG] %s : thread %x enter on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif

    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index    = RPC_VMM_GET_VSEG;
    rpc.blocking = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor 
    rpc.args[0] = (uint64_t)(intptr_t)process;
    rpc.args[1] = (uint64_t)vaddr;

    // register RPC request in remote RPC fifo
    rpc_send( cxy , &rpc );

    // get output argument from rpc descriptor
    *vseg_xp = rpc.args[2];
    *error   = (error_t)rpc.args[3];

#if DEBUG_RPC_VMM_GET_VSEG
cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VMM_GET_VSEG )
printk("\n[DBG] %s : thread %x exit on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif
}

/////////////////////////////////////////
void rpc_vmm_get_vseg_server( xptr_t xp )
{
#if DEBUG_RPC_VMM_GET_VSEG
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VMM_GET_VSEG )
printk("\n[DBG] %s : thread %x enter on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif

    process_t   * process;
    intptr_t      vaddr;
    vseg_t      * vseg_ptr;
    xptr_t        vseg_xp;
    error_t       error;

    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        client_cxy  = GET_CXY( xp );
    rpc_desc_t * desc        = GET_PTR( xp );

    // get input argument from client RPC descriptor
    process = (process_t *)(intptr_t)hal_remote_lwd( XPTR( client_cxy , &desc->args[0] ) );
    vaddr   = (intptr_t)hal_remote_lwd( XPTR( client_cxy , &desc->args[1] ) );
    
    // call local kernel function
    error = vmm_get_vseg( process , vaddr , &vseg_ptr );

    // set output arguments to client RPC descriptor
    vseg_xp = XPTR( local_cxy , vseg_ptr );
    hal_remote_swd( XPTR( client_cxy , &desc->args[2] ) , (uint64_t)vseg_xp );
    hal_remote_swd( XPTR( client_cxy , &desc->args[3] ) , (uint64_t)error );

#if DEBUG_RPC_VMM_GET_VSEG
cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VMM_GET_VSEG )
printk("\n[DBG] %s : thread %x exit on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif
}


/////////////////////////////////////////////////////////////////////////////////////////
// [21]          Marshaling functions attached to RPC_VMM_GET_PTE  (blocking)
/////////////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////
void rpc_vmm_get_pte_client( cxy_t       cxy,   
                             process_t * process,  // in 
                             vpn_t       vpn,      // in 
                             bool_t      cow,      // in
                             uint32_t  * attr,     // out
                             ppn_t     * ppn,      // out
                             error_t   * error )   // out 
{
#if DEBUG_RPC_VMM_GET_PTE
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VMM_GET_PTE )
printk("\n[DBG] %s : thread %x enter on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif

    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index    = RPC_VMM_GET_PTE;
    rpc.blocking = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor 
    rpc.args[0] = (uint64_t)(intptr_t)process;
    rpc.args[1] = (uint64_t)vpn;
    rpc.args[2] = (uint64_t)cow;

    // register RPC request in remote RPC fifo
    rpc_send( cxy , &rpc );

    // get output argument from rpc descriptor
    *attr  = (uint32_t)rpc.args[3];
    *ppn   = (ppn_t)rpc.args[4];
    *error = (error_t)rpc.args[5];

#if DEBUG_RPC_VMM_GET_PTE
cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VMM_GET_PTE )
printk("\n[DBG] %s : thread %x exit on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif
}

////////////////////////////////////////
void rpc_vmm_get_pte_server( xptr_t xp )
{
#if DEBUG_RPC_VMM_GET_PTE
uint32_t cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VMM_GET_PTE )
printk("\n[DBG] %s : thread %x enter on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif

    process_t   * process;
    vpn_t         vpn;
    bool_t        cow;
    uint32_t      attr;
    ppn_t         ppn;
    error_t       error;

    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        client_cxy  = GET_CXY( xp );
    rpc_desc_t * desc        = GET_PTR( xp );

    // get input argument "process" & "vpn" from client RPC descriptor
    process = (process_t *)(intptr_t)hal_remote_lwd( XPTR( client_cxy , &desc->args[0] ) );
    vpn     = (vpn_t)                hal_remote_lwd( XPTR( client_cxy , &desc->args[1] ) );
    cow     = (bool_t)               hal_remote_lwd( XPTR( client_cxy , &desc->args[2] ) );
    
    // call local kernel function
    error = vmm_get_pte( process , vpn , cow , &attr , &ppn ); 

    // set output argument "attr" & "ppn" to client RPC descriptor
    hal_remote_swd( XPTR( client_cxy , &desc->args[3] ) , (uint64_t)attr );
    hal_remote_swd( XPTR( client_cxy , &desc->args[4] ) , (uint64_t)ppn );
    hal_remote_swd( XPTR( client_cxy , &desc->args[5] ) , (uint64_t)error );

#if DEBUG_RPC_VMM_GET_PTE
cycle = (uint32_t)hal_get_cycles();
if( cycle > DEBUG_RPC_VMM_GET_PTE )
printk("\n[DBG] %s : thread %x exit on core[%x,%d] / cycle %d\n",
__FUNCTION__ , CURRENT_THREAD , local_cxy, CURRENT_THREAD->core->lid , cycle );
#endif
}

/////////////////////////////////////////////////////////////////////////////////////////
// [22]          Marshaling functions attached to RPC_KCM_ALLOC  (blocking)
/////////////////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////
void rpc_kcm_alloc_client( cxy_t      cxy,
                           uint32_t   kmem_type,   // in
                           xptr_t *   buf_xp )     // out
{
    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index    = RPC_KCM_ALLOC;
    rpc.blocking = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor 
    rpc.args[0] = (uint64_t)kmem_type;

    // register RPC request in remote RPC fifo
    rpc_send( cxy , &rpc );

    // get output arguments from RPC descriptor
    *buf_xp = (xptr_t)rpc.args[1];

}

//////////////////////////////////////
void rpc_kcm_alloc_server( xptr_t xp )
{
    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        client_cxy  = GET_CXY( xp );
    rpc_desc_t * desc        = GET_PTR( xp );

    // get input argument "kmem_type" from client RPC descriptor
    uint32_t kmem_type = (uint32_t)hal_remote_lwd( XPTR( client_cxy , &desc->args[0] ) );

    // allocates memory for kcm
    kmem_req_t  req;
    req.type  = kmem_type;
    req.flags = AF_ZERO;
    void * buf_ptr = kmem_alloc( &req );

    // set output argument
    xptr_t buf_xp = XPTR( local_cxy , buf_ptr );
    hal_remote_swd( XPTR( client_cxy , &desc->args[1] ) , (uint64_t)buf_xp );

}   

/////////////////////////////////////////////////////////////////////////////////////////
// [23]          Marshaling functions attached to RPC_KCM_FREE  (blocking)
/////////////////////////////////////////////////////////////////////////////////////////

/////////////////////////////////////////
void rpc_kcm_free_client( cxy_t      cxy,
                          void     * buf,          // in
                          uint32_t   kmem_type )   // in
{
    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index    = RPC_KCM_FREE;
    rpc.blocking = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor 
    rpc.args[0] = (uint64_t)(intptr_t)buf;
    rpc.args[1] = (uint64_t)kmem_type;

    // register RPC request in remote RPC fifo
    rpc_send( cxy , &rpc );

}

/////////////////////////////////////
void rpc_kcm_free_server( xptr_t xp )
{
    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        client_cxy  = GET_CXY( xp );
    rpc_desc_t * desc        = GET_PTR( xp );

    // get input arguments "buf" and "kmem_type" from client RPC descriptor
    void     * buf = (void *)(intptr_t)hal_remote_lwd( XPTR( client_cxy , &desc->args[0] ) );
    uint32_t   kmem_type = (uint32_t)hal_remote_lwd( XPTR( client_cxy , &desc->args[1] ) );

    // releases memory
    kmem_req_t  req;
    req.type = kmem_type;
    req.ptr  = buf;
    kmem_free( &req );

}   

/////////////////////////////////////////////////////////////////////////////////////////
// [24]          Marshaling functions attached to RPC_MAPPER_MOVE_BUFFER
/////////////////////////////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////
void rpc_mapper_move_buffer_client( cxy_t      cxy,
                                    mapper_t * mapper,        // in
                                    bool_t     to_buffer,     // in
                                    bool_t     is_user,       // in
                                    uint32_t   file_offset,   // in
                                    uint64_t   buffer,        // in
                                    uint32_t   size,          // in
                                    error_t  * error )        // out
{
    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index    = RPC_MAPPER_MOVE_BUFFER;
    rpc.blocking = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor 
    rpc.args[0] = (uint64_t)(intptr_t)mapper;
    rpc.args[1] = (uint64_t)to_buffer;
    rpc.args[2] = (uint64_t)is_user;
    rpc.args[3] = (uint64_t)file_offset;
    rpc.args[4] = (uint64_t)buffer;
    rpc.args[5] = (uint64_t)size;

    // register RPC request in remote RPC fifo
    rpc_send( cxy , &rpc );

    // get output values from RPC descriptor
    *error     = (error_t)rpc.args[6];

}

///////////////////////////////////////////////
void rpc_mapper_move_buffer_server( xptr_t xp )
{
    mapper_t * mapper;
    bool_t     to_buffer;
    bool_t     is_user;
    uint32_t   file_offset;
    void     * user_buffer;
    xptr_t     kern_buffer;
    uint32_t   size;
    error_t    error;

    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        client_cxy  = GET_CXY( xp );
    rpc_desc_t * desc        = GET_PTR( xp );

    // get arguments from client RPC descriptor
    mapper      = (mapper_t *)(intptr_t)hal_remote_lwd( XPTR( client_cxy , &desc->args[0] ) );
    to_buffer   =                       hal_remote_lwd( XPTR( client_cxy , &desc->args[1] ) );
    is_user     =                       hal_remote_lwd( XPTR( client_cxy , &desc->args[2] ) );
    file_offset =                       hal_remote_lwd( XPTR( client_cxy , &desc->args[3] ) );
    size        =                       hal_remote_lwd( XPTR( client_cxy , &desc->args[5] ) );

    // call local kernel function
    if( is_user )
    {
        user_buffer = (void *)(intptr_t)hal_remote_lwd( XPTR( client_cxy , &desc->args[4] ) );

        error = mapper_move_user( mapper,
                                  to_buffer,
                                  file_offset,
                                  user_buffer,
                                  size );
    }
    else
    {
        kern_buffer = (xptr_t)hal_remote_lwd( XPTR( client_cxy , &desc->args[4] ) );

        error = mapper_move_kernel( mapper,
                                    to_buffer,
                                    file_offset,
                                    kern_buffer,
                                    size );
    }

    // set output argument to client RPC descriptor
    hal_remote_swd( XPTR( client_cxy , &desc->args[6] ) , (uint64_t)error );

}

/////////////////////////////////////////////////////////////////////////////////////////
// [25]          Marshaling functions attached to RPC_MAPPER_GET_PAGE (blocking)
/////////////////////////////////////////////////////////////////////////////////////////

///////////////////////////////////////////////////////
void rpc_mapper_get_page_client( cxy_t             cxy,
                                 struct mapper_s * mapper,     // in
                                 uint32_t          index,      // in
                                 page_t         ** page )      // out
{
    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index    = RPC_MAPPER_GET_PAGE;
    rpc.blocking = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor 
    rpc.args[0] = (uint64_t)(intptr_t)mapper;
    rpc.args[1] = (uint64_t)index;

    // register RPC request in remote RPC fifo
    rpc_send( cxy , &rpc );

    // get output values from RPC descriptor
    *page = (page_t *)(intptr_t)rpc.args[2];

}

////////////////////////////////////////////
void rpc_mapper_get_page_server( xptr_t xp )
{
    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        cxy  = GET_CXY( xp );
    rpc_desc_t * desc = GET_PTR( xp );

    // get input arguments from client RPC descriptor
    mapper_t * mapper = (mapper_t *)(intptr_t)hal_remote_lwd( XPTR( cxy , &desc->args[0] ) );
    uint32_t   index  = (uint32_t)            hal_remote_lwd( XPTR( cxy , &desc->args[1] ) );
    
    // call local pmem allocator
    page_t * page = mapper_get_page( mapper , index ); 

    // set output arguments into client RPC descriptor
    hal_remote_swd( XPTR( cxy , &desc->args[1] ) , (uint64_t)(intptr_t)page );

}

/////////////////////////////////////////////////////////////////////////////////////////
// [26]          Marshaling functions attached to RPC_VMM_CREATE_VSEG (blocking)
/////////////////////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////
void rpc_vmm_create_vseg_client( cxy_t              cxy,
                                 struct process_s * process,
                                 vseg_type_t        type,
                                 intptr_t           base,
                                 uint32_t           size,
                                 uint32_t           file_offset,
                                 uint32_t           file_size,
                                 xptr_t             mapper_xp,
                                 cxy_t              vseg_cxy,
                                 struct vseg_s   ** vseg )
{
    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index    = RPC_VMM_CREATE_VSEG;
    rpc.blocking = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor 
    rpc.args[0] = (uint64_t)(intptr_t)process;
    rpc.args[1] = (uint64_t)type;
    rpc.args[2] = (uint64_t)base;
    rpc.args[3] = (uint64_t)size;
    rpc.args[4] = (uint64_t)file_offset;
    rpc.args[5] = (uint64_t)file_size;
    rpc.args[6] = (uint64_t)mapper_xp;
    rpc.args[7] = (uint64_t)vseg_cxy;

    // register RPC request in remote RPC fifo
    rpc_send( cxy , &rpc );

    // get output values from RPC descriptor
    *vseg = (vseg_t *)(intptr_t)rpc.args[8];

}

////////////////////////////////////////////
void rpc_vmm_create_vseg_server( xptr_t xp )
{
    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        cxy  = GET_CXY( xp );
    rpc_desc_t * desc = GET_PTR( xp );

    // get input arguments from client RPC descriptor
    process_t * process     = (process_t *)(intptr_t)hal_remote_lwd( XPTR(cxy , &desc->args[0]));
    vseg_type_t type        = (vseg_type_t)(uint32_t)hal_remote_lwd( XPTR(cxy , &desc->args[1]));
    intptr_t    base        = (intptr_t)             hal_remote_lwd( XPTR(cxy , &desc->args[2]));
    uint32_t    size        = (uint32_t)             hal_remote_lwd( XPTR(cxy , &desc->args[3]));
    uint32_t    file_offset = (uint32_t)             hal_remote_lwd( XPTR(cxy , &desc->args[4]));
    uint32_t    file_size   = (uint32_t)             hal_remote_lwd( XPTR(cxy , &desc->args[5]));
    xptr_t      mapper_xp   = (xptr_t)               hal_remote_lwd( XPTR(cxy , &desc->args[6]));
    cxy_t       vseg_cxy    = (cxy_t)(uint32_t)      hal_remote_lwd( XPTR(cxy , &desc->args[7]));
    
    // call local kernel function
    vseg_t * vseg = vmm_create_vseg( process,
                                     type,
                                     base,
                                     size,
                                     file_offset,
                                     file_size,
                                     mapper_xp,
                                     vseg_cxy ); 

    // set output arguments into client RPC descriptor
    hal_remote_swd( XPTR( cxy , &desc->args[8] ) , (uint64_t)(intptr_t)vseg );

}

/////////////////////////////////////////////////////////////////////////////////////////
// [27]         undefined slot
/////////////////////////////////////////////////////////////////////////////////////////

/////////////////////////////////////////////////////////////////////////////////////////
// [28]          Marshaling functions attached to RPC_VMM_SET_COW (blocking)
/////////////////////////////////////////////////////////////////////////////////////////

/////////////////////////////////////////////
void rpc_vmm_set_cow_client( cxy_t       cxy,
                             process_t * process )
{
    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index    = RPC_VMM_SET_COW;
    rpc.blocking = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor 
    rpc.args[0] = (uint64_t)(intptr_t)process;

    // register RPC request in remote RPC fifo
    rpc_send( cxy , &rpc );

}

////////////////////////////////////////
void rpc_vmm_set_cow_server( xptr_t xp )
{
    process_t * process;

    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        cxy  = GET_CXY( xp );
    rpc_desc_t * desc = GET_PTR( xp );

    // get input arguments from client RPC descriptor
    process = (process_t *)(intptr_t)hal_remote_lwd( XPTR(cxy , &desc->args[0]));
    
    // call local kernel function
    vmm_set_cow( process );

}

/////////////////////////////////////////////////////////////////////////////////////////
// [29]          Marshaling functions attached to RPC_VMM_DISPLAY (blocking)
/////////////////////////////////////////////////////////////////////////////////////////

/////////////////////////////////////////////
void rpc_vmm_display_client( cxy_t       cxy,
                             process_t * process,
                             bool_t      detailed )
{
    assert( (cxy != local_cxy) , "target cluster is not remote\n");

    // initialise RPC descriptor header 
    rpc_desc_t  rpc;
    rpc.index    = RPC_VMM_DISPLAY;
    rpc.blocking = true;
    rpc.responses = 1;

    // set input arguments in RPC descriptor 
    rpc.args[0] = (uint64_t)(intptr_t)process;
    rpc.args[1] = (uint64_t)detailed;

    // register RPC request in remote RPC fifo
    rpc_send( cxy , &rpc );

}

////////////////////////////////////////
void rpc_vmm_display_server( xptr_t xp )
{
    process_t * process;
    bool_t      detailed;

    // get client cluster identifier and pointer on RPC descriptor
    cxy_t        cxy  = GET_CXY( xp );
    rpc_desc_t * desc = GET_PTR( xp );

    // get input arguments from client RPC descriptor
    process  = (process_t *)(intptr_t)hal_remote_lwd( XPTR(cxy , &desc->args[0]));
    detailed = (bool_t)               hal_remote_lwd( XPTR(cxy , &desc->args[1]));
    
    // call local kernel function
    vmm_display( process , detailed );

}


