/*
 * sys_display.c - display the current state of a kernel structure on TXT0
 *
 * Author    Alain Greiner (2016,2017,2018,2019,2020)
 *  
 * 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 <hal_kernel_types.h>
#include <hal_uspace.h>
#include <hal_vmm.h>
#include <errno.h>
#include <vmm.h>
#include <cluster.h>
#include <thread.h>
#include <process.h>
#include <string.h>
#include <shared_syscalls.h>
#include <remote_barrier.h>
#include <vfs.h>
#include <mapper.h>

#include <syscalls.h>

/////////////////////////////////////////////////////////////////////////////////
// This static function returns a printable string for the type of display.
/////////////////////////////////////////////////////////////////////////////////

#if DEBUG_SYS_DISPLAY
static char* display_type_str( uint32_t type )
{
    if     ( type == DISPLAY_STRING            ) return "STRING"; 
    else if( type == DISPLAY_VMM               ) return "VMM"; 
    else if( type == DISPLAY_SCHED             ) return "SCHED"; 
    else if( type == DISPLAY_CLUSTER_PROCESSES ) return "CLUSTER_PROCESSES"; 
    else if( type == DISPLAY_VFS               ) return "VFS"; 
    else if( type == DISPLAY_CHDEV             ) return "CHDEV"; 
    else if( type == DISPLAY_TXT_PROCESSES     ) return "TXT_PROCESSES"; 
    else if( type == DISPLAY_DQDT              ) return "DQDT";
    else if( type == DISPLAY_BUSYLOCKS         ) return "BUSYLOCKS"; 
    else if( type == DISPLAY_MAPPER            ) return "MAPPER";
    else if( type == DISPLAY_BARRIER           ) return "BARRIER";
    else if( type == DISPLAY_FAT               ) return "FAT";
    else                                         return "undefined";
}
#endif

/////////////////////////////
int sys_display( reg_t  type,
                 reg_t  arg0,
                 reg_t  arg1,
                 reg_t  arg2 )
{

    error_t     error;
    vseg_t    * vseg;

    thread_t  * this    = CURRENT_THREAD;
    process_t * process = this->process;

#if (DEBUG_SYS_DISPLAY || CONFIG_INSTRUMENTATION_SYSCALLS)
uint64_t     tm_start = hal_get_cycles();
#endif

#if DEBUG_SYS_DISPLAY
tm_start = hal_get_cycles();
if( DEBUG_SYS_DISPLAY < tm_start )
printk("\n[%s] thread[%x,%x] enter / type  %s / cycle = %d\n",
__FUNCTION__, process->pid, this->trdid, display_type_str(type), (uint32_t)tm_start );
#endif

    switch( type )
    {
        ////////////////////
        case DISPLAY_STRING:
        {
            char      kbuf[512];
            uint32_t  length;

            char    * string = (char *)arg0;

            // check string in user space
            error = vmm_get_vseg( process , (intptr_t)arg0 , &vseg );
            if( error )
            {

#if DEBUG_SYSCALLS_ERROR
printk("\n[ERROR] in %s for STRING : string buffer %x unmapped\n",
__FUNCTION__ , (intptr_t)arg0 );
#endif
                this->errno = EINVAL;
                return -1;
            }

            // ckeck string length
            length = hal_strlen_from_uspace( string );
            if( length >= 512 )
            {

#if DEBUG_SYSCALLS_ERROR
printk("\n[ERROR] in %s for STRING : string length %d too large\n",
__FUNCTION__ , length );
#endif
                this->errno = EINVAL;
                return -1;
            }

            // copy string to kernel space
            hal_strcpy_from_uspace( XPTR( local_cxy , kbuf ),
                                    string,
                                    512 );

            // print message on TXT0 kernel terminal
            printk("\n%s / cycle %d\n", kbuf, (uint32_t)hal_get_cycles() );

            break;
        }
        /////////////////
        case DISPLAY_VMM:
        {
            cxy_t cxy      = (cxy_t)arg0;
            pid_t pid      = (pid_t)arg1;
            bool_t mapping = (arg2 != 0);

            // check cxy argument
	        if( cluster_is_active( cxy ) == false ) 
            {

#if DEBUG_SYSCALLS_ERROR
printk("\n[ERROR] in %s for VMM : process %x in cluster %x not found\n",
__FUNCTION__ , pid , cxy );
#endif
                this->errno = EINVAL;
                return -1;
            }

            // get extended pointer on process PID in cluster CXY
            xptr_t process_xp = cluster_get_process_from_pid_in_cxy( cxy , pid );
	        if( process_xp == XPTR_NULL )
            {

#if DEBUG_SYSCALLS_ERROR
printk("\n[ERROR] in %s for VMM : process %x in cluster %x not found\n",
__FUNCTION__ , pid , cxy );
#endif
                this->errno = EINVAL;
                return -1;
            }

            // call kernel function
	        hal_vmm_display( process_xp , mapping );

            break;
        }
        ///////////////////
        case DISPLAY_SCHED:
        {
            cxy_t cxy = (cxy_t)arg0;
            lid_t lid = (lid_t)arg1;

            // check cxy argument
	        if( cluster_is_active( cxy ) == false ) 
            {

#if DEBUG_SYSCALLS_ERROR
printk("\n[ERROR] in %s for SCHED : illegal cxy argument %x\n",
__FUNCTION__ , cxy );
#endif
                this->errno = EINVAL;
                return -1;
            }

            // check lid argument
            if( lid >= LOCAL_CLUSTER->cores_nr )
            {

#if DEBUG_SYSCALLS_ERROR
printk("\n[ERROR] in %s for SCHED : illegal lid argument %x\n",
__FUNCTION__ , lid );
#endif
                this->errno = EINVAL;
                return -1;
            }

            // call kernel function
            sched_remote_display( cxy , lid );

            break;
        }
        ///////////////////////////////
        case DISPLAY_CLUSTER_PROCESSES:
        {
            cxy_t  cxy   = (cxy_t)arg0;
            bool_t owned = (bool_t)arg1;

            // check cxy argument
	        if( cluster_is_active( cxy ) == false )
            {

#if DEBUG_SYSCALLS_ERROR
printk("\n[ERROR] in %s for CLUSTER_PROCESSES : illegal cxy argument %x\n",
__FUNCTION__ , cxy );
#endif
                this->errno = EINVAL;
                return -1;
            }

            cluster_processes_display( cxy , owned );

            break;
        }
        /////////////////
        case DISPLAY_VFS:
        {
            vfs_display( process->vfs_root_xp );

            break;
        }
        ///////////////////
        case DISPLAY_CHDEV:
        {
            chdev_dir_display();

            break;
        }
        ///////////////////////////
        case DISPLAY_TXT_PROCESSES:
        {
            uint32_t txt_id = (uint32_t)arg0;

            // check argument
	        if( txt_id >= LOCAL_CLUSTER->nb_txt_channels )
            {

#if DEBUG_SYSCALLS_ERROR
printk("\n[ERROR] in %s for TXT_PROCESSES : illegal txt_id argument %d\n",
__FUNCTION__ , txt_id );
#endif
                this->errno = EINVAL;
                return -1;
            }

            process_txt_display( txt_id );

            break;
        }
        //////////////////
        case DISPLAY_DQDT:
        {
            dqdt_display();

            break;
        }
        ///////////////////////
        case DISPLAY_BUSYLOCKS:
        {
            pid_t   pid   = (pid_t)arg0;
            trdid_t trdid = (trdid_t)arg1;

            // get extended pointer on target thread
            xptr_t thread_xp = thread_get_xptr( pid , trdid );

            if( thread_xp == XPTR_NULL )
            {

#if DEBUG_SYSCALLS_ERROR
printk("\n[ERROR] in %s for BUSYLOCKS : thread[%x,%x] not found\n",
__FUNCTION__ , pid, trdid );
#endif
                this->errno = EINVAL;
                return -1;
            }

            thread_display_busylocks( thread_xp , __FUNCTION__ );

            break;
        }
        ////////////////////
        case DISPLAY_MAPPER:
        {
            xptr_t        root_inode_xp;
            xptr_t        inode_xp;
            cxy_t         inode_cxy;
            vfs_inode_t * inode_ptr;
            xptr_t        mapper_xp;
            mapper_t    * mapper_ptr;
            xptr_t        page_xp;

            char          kbuf[CONFIG_VFS_MAX_PATH_LENGTH];

            char     * path    = (char *)arg0;
            uint32_t   page_id = (uint32_t)arg1;
            uint32_t   nbytes  = (uint32_t)arg2;

            // check pathname length
            if( hal_strlen_from_uspace( path ) >= CONFIG_VFS_MAX_PATH_LENGTH )
            {

#if DEBUG_SYSCALLS_ERROR
printk("\n[ERROR] in %s for MAPPER : pathname too long\n",
 __FUNCTION__ );
#endif
                this->errno = EINVAL;
                return -1;
            }

            // check nbytes
            if( nbytes >= 4096 )
            {

#if DEBUG_SYSCALLS_ERROR
printk("\n[ERROR] in %s for MAPPER : nbytes cannot be larger than 4096\n",
 __FUNCTION__ );
#endif
                this->errno = EINVAL;
                return -1;
            }
            
            // copy pathname in kernel space
            hal_strcpy_from_uspace( XPTR( local_cxy , kbuf ),
                                    path,
                                    CONFIG_VFS_MAX_PATH_LENGTH );

            // compute root inode for pathname 
            if( kbuf[0] == '/' )                        // absolute path
            {
                // use extended pointer on VFS root inode
                root_inode_xp = process->vfs_root_xp;
            }
            else                                        // relative path
            {
                // get cluster and local pointer on reference process
                xptr_t      ref_xp  = process->ref_xp;
                process_t * ref_ptr = (process_t *)GET_PTR( ref_xp );
                cxy_t       ref_cxy = GET_CXY( ref_xp );

                // get extended pointer on CWD inode
                root_inode_xp = hal_remote_l64( XPTR( ref_cxy , &ref_ptr->cwd_xp ) );
            }

            // get extended pointer on target inode
            error = vfs_lookup( root_inode_xp,
                                kbuf,
                                0,
                                &inode_xp,
                                NULL );
            if( error )
	        {

#if DEBUG_SYSCALLS_ERROR
printk("\n[ERROR] in %s for MAPPER : cannot found inode <%s>\n",
__FUNCTION__ , kbuf );
#endif
		        this->errno = ENFILE;
		        return -1;
	        }
   
            // get target inode cluster and local pointer
            inode_cxy = GET_CXY( inode_xp );
            inode_ptr = GET_PTR( inode_xp );

            // get extended pointer on target mapper
            mapper_ptr = hal_remote_lpt( XPTR( inode_cxy , &inode_ptr->mapper ) );
            mapper_xp  = XPTR( inode_cxy , mapper_ptr );

            // get extended pointer on target page
            page_xp = mapper_get_page( mapper_xp , page_id );

            if( page_xp == XPTR_NULL )
	        {

#if DEBUG_SYSCALLS_ERROR
printk("\n[ERROR] in %s for MAPPER : cannot get page %d\n",
__FUNCTION__ , page_id );
#endif
		        this->errno = ENFILE;
		        return -1;
	        }

            // display mapper
            mapper_display_page( mapper_xp , page_xp , nbytes );


            break;
        }
        /////////////////////
        case DISPLAY_BARRIER:
        {
            // get target process PID
            pid_t pid = (pid_t)arg0;

            // get pointers on owner process
            xptr_t      process_xp  = cluster_get_reference_process_from_pid( pid );
            process_t * process_ptr = GET_PTR( process_xp );
            cxy_t       process_cxy = GET_CXY( process_xp );

            if( process_xp == XPTR_NULL )
            {

#if DEBUG_SYSCALLS_ERROR
printk("\n[ERROR] in %s for BARRIER : process %x not found\n",
__FUNCTION__ , pid );
#endif
                this->errno = EINVAL;
                return -1;
            }

            // get extended pointer on root of list of barriers
            xptr_t root_xp = XPTR( process_cxy , &process_ptr->barrier_root );

            if( xlist_is_empty( root_xp ) )
            {

#if DEBUG_SYSCALLS_ERROR
printk("\n[ERROR] in %s for BARRIER : no registered barrier in process %x\n",
__FUNCTION__ , pid );
#endif
                this->errno = EINVAL;
                return -1;
            }

            // get extended pointer on first registered generic barrier descriptor
            xptr_t gen_barrier_xp  = XLIST_FIRST( root_xp , generic_barrier_t , list );

            // display barrier state
            generic_barrier_display( gen_barrier_xp );

            break;
        }
        /////////////////
        case DISPLAY_FAT:
        {
            uint32_t  slots = (uint32_t)arg1;

            if( slots > 1024 )
	        {

#if DEBUG_SYSCALLS_ERROR
printk("\n[ERROR] in %s for FAT : nb_slots larger than 1024\n",
__FUNCTION__ );
#endif
		        this->errno = EINVAL;
		        return -1;
	        }

            if( slots == 0 )  // display fat context in cluster cxy
            {
                uint32_t  cxy = (uint32_t)arg0;

                if( cluster_is_active( cxy ) == false ) 
                {

#if DEBUG_SYSCALLS_ERROR
printk("\n[ERROR] in %s for FAT : illegal cxy argument %x\n",
__FUNCTION__ , cxy );
#endif
                     this->errno = EINVAL;
                     return -1;
                }

                fatfs_display_ctx( cxy );
            }
            else                  // display nb_slots in page 
            {                        
                uint32_t min  = (uint32_t)arg0;

                fatfs_display_fat( min , slots );
            }

            break;
        }
        ////////
        default: 
        {

#if DEBUG_SYSCALLS_ERROR
printk("\n[ERROR] in %s : undefined display type %d\n",
        __FUNCTION__ , type );
#endif
            this->errno = EINVAL;
            return -1;
        }
    }  // end switch on type

#if (DEBUG_SYS_DISPLAY || CONFIG_INSTRUMENTATION_SYSCALLS)
uint64_t     tm_end = hal_get_cycles();
#endif

#if DEBUG_SYS_DISPLAY
if( DEBUG_SYS_DISPLAY < tm_end )
printk("\n[%s] thread[%x,%x] exit / cycle %d\n",
__FUNCTION__, process->pid, this->trdid, (uint32_t)tm_end );
#endif

#if CONFIG_INSTRUMENTATION_SYSCALLS
hal_atomic_add( &syscalls_cumul_cost[SYS_DISPLAY] , tm_end - tm_start );
hal_atomic_add( &syscalls_occurences[SYS_DISPLAY] , 1 );
#endif

    return 0;

}  // end sys_display()
