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/**
* @file
*
* @brief Initialization of Device Drivers
*
* @ingroup ClassicIO
*/
/*
* COPYRIGHT (c) 1989-2008.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/system.h>
#include <rtems/config.h>
#include <rtems/io.h>
#include <rtems/score/isr.h>
#include <rtems/score/thread.h>
#include <rtems/score/wkspace.h>
#include <string.h>
void _IO_Manager_initialization(void)
{
uint32_t index;
rtems_driver_address_table *driver_table;
uint32_t drivers_in_table;
uint32_t number_of_drivers;
driver_table = rtems_configuration_get_device_driver_table();
drivers_in_table = rtems_configuration_get_number_of_device_drivers();
number_of_drivers = rtems_configuration_get_maximum_drivers();
/*
* If the user claims there are less drivers than are actually in
* the table, then let's just go with the table's count.
*/
if ( number_of_drivers <= drivers_in_table )
number_of_drivers = drivers_in_table;
/*
* If the maximum number of driver is the same as the number in the
* table, then we do not have to copy the driver table. They can't
* register any dynamically.
*/
if ( number_of_drivers == drivers_in_table ) {
_IO_Driver_address_table = driver_table;
_IO_Number_of_drivers = number_of_drivers;
return;
}
/*
* The application requested extra slots in the driver table, so we
* have to allocate a new driver table and copy theirs to it.
*/
_IO_Driver_address_table = (rtems_driver_address_table *)
_Workspace_Allocate_or_fatal_error(
sizeof( rtems_driver_address_table ) * ( number_of_drivers )
);
_IO_Number_of_drivers = number_of_drivers;
memset(
_IO_Driver_address_table, 0,
sizeof( rtems_driver_address_table ) * ( number_of_drivers )
);
for ( index = 0 ; index < drivers_in_table ; index++ )
_IO_Driver_address_table[index] = driver_table[index];
}
void _IO_Initialize_all_drivers( void )
{
rtems_device_major_number major;
for ( major=0 ; major < _IO_Number_of_drivers ; major ++ )
(void) rtems_io_initialize( major, 0, NULL );
}
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