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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [sapi/] [src/] [io.c] - Rev 532
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/* * Input/Output Manager * * * COPYRIGHT (c) 1989-1999. * 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.OARcorp.com/rtems/license.html. * * $Id: io.c,v 1.2 2001-09-27 11:59:20 chris Exp $ */ #include <rtems/system.h> #include <rtems/io.h> #include <rtems/score/isr.h> #include <rtems/score/thread.h> #include <rtems/score/wkspace.h> #include <string.h> /*PAGE * * _IO_Manager_initialization * */ void _IO_Manager_initialization( rtems_driver_address_table *driver_table, unsigned32 number_of_drivers, unsigned32 number_of_devices ) { void *tmp; unsigned32 index; rtems_driver_name_t *np; _IO_Driver_address_table = driver_table; _IO_Number_of_drivers = number_of_drivers; _IO_Number_of_devices = number_of_devices; tmp = _Workspace_Allocate_or_fatal_error( sizeof( rtems_driver_name_t ) * ( number_of_devices + 1 ) ); _IO_Driver_name_table = (rtems_driver_name_t *) tmp; for( index=0, np = _IO_Driver_name_table ; index < _IO_Number_of_devices ; index++, np++ ) { np->device_name = 0; np->device_name_length = 0; np->major = 0; np->minor = 0; } } /*PAGE * * _IO_Initialize_all_drivers * * This routine initializes all device drivers * * Input Paramters: NONE * * Output Parameters: NONE */ 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); } /*PAGE * * rtems_io_register_name * * Associate a name with a driver * * Input Paramters: * device_name - pointer to name string to associate with device * major - device major number to receive name * minor - device minor number to receive name * * Output Parameters: * RTEMS_SUCCESSFUL - if successful * error code - if unsuccessful */ #if 0 rtems_status_code rtems_io_register_name( char *device_name, rtems_device_major_number major, rtems_device_minor_number minor ) { rtems_driver_name_t *np; unsigned32 level; unsigned32 index; /* find an empty slot */ for( index=0, np = _IO_Driver_name_table ; index < _IO_Number_of_devices ; index++, np++ ) { _ISR_Disable(level); if (np->device_name == 0) { np->device_name = device_name; np->device_name_length = strlen(device_name); np->major = major; np->minor = minor; _ISR_Enable(level); return RTEMS_SUCCESSFUL; } _ISR_Enable(level); } return RTEMS_TOO_MANY; } #endif /*PAGE * * rtems_io_lookup_name * * Find what driver "owns" this name * * Input Paramters: * name - name to lookup the associated device * * Output Parameters: * device_info - device associate with name * RTEMS_SUCCESSFUL - if successful * error code - if unsuccessful */ #if 0 rtems_status_code rtems_io_lookup_name( const char *name, rtems_driver_name_t **device_info ) { rtems_driver_name_t *np; unsigned32 index; for( index=0, np = _IO_Driver_name_table ; index < _IO_Number_of_devices ; index++, np++ ) if (np->device_name) if (strncmp(np->device_name, name, np->device_name_length) == 0) { *device_info = np; return RTEMS_SUCCESSFUL; } *device_info = 0; return RTEMS_UNSATISFIED; } #endif /*PAGE * * rtems_io_initialize * * This routine is the initialization directive of the IO manager. * * Input Paramters: * major - device driver number * minor - device number * argument - pointer to argument(s) * * Output Parameters: * returns - return code */ rtems_status_code rtems_io_initialize( rtems_device_major_number major, rtems_device_minor_number minor, void *argument ) { rtems_device_driver_entry callout; if ( major >= _IO_Number_of_drivers ) return RTEMS_INVALID_NUMBER; callout = _IO_Driver_address_table[major].initialization; return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL; } /*PAGE * * rtems_io_open * * This routine is the open directive of the IO manager. * * Input Paramters: * major - device driver number * minor - device number * argument - pointer to argument(s) * * Output Parameters: * returns - return code */ rtems_status_code rtems_io_open( rtems_device_major_number major, rtems_device_minor_number minor, void *argument ) { rtems_device_driver_entry callout; if ( major >= _IO_Number_of_drivers ) return RTEMS_INVALID_NUMBER; callout = _IO_Driver_address_table[major].open; return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL; } /*PAGE * * rtems_io_close * * This routine is the close directive of the IO manager. * * Input Paramters: * major - device driver number * minor - device number * argument - pointer to argument(s) * * Output Parameters: * returns - return code */ rtems_status_code rtems_io_close( rtems_device_major_number major, rtems_device_minor_number minor, void *argument ) { rtems_device_driver_entry callout; if ( major >= _IO_Number_of_drivers ) return RTEMS_INVALID_NUMBER; callout = _IO_Driver_address_table[major].close; return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL; } /*PAGE * * rtems_io_read * * This routine is the read directive of the IO manager. * * Input Paramters: * major - device driver number * minor - device number * argument - pointer to argument(s) * * Output Parameters: * returns - return code */ rtems_status_code rtems_io_read( rtems_device_major_number major, rtems_device_minor_number minor, void *argument ) { rtems_device_driver_entry callout; if ( major >= _IO_Number_of_drivers ) return RTEMS_INVALID_NUMBER; callout = _IO_Driver_address_table[major].read; return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL; } /*PAGE * * rtems_io_write * * This routine is the write directive of the IO manager. * * Input Paramters: * major - device driver number * minor - device number * argument - pointer to argument(s) * * Output Parameters: * returns - return code */ rtems_status_code rtems_io_write( rtems_device_major_number major, rtems_device_minor_number minor, void *argument ) { rtems_device_driver_entry callout; if ( major >= _IO_Number_of_drivers ) return RTEMS_INVALID_NUMBER; callout = _IO_Driver_address_table[major].write; return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL; } /*PAGE * * rtems_io_control * * This routine is the control directive of the IO manager. * * Input Paramters: * major - device driver number * minor - device number * argument - pointer to argument(s) * * Output Parameters: * returns - return code */ rtems_status_code rtems_io_control( rtems_device_major_number major, rtems_device_minor_number minor, void *argument ) { rtems_device_driver_entry callout; if ( major >= _IO_Number_of_drivers ) return RTEMS_INVALID_NUMBER; callout = _IO_Driver_address_table[major].control; return callout ? callout(major, minor, argument) : RTEMS_SUCCESSFUL; }
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