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2007-05-29 Joel Sherrill <joel.sherrill@OARcorp.com>

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* sapi/include/confdefs.h, sapi/src/io.c: Readded code to copy driver
	table into Workspace but now it is only done if the application needs
	extra slots for dynamic driver registration. Cleaned up
	rtems_io_register_driver and rtems_io_unregister_driver code and
	added numerous error cases to register.
This commit is contained in:
Joel Sherrill
2007-05-29 18:45:16 +00:00
parent b3117727f5
commit 7a03c09b43
3 changed files with 88 additions and 28 deletions
Download Patch File Download Diff File Expand all files Collapse all files
cpukit/sapi/src/io.c
+75 -23
View File
@@ -40,11 +40,45 @@ void _IO_Manager_initialization(
uint32_t number_of_drivers
)
{
if ( number_of_drivers < drivers_in_table )
uint32_t index;
/*
* 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;
_IO_Driver_address_table = driver_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];
number_of_drivers = drivers_in_table;
}
/*PAGE
@@ -84,44 +118,62 @@ void _IO_Initialize_all_drivers( void )
*/
rtems_status_code rtems_io_register_driver(
rtems_device_major_number major,
rtems_driver_address_table *driver_table,
rtems_device_major_number *registered_major
rtems_device_major_number major,
rtems_driver_address_table *driver_table,
rtems_device_major_number *registered_major
)
{
/*
* Validate the pointer data and contents passed in
*/
if ( !driver_table )
return RTEMS_INVALID_ADDRESS;
if ( !registered_major )
return RTEMS_INVALID_ADDRESS;
if ( !driver_table->initialization_entry && !driver_table->open_entry )
return RTEMS_INVALID_ADDRESS;
*registered_major = 0;
/*
* The requested major number is higher than what is configured.
*/
if ( major >= _IO_Number_of_drivers )
return RTEMS_INVALID_NUMBER;
/*
* Test for initialise/open being present to indicate the driver slot is
* in use.
*/
if ( major >= _IO_Number_of_drivers )
return RTEMS_INVALID_NUMBER;
if ( major == 0 ) {
for ( major = _IO_Number_of_drivers - 1 ; major ; major-- )
if ( _IO_Driver_address_table[major].initialization_entry == 0 &&
_IO_Driver_address_table[major].open_entry == 0 )
boolean found = FALSE;
for ( major = _IO_Number_of_drivers - 1 ; major ; major-- ) {
if ( !_IO_Driver_address_table[major].initialization_entry &&
!_IO_Driver_address_table[major].open_entry ) {
found = TRUE;
break;
}
}
if (( major == 0 ) &&
( _IO_Driver_address_table[major].initialization_entry == 0 &&
_IO_Driver_address_table[major].open_entry == 0 ))
return RTEMS_TOO_MANY;
if ( !found )
return RTEMS_TOO_MANY;
}
if ( _IO_Driver_address_table[major].initialization_entry == 0 &&
_IO_Driver_address_table[major].open_entry == 0 ) {
_IO_Driver_address_table[major] = *driver_table;
*registered_major = major;
if ( _IO_Driver_address_table[major].initialization_entry ||
_IO_Driver_address_table[major].open_entry )
return RTEMS_RESOURCE_IN_USE;
rtems_io_initialize( major, 0, NULL );
return RTEMS_SUCCESSFUL;
}
_IO_Driver_address_table[major] = *driver_table;
*registered_major = major;
return RTEMS_RESOURCE_IN_USE;
rtems_io_initialize( major, 0, NULL );
return RTEMS_SUCCESSFUL;
}
/*PAGE