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Diffstat (limited to 'cpukit/rtems/src/regionextend.c')
-rw-r--r-- | cpukit/rtems/src/regionextend.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/cpukit/rtems/src/regionextend.c b/cpukit/rtems/src/regionextend.c new file mode 100644 index 0000000000..f4b6c93c2d --- /dev/null +++ b/cpukit/rtems/src/regionextend.c @@ -0,0 +1,96 @@ +/* + * Region Manager - Extend (add memory to) a Region + * + * COPYRIGHT (c) 1989-2009. + * 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.com/license/LICENSE. + * + * $Id$ + */ + +#if HAVE_CONFIG_H +#include "config.h" +#endif + +#include <rtems/system.h> +#include <rtems/rtems/status.h> +#include <rtems/rtems/support.h> +#include <rtems/score/object.h> +#include <rtems/rtems/options.h> +#include <rtems/rtems/region.h> +#include <rtems/score/states.h> +#include <rtems/score/thread.h> +#include <rtems/score/apimutex.h> + +/*PAGE + * + * rtems_region_extend + * + * This directive attempts to grow a region of physical contiguous memory area + * from which variable sized segments can be allocated. + * + * Input parameters: + * id - id of region to grow + * start - starting address of memory area for extension + * length - physical length in bytes to grow the region + * + * Output parameters: + * RTEMS_SUCCESSFUL - if successful + * error code - if unsuccessful + */ + +rtems_status_code rtems_region_extend( + rtems_id id, + void *starting_address, + uintptr_t length +) +{ + uintptr_t amount_extended; + bool extend_ok; + Objects_Locations location; + rtems_status_code return_status; + Region_Control *the_region; + + if ( !starting_address ) + return RTEMS_INVALID_ADDRESS; + + _RTEMS_Lock_allocator(); /* to prevent deletion */ + + the_region = _Region_Get( id, &location ); + switch ( location ) { + + case OBJECTS_LOCAL: + + extend_ok = _Heap_Extend( + &the_region->Memory, + starting_address, + length, + &amount_extended + ); + + if ( extend_ok ) { + the_region->length += amount_extended; + the_region->maximum_segment_size += amount_extended; + return_status = RTEMS_SUCCESSFUL; + } else { + return_status = RTEMS_INVALID_ADDRESS; + } + break; + +#if defined(RTEMS_MULTIPROCESSING) + case OBJECTS_REMOTE: /* this error cannot be returned */ + break; +#endif + + case OBJECTS_ERROR: + default: + return_status = RTEMS_INVALID_ID; + break; + } + + _RTEMS_Unlock_allocator(); + return return_status; +} |