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/**
* @file
*
* @brief Workspace Handler Support
* @ingroup RTEMSScoreWorkspace
*/
/*
* 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.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/wkspace.h>
#include <rtems/score/assert.h>
#include <rtems/score/heapimpl.h>
#include <rtems/score/interr.h>
#include <rtems/score/threadimpl.h>
#include <rtems/score/tls.h>
#include <rtems/posix/pthread.h>
#include <rtems/config.h>
#include <rtems/sysinit.h>
#include <string.h>
/* #define DEBUG_WORKSPACE */
#if defined(DEBUG_WORKSPACE)
#include <rtems/bspIo.h>
#endif
Heap_Control _Workspace_Area;
static uintptr_t _Workspace_Space_for_TLS( uintptr_t page_size )
{
uintptr_t tls_size;
uintptr_t space;
tls_size = _TLS_Get_size();
/*
* In case we have a non-zero TLS size, then we need a TLS area for each
* thread. These areas are allocated from the workspace. Ensure that the
* workspace is large enough to fulfill all requests known at configuration
* time (so excluding the unlimited option). It is not possible to estimate
* the TLS size in the configuration at compile-time. The TLS size is
* determined at application link-time.
*/
if ( tls_size > 0 ) {
uintptr_t tls_align = _TLS_Heap_align_up( (uintptr_t) _TLS_Alignment );
uintptr_t tls_alloc = _TLS_Get_allocation_size( tls_size, tls_align );
/*
* Memory allocated with an alignment constraint is allocated from the end
* of a free block. The last allocation may need one free block of minimum
* size.
*/
space = _Heap_Min_block_size( page_size );
space += _Thread_Initial_thread_count
* _Heap_Size_with_overhead( page_size, tls_alloc, tls_align );
} else {
space = 0;
}
return space;
}
static void _Workspace_Initialize( void )
{
_Workspace_Handler_initialization( _Memory_Get(), _Heap_Extend );
}
RTEMS_SYSINIT_ITEM(
_Workspace_Initialize,
RTEMS_SYSINIT_WORKSPACE,
RTEMS_SYSINIT_ORDER_MIDDLE
);
void _Workspace_Handler_initialization(
const Memory_Information *mem,
Heap_Initialization_or_extend_handler extend
)
{
Heap_Initialization_or_extend_handler init_or_extend;
uintptr_t remaining;
bool do_zero;
bool unified;
uintptr_t page_size;
uintptr_t overhead;
size_t i;
page_size = CPU_HEAP_ALIGNMENT;
remaining = rtems_configuration_get_work_space_size();
remaining += _Workspace_Space_for_TLS( page_size );
init_or_extend = _Heap_Initialize;
do_zero = rtems_configuration_get_do_zero_of_workspace();
unified = rtems_configuration_get_unified_work_area();
overhead = _Heap_Area_overhead( page_size );
for ( i = 0; i < _Memory_Get_count( mem ); ++i ) {
Memory_Area *area;
uintptr_t free_size;
area = _Memory_Get_area( mem, i );
free_size = _Memory_Get_free_size( area );
if ( do_zero ) {
memset( _Memory_Get_free_begin( area ), 0, free_size );
}
if ( free_size > overhead ) {
uintptr_t space_available;
uintptr_t size;
if ( unified ) {
size = free_size;
} else {
if ( remaining > 0 ) {
size = remaining < free_size - overhead ?
remaining + overhead : free_size;
} else {
size = 0;
}
}
space_available = ( *init_or_extend )(
&_Workspace_Area,
_Memory_Get_free_begin( area ),
size,
page_size
);
_Memory_Consume( area, size );
if ( space_available < remaining ) {
remaining -= space_available;
} else {
remaining = 0;
}
init_or_extend = extend;
}
}
if ( remaining > 0 ) {
_Internal_error( INTERNAL_ERROR_TOO_LITTLE_WORKSPACE );
}
_Heap_Protection_set_delayed_free_fraction( &_Workspace_Area, 1 );
}
void *_Workspace_Allocate(
size_t size
)
{
void *memory;
memory = _Heap_Allocate( &_Workspace_Area, size );
#if defined(DEBUG_WORKSPACE)
printk(
"Workspace_Allocate(%d) from %p/%p -> %p\n",
size,
__builtin_return_address( 0 ),
__builtin_return_address( 1 ),
memory
);
#endif
return memory;
}
void *_Workspace_Allocate_aligned( size_t size, size_t alignment )
{
return _Heap_Allocate_aligned( &_Workspace_Area, size, alignment );
}
/*
* _Workspace_Free
*/
void _Workspace_Free(
void *block
)
{
#if defined(DEBUG_WORKSPACE)
printk(
"Workspace_Free(%p) from %p/%p\n",
block,
__builtin_return_address( 0 ),
__builtin_return_address( 1 )
);
#endif
_Heap_Free( &_Workspace_Area, block );
}
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