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/*
* Early dynamic memory allocation (not freeable) for BSP
* boot routines. Minimum alignment 8 bytes. Memory is
* allocated after _end, it will shrink the workspace.
*
* COPYRIGHT (c) 2011.
* Aeroflex Gaisler AB
*
* 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.
*/
#include <bsp.h>
#include <stdlib.h>
/* Tells us where to put the workspace in case remote debugger is present. */
extern uint32_t rdb_start;
/* Must be aligned to 8 */
extern unsigned int early_mem;
/* must be identical to STACK_SIZE in start.S */
#define STACK_SIZE (16 * 1024)
/* Allocate 8-byte aligned non-freeable pre-malloc() memory. The function
* can be called at any time. The work-area will shrink when called before
* bsp_work_area_initialize(). malloc() is called to get memory when this function
* is called after bsp_work_area_initialize().
*/
void *bsp_early_malloc(int size)
{
void *start;
/* Not early anymore? */
if (early_mem == ~0)
return malloc(size);
size = (size + 7) & ~0x7;
if (rdb_start - STACK_SIZE - early_mem < size)
return NULL;
start = (void *)early_mem;
early_mem += size;
return start;
}
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