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/*
* memory.c
*
* Copyright (c) 2011 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <common.h>
/*
* Begin and End of memory area for malloc(), and current "brk"
*/
static unsigned long malloc_start;
static unsigned long malloc_end;
static unsigned long malloc_brk;
unsigned long mem_malloc_start(void)
{
return malloc_start;
}
unsigned long mem_malloc_end(void)
{
return malloc_end;
}
void mem_malloc_init(void *start, void *end)
{
malloc_start = (unsigned long)start;
malloc_end = (unsigned long)end;
malloc_brk = malloc_start;
}
static void *sbrk_no_zero(ptrdiff_t increment)
{
unsigned long old = malloc_brk;
unsigned long new = old + increment;
if ((new < malloc_start) || (new > malloc_end))
return NULL;
malloc_brk = new;
return (void *)old;
}
void *sbrk(ptrdiff_t increment)
{
void *old = sbrk_no_zero(increment);
/* Only clear increment, if valid address was returned */
if (old != NULL)
memset(old, 0, increment);
return old;
}
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