2011-04-07 15:25:07 +00:00
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/*
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* memory.c
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*
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* Copyright (c) 2011 Sascha Hauer <s.hauer@pengutronix.de>, Pengutronix
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <common.h>
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2011-09-23 08:39:35 +00:00
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#include <memory.h>
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2011-04-07 15:25:07 +00:00
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/*
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* Begin and End of memory area for malloc(), and current "brk"
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*/
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static unsigned long malloc_start;
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static unsigned long malloc_end;
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static unsigned long malloc_brk;
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unsigned long mem_malloc_start(void)
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{
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return malloc_start;
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}
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unsigned long mem_malloc_end(void)
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{
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return malloc_end;
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}
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void mem_malloc_init(void *start, void *end)
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{
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malloc_start = (unsigned long)start;
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malloc_end = (unsigned long)end;
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malloc_brk = malloc_start;
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}
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static void *sbrk_no_zero(ptrdiff_t increment)
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{
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unsigned long old = malloc_brk;
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unsigned long new = old + increment;
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if ((new < malloc_start) || (new > malloc_end))
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return NULL;
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malloc_brk = new;
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return (void *)old;
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}
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void *sbrk(ptrdiff_t increment)
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{
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void *old = sbrk_no_zero(increment);
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/* Only clear increment, if valid address was returned */
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if (old != NULL)
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memset(old, 0, increment);
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return old;
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}
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2011-09-23 08:39:35 +00:00
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LIST_HEAD(memory_banks);
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void barebox_add_memory_bank(const char *name, resource_size_t start,
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resource_size_t size)
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{
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struct memory_bank *bank = xzalloc(sizeof(*bank));
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struct device_d *dev;
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dev = add_mem_device(name, start, size, IORESOURCE_MEM_WRITEABLE);
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bank->dev = dev;
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bank->start = start;
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bank->size = size;
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list_add_tail(&bank->list, &memory_banks);
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}
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