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authorSascha Hauer <s.hauer@pengutronix.de>2011-04-07 17:25:07 +0200
committerSascha Hauer <s.hauer@pengutronix.de>2011-04-11 15:57:51 +0200
commit2a3762495056381e1ef1809b482b670fcd45b6d5 (patch)
treef5ea3bf85ed5bf81baae0c0f79514195bea9010e /common/memory.c
parent4bfc4b44582670182c1519f931cbe0b0efec616e (diff)
downloadbarebox-2a3762495056381e1ef1809b482b670fcd45b6d5.tar.gz
malloc: put common memory functions to seperate file
These functions are needed independently of the specific malloc implementation, so move them out. Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'common/memory.c')
-rw-r--r--common/memory.c71
1 files changed, 71 insertions, 0 deletions
diff --git a/common/memory.c b/common/memory.c
new file mode 100644
index 0000000..8f4a768
--- /dev/null
+++ b/common/memory.c
@@ -0,0 +1,71 @@
+/*
+ * 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;
+}