From f5ba70cd202300421f8a93fe59071f72d54a45c5 Mon Sep 17 00:00:00 2001
From: Mariano Alvira <mar@devl.org>
Date: Sun, 6 Feb 2011 14:29:01 -0500
Subject: [PATCH] add heap and _sbrk to mc13224v

---
 cpu/mc1322x/contiki-misc.c | 23 +++++++++++++++++++++++
 cpu/mc1322x/mc1322x.lds    |  4 ++--
 2 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/cpu/mc1322x/contiki-misc.c b/cpu/mc1322x/contiki-misc.c
index 9744e943d..30ab28447 100644
--- a/cpu/mc1322x/contiki-misc.c
+++ b/cpu/mc1322x/contiki-misc.c
@@ -36,6 +36,7 @@
 #include <stdio.h>
 #include "contiki.h"
 #include "mc1322x.h"
+#include <sys/types.h>
 
 int raise(void)
 {
@@ -49,3 +50,25 @@ void srand(unsigned int seed) {
 int rand(void) {
 	return (int)*MACA_RANDOM;
 }
+
+extern int  __HEAP_START;
+extern int  __HEAP_END;
+
+caddr_t _sbrk ( int incr )
+{
+	static unsigned char *heap = NULL;
+	unsigned char *prev_heap;
+
+	if (heap == NULL) {
+		heap = (unsigned char *)&__HEAP_START;
+	}
+	prev_heap = heap;
+	/* check removed to show basic approach */
+
+	if((heap + incr) >= (unsigned char *)&__HEAP_END) return((void *)-1);
+
+	heap += incr;
+
+	return (caddr_t) prev_heap;
+}
+
diff --git a/cpu/mc1322x/mc1322x.lds b/cpu/mc1322x/mc1322x.lds
index 85cf11df7..df3ca8895 100644
--- a/cpu/mc1322x/mc1322x.lds
+++ b/cpu/mc1322x/mc1322x.lds
@@ -215,11 +215,11 @@ HEAP_SIZE = 1024;
   . = ALIGN(32 / 8);
 
    .heap : {
-                __heap_start__ = . ;
+                __heap_start__ = . ; PROVIDE(__HEAP_START = .);
                 *(.heap);
                 . += HEAP_SIZE;
                 . = ALIGN (4);
-                __heap_end__ = . ;
+                __heap_end__ = . ;  PROVIDE(__HEAP_END = .);
    }