1 files changed, 49 insertions, 0 deletions
diff --git a/src/pkg/runtime/plan9/mem.c b/src/pkg/runtime/plan9/mem.c
new file mode 100644
index 000000000..651e6728e
--- /dev/null
+++ b/src/pkg/runtime/plan9/mem.c
@@ -0,0 +1,49 @@
+// Copyright 2010 The Go Authors.  All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "runtime.h"
+#include "malloc.h"
+
+extern byte end[];
+static byte *bloc = { end };
+
+enum
+{
+	Round = 7
+};
+
+void*
+runtime·SysAlloc(uintptr ask)
+{
+	uintptr bl;
+	
+	// Plan 9 sbrk from /sys/src/libc/9sys/sbrk.c
+	bl = ((uintptr)bloc + Round) & ~Round;
+	if(runtime·brk_((void*)(bl + ask)) < 0)
+		return (void*)-1;
+	bloc = (byte*)bl + ask;
+	return (void*)bl;
+}
+
+void
+runtime·SysFree(void *v, uintptr n)
+{
+	// from tiny/mem.c
+	// Push pointer back if this is a free
+	// of the most recent SysAlloc.
+	n += (n + Round) & ~Round;
+	if(bloc == (byte*)v+n)
+		bloc -= n;	
+}
+
+void
+runtime·SysUnused(void *v, uintptr n)
+{
+	USED(v, n);
+}
+
+void
+runtime·SysMemInit(void)
+{
+}