Lots of hacking to make a very simple "ls" utility.

I added a dead-simple malloc that only allows allocations < 4096 bytes.
It just forwards the request to mmap() every time.

I also added simplified versions of opendir() and readdir().

Kernel/Syscall.h

@@ -26,6 +26,7 @@ enum Function {
     PosixWaitpid = 0x1994,
     PosixMmap = 0x1995,
     PosixMunmap = 0x1996,
+    GetDirEntries = 0x1997,
 };
 
 void initialize();