Add simplified mmap() and munmap() syscalls.

LibC/Makefile

@@ -3,6 +3,7 @@ OBJS = \
        unistd.o \
        string.o \
        process.o \
+       mman.o \
        entry.o
 
 LIBRARY = LibC.a

LibC/mman.cpp

@@ -0,0 +1,16 @@
+#include "mman.h"
+#include <Kernel/Syscall.h>
+
+extern "C" {
+
+void* mmap(void* addr, size_t size)
+{
+    return (void*)Syscall::invoke(Syscall::PosixMmap, (dword)addr, (dword)size);
+}
+
+int munmap(void* addr, size_t size)
+{
+    return Syscall::invoke(Syscall::PosixMunmap, (dword)addr, (dword)size);
+}
+
+}

LibC/mman.h

@@ -0,0 +1,10 @@
+#pragma once
+
+#include "types.h"
+
+extern "C" {
+
+void* mmap(void*, size_t);
+int munmap(void*, size_t);
+
+}