diff --git a/kern/libkern/limits.h b/kern/libkern/limits.h
new file mode 100644
index 0000000..de21df2
--- /dev/null
+++ b/kern/libkern/limits.h
@@ -0,0 +1,26 @@
+/* Support signed or unsigned plain-char */
+
+#if '\xff' > 0
+#define CHAR_MIN 0
+#define CHAR_MAX 255
+#else
+#define CHAR_MIN (-128)
+#define CHAR_MAX 127
+#endif
+
+#define CHAR_BIT   8
+#define SCHAR_MIN  (-128)
+#define SCHAR_MAX  127
+#define UCHAR_MAX  255
+#define SHRT_MIN   (-1 - 0x7fff)
+#define SHRT_MAX   0x7fff
+#define USHRT_MAX  0xffff
+#define INT_MIN    (-1 - 0x7fffffff)
+#define INT_MAX    0x7fffffff
+#define UINT_MAX   0xffffffffU
+#define LONG_MIN   (-LONG_MAX - 1)
+#define LONG_MAX   __LONG_MAX
+#define ULONG_MAX  (2UL * LONG_MAX + 1)
+#define LLONG_MIN  (-LLONG_MAX - 1)
+#define LLONG_MAX  0x7fffffffffffffffLL
+#define ULLONG_MAX (2ULL * LLONG_MAX + 1)
diff --git a/kern/libkern/string.c b/kern/libkern/string.c
index 0d37792..90d852f 100644
--- a/kern/libkern/string.c
+++ b/kern/libkern/string.c
@@ -154,15 +154,10 @@ char *itoa(int value, char *str, int base) {
     return str;
 }
 
-int memcmp(const void *s1, const void *s2, size_t len) {
-    const u8 *a = (const u8 *)s1;
-    const u8 *b = (const u8 *)s2;
-    for (size_t i = 0; i < len; i++) {
-        if (a[i] != b[i]) {
-            return (int)a[i] - (int)b[i];
-        }
-    }
-    return 0;
+int memcmp(const void *vl, const void *vr, size_t n) {
+    const unsigned char *l = vl, *r = vr;
+    for (; n && *l == *r; n--, l++, r++);
+    return n ? *l - *r : 0;
 }
 
 size_t strlen(const char *s) {
diff --git a/kern/start.c b/kern/start.c
index c892765..7d0e855 100644
--- a/kern/start.c
+++ b/kern/start.c
@@ -2,6 +2,7 @@
 #include <banner.h>
 #include <buddy.h>
 #include <config.h>
+#include <freelist.h>
 #include <memory.h>
 #include <panic.h>
 #include <proc.h>
@@ -11,6 +12,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <uart.h>
+#include <util.h>
 
 /**
  * Allocate one stack per CPU (hart).
@@ -39,7 +41,7 @@ void start() {
     // cpu (struct Cpu).
     write_tp(id);
 
-    if (id == 0) {
+    if (unlikely(id == 0)) {
         /* Here we will do a bunch of initialization steps */
         memory_sweep(heap_start, heap_end);
         buddy_init(heap_start, heap_end);
@@ -60,6 +62,23 @@ void start() {
         else
             PANIC("Some cores seem to have been enumerated incorrectly!\n");
 
+        {
+            FreeList fl;
+            void    *mem = buddy_alloc(4096);
+            fl_init(&fl, (uintptr_t)mem, 4096, sizeof(int));
+
+            uint32_t *hello = fl_alloc(&fl);
+
+            *hello = UINT32_MAX;
+
+            int a = fl_available(&fl);
+            assert_msg(fl_check(&fl) > 0, "FreeList checking failed, might be corrupt.");
+            kprintf("Available: %d\n", a);
+            kprintf("Size: %d\n", fl.size);
+
+            buddy_free(mem);
+        }
+
         kprintf("To exit qemu, press CTRL+a followed by x\n");
         spin_unlock(&sl);
     }