diff --git a/zealbooter/lib.h b/zealbooter/lib.h
index 50795a1d..4092ce5e 100644
--- a/zealbooter/lib.h
+++ b/zealbooter/lib.h
@@ -3,6 +3,9 @@
 
 #include <stdint.h>
 #include <memcpy.h>
+#include <memset.h>
+#include <memmove.h>
+#include <memcmp.h>
 #include <print.h>
 
 uint64_t div_roundup_u64(uint64_t a, uint64_t b);
diff --git a/zealbooter/lib/memcmp.c b/zealbooter/lib/memcmp.c
new file mode 100644
index 00000000..dd406ae2
--- /dev/null
+++ b/zealbooter/lib/memcmp.c
@@ -0,0 +1,26 @@
+/* memcmp( const void *, const void *, size_t )
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stddef.h>
+
+int memcmp(const void *s1, const void *s2, size_t n)
+{
+    const unsigned char *p1 = (const unsigned char *)s1;
+    const unsigned char *p2 = (const unsigned char *)s2;
+
+    while (n--)
+    {
+        if (*p1 != *p2)
+        {
+            return *p1 - *p2;
+        }
+
+        ++p1;
+        ++p2;
+    }
+
+    return 0;
+}
+
diff --git a/zealbooter/lib/memcmp.h b/zealbooter/lib/memcmp.h
new file mode 100644
index 00000000..3bbc4ca7
--- /dev/null
+++ b/zealbooter/lib/memcmp.h
@@ -0,0 +1,6 @@
+#ifndef __MEMCMP_H__
+#define __MEMCMP_H__
+
+int memcmp(const void *s1, const void *s2, size_t n);
+
+#endif // __MEMCMP_H__
diff --git a/zealbooter/lib/memmove.c b/zealbooter/lib/memmove.c
new file mode 100644
index 00000000..040402b4
--- /dev/null
+++ b/zealbooter/lib/memmove.c
@@ -0,0 +1,33 @@
+/* memmove( void *, const void *, size_t )
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stddef.h>
+
+void *memmove(void *s1, const void *s2, size_t n)
+{
+    char *dest = (char *)s1;
+    const char *src = (const char *)s2;
+
+    if (dest <= src)
+    {
+        while (n--)
+        {
+            *dest++ = *src++;
+        }
+    }
+    else
+    {
+        src += n;
+        dest += n;
+
+        while (n--)
+        {
+            *--dest = *--src;
+        }
+    }
+
+    return s1;
+}
+
diff --git a/zealbooter/lib/memmove.h b/zealbooter/lib/memmove.h
new file mode 100644
index 00000000..80d5cba6
--- /dev/null
+++ b/zealbooter/lib/memmove.h
@@ -0,0 +1,6 @@
+#ifndef __MEMMOVE_H__
+#define __MEMMOVE_H__
+
+void *memmove(void *s1, const void *s2, size_t n);
+
+#endif // __MEMMOVE_H__
diff --git a/zealbooter/lib/memset.c b/zealbooter/lib/memset.c
new file mode 100644
index 00000000..cf951f09
--- /dev/null
+++ b/zealbooter/lib/memset.c
@@ -0,0 +1,20 @@
+/* memset( void *, int, size_t )
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stddef.h>
+
+void *memset(void *s, int c, size_t n)
+{
+    unsigned char *p = (unsigned char *)s;
+
+    while (n--)
+    {
+        *p++ = (unsigned char)c;
+    }
+
+    return s;
+}
+
+
diff --git a/zealbooter/lib/memset.h b/zealbooter/lib/memset.h
new file mode 100644
index 00000000..78fcb588
--- /dev/null
+++ b/zealbooter/lib/memset.h
@@ -0,0 +1,6 @@
+#ifndef __MEMSET_H__
+#define __MEMSET_H__
+
+void *memset(void *s, int c, size_t n);
+
+#endif // __MEMSET_H__