Index: uspace/lib/posix/include/posix/endian.h
===================================================================
--- uspace/lib/posix/include/posix/endian.h	(revision d0dfbba5d13e96246cfe043af8cdfbe2c5b16a33)
+++ uspace/lib/posix/include/posix/endian.h	(revision d0dfbba5d13e96246cfe043af8cdfbe2c5b16a33)
@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2026 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup libposix
+ * @{
+ */
+/** @file System endianness.
+ */
+
+#ifndef POSIX_ENDIAN_H_
+#define POSIX_ENDIAN_H_
+
+#include <byteorder.h>
+
+#define LITTLE_ENDIAN 1234
+#define BIG_ENDIAN 4321
+
+#ifdef __BE__
+#define BYTE_ORDER BIG_ENDIAN
+#else
+#define BYTE_ORDER LITTLE_ENDIAN
+#endif
+
+#define be16toh uint16_t_be2host
+#define be32toh uint32_t_be2host
+#define be64toh uint64_t_be2host
+
+#define htobe16 host2uint16_t_be
+#define htobe32 host2uint32_t_be
+#define htobe64 host2uint64_t_be
+
+#define htole16 host2uint16_t_le
+#define htole32 host2uint32_t_le
+#define htole64 host2uint64_t_le
+
+#define le16toh uint16_t_le2host
+#define le32toh uint32_t_le2host
+#define le64toh uint64_t_le2host
+
+#endif /* POSIX_ENDIAN_H_ */
+
+/** @}
+ */
Index: uspace/lib/posix/include/posix/sys/param.h
===================================================================
--- uspace/lib/posix/include/posix/sys/param.h	(revision d0dfbba5d13e96246cfe043af8cdfbe2c5b16a33)
+++ uspace/lib/posix/include/posix/sys/param.h	(revision d0dfbba5d13e96246cfe043af8cdfbe2c5b16a33)
@@ -0,0 +1,43 @@
+/*
+ * Copyright (c) 2026 Jiri Svoboda
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * - Redistributions of source code must retain the above copyright
+ *   notice, this list of conditions and the following disclaimer.
+ * - Redistributions in binary form must reproduce the above copyright
+ *   notice, this list of conditions and the following disclaimer in the
+ *   documentation and/or other materials provided with the distribution.
+ * - The name of the author may not be used to endorse or promote products
+ *   derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
+ * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+ * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** @addtogroup libposix
+ * @{
+ */
+/** @file System parameters.
+ */
+
+#ifndef POSIX_SYS_PARAM_H_
+#define POSIX_SYS_PARAM_H_
+
+#include <endian.h>
+
+#endif /* POSIX_SYS_PARAM_H */
+
+/** @}
+ */