Adds ocaml-io-page

This OCaml library implements support for efficient handling of I/O
memory pages on Unix and Xen.

Homepage: https://github.com/mirage/io-page

pkgs/development/ocaml-modules/io-page/default.nix

@@ -0,0 +1,24 @@
+{ stdenv, fetchzip, ocaml, findlib, cstruct }:
+
+let version = "1.4.0"; in
+
+stdenv.mkDerivation {
+  name = "ocaml-io-page-${version}";
+
+  src = fetchzip {
+    url = "https://github.com/mirage/io-page/archive/v${version}.tar.gz";
+    sha256 = "05m1gbcy72i6gikdijbkpw8pfygc86a3l4k8ayyl58019l6qa2fq";
+  };
+
+  buildInputs = [ ocaml findlib ];
+  propagatedBuildInputs = [ cstruct ];
+
+  createFindlibDestdir = true;
+
+  meta = {
+    homepage = https://github.com/mirage/io-page;
+    platforms = ocaml.meta.platforms;
+    description = "IO memory page library for Mirage backends";
+    maintainers = with stdenv.lib.maintainers; [ vbgl ];
+  };
+}

pkgs/top-level/all-packages.nix

@@ -3910,6 +3910,8 @@ let
 
     functory = callPackage ../development/ocaml-modules/functory { };
 
+    io-page = callPackage ../development/ocaml-modules/io-page { };
+
     javalib = callPackage ../development/ocaml-modules/javalib {
       extlib = ocaml_extlib_maximal;
     };