xen: PolarSSL recipe and patches for Xen stubdoms

PolarSSL (now mbedTLS) is a lightweight SSL library optimized for
embedded systems. In the case of Xen stubdomains, we are using MiniOS.
This PolarSSL recipe creates a static library that is cross-compiled
against MiniOS, Xen, LWIP, and Newlib headers and subsequently used
during the cross-compilation and linking of the stubdom specific GMP,
TPM Emulator, and the Xen vTPM and vTPM Manager stubdomains. The
current Xen source code is hardcoded to fetch a specific version of this
package. The patch files originate from the Xen/stubdom source tree.
This recipe provides the flexibility to change version or modify the
patches.

Signed-off-by: Kurt Bodiker <kurt.bodiker@braintrust-us.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>

recipes-extended/xen/files/polarssl.patch

@@ -0,0 +1,64 @@
+diff -Naur polarssl-1.1.4/include/polarssl/config.h polarssl-x86_64/include/polarssl/config.h
+--- a/include/polarssl/config.h	2011-12-22 05:06:27.000000000 -0500
++++ b/include/polarssl/config.h	2012-10-30 17:18:07.567001000 -0400
+@@ -164,8 +164,8 @@
+  * application.
+  *
+  * Uncomment this macro to prevent loading of default entropy functions.
+-#define POLARSSL_NO_DEFAULT_ENTROPY_SOURCES
+  */
++#define POLARSSL_NO_DEFAULT_ENTROPY_SOURCES
+
+ /**
+  * \def POLARSSL_NO_PLATFORM_ENTROPY
+@@ -175,8 +175,8 @@
+  * standards like the /dev/urandom or Windows CryptoAPI.
+  *
+  * Uncomment this macro to disable the built-in platform entropy functions.
+-#define POLARSSL_NO_PLATFORM_ENTROPY
+  */
++#define POLARSSL_NO_PLATFORM_ENTROPY
+
+ /**
+  * \def POLARSSL_PKCS1_V21
+@@ -426,8 +426,8 @@
+  * Requires: POLARSSL_TIMING_C
+  *
+  * This module enables the HAVEGE random number generator.
+- */
+ #define POLARSSL_HAVEGE_C
++ */
+
+ /**
+  * \def POLARSSL_MD_C
+@@ -490,7 +490,7 @@
+  *
+  * This module provides TCP/IP networking routines.
+  */
+-#define POLARSSL_NET_C
++//#define POLARSSL_NET_C
+
+ /**
+  * \def POLARSSL_PADLOCK_C
+@@ -644,8 +644,8 @@
+  * Caller:  library/havege.c
+  *
+  * This module is used by the HAVEGE random number generator.
+- */
+ #define POLARSSL_TIMING_C
++ */
+
+ /**
+  * \def POLARSSL_VERSION_C
+diff -Naur polarssl-1.1.4/library/bignum.c polarssl-x86_64/library/bignum.c
+--- a/library/bignum.c	2012-04-29 16:15:55.000000000 -0400
++++ b/library/bignum.c	2012-10-30 17:21:52.135000999 -0400
+@@ -1101,7 +1101,7 @@
+             Z.p[i - t - 1] = ~0;
+         else
+         {
+-#if defined(POLARSSL_HAVE_LONGLONG)
++#if 0 //defined(POLARSSL_HAVE_LONGLONG)
+             t_udbl r;
+
+             r  = (t_udbl) X.p[i] << biL;

recipes-extended/xen/polarssl.inc

@@ -0,0 +1,27 @@
+# Copyright (C) 2017 Kurt Bodiker <kurt.bodiker@braintrust-us.com>
+# Released under the MIT license (see COPYING.MIT for the terms)
+
+require stubdom.inc
+
+DEPENDS += "\
+    newlib \
+"
+STUBDOM_CFLAGS += "\
+    -Wno-memset-elt-size \
+    -Wno-implicit-fallthrough \
+"
+
+# nothing to configure
+do_configure[noexec] = "1"
+
+do_compile() {
+    ${MAKE} CC="${HOST_PREFIX}gcc --sysroot=${RECIPE_SYSROOT} ${STUBDOM_CPPFLAGS} ${STUBDOM_CFLAGS}"
+}
+
+do_install() {
+    install -d ${D}${includedir}
+    cp -r -t ${D}${includedir} ${S}/include/polarssl
+
+    install -d ${D}/${libdir}
+    install -m 644 -t ${D}/${libdir} ${S}/library/libpolarssl.a
+}

recipes-extended/xen/polarssl_1.1.4.bb

@@ -0,0 +1,19 @@
+# Copyright (C) 2017 Kurt Bodiker <kurt.bodiker@braintrust-us.com>
+# Released under the MIT license (see COPYING.MIT for the terms)
+
+DESCRIPTION = "PolarSSL (now 'mbed TLS') is an open source, portable, easy to use, readable and flexible SSL library."
+HOMEPAGE = "https://tls.mbed.org"
+LICENSE = "GPLv2"
+LIC_FILES_CHKSUM = "file://LICENSE;md5=751419260aa954499f7abaabaa882bbe"
+
+# git hash for release tag polarssl-1.1.4
+SRCREV_polarssl = "d36da11125a9c85c572a4fdf63e0a25e76d7bb18"
+SRC_URI = "\
+    git://github.com/ARMmbed/mbedtls.git;protocol=https;nobranch=1;destsuffix=polarssl;name=polarssl \
+    file://polarssl.patch; \
+"
+
+S="${WORKDIR}/${PN}"
+B="${S}/library"
+
+require polarssl.inc