xen: Mini-OS source code with make links target applied

Mini-OS is a tiny OS kernel distributed with the Xen Project Hypervisor
sources. It is mainly used as operating system for stub domains that are
used for Dom0 Disaggregation.

The Mini-OS source tree is updated and released in coordination with Xen
releases. The Mini-OS source tree and architecture-specific symbolic
links are required for building the dependencies used to build Xen
stubodmains. For convenience, the make links target was executed before
packaging. Otherwise, this is a source package. The current build
methods for Xen stubdomains require either a source archive which
contains the Mini-OS source code or execution of a make target that will
fetch the appropriate Mini-OS source tree from it's git repository. This
recipe removes the mysticism of relating to the version of Mini-OS being
used and it's origins and provides the flexibility to easily changes
versions or patch as necessary.

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

recipes-extended/xen/files/mini-os_udivmoddi4-gcc7.patch

@@ -0,0 +1,43 @@
+From d991bdbc062248221511ecb795617c36b37e1d2e Mon Sep 17 00:00:00 2001
+From: Wei Liu <wei.liu2@citrix.com>
+Date: Wed, 9 Aug 2017 13:15:48 +0100
+Subject: [PATCH] lib/math.c: implement __udivmoddi4
+
+Some code compiled by gcc 7 requires this.
+
+Signed-off-by: Wei Liu <wei.liu2@citrix.com>
+Reviewed-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
+---
+ lib/math.c | 10 ++++++++++
+ 1 file changed, 10 insertions(+)
+
+diff --git a/lib/math.c b/lib/math.c
+index 561393e..b98cc1d 100644
+--- a/lib/math.c
++++ b/lib/math.c
+@@ -6,6 +6,7 @@
+  *        File: math.c
+  *      Author: Rolf Neugebauer (neugebar@dcs.gla.ac.uk)
+  *     Changes: 
++ *        Implement __udivmoddi4 (Wei Liu <wei.liu2@citrix.com>)
+  *              
+  *        Date: Aug 2003
+  * 
+@@ -397,6 +398,15 @@ __umoddi3(u_quad_t a, u_quad_t b)
+ }
+ 
+ /*
++ * Returns the quotient and places remainder in r
++ */
++u_quad_t
++__udivmoddi4(u_quad_t a, u_quad_t b, u_quad_t *r)
++{
++	return __qdivrem(a, b, r);
++}
++
++/*
+  * From
+  * moddi3.c
+  */
+--
+2.11.0

recipes-extended/xen/mini-os.inc

@@ -0,0 +1,28 @@
+# Copyright (C) 2018 kebodiker <kurt.bodiker@braintrust-us.com>
+# Released under the MIT license (see COPYING.MIT for the terms)
+
+require stubdom.inc
+
+# clear this out to break dependency circle
+DEPENDS = ""
+
+do_configure() {
+    ${MAKE} -C ${WORKDIR}/mini-os links
+}
+
+# Nothing to configure or compile
+do_compile[noexec] = "1"
+
+# needed because this directory isn't typically part of a sysroot
+SYSROOT_DIRS += "${prefix}/mini-os"
+RDEPENDS_${PN}-dev = "perl"
+
+FILES_${PN}-dev = "\
+    ${prefix} \
+"
+
+do_install() {
+    install -d ${D}${prefix}/mini-os
+    cp -r -t ${D}${prefix}/mini-os ${S}/*
+    rm -rf ${D}${prefix}/mini-os/scripts
+}

recipes-extended/xen/mini-os_4.9.0.bb

@@ -0,0 +1,18 @@
+# Copyright (C) 2017 Kurt Bodiker <kurt.bodiker@braintrust-us.com>
+# Released under the MIT license (see COPYING.MIT for the terms)
+
+DESCRIPTION = "Mini-OS is a tiny OS kernel distributed with the Xen Project"
+HOMEPAGE = "https://wiki.xenproject.org/wiki/Mini-OS"
+LICENSE = "GPLv2"
+LIC_FILES_CHKSUM = "file://COPYING;md5=8a437231894440a8f7629caa372243d0"
+
+# git commit hash for tags: xen-RELEASE-4.9.0, xen-RELEASE-4.9.1, xen-RELEASE-4.9.2
+SRCREV_minios = "ca013fa9baf92f47469ba1f2e1aaa31c41d8a0bb"
+SRC_URI = "\
+    git://xenbits.xen.org/mini-os.git;protocol=git;nobranch=1;destsuffix=mini-os;name=minios \
+    file://mini-os_udivmoddi4-gcc7.patch \
+"
+S="${WORKDIR}/mini-os"
+B="${S}"
+
+require mini-os.inc