java/openjdk27: Add port

[haraldei]

Summary

Sponsored by: The FreeBSD Foundation

[haraldei]

OpenJDK27 will be released by upstream on Sept 15. It's most likely going to be the version tagged here, but if there's any updates I'll update the patch.

I'll also update the commit message with links to the upstream release notes and changelogs as well.

[pkubaj]

Two patches are necessary on powerpc64*:

--- src/hotspot/os_cpu/bsd_ppc/prefetch_bsd_ppc.inline.hpp.orig 2026-09-03 11:42:54 UTC
+++ src/hotspot/os_cpu/bsd_ppc/prefetch_bsd_ppc.inline.hpp
@@ -26,8 +26,6 @@
 #ifndef OS_CPU_BSD_PPC_VM_PREFETCH_BSD_PPC_INLINE_HPP
 #define OS_CPU_BSD_PPC_VM_PREFETCH_BSD_PPC_INLINE_HPP

-#include "runtime/prefetch.hpp"
-

 inline void Prefetch::read(const void *loc, intx interval) {
   __asm__ __volatile__ (

--- src/hotspot/os_cpu/bsd_ppc/vm_version_bsd_ppc.cpp.orig  2026-09-03 11:42:54 UTC
+++ src/hotspot/os_cpu/bsd_ppc/vm_version_bsd_ppc.cpp
@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 1997, 2025, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2012, 2025 SAP SE. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "runtime/vm_version.hpp"
+
+#include <sys/types.h>
+#include <sys/sysctl.h>
+
+// FreeBSD exposes a single PPC coherency block size covering both caches.
+static int cacheline_size() {
+  int size = 0;
+  size_t len = sizeof(size);
+  if (sysctlbyname("machdep.cacheline_size", &size, &len, nullptr, 0) != 0 || size <= 0) {
+    return DEFAULT_CACHE_LINE_SIZE;
+  }
+  return size;
+}
+
+int VM_Version::get_dcache_line_size() {
+  return cacheline_size();
+}
+
+int VM_Version::get_icache_line_size() {
+  return cacheline_size();
+}

[pkubaj]

Also, PORTREVISION shouldn't be set for a new port.