kernel: move kernel code to kernel/ directly

Also remove mentions of unified kernel in various places in the kernel,
samples and documentation.

Change-Id: Ice43bc73badbe7e14bae40fd6f2a302f6528a77d
Signed-off-by: Anas Nashif <anas.nashif@intel.com>

kernel/thread_abort.c

@@ -0,0 +1,59 @@
+/*
+ * Copyright (c) 2016 Wind River Systems, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file
+ * @brief Primitive for aborting a thread when an arch-specific one is not
+ * needed..
+ */
+
+#include <kernel.h>
+#include <kernel_structs.h>
+#include <nano_internal.h>
+#include <string.h>
+#include <toolchain.h>
+#include <sections.h>
+#include <wait_q.h>
+#include <ksched.h>
+
+extern void _k_thread_single_abort(struct k_thread *thread);
+
+#if !defined(CONFIG_ARCH_HAS_THREAD_ABORT)
+void k_thread_abort(k_tid_t thread)
+{
+	unsigned int key;
+
+	key = irq_lock();
+
+	_k_thread_single_abort(thread);
+	_thread_monitor_exit(thread);
+
+	if (_current == thread) {
+		_Swap(key);
+		CODE_UNREACHABLE;
+	}
+
+	/* The abort handler might have altered the ready queue. */
+	_reschedule_threads(key);
+}
+#endif
+
+/* legacy API */
+
+void task_abort_handler_set(void (*func)(void))
+{
+	_current->fn_abort = func;
+}