topology: system cpu topology

kernel-src/sys/topology.c

@@ -0,0 +1,36 @@
+#include <kernel/topology.h>
+#include <kernel/slab.h>
+#include <logging.h>
+#include <mutex.h>
+#include <spinlock.h>
+#include <util.h>
+
+static scache_t *slab_cache;
+topology_node_t topology_root;
+static MUTEX_DEFINE(allocate_mutex);
+static SPINLOCK_DEFINE(tree_lock);
+
+topology_node_t *topology_create_node(void) {
+	MUTEX_ACQUIRE(&allocate_mutex, false);
+	if (unlikely(slab_cache == NULL)) {
+		slab_cache = slab_newcache(sizeof(topology_node_t), 0, NULL, NULL);
+		__assert(slab_cache);
+	}
+
+	topology_node_t *node = slab_allocate(slab_cache);
+	MUTEX_RELEASE(&allocate_mutex);
+	return node;
+}
+
+void topology_insert(topology_node_t *node, topology_node_t *parent, int id, cpu_t *cpu) {
+	long old_ipl = spinlock_acquireraiseipl(&tree_lock, IPL_MAX);
+
+	node->id = id;
+	node->cpu = cpu;
+
+	node->parent = parent;
+	node->sibling = node->parent->children;
+	node->parent->children = node;
+
+	spinlock_releaseloweripl(&tree_lock, old_ipl);
+}