kernel: implement globally-unique object ids

include/kernel/object.h

@@ -3,8 +3,8 @@
 
 #include <kernel/flags.h>
 #include <kernel/locks.h>
-#include <mango/status.h>
 #include <kernel/vm.h>
+#include <mango/status.h>
 #include <stddef.h>
 
 #ifdef __cplusplus
@@ -67,6 +67,7 @@ struct object_type {
 
 struct object {
 	uint32_t ob_magic;
+	koid_t ob_id;
 	struct object_type *ob_type;
 	spin_lock_t ob_lock;
 	unsigned int ob_refcount;

kernel/object.c

@@ -7,6 +7,20 @@
 static struct queue object_types;
 static spin_lock_t object_types_lock = SPIN_LOCK_INIT;
 
+static koid_t koid_alloc(void)
+{
+	static koid_t counter = 0;
+	static spin_lock_t lock = SPIN_LOCK_INIT;
+
+	unsigned long flags;
+	spin_lock_irqsave(&lock, &flags);
+	koid_t result = counter;
+	counter++;
+	spin_unlock_irqrestore(&lock, flags);
+
+	return result;
+}
+
 kern_status_t object_bootstrap(void)
 {
 	return KERN_OK;
@@ -53,6 +67,7 @@ struct object *object_create(struct object_type *type)
 	struct object *obj = (struct object *)((unsigned char *)obj_buf
 	                                       + type->ob_header_offset);
 
+	obj->ob_id = koid_alloc();
 	obj->ob_type = type;
 	obj->ob_lock = SPIN_LOCK_INIT;
 	obj->ob_magic = OBJECT_MAGIC;

libmango/include/mango/types.h

@@ -45,6 +45,7 @@ typedef uintptr_t phys_addr_t;
 typedef uintptr_t virt_addr_t;
 typedef uint64_t msgid_t;
 typedef uint64_t off_t;
+typedef uint64_t koid_t;
 typedef unsigned int tid_t;
 typedef uint32_t kern_handle_t;
 typedef uint32_t kern_config_key_t;