kernel: add header files

include/kernel/channel.h

@@ -0,0 +1,53 @@
+#ifndef KERNEL_CHANNEL_H_
+#define KERNEL_CHANNEL_H_
+
+#include <kernel/object.h>
+#include <kernel/sched.h>
+
+struct kmsg;
+
+struct channel {
+	struct object c_base;
+	unsigned int c_id;
+	struct waitqueue c_wq;
+	struct btree c_msg;
+	struct btree_node c_node;
+};
+
+extern kern_status_t channel_type_init(void);
+
+extern struct channel *channel_create(void);
+
+extern kern_status_t channel_enqueue_msg(
+	struct channel *channel,
+	struct kmsg *msg);
+
+extern kern_status_t channel_recv_msg(
+	struct channel *channel,
+	struct msg *out_msg,
+	msgid_t *out_id,
+	unsigned long *irq_flags);
+extern kern_status_t channel_reply_msg(
+	struct channel *channel,
+	msgid_t id,
+	const struct msg *resp,
+	unsigned long *irq_flags);
+
+extern kern_status_t channel_read_msg(
+	struct channel *channel,
+	msgid_t msg,
+	size_t offset,
+	void *buf,
+	size_t len,
+	size_t *nr_read);
+extern kern_status_t channel_write_msg(
+	struct channel *channel,
+	msgid_t msg,
+	size_t offset,
+	const void *buf,
+	size_t len,
+	size_t *nr_written);
+
+DEFINE_OBJECT_LOCK_FUNCTION(channel, c_base)
+
+#endif