/*
 * include/linux/kvmd.h - API for the kernel VM mapping daemon
 *
 * Copyright 2000 Jeff Garzik <jgarzik@mandrakesoft.com>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 *
 */

#ifndef __LINUX_KVMD_H__
#define __LINUX_KVMD_H__

#ifdef __KERNEL__

/* max number of outstanding commands for each thread */
#define KVMD_QUEUE_LEN		16

/* kvmd per-thread flags */
#define KVMD_DEDICATED		(1<<0) /* one-one thread-driver mapping */


struct kvmd_command {
	struct list_head node;
	wait_queue_head_t wait;
	int cmd;
	long arg[4];
};


typedef struct {
	struct list_head node;

	struct task *tsk;
	int flags;

	wait_queue_head_t wait;
	spinlock_t lock;
	struct semaphore thr_start_sem;

	const char *name;
	
	atomic_t n_attach;

	struct kvmd_command cmd [KVMD_QUEUE_LEN];
	struct list_head cmd_list;
	struct list_head free_list;
} kvmd_t;


int kvmd_open (kvmd_t **vmd_out);
void kvmd_close (kvmd_t *vmd);

long kvmd_alloc (kvmd_t *vmd, size_t *vaddr_out, size_t size);
long kvmd_free (kvmd_t *vmd, size_t vaddr, size_t size);

int kvmd_map (int rw, kvmd_t *vmd, size_t vaddr, size_t size, struct kiobuf **iobuf_out);
void kvmd_unmap (kvmd_t *vmd, struct kiobuf *iobuf);


#endif /*  __KERNEL__  */
#endif /*  __LINUX_KVMD_H__  */