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#ifndef _LINUX_LGUEST_LAUNCHER

#define _LINUX_LGUEST_LAUNCHER

/* Everything the "lguest" userspace program needs to know. */

#include <linux/types.h>

/*D:010

 * Drivers

 *

 * The Guest needs devices to do anything useful.  Since we don't let it touch

 * real devices (think of the damage it could do!) we provide virtual devices.

 * We could emulate a PCI bus with various devices on it, but that is a fairly

 * complex burden for the Host and suboptimal for the Guest, so we have our own

 * simple lguest bus and we use "virtio" drivers.  These drivers need a set of

 * routines from us which will actually do the virtual I/O, but they handle all

 * the net/block/console stuff themselves.  This means that if we want to add

 * a new device, we simply need to write a new virtio driver and create support

 * for it in the Launcher: this code won't need to change.

 *

 * Devices are described by a simplified ID, a status byte, and some "config"

 * bytes which describe this device's configuration.  This is placed by the

 * Launcher just above the top of physical memory:

 */

struct lguest_device_desc {

        /* The device type: console, network, disk etc.  Type 0 terminates. */

        __u8 type;

        /* The number of bytes of the config array. */

        __u8 config_len;

        /* A status byte, written by the Guest. */

        __u8 status;

        __u8 config[0];

};

/*D:135 This is how we expect the device configuration field for a virtqueue

 * (type VIRTIO_CONFIG_F_VIRTQUEUE) to be laid out: */

struct lguest_vqconfig {

        /* The number of entries in the virtio_ring */

        __u16 num;

        /* The interrupt we get when something happens. */

        __u16 irq;

        /* The page number of the virtio ring for this device. */

        __u32 pfn;

};

/*:*/

/* Write command first word is a request. */

enum lguest_req

{

        LHREQ_INITIALIZE, /* + base, pfnlimit, pgdir, start */

        LHREQ_GETDMA, /* No longer used */

        LHREQ_IRQ, /* + irq */

        LHREQ_BREAK, /* + on/off flag (on blocks until someone does off) */

};

#endif /* _LINUX_LGUEST_LAUNCHER */