1 #ifndef _LINUX_LGUEST_LAUNCHER
2 #define _LINUX_LGUEST_LAUNCHER
3 /* Everything the "lguest" userspace program needs to know. */
4 #include <linux/types.h>
9 * The Guest needs devices to do anything useful. Since we don't let it touch
10 * real devices (think of the damage it could do!) we provide virtual devices.
11 * We could emulate a PCI bus with various devices on it, but that is a fairly
12 * complex burden for the Host and suboptimal for the Guest, so we have our own
13 * "lguest" bus and simple drivers.
15 * Devices are described by a simplified ID, a status byte, and some "config"
16 * bytes which describe this device's configuration. This is placed by the
17 * Launcher just above the top of physical memory:
19 struct lguest_device_desc {
20 /* The device type: console, network, disk etc. Type 0 terminates. */
22 /* The number of bytes of the config array. */
24 /* A status byte, written by the Guest. */
29 /*D:135 This is how we expect the device configuration field for a virtqueue
30 * (type VIRTIO_CONFIG_F_VIRTQUEUE) to be laid out: */
31 struct lguest_vqconfig {
32 /* The number of entries in the virtio_ring */
34 /* The interrupt we get when something happens. */
36 /* The page number of the virtio ring for this device. */
41 /* Write command first word is a request. */
44 LHREQ_INITIALIZE, /* + base, pfnlimit, pgdir, start */
45 LHREQ_GETDMA, /* No longer used */
46 LHREQ_IRQ, /* + irq */
47 LHREQ_BREAK, /* + on/off flag (on blocks until someone does off) */
49 #endif /* _LINUX_LGUEST_LAUNCHER */