1 #ifndef _ASM_LGUEST_USER
2 #define _ASM_LGUEST_USER
3 /* Everything the "lguest" userspace program needs to know. */
4 #include <linux/types.h>
5 /* They can register up to 32 arrays of lguest_dma. */
6 #define LGUEST_MAX_DMA 32
7 /* At most we can dma 16 lguest_dma in one op. */
8 #define LGUEST_MAX_DMA_SECTIONS 16
10 /* How many devices? Assume each one wants up to two dma arrays per device. */
11 #define LGUEST_MAX_DEVICES (LGUEST_MAX_DMA/2)
13 /* Where the Host expects the Guest to SEND_DMA console output to. */
14 #define LGUEST_CONSOLE_DMA_KEY 0
19 * The Guest needs devices to do anything useful. Since we don't let it touch
20 * real devices (think of the damage it could do!) we provide virtual devices.
21 * We could emulate a PCI bus with various devices on it, but that is a fairly
22 * complex burden for the Host and suboptimal for the Guest, so we have our own
23 * "lguest" bus and simple drivers.
25 * Devices are described by a simplified ID, a status byte, and some "config"
26 * bytes which describe this device's configuration. This is placed by the
27 * Launcher just above the top of physical memory:
29 struct lguest_device_desc
{
30 /* The device type: console, network, disk etc. Type 0 terminates. */
32 /* The number of bytes of the config array. */
34 /* A status byte, written by the Guest. */
39 /*D:135 This is how we expect the device configuration field for a virtqueue
40 * (type VIRTIO_CONFIG_F_VIRTQUEUE) to be laid out: */
41 struct lguest_vqconfig
{
42 /* The number of entries in the virtio_ring */
44 /* The interrupt we get when something happens. */
46 /* The page number of the virtio ring for this device. */
51 /* Write command first word is a request. */
54 LHREQ_INITIALIZE
, /* + pfnlimit, pgdir, start, pageoffset */
55 LHREQ_GETDMA
, /* No longer used */
56 LHREQ_IRQ
, /* + irq */
57 LHREQ_BREAK
, /* + on/off flag (on blocks until someone does off) */
59 #endif /* _ASM_LGUEST_USER */
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