| #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 |
| * "lguest" bus and simple drivers. |
| * |
| * 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 */ |