diff options
| author | Anthony Liguori <aliguori@us.ibm.com> | 2007-11-12 21:30:26 -0600 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2008-02-04 23:50:11 +1100 |
| commit | 3343660d8c62c6b00b2f15324ef3fcb6be207bfa (patch) | |
| tree | 06d86446da65fc1814edad944e43aeb62f092422 /include/linux/virtio_pci.h | |
| parent | d50ed907dc3db5bf2dd0a05b4e199a65793a3788 (diff) | |
virtio: PCI device
This is a PCI device that implements a transport for virtio. It allows virtio
devices to be used by QEMU based VMMs like KVM or Xen.
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'include/linux/virtio_pci.h')
| -rw-r--r-- | include/linux/virtio_pci.h | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/include/linux/virtio_pci.h b/include/linux/virtio_pci.h new file mode 100644 index 000000000000..860eb37bfa07 --- /dev/null +++ b/include/linux/virtio_pci.h @@ -0,0 +1,55 @@ +/* + * Virtio PCI driver + * + * This module allows virtio devices to be used over a virtual PCI device. + * This can be used with QEMU based VMMs like KVM or Xen. + * + * Copyright IBM Corp. 2007 + * + * Authors: + * Anthony Liguori <aliguori@us.ibm.com> + * + * This work is licensed under the terms of the GNU GPL, version 2 or later. + * See the COPYING file in the top-level directory. + * + */ + +#ifndef _LINUX_VIRTIO_PCI_H +#define _LINUX_VIRTIO_PCI_H + +#include <linux/virtio_config.h> + +/* A 32-bit r/o bitmask of the features supported by the host */ +#define VIRTIO_PCI_HOST_FEATURES 0 + +/* A 32-bit r/w bitmask of features activated by the guest */ +#define VIRTIO_PCI_GUEST_FEATURES 4 + +/* A 32-bit r/w PFN for the currently selected queue */ +#define VIRTIO_PCI_QUEUE_PFN 8 + +/* A 16-bit r/o queue size for the currently selected queue */ +#define VIRTIO_PCI_QUEUE_NUM 12 + +/* A 16-bit r/w queue selector */ +#define VIRTIO_PCI_QUEUE_SEL 14 + +/* A 16-bit r/w queue notifier */ +#define VIRTIO_PCI_QUEUE_NOTIFY 16 + +/* An 8-bit device status register. */ +#define VIRTIO_PCI_STATUS 18 + +/* An 8-bit r/o interrupt status register. Reading the value will return the + * current contents of the ISR and will also clear it. This is effectively + * a read-and-acknowledge. */ +#define VIRTIO_PCI_ISR 19 + +/* The bit of the ISR which indicates a device configuration change. */ +#define VIRTIO_PCI_ISR_CONFIG 0x2 + +/* The remaining space is defined by each driver as the per-driver + * configuration space */ +#define VIRTIO_PCI_CONFIG 20 + +#endif |