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Vectored IO APIs will require some sort of vector argument. It makes sense to use struct iovec and just define it globally for Windows. Signed-off-by: Anthony Liguori <aliguori@us.ibm.com> git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5889 c046a42c-6fe2-441c-8c8c-71466251a162
127 lines
3.8 KiB
C
127 lines
3.8 KiB
C
/*
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* Virtio Support
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*
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* Copyright IBM, Corp. 2007
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#ifndef _QEMU_VIRTIO_H
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#define _QEMU_VIRTIO_H
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#include "hw.h"
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#include "pci.h"
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/* from Linux's linux/virtio_config.h */
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/* Status byte for guest to report progress, and synchronize features. */
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/* We have seen device and processed generic fields (VIRTIO_CONFIG_F_VIRTIO) */
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#define VIRTIO_CONFIG_S_ACKNOWLEDGE 1
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/* We have found a driver for the device. */
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#define VIRTIO_CONFIG_S_DRIVER 2
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/* Driver has used its parts of the config, and is happy */
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#define VIRTIO_CONFIG_S_DRIVER_OK 4
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/* We've given up on this device. */
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#define VIRTIO_CONFIG_S_FAILED 0x80
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/* We notify when the ring is completely used, even if the guest is supressing
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* callbacks */
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#define VIRTIO_F_NOTIFY_ON_EMPTY 24
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/* from Linux's linux/virtio_ring.h */
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/* This marks a buffer as continuing via the next field. */
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#define VRING_DESC_F_NEXT 1
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/* This marks a buffer as write-only (otherwise read-only). */
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#define VRING_DESC_F_WRITE 2
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/* This means don't notify other side when buffer added. */
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#define VRING_USED_F_NO_NOTIFY 1
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/* This means don't interrupt guest when buffer consumed. */
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#define VRING_AVAIL_F_NO_INTERRUPT 1
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struct VirtQueue;
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static inline target_phys_addr_t vring_align(target_phys_addr_t addr,
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unsigned long align)
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{
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return (addr + align - 1) & ~(align - 1);
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}
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typedef struct VirtQueue VirtQueue;
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typedef struct VirtIODevice VirtIODevice;
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#define VIRTQUEUE_MAX_SIZE 1024
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typedef struct VirtQueueElement
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{
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unsigned int index;
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unsigned int out_num;
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unsigned int in_num;
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target_phys_addr_t in_addr[VIRTQUEUE_MAX_SIZE];
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struct iovec in_sg[VIRTQUEUE_MAX_SIZE];
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struct iovec out_sg[VIRTQUEUE_MAX_SIZE];
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} VirtQueueElement;
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#define VIRTIO_PCI_QUEUE_MAX 16
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struct VirtIODevice
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{
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PCIDevice pci_dev;
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const char *name;
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uint32_t addr;
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uint8_t status;
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uint8_t isr;
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uint16_t queue_sel;
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uint32_t features;
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size_t config_len;
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void *config;
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uint32_t (*get_features)(VirtIODevice *vdev);
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void (*set_features)(VirtIODevice *vdev, uint32_t val);
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void (*get_config)(VirtIODevice *vdev, uint8_t *config);
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void (*set_config)(VirtIODevice *vdev, const uint8_t *config);
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void (*reset)(VirtIODevice *vdev);
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VirtQueue *vq;
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};
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VirtIODevice *virtio_init_pci(PCIBus *bus, const char *name,
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uint16_t vendor, uint16_t device,
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uint16_t subvendor, uint16_t subdevice,
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uint8_t class_code, uint8_t subclass_code,
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uint8_t pif, size_t config_size,
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size_t struct_size);
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VirtQueue *virtio_add_queue(VirtIODevice *vdev, int queue_size,
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void (*handle_output)(VirtIODevice *,
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VirtQueue *));
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void virtqueue_push(VirtQueue *vq, const VirtQueueElement *elem,
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unsigned int len);
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void virtqueue_flush(VirtQueue *vq, unsigned int count);
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void virtqueue_fill(VirtQueue *vq, const VirtQueueElement *elem,
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unsigned int len, unsigned int idx);
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int virtqueue_pop(VirtQueue *vq, VirtQueueElement *elem);
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int virtqueue_avail_bytes(VirtQueue *vq, int in_bytes, int out_bytes);
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void virtio_notify(VirtIODevice *vdev, VirtQueue *vq);
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void virtio_save(VirtIODevice *vdev, QEMUFile *f);
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void virtio_load(VirtIODevice *vdev, QEMUFile *f);
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void virtio_notify_config(VirtIODevice *vdev);
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void virtio_queue_set_notification(VirtQueue *vq, int enable);
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int virtio_queue_ready(VirtQueue *vq);
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int virtio_queue_empty(VirtQueue *vq);
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#endif
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