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/* virtio-pci.c - pci interface for virtio interface
*
* (c) Copyright 2008 Bull S.A.S.
*
* Author: Laurent Vivier <Laurent.Vivier@bull.net>
*
* some parts from Linux Virtio PCI driver
*
* Copyright IBM Corp. 2007
* Authors: Anthony Liguori <aliguori@us.ibm.com>
*
*/
#include "etherboot.h"
#include "gpxe/io.h"
#include "gpxe/virtio-ring.h"
#include "gpxe/virtio-pci.h"
int vp_find_vq(unsigned int ioaddr, int queue_index,
struct vring_virtqueue *vq)
{
struct vring * vr = &vq->vring;
u16 num;
/* select the queue */
outw(queue_index, ioaddr + VIRTIO_PCI_QUEUE_SEL);
/* check if the queue is available */
num = inw(ioaddr + VIRTIO_PCI_QUEUE_NUM);
if (!num) {
printf("ERROR: queue size is 0\n");
return -1;
}
if (num > MAX_QUEUE_NUM) {
printf("ERROR: queue size %d > %d\n", num, MAX_QUEUE_NUM);
return -1;
}
/* check if the queue is already active */
if (inl(ioaddr + VIRTIO_PCI_QUEUE_PFN)) {
printf("ERROR: queue already active\n");
return -1;
}
vq->queue_index = queue_index;
/* initialize the queue */
vring_init(vr, num, (unsigned char*)&vq->queue);
/* activate the queue
*
* NOTE: vr->desc is initialized by vring_init()
*/
outl((unsigned long)virt_to_phys(vr->desc) >> PAGE_SHIFT,
ioaddr + VIRTIO_PCI_QUEUE_PFN);
return num;
}
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