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https://github.com/ipxe/ipxe
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8406115834
Access to the gpxe.org and etherboot.org domains and associated resources has been revoked by the registrant of the domain. Work around this problem by renaming project from gPXE to iPXE, and updating URLs to match. Also update README, LOG and COPYRIGHTS to remove obsolete information. Signed-off-by: Michael Brown <mcb30@ipxe.org>
65 lines
1.4 KiB
C
65 lines
1.4 KiB
C
/* virtio-pci.c - pci interface for virtio interface
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*
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* (c) Copyright 2008 Bull S.A.S.
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*
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* Author: Laurent Vivier <Laurent.Vivier@bull.net>
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*
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* some parts from Linux Virtio PCI driver
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*
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* Copyright IBM Corp. 2007
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* Authors: Anthony Liguori <aliguori@us.ibm.com>
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*
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*/
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#include "etherboot.h"
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#include "ipxe/io.h"
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#include "ipxe/virtio-ring.h"
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#include "ipxe/virtio-pci.h"
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int vp_find_vq(unsigned int ioaddr, int queue_index,
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struct vring_virtqueue *vq)
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{
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struct vring * vr = &vq->vring;
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u16 num;
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/* select the queue */
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outw(queue_index, ioaddr + VIRTIO_PCI_QUEUE_SEL);
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/* check if the queue is available */
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num = inw(ioaddr + VIRTIO_PCI_QUEUE_NUM);
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if (!num) {
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printf("ERROR: queue size is 0\n");
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return -1;
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}
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if (num > MAX_QUEUE_NUM) {
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printf("ERROR: queue size %d > %d\n", num, MAX_QUEUE_NUM);
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return -1;
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}
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/* check if the queue is already active */
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if (inl(ioaddr + VIRTIO_PCI_QUEUE_PFN)) {
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printf("ERROR: queue already active\n");
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return -1;
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}
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vq->queue_index = queue_index;
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/* initialize the queue */
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vring_init(vr, num, (unsigned char*)&vq->queue);
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/* activate the queue
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*
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* NOTE: vr->desc is initialized by vring_init()
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*/
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outl((unsigned long)virt_to_phys(vr->desc) >> PAGE_SHIFT,
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ioaddr + VIRTIO_PCI_QUEUE_PFN);
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return num;
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}
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