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Annotation of qemu/roms/ipxe/src/drivers/bus/virtio-pci.c, revision 1.1.1.1

1.1       root        1: /* virtio-pci.c - pci interface for virtio interface
                      2:  *
                      3:  * (c) Copyright 2008 Bull S.A.S.
                      4:  *
                      5:  *  Author: Laurent Vivier <[email protected]>
                      6:  *
                      7:  * some parts from Linux Virtio PCI driver
                      8:  *
                      9:  *  Copyright IBM Corp. 2007
                     10:  *  Authors: Anthony Liguori  <[email protected]>
                     11:  *
                     12:  */
                     13: 
                     14: #include "etherboot.h"
                     15: #include "ipxe/io.h"
                     16: #include "ipxe/virtio-ring.h"
                     17: #include "ipxe/virtio-pci.h"
                     18: 
                     19: int vp_find_vq(unsigned int ioaddr, int queue_index,
                     20:                struct vring_virtqueue *vq)
                     21: {
                     22:    struct vring * vr = &vq->vring;
                     23:    u16 num;
                     24: 
                     25:    /* select the queue */
                     26: 
                     27:    outw(queue_index, ioaddr + VIRTIO_PCI_QUEUE_SEL);
                     28: 
                     29:    /* check if the queue is available */
                     30: 
                     31:    num = inw(ioaddr + VIRTIO_PCI_QUEUE_NUM);
                     32:    if (!num) {
                     33:            printf("ERROR: queue size is 0\n");
                     34:            return -1;
                     35:    }
                     36: 
                     37:    if (num > MAX_QUEUE_NUM) {
                     38:            printf("ERROR: queue size %d > %d\n", num, MAX_QUEUE_NUM);
                     39:            return -1;
                     40:    }
                     41: 
                     42:    /* check if the queue is already active */
                     43: 
                     44:    if (inl(ioaddr + VIRTIO_PCI_QUEUE_PFN)) {
                     45:            printf("ERROR: queue already active\n");
                     46:            return -1;
                     47:    }
                     48: 
                     49:    vq->queue_index = queue_index;
                     50: 
                     51:    /* initialize the queue */
                     52: 
                     53:    vring_init(vr, num, (unsigned char*)&vq->queue);
                     54: 
                     55:    /* activate the queue
                     56:     *
                     57:     * NOTE: vr->desc is initialized by vring_init()
                     58:     */
                     59: 
                     60:    outl((unsigned long)virt_to_phys(vr->desc) >> PAGE_SHIFT,
                     61:         ioaddr + VIRTIO_PCI_QUEUE_PFN);
                     62: 
                     63:    return num;
                     64: }

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