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