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Annotation of qemu/roms/seabios/src/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:  *  Adopted for Seabios: Gleb Natapov <[email protected]>
                     13:  *
                     14:  * This work is licensed under the terms of the GNU LGPLv3
                     15:  * See the COPYING file in the top-level directory.
                     16:  */
                     17: 
                     18: #include "virtio-ring.h"
                     19: #include "virtio-pci.h"
                     20: #include "config.h" // CONFIG_DEBUG_LEVEL
                     21: #include "util.h" // dprintf
                     22: 
                     23: int vp_find_vq(unsigned int ioaddr, int queue_index,
                     24:                struct vring_virtqueue *vq)
                     25: {
                     26:    struct vring * vr = &vq->vring;
                     27:    u16 num;
                     28: 
                     29:    ASSERT32FLAT();
                     30:    /* select the queue */
                     31: 
                     32:    outw(queue_index, ioaddr + VIRTIO_PCI_QUEUE_SEL);
                     33: 
                     34:    /* check if the queue is available */
                     35: 
                     36:    num = inw(ioaddr + VIRTIO_PCI_QUEUE_NUM);
                     37:    if (!num) {
                     38:        dprintf(1, "ERROR: queue size is 0\n");
                     39:        return -1;
                     40:    }
                     41: 
                     42:    if (num > MAX_QUEUE_NUM) {
                     43:        dprintf(1, "ERROR: queue size %d > %d\n", num, MAX_QUEUE_NUM);
                     44:        return -1;
                     45:    }
                     46: 
                     47:    /* check if the queue is already active */
                     48: 
                     49:    if (inl(ioaddr + VIRTIO_PCI_QUEUE_PFN)) {
                     50:        dprintf(1, "ERROR: queue already active\n");
                     51:        return -1;
                     52:    }
                     53: 
                     54:    vq->queue_index = queue_index;
                     55: 
                     56:    /* initialize the queue */
                     57: 
                     58:    vring_init(vr, num, (unsigned char*)&vq->queue);
                     59: 
                     60:    /* activate the queue
                     61:     *
                     62:     * NOTE: vr->desc is initialized by vring_init()
                     63:     */
                     64: 
                     65:    outl((unsigned long)virt_to_phys(vr->desc) >> PAGE_SHIFT,
                     66:         ioaddr + VIRTIO_PCI_QUEUE_PFN);
                     67: 
                     68:    return num;
                     69: }

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