4 * Copyright(c) 2010-2014 Intel Corporation. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * * Neither the name of Intel Corporation nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
24 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
25 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
27 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
35 #include "virtio_pci.h"
36 #include "virtio_logs.h"
39 vtpci_read_dev_config(struct virtio_hw *hw, uint64_t offset,
40 void *dst, int length)
46 off = VIRTIO_PCI_CONFIG(hw) + offset;
47 for (d = dst; length > 0; d += size, off += size, length -= size) {
50 *(uint32_t *)d = VIRTIO_READ_REG_4(hw, off);
51 } else if (length >= 2) {
53 *(uint16_t *)d = VIRTIO_READ_REG_2(hw, off);
56 *d = VIRTIO_READ_REG_1(hw, off);
62 vtpci_write_dev_config(struct virtio_hw *hw, uint64_t offset,
63 void *src, int length)
69 off = VIRTIO_PCI_CONFIG(hw) + offset;
70 for (s = src; length > 0; s += size, off += size, length -= size) {
73 VIRTIO_WRITE_REG_4(hw, off, *(uint32_t *)s);
74 } else if (length >= 2) {
76 VIRTIO_WRITE_REG_2(hw, off, *(uint16_t *)s);
79 VIRTIO_WRITE_REG_1(hw, off, *s);
85 vtpci_negotiate_features(struct virtio_hw *hw, uint32_t host_features)
89 * Limit negotiated features to what the driver, virtqueue, and
92 features = host_features & hw->guest_features;
94 VIRTIO_WRITE_REG_4(hw, VIRTIO_PCI_GUEST_FEATURES, features);
100 vtpci_reset(struct virtio_hw *hw)
103 * Setting the status to RESET sets the host device to
104 * the original, uninitialized state.
106 vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_RESET);
107 vtpci_get_status(hw);
111 vtpci_reinit_complete(struct virtio_hw *hw)
113 vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER_OK);
117 vtpci_get_status(struct virtio_hw *hw)
119 return VIRTIO_READ_REG_1(hw, VIRTIO_PCI_STATUS);
123 vtpci_set_status(struct virtio_hw *hw, uint8_t status)
125 if (status != VIRTIO_CONFIG_STATUS_RESET)
126 status = (uint8_t)(status | vtpci_get_status(hw));
128 VIRTIO_WRITE_REG_1(hw, VIRTIO_PCI_STATUS, status);