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35 #include "virtio_pci.h"
36 #include "virtio_logs.h"
38 static uint8_t vtpci_get_status(struct virtio_hw *);
41 vtpci_read_dev_config(struct virtio_hw *hw, uint64_t offset,
42 void *dst, int length)
48 off = VIRTIO_PCI_CONFIG(hw) + offset;
49 for (d = dst; length > 0; d += size, off += size, length -= size) {
52 *(uint32_t *)d = VIRTIO_READ_REG_4(hw, off);
53 } else if (length >= 2) {
55 *(uint16_t *)d = VIRTIO_READ_REG_2(hw, off);
58 *d = VIRTIO_READ_REG_1(hw, off);
64 vtpci_write_dev_config(struct virtio_hw *hw, uint64_t offset,
65 void *src, int length)
71 off = VIRTIO_PCI_CONFIG(hw) + offset;
72 for (s = src; length > 0; s += size, off += size, length -= size) {
75 VIRTIO_WRITE_REG_4(hw, off, *(uint32_t *)s);
76 } else if (length >= 2) {
78 VIRTIO_WRITE_REG_2(hw, off, *(uint16_t *)s);
81 VIRTIO_WRITE_REG_1(hw, off, *s);
87 vtpci_negotiate_features(struct virtio_hw *hw, uint32_t host_features)
91 * Limit negotiated features to what the driver, virtqueue, and
94 features = host_features & hw->guest_features;
96 VIRTIO_WRITE_REG_4(hw, VIRTIO_PCI_GUEST_FEATURES, features);
102 vtpci_reset(struct virtio_hw *hw)
105 * Setting the status to RESET sets the host device to
106 * the original, uninitialized state.
108 vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_RESET);
109 vtpci_get_status(hw);
113 vtpci_reinit_complete(struct virtio_hw *hw)
115 vtpci_set_status(hw, VIRTIO_CONFIG_STATUS_DRIVER_OK);
119 vtpci_get_status(struct virtio_hw *hw)
121 return VIRTIO_READ_REG_1(hw, VIRTIO_PCI_STATUS);
125 vtpci_set_status(struct virtio_hw *hw, uint8_t status)
127 if (status != VIRTIO_CONFIG_STATUS_RESET)
128 status = (uint8_t)(status | vtpci_get_status(hw));
130 VIRTIO_WRITE_REG_1(hw, VIRTIO_PCI_STATUS, status);
134 vtpci_isr(struct virtio_hw *hw)
137 return VIRTIO_READ_REG_1(hw, VIRTIO_PCI_ISR);
141 /* Enable one vector (0) for Link State Intrerrupt */
143 vtpci_irq_config(struct virtio_hw *hw, uint16_t vec)
145 VIRTIO_WRITE_REG_2(hw, VIRTIO_MSI_CONFIG_VECTOR, vec);
146 return VIRTIO_READ_REG_2(hw, VIRTIO_MSI_CONFIG_VECTOR);