1 #ifndef _VIRTIO_PCI_H_ 2 # define _VIRTIO_PCI_H_ 3 4 /* A 32-bit r/o bitmask of the features supported by the host */ 5 #define VIRTIO_PCI_HOST_FEATURES 0 6 7 /* A 32-bit r/w bitmask of features activated by the guest */ 8 #define VIRTIO_PCI_GUEST_FEATURES 4 9 10 /* A 32-bit r/w PFN for the currently selected queue */ 11 #define VIRTIO_PCI_QUEUE_PFN 8 12 13 /* A 16-bit r/o queue size for the currently selected queue */ 14 #define VIRTIO_PCI_QUEUE_NUM 12 15 16 /* A 16-bit r/w queue selector */ 17 #define VIRTIO_PCI_QUEUE_SEL 14 18 19 /* A 16-bit r/w queue notifier */ 20 #define VIRTIO_PCI_QUEUE_NOTIFY 16 21 22 /* An 8-bit device status register. */ 23 #define VIRTIO_PCI_STATUS 18 24 25 /* An 8-bit r/o interrupt status register. Reading the value will return the 26 * current contents of the ISR and will also clear it. This is effectively 27 * a read-and-acknowledge. */ 28 #define VIRTIO_PCI_ISR 19 29 30 /* The bit of the ISR which indicates a device configuration change. */ 31 #define VIRTIO_PCI_ISR_CONFIG 0x2 32 33 /* The remaining space is defined by each driver as the per-driver 34 * configuration space */ 35 #define VIRTIO_PCI_CONFIG 20 36 37 /* Virtio ABI version, this must match exactly */ 38 #define VIRTIO_PCI_ABI_VERSION 0 39 40 static inline u32 vp_get_features(unsigned int ioaddr) 41 { 42 return inl(ioaddr + VIRTIO_PCI_HOST_FEATURES); 43 } 44 45 static inline void vp_set_features(unsigned int ioaddr, u32 features) 46 { 47 outl(features, ioaddr + VIRTIO_PCI_GUEST_FEATURES); 48 } 49 50 static inline void vp_get(unsigned int ioaddr, unsigned offset, 51 void *buf, unsigned len) 52 { 53 u8 *ptr = buf; 54 unsigned i; 55 56 for (i = 0; i < len; i++) 57 ptr[i] = inb(ioaddr + VIRTIO_PCI_CONFIG + offset + i); 58 } 59 60 static inline u8 vp_get_status(unsigned int ioaddr) 61 { 62 return inb(ioaddr + VIRTIO_PCI_STATUS); 63 } 64 65 static inline void vp_set_status(unsigned int ioaddr, u8 status) 66 { 67 if (status == 0) /* reset */ 68 return; 69 outb(status, ioaddr + VIRTIO_PCI_STATUS); 70 } 71 72 73 static inline void vp_reset(unsigned int ioaddr) 74 { 75 outb(0, ioaddr + VIRTIO_PCI_STATUS); 76 (void)inb(ioaddr + VIRTIO_PCI_ISR); 77 } 78 79 static inline void vp_notify(unsigned int ioaddr, int queue_index) 80 { 81 outw(queue_index, ioaddr + VIRTIO_PCI_QUEUE_NOTIFY); 82 } 83 84 static inline void vp_del_vq(unsigned int ioaddr, int queue_index) 85 { 86 /* select the queue */ 87 88 outw(queue_index, ioaddr + VIRTIO_PCI_QUEUE_SEL); 89 90 /* deactivate the queue */ 91 92 outl(0, ioaddr + VIRTIO_PCI_QUEUE_PFN); 93 } 94 95 int vp_find_vq(unsigned int ioaddr, int queue_index, 96 struct vring_virtqueue *vq); 97 #endif /* _VIRTIO_PCI_H_ */ 98
