#define _VIRTIO_PCI_H
#include "x86.h" // inl
-
-/* A 32-bit r/o bitmask of the features supported by the host */
-#define VIRTIO_PCI_HOST_FEATURES 0
-
-/* A 32-bit r/w bitmask of features activated by the guest */
-#define VIRTIO_PCI_GUEST_FEATURES 4
-
-/* A 32-bit r/w PFN for the currently selected queue */
-#define VIRTIO_PCI_QUEUE_PFN 8
-
-/* A 16-bit r/o queue size for the currently selected queue */
-#define VIRTIO_PCI_QUEUE_NUM 12
-
-/* A 16-bit r/w queue selector */
-#define VIRTIO_PCI_QUEUE_SEL 14
-
-/* A 16-bit r/w queue notifier */
-#define VIRTIO_PCI_QUEUE_NOTIFY 16
-
-/* An 8-bit device status register. */
-#define VIRTIO_PCI_STATUS 18
-
-/* An 8-bit r/o interrupt status register. Reading the value will return the
- * current contents of the ISR and will also clear it. This is effectively
- * a read-and-acknowledge. */
-#define VIRTIO_PCI_ISR 19
+#include "biosvar.h" // GET_LOWFLAT
/* The bit of the ISR which indicates a device configuration change. */
#define VIRTIO_PCI_ISR_CONFIG 0x2
-/* The remaining space is defined by each driver as the per-driver
- * configuration space */
-#define VIRTIO_PCI_CONFIG 20
-
/* Virtio ABI version, this must match exactly */
#define VIRTIO_PCI_ABI_VERSION 0
-static inline u32 vp_get_features(unsigned int ioaddr)
-{
- return inl(ioaddr + VIRTIO_PCI_HOST_FEATURES);
-}
-
-static inline void vp_set_features(unsigned int ioaddr, u32 features)
+/* --- virtio 0.9.5 (legacy) struct --------------------------------- */
+
+typedef struct virtio_pci_legacy {
+ u32 host_features;
+ u32 guest_features;
+ u32 queue_pfn;
+ u16 queue_num;
+ u16 queue_sel;
+ u16 queue_notify;
+ u8 status;
+ u8 isr;
+ u8 device[];
+} virtio_pci_legacy;
+
+/* --- virtio 1.0 (modern) structs ---------------------------------- */
+
+/* Common configuration */
+#define VIRTIO_PCI_CAP_COMMON_CFG 1
+/* Notifications */
+#define VIRTIO_PCI_CAP_NOTIFY_CFG 2
+/* ISR access */
+#define VIRTIO_PCI_CAP_ISR_CFG 3
+/* Device specific configuration */
+#define VIRTIO_PCI_CAP_DEVICE_CFG 4
+/* PCI configuration access */
+#define VIRTIO_PCI_CAP_PCI_CFG 5
+
+/* This is the PCI capability header: */
+struct virtio_pci_cap {
+ u8 cap_vndr; /* Generic PCI field: PCI_CAP_ID_VNDR */
+ u8 cap_next; /* Generic PCI field: next ptr. */
+ u8 cap_len; /* Generic PCI field: capability length */
+ u8 cfg_type; /* Identifies the structure. */
+ u8 bar; /* Where to find it. */
+ u8 padding[3]; /* Pad to full dword. */
+ u32 offset; /* Offset within bar. */
+ u32 length; /* Length of the structure, in bytes. */
+};
+
+struct virtio_pci_notify_cap {
+ struct virtio_pci_cap cap;
+ u32 notify_off_multiplier; /* Multiplier for queue_notify_off. */
+};
+
+typedef struct virtio_pci_common_cfg {
+ /* About the whole device. */
+ u32 device_feature_select; /* read-write */
+ u32 device_feature; /* read-only */
+ u32 guest_feature_select; /* read-write */
+ u32 guest_feature; /* read-write */
+ u16 msix_config; /* read-write */
+ u16 num_queues; /* read-only */
+ u8 device_status; /* read-write */
+ u8 config_generation; /* read-only */
+
+ /* About a specific virtqueue. */
+ u16 queue_select; /* read-write */
+ u16 queue_size; /* read-write, power of 2. */
+ u16 queue_msix_vector; /* read-write */
+ u16 queue_enable; /* read-write */
+ u16 queue_notify_off; /* read-only */
+ u32 queue_desc_lo; /* read-write */
+ u32 queue_desc_hi; /* read-write */
+ u32 queue_avail_lo; /* read-write */
+ u32 queue_avail_hi; /* read-write */
+ u32 queue_used_lo; /* read-write */
+ u32 queue_used_hi; /* read-write */
+} virtio_pci_common_cfg;
+
+typedef struct virtio_pci_isr {
+ u8 isr;
+} virtio_pci_isr;
+
+/* --- driver structs ----------------------------------------------- */
+
+struct vp_cap {
+ u32 addr;
+ u8 cap;
+ u8 bar;
+ u8 is_io;
+};
+
+struct vp_device {
+ struct vp_cap common, notify, isr, device, legacy;
+ u32 notify_off_multiplier;
+ u8 use_modern;
+};
+
+static inline u64 _vp_read(struct vp_cap *cap, u32 offset, u8 size)
{
- outl(features, ioaddr + VIRTIO_PCI_GUEST_FEATURES);
+ u32 addr = cap->addr + offset;
+ u64 var;
+
+ if (cap->is_io) {
+ switch (size) {
+ case 8:
+ var = inl(addr);
+ var |= (u64)inl(addr+4) << 32;
+ break;
+ case 4:
+ var = inl(addr);
+ break;
+ case 2:
+ var = inw(addr);
+ break;
+ case 1:
+ var = inb(addr);
+ break;
+ default:
+ var = 0;
+ }
+ } else {
+ switch (size) {
+ case 8:
+ var = readl((void*)addr);
+ var |= (u64)readl((void*)(addr+4)) << 32;
+ break;
+ case 4:
+ var = readl((void*)addr);
+ break;
+ case 2:
+ var = readw((void*)addr);
+ break;
+ case 1:
+ var = readb((void*)addr);
+ break;
+ default:
+ var = 0;
+ }
+ }
+ dprintf(9, "vp read %x (%d) -> 0x%llx\n", addr, size, var);
+ return var;
}
-static inline void vp_get(unsigned int ioaddr, unsigned offset,
- void *buf, unsigned len)
+static inline void _vp_write(struct vp_cap *cap, u32 offset, u8 size, u64 var)
{
- u8 *ptr = buf;
- unsigned i;
-
- for (i = 0; i < len; i++)
- ptr[i] = inb(ioaddr + VIRTIO_PCI_CONFIG + offset + i);
+ u32 addr = cap->addr + offset;
+
+ dprintf(9, "vp write %x (%d) <- 0x%llx\n", addr, size, var);
+ if (cap->is_io) {
+ switch (size) {
+ case 4:
+ outl(var, addr);
+ break;
+ case 2:
+ outw(var, addr);
+ break;
+ case 1:
+ outb(var, addr);
+ break;
+ }
+ } else {
+ switch (size) {
+ case 4:
+ writel((void*)addr, var);
+ break;
+ case 2:
+ writew((void*)addr, var);
+ break;
+ case 1:
+ writeb((void*)addr, var);
+ break;
+ }
+ }
}
-static inline u8 vp_get_status(unsigned int ioaddr)
-{
- return inb(ioaddr + VIRTIO_PCI_STATUS);
-}
+#define vp_read(_cap, _struct, _field) \
+ _vp_read(_cap, offsetof(_struct, _field), \
+ sizeof(((_struct *)0)->_field))
-static inline void vp_set_status(unsigned int ioaddr, u8 status)
-{
- if (status == 0) /* reset */
- return;
- outb(status, ioaddr + VIRTIO_PCI_STATUS);
-}
+#define vp_write(_cap, _struct, _field, _var) \
+ _vp_write(_cap, offsetof(_struct, _field), \
+ sizeof(((_struct *)0)->_field), _var)
-static inline u8 vp_get_isr(unsigned int ioaddr)
-{
- return inb(ioaddr + VIRTIO_PCI_ISR);
-}
+u64 vp_get_features(struct vp_device *vp);
+void vp_set_features(struct vp_device *vp, u64 features);
-static inline void vp_reset(unsigned int ioaddr)
+static inline void vp_get_legacy(struct vp_device *vp, unsigned offset,
+ void *buf, unsigned len)
{
- outb(0, ioaddr + VIRTIO_PCI_STATUS);
- (void)inb(ioaddr + VIRTIO_PCI_ISR);
-}
+ u8 *ptr = buf;
+ unsigned i;
-static inline void vp_notify(unsigned int ioaddr, int queue_index)
-{
- outw(queue_index, ioaddr + VIRTIO_PCI_QUEUE_NOTIFY);
+ for (i = 0; i < len; i++)
+ ptr[i] = vp_read(&vp->legacy, virtio_pci_legacy, device[i]);
}
-static inline void vp_del_vq(unsigned int ioaddr, int queue_index)
-{
- /* select the queue */
-
- outw(queue_index, ioaddr + VIRTIO_PCI_QUEUE_SEL);
-
- /* deactivate the queue */
-
- outl(0, ioaddr + VIRTIO_PCI_QUEUE_PFN);
-}
+u8 vp_get_status(struct vp_device *vp);
+void vp_set_status(struct vp_device *vp, u8 status);
+u8 vp_get_isr(struct vp_device *vp);
+void vp_reset(struct vp_device *vp);
+struct pci_device;
struct vring_virtqueue;
-u16 vp_init_simple(u16 bdf);
-int vp_find_vq(unsigned int ioaddr, int queue_index,
+void vp_init_simple(struct vp_device *vp, struct pci_device *pci);
+void vp_notify(struct vp_device *vp, struct vring_virtqueue *vq);
+int vp_find_vq(struct vp_device *vp, int queue_index,
struct vring_virtqueue **p_vq);
#endif /* _VIRTIO_PCI_H_ */
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