Introduce Virtio-loopback epsilon release:

Epsilon release introduces a new compatibility layer which make virtio-loopback
design to work with QEMU and rust-vmm vhost-user backend without require any
changes.

Signed-off-by: Timos Ampelikiotis <t.ampelikiotis@virtualopensystems.com>
Change-Id: I52e57563e08a7d0bdc002f8e928ee61ba0c53dd9

1 files changed, 152 insertions, 0 deletions

diff --git a/include/hw/isa/isa.h b/include/hw/isa/isa.h
new file mode 100644
index 000000000..d4417b34b
--- /dev/null
+++ b/include/hw/isa/isa.h
@@ -0,0 +1,152 @@
+#ifndef HW_ISA_H
+#define HW_ISA_H
+
+/* ISA bus */
+
+#include "exec/memory.h"
+#include "exec/ioport.h"
+#include "hw/qdev-core.h"
+#include "qom/object.h"
+
+#define ISA_NUM_IRQS 16
+
+#define TYPE_ISA_DEVICE "isa-device"
+OBJECT_DECLARE_TYPE(ISADevice, ISADeviceClass, ISA_DEVICE)
+
+#define TYPE_ISA_BUS "ISA"
+OBJECT_DECLARE_SIMPLE_TYPE(ISABus, ISA_BUS)
+
+#define TYPE_APPLE_SMC "isa-applesmc"
+#define APPLESMC_MAX_DATA_LENGTH       32
+#define APPLESMC_PROP_IO_BASE "iobase"
+
+static inline uint16_t applesmc_port(void)
+{
+    Object *obj = object_resolve_path_type("", TYPE_APPLE_SMC, NULL);
+
+    if (obj) {
+        return object_property_get_uint(obj, APPLESMC_PROP_IO_BASE, NULL);
+    }
+    return 0;
+}
+
+#define TYPE_ISADMA "isa-dma"
+
+typedef struct IsaDmaClass IsaDmaClass;
+DECLARE_CLASS_CHECKERS(IsaDmaClass, ISADMA,
+                       TYPE_ISADMA)
+#define ISADMA(obj) \
+    INTERFACE_CHECK(IsaDma, (obj), TYPE_ISADMA)
+
+typedef enum {
+    ISADMA_TRANSFER_VERIFY,
+    ISADMA_TRANSFER_READ,
+    ISADMA_TRANSFER_WRITE,
+    ISADMA_TRANSFER_ILLEGAL,
+} IsaDmaTransferMode;
+
+typedef int (*IsaDmaTransferHandler)(void *opaque, int nchan, int pos,
+                                     int size);
+
+struct IsaDmaClass {
+    InterfaceClass parent;
+
+    bool (*has_autoinitialization)(IsaDma *obj, int nchan);
+    int (*read_memory)(IsaDma *obj, int nchan, void *buf, int pos, int len);
+    int (*write_memory)(IsaDma *obj, int nchan, void *buf, int pos, int len);
+    void (*hold_DREQ)(IsaDma *obj, int nchan);
+    void (*release_DREQ)(IsaDma *obj, int nchan);
+    void (*schedule)(IsaDma *obj);
+    void (*register_channel)(IsaDma *obj, int nchan,
+                             IsaDmaTransferHandler transfer_handler,
+                             void *opaque);
+};
+
+struct ISADeviceClass {
+    DeviceClass parent_class;
+    void (*build_aml)(ISADevice *dev, Aml *scope);
+};
+
+struct ISABus {
+    /*< private >*/
+    BusState parent_obj;
+    /*< public >*/
+
+    MemoryRegion *address_space;
+    MemoryRegion *address_space_io;
+    qemu_irq *irqs;
+    IsaDma *dma[2];
+};
+
+struct ISADevice {
+    /*< private >*/
+    DeviceState parent_obj;
+    /*< public >*/
+
+    int8_t isairq[2];      /* -1 = unassigned */
+    int nirqs;
+    int ioport_id;
+};
+
+ISABus *isa_bus_new(DeviceState *dev, MemoryRegion *address_space,
+                    MemoryRegion *address_space_io, Error **errp);
+void isa_bus_irqs(ISABus *bus, qemu_irq *irqs);
+qemu_irq isa_get_irq(ISADevice *dev, unsigned isairq);
+void isa_init_irq(ISADevice *dev, qemu_irq *p, unsigned isairq);
+void isa_connect_gpio_out(ISADevice *isadev, int gpioirq, unsigned isairq);
+void isa_bus_dma(ISABus *bus, IsaDma *dma8, IsaDma *dma16);
+IsaDma *isa_get_dma(ISABus *bus, int nchan);
+MemoryRegion *isa_address_space(ISADevice *dev);
+MemoryRegion *isa_address_space_io(ISADevice *dev);
+ISADevice *isa_new(const char *name);
+ISADevice *isa_try_new(const char *name);
+bool isa_realize_and_unref(ISADevice *dev, ISABus *bus, Error **errp);
+ISADevice *isa_create_simple(ISABus *bus, const char *name);
+
+ISADevice *isa_vga_init(ISABus *bus);
+void isa_build_aml(ISABus *bus, Aml *scope);
+
+/**
+ * isa_register_ioport: Install an I/O port region on the ISA bus.
+ *
+ * Register an I/O port region via memory_region_add_subregion
+ * inside the ISA I/O address space.
+ *
+ * @dev: the ISADevice against which these are registered; may be NULL.
+ * @io: the #MemoryRegion being registered.
+ * @start: the base I/O port.
+ */
+void isa_register_ioport(ISADevice *dev, MemoryRegion *io, uint16_t start);
+
+/**
+ * isa_register_portio_list: Initialize a set of ISA io ports
+ *
+ * Several ISA devices have many dis-joint I/O ports.  Worse, these I/O
+ * ports can be interleaved with I/O ports from other devices.  This
+ * function makes it easy to create multiple MemoryRegions for a single
+ * device and use the legacy portio routines.
+ *
+ * @dev: the ISADevice against which these are registered; may be NULL.
+ * @piolist: the PortioList associated with the io ports
+ * @start: the base I/O port against which the portio->offset is applied.
+ * @portio: the ports, sorted by offset.
+ * @opaque: passed into the portio callbacks.
+ * @name: passed into memory_region_init_io.
+ *
+ * Returns: 0 on success, negative error code otherwise (e.g. if the
+ *          ISA bus is not available)
+ */
+int isa_register_portio_list(ISADevice *dev,
+                             PortioList *piolist,
+                             uint16_t start,
+                             const MemoryRegionPortio *portio,
+                             void *opaque, const char *name);
+
+static inline ISABus *isa_bus_from_device(ISADevice *d)
+{
+    return ISA_BUS(qdev_get_parent_bus(DEVICE(d)));
+}
+
+#define TYPE_PIIX4_PCI_DEVICE "piix4-isa"
+
+#endif