feat(virtio-spec): add mmio::InterruptStatus

Signed-off-by: Martin Kröning <[email protected]>

virtio-spec/src/mmio.rs

@@ -272,19 +272,10 @@ device_register_impl! {
         ///
         /// Reading from this register returns a bit mask of events that
         /// caused the device interrupt to be asserted.
-        /// The following events are possible:
-        ///
-        /// - Used Buffer Notification
-        ///     - bit 0 - the interrupt was asserted
-        ///     because the device has used a buffer
-        ///     in at least one of the active virtual queues.
-        /// - Configuration Change Notification
-        ///     - bit 1 - the interrupt was
-        ///     asserted because the configuration of the device has changed.
         #[doc(alias = "InterruptStatus")]
         #[offset(0x060)]
         #[access(ReadOnly)]
-        interrupt_status: le32,
+        interrupt_status: InterruptStatus,
 
         /// Interrupt acknowledge
         ///
@@ -294,7 +285,7 @@ device_register_impl! {
         #[doc(alias = "InterruptACK")]
         #[offset(0x064)]
         #[access(WriteOnly)]
-        interrupt_ack: le32,
+        interrupt_ack: InterruptStatus,
 
         /// Device status
         ///
@@ -528,3 +519,18 @@ impl_wide_field_access! {
         shm_base: shm_base_low, shm_base_high;
     }
 }
+
+virtio_bitflags! {
+    /// Interrupt Status
+    pub struct InterruptStatus: u8 {
+        /// Used Buffer Notification
+        ///
+        /// The interrupt was asserted because the device has used a buffer in at least one of the active virtual queues.
+        const USED_BUFFER_NOTIFICATION = 1 << 0;
+
+        /// Configuration Change Notification
+        ///
+        /// The interrupt was asserted because the configuration of the device has changed.
+        const CONFIGURATION_CHANGE_NOTIFICATION = 1 << 1;
+    }
+}

virtio-spec/src/volatile.rs

@@ -5,6 +5,7 @@ use core::marker::PhantomData;
 use volatile::access::{Readable, Writable};
 use volatile::VolatilePtr;
 
+use crate::mmio::InterruptStatus;
 use crate::{be32, be64, le16, le32, le64, DeviceStatus};
 
 /// A wide volatile pointer for 64-bit fields.
@@ -272,7 +273,18 @@ impl OveralignedField<le32> for DeviceStatus {
     }
 }
 
+impl OveralignedField<le32> for InterruptStatus {
+    fn from_field(field: le32) -> Self {
+        Self::from_bits_retain(u8::from_field(field))
+    }
+
+    fn into_field(self) -> le32 {
+        self.bits().into_field()
+    }
+}
+
 mod private {
+    use crate::mmio::InterruptStatus;
     use crate::{le16, le32, DeviceStatus};
 
     pub trait Sealed<T> {}
@@ -281,4 +293,5 @@ mod private {
     impl Sealed<le32> for u8 {}
     impl Sealed<le32> for le16 {}
     impl Sealed<le32> for DeviceStatus {}
+    impl Sealed<le32> for InterruptStatus {}
 }