[Denali] Reset HBA and iterate over ports.

rust/lib/mammoth/src/port.rs

@@ -13,6 +13,10 @@ impl PortServer {
         })
     }
 
+    pub fn from_cap(port_cap: Capability) -> Self {
+        Self { port_cap }
+    }
+
     pub fn create_client_cap(&self) -> Result<z_cap_t, ZError> {
         self.port_cap
             .duplicate(!kZionPerm_Read)

rust/lib/mammoth/src/syscall.rs

@@ -295,6 +295,18 @@ pub fn port_poll(
     Ok((num_bytes, num_caps))
 }
 
+pub fn register_irq(irq_num: u64) -> Result<Capability, ZError> {
+    let mut port_cap: z_cap_t = 0;
+    syscall(
+        zion::kZionIrqRegister,
+        &zion::ZIrqRegisterReq {
+            irq_num,
+            port_cap: &mut port_cap,
+        },
+    )?;
+    Ok(Capability::take(port_cap))
+}
+
 pub fn endpoint_create() -> Result<Capability, ZError> {
     let mut endpoint_cap: z_cap_t = 0;
     syscall(