Add struct to represent UART port syscall data

src/vm.rs

@@ -119,6 +119,10 @@ pub trait VirtualCPU {
 					Hypercall::Cmdval(syscmdval)
 				}
 				HypercallAddress::Uart => Hypercall::SerialWriteByte(data as u8),
+				HypercallAddress::SerialWriteBuffer => {
+					let syscmdval = unsafe { &*(self.host_address(data) as *const SerialWriteBufferParams) };
+					Hypercall::SerialWriteBuffer(syscmdval)
+				}
 				_ => unimplemented!(),
 			})
 		} else {

uhyve-interface/src/lib.rs

@@ -57,6 +57,8 @@ pub enum HypercallAddress {
 	Uart = 0x800,
 	/// Port address = `0x840`
 	FileUnlink = 0x840,
+	/// Port address = `0x880`
+	SerialBufferWrite = 0x880,
 }
 impl From<Hypercall<'_>> for HypercallAddress {
 	fn from(value: Hypercall) -> Self {
@@ -71,6 +73,7 @@ impl From<Hypercall<'_>> for HypercallAddress {
 			Hypercall::FileWrite(_) => Self::FileWrite,
 			Hypercall::FileUnlink(_) => Self::FileUnlink,
 			Hypercall::SerialWriteByte(_) => Self::Uart,
+			Hypercall::SerialWriteBuffer(_) => Self::SerialBufferWrite,
 		}
 	}
 }
@@ -95,6 +98,8 @@ pub enum Hypercall<'a> {
 	FileUnlink(&'a mut UnlinkParams),
 	/// Write a char to the terminal.
 	SerialWriteByte(u8),
+	/// Write a buffer to the terminal.
+	SerialWriteBuffer(&'a SerialWriteBufferParams),
 }
 impl<'a> Hypercall<'a> {
 	/// Get a hypercall's port address.

uhyve-interface/src/parameters.rs

@@ -107,3 +107,11 @@ pub struct LseekParams {
 	/// `whence` value of the lseek call.
 	pub whence: i32,
 }
+
+/// Parameters for a [`SerialWriteBuffer`](crate::Hypercall::SerialWriteBuffer) hypercall.
+#[repr(C, packed)]
+#[derive(Debug, Copy, Clone)]
+pub struct SerialWriteBufferParams {
+	buf: PhysAddr,
+	len: usize,
+}