[Bebop][RushB] Decouple runtime from Verilator

src/nodes/lib/rushB/src/lib.rs

@@ -1,4 +1,10 @@
-//! Shared Rust contract for the backend-neutral rushB host ABI.
+//! Backend-neutral rushB protocol and runtime.
+
+mod protocol;
+mod runtime;
+
+pub use protocol::{CommandId, DmaChunk, DmaOperation, RushCommand, RushEvent, RushEventKind, RushResponse, WaitMode};
+pub use runtime::{RushBackend, RushMessage, RushRequest, RushRuntime};
 
 pub const FUNCT7_FENCE: u32 = 0;
 pub const FUNCT7_MVOUT: u32 = 16;

src/nodes/lib/rushB/src/protocol.rs

@@ -0,0 +1,52 @@
+pub type CommandId = u64;
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub struct RushCommand {
+    pub id: CommandId,
+    pub core_id: u32,
+    pub xs1: u64,
+    pub xs2: u64,
+    pub funct7: u32,
+}
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub enum WaitMode {
+    Accepted,
+    Completed,
+}
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub enum RushEventKind {
+    Accepted,
+    Completed,
+}
+
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub struct RushEvent {
+    pub command_id: CommandId,
+    pub core_id: u32,
+    pub kind: RushEventKind,
+}
+
+#[derive(Clone, Debug, Eq, PartialEq)]
+pub struct DmaChunk {
+    pub offset: usize,
+    pub data: Vec<u8>,
+}
+
+#[derive(Debug)]
+pub enum DmaOperation {
+    None,
+    Mvin {
+        spans: Vec<(usize, usize)>,
+        chunks: Vec<DmaChunk>,
+    },
+    Mvout {
+        spans: Vec<(usize, usize)>,
+    },
+}
+
+#[derive(Clone, Debug, Default, Eq, PartialEq)]
+pub struct RushResponse {
+    pub output: Vec<DmaChunk>,
+}