feat: support NACL extension

Signed-off-by: hwk2077 <[email protected]>

CHANGELOG.md

@@ -9,6 +9,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 ### Added
 
 - Support to PMU events in Chapter 11
+- Support `NACL` extension in Chapter 15
 
 ### Modified
 

src/lib.rs

@@ -42,6 +42,8 @@ pub mod dbcn;
 pub mod susp;
 // §14
 pub mod cppc;
+// §15
+pub mod nacl;
 
 /// Converts SBI EID from str.
 const fn eid_from_str(name: &str) -> i32 {
@@ -268,4 +270,20 @@ mod tests {
         const_assert_eq!(2, READ_HI);
         const_assert_eq!(3, WRITE);
     }
+    // §15
+    #[test]
+    fn test_nacl() {
+        use crate::nacl::*;
+        const_assert_eq!(0x4E41434C, EID_NACL);
+        const_assert_eq!(0, PROBE_FEATURE);
+        const_assert_eq!(1, SET_SHMEM);
+        const_assert_eq!(2, SYNC_CSR);
+        const_assert_eq!(3, SYNC_HFENCE);
+        const_assert_eq!(4, SYNC_SRET);
+
+        const_assert_eq!(0, feature_id::SYNC_CSR);
+        const_assert_eq!(1, feature_id::SYNC_HFENCE);
+        const_assert_eq!(2, feature_id::SYNC_SRET);
+        const_assert_eq!(3, feature_id::AUTOSWAP_CSR);
+    }
 }

src/nacl.rs

@@ -0,0 +1,51 @@
+//! Chapter 15. Nested Acceleration Extension (EID #0x4E41434C "NACL")
+
+/// Extension ID for Nested Acceleration Extension.
+pub const EID_NACL: usize = crate::eid_from_str("NACL") as _;
+pub use fid::*;
+
+/// Declared in § 15.15.
+mod fid {
+    /// Function ID to probe a nested acceleration feature.
+    ///
+    /// Declared in §15.5.
+    pub const PROBE_FEATURE: usize = 0;
+    /// Function ID to set and enable the shared memory for nested acceleration on the calling hart.
+    ///
+    /// Declared in §15.6.
+    pub const SET_SHMEM: usize = 1;
+    /// Function ID to synchronize CSRs in the nested acceleration shared memory.
+    ///
+    /// Declared in §15.7.
+    pub const SYNC_CSR: usize = 2;
+    /// Function ID to synchronize HFENCEs in the nested acceleration shared memory.
+    ///
+    /// Declared in §15.8.
+    pub const SYNC_HFENCE: usize = 3;
+    /// Function ID to synchronize CSRs and HFENCEs in the nested acceleration shared memory and emulate the SRET instruction.
+    ///
+    /// Declared in §15.9.
+    pub const SYNC_SRET: usize = 4;
+}
+
+/// Nested Acceleration Feature ID.
+///
+/// Declared in §15.
+pub mod feature_id {
+    /// Feature ID for the synchronize CSR feature.
+    ///
+    /// Declared in §15.1.
+    pub const SYNC_CSR: usize = 0;
+    /// Feature ID for the synchronize HFENCE feature.
+    ///
+    /// Declared in §15.2.
+    pub const SYNC_HFENCE: usize = 1;
+    /// Feature ID for the synchronize SRET feature.
+    ///
+    /// Declared in §15.3.
+    pub const SYNC_SRET: usize = 2;
+    /// Feature ID for the autoswap CSR feature.
+    ///
+    /// Declared in §15.4.
+    pub const AUTOSWAP_CSR: usize = 3;
+}