Refactoring: use new macros for M-mode CSRs

src/register/macros.rs

@@ -17,6 +17,25 @@ macro_rules! read_csr {
     };
 }
 
+macro_rules! read_csr_rv32 {
+    ($csr_number:expr) => {
+        /// Reads the CSR
+        #[inline]
+        #[cfg(target_arch = "riscv32")]
+        unsafe fn _read() -> usize {
+            let r: usize;
+            asm!("csrrs $0, $1, x0" : "=r"(r) : "i"($csr_number) :: "volatile");
+            r
+        }
+
+        #[inline]
+        #[cfg(not(target_arch = "riscv32"))]
+        unsafe fn _read() -> usize {
+            unimplemented!()
+        }
+    };
+}
+
 macro_rules! read_csr_as {
     ($register:ident, $csr_number:expr) => {
         read_csr!($csr_number);
@@ -28,6 +47,7 @@ macro_rules! read_csr_as {
         }
     };
 }
+
 macro_rules! read_csr_as_usize {
     ($csr_number:expr) => {
         read_csr!($csr_number);
@@ -40,6 +60,18 @@ macro_rules! read_csr_as_usize {
     };
 }
 
+macro_rules! read_csr_as_usize_rv32 {
+    ($csr_number:expr) => {
+        read_csr_rv32!($csr_number);
+
+        /// Reads the CSR
+        #[inline]
+        pub fn read() -> usize {
+            unsafe{ _read() }
+        }
+    };
+}
+
 macro_rules! write_csr {
     ($csr_number:expr) => {
         /// Writes the CSR

src/register/mcause.rs

@@ -136,19 +136,4 @@ impl Mcause {
     }
 }
 
-/// Reads the CSR
-#[inline]
-pub fn read() -> Mcause {
-    match () {
-        #[cfg(any(target_arch = "riscv32", target_arch = "riscv64"))]
-        () => {
-            let r: usize;
-            unsafe {
-                asm!("csrrs $0, 0x342, x0" : "=r"(r) ::: "volatile");
-            }
-            Mcause { bits: r }
-        }
-        #[cfg(not(any(target_arch = "riscv32", target_arch = "riscv64")))]
-        () => unimplemented!(),
-    }
-}
+read_csr_as!(Mcause, 0x342);

src/register/mcycle.rs

@@ -1,18 +1,3 @@
 //! mcycle register
 
-/// Reads the CSR
-#[inline]
-pub fn read() -> usize {
-    match () {
-        #[cfg(any(target_arch = "riscv32", target_arch = "riscv64"))]
-        () => {
-            let r: usize;
-            unsafe {
-                asm!("csrrs $0, 0xB00, x0" : "=r"(r) ::: "volatile");
-            }
-            r
-        }
-        #[cfg(not(any(target_arch = "riscv32", target_arch = "riscv64")))]
-        () => unimplemented!(),
-    }
-}
+read_csr_as_usize!(0xB00);

src/register/mcycleh.rs

@@ -1,18 +1,3 @@
 //! mcycleh register
 
-/// Reads the CSR
-#[inline]
-pub fn read() -> usize {
-    match () {
-        #[cfg(target_arch = "riscv32")]
-        () => {
-            let r: usize;
-            unsafe {
-                asm!("csrrs $0, 0xB80, x0" : "=r"(r) ::: "volatile");
-            }
-            r
-        }
-        #[cfg(not(target_arch = "riscv32"))]
-        () => unimplemented!(),
-    }
-}
+read_csr_as_usize_rv32!(0xB80);

src/register/mepc.rs

@@ -1,18 +1,3 @@
 //! mepc register
 
-/// Reads the CSR
-#[inline]
-pub fn read() -> usize {
-    match () {
-        #[cfg(any(target_arch = "riscv32", target_arch = "riscv64"))]
-        () => {
-            let r: usize;
-            unsafe {
-                asm!("csrrs $0, 0x341, x0" : "=r"(r) ::: "volatile");
-            }
-            r
-        },
-        #[cfg(not(any(target_arch = "riscv32", target_arch = "riscv64")))]
-        () => unimplemented!(),
-    }
-}
+read_csr_as_usize!(0x341);

src/register/mie.rs

@@ -68,71 +68,9 @@ impl Mie {
     }
 }
 
-/// Reads the CSR
-#[inline]
-pub fn read() -> Mie {
-    match () {
-        #[cfg(any(target_arch = "riscv32", target_arch = "riscv64"))]
-        () => {
-            let r: usize;
-            unsafe {
-                asm!("csrrs $0, 0x304, x0" : "=r"(r) ::: "volatile");
-            }
-            Mie { bits: r }
-        }
-        #[cfg(not(any(target_arch = "riscv32", target_arch = "riscv64")))]
-        () => unimplemented!(),
-    }
-}
-
-/// Sets the CSR
-#[cfg_attr(not(any(target_arch = "riscv32", target_arch = "riscv64")), allow(unused_variables))]
-#[inline]
-unsafe fn set(bits: usize) {
-    match () {
-        #[cfg(any(target_arch = "riscv32", target_arch = "riscv64"))]
-        () => asm!("csrrs x0, 0x304, $0" :: "r"(bits) :: "volatile"),
-        #[cfg(not(any(target_arch = "riscv32", target_arch = "riscv64")))]
-        () => unimplemented!(),
-    }
-}
-
-/// Clears the CSR
-#[cfg_attr(not(any(target_arch = "riscv32", target_arch = "riscv64")), allow(unused_variables))]
-#[inline]
-unsafe fn clear(bits: usize) {
-    match () {
-        #[cfg(any(target_arch = "riscv32", target_arch = "riscv64"))]
-        () => asm!("csrrc x0, 0x304, $0" :: "r"(bits) :: "volatile"),
-        #[cfg(not(any(target_arch = "riscv32", target_arch = "riscv64")))]
-        () => unimplemented!(),
-    }
-}
-
-macro_rules! set_csr {
-    ($set_field:ident, $e:expr) => {
-        #[inline]
-        pub unsafe fn $set_field() {
-            set($e);
-        }
-    }
-}
-
-macro_rules! clear_csr {
-    ($clear_field:ident, $e:expr) => {
-        #[inline]
-        pub unsafe fn $clear_field() {
-            clear($e);
-        }
-    }
-}
-
-macro_rules! set_clear_csr {
-    ($set_field:ident, $clear_field:ident, $e:expr) => {
-        set_csr!($set_field, $e);
-        clear_csr!($clear_field, $e);
-    }
-}
+read_csr_as!(Mie, 0x304);
+set!(0x304);
+clear!(0x304);
 
 /// User Software Interrupt Enable
 set_clear_csr!(set_usoft, clear_usoft, 1 << 0);

src/register/minstret.rs

@@ -1,18 +1,3 @@
 //! minstret register
 
-/// Reads the CSR
-#[inline]
-pub fn read() -> usize {
-    match () {
-        #[cfg(any(target_arch = "riscv32", target_arch = "riscv64"))]
-        () => {
-            let r: usize;
-            unsafe {
-                asm!("csrrs $0, 0xB02, x0" : "=r"(r) ::: "volatile");
-            }
-            r
-        }
-        #[cfg(not(any(target_arch = "riscv32", target_arch = "riscv64")))]
-        () => unimplemented!(),
-    }
-}
+read_csr_as_usize!(0xB02);

src/register/minstreth.rs

@@ -1,18 +1,3 @@
 //! minstreth register
 
-/// Reads the CSR
-#[inline]
-pub fn read() -> usize {
-    match () {
-        #[cfg(target_arch = "riscv32")]
-        () => {
-            let r: usize;
-            unsafe {
-                asm!("csrrs $0, 0xB82, x0" : "=r"(r) ::: "volatile");
-            }
-            r
-        },
-        #[cfg(not(target_arch = "riscv32"))]
-        () => unimplemented!(),
-    }
-}
+read_csr_as_usize_rv32!(0xB82);

src/register/mip.rs

@@ -68,19 +68,4 @@ impl Mip {
     }
 }
 
-/// Reads the CSR
-#[inline]
-pub fn read() -> Mip {
-    match () {
-        #[cfg(any(target_arch = "riscv32", target_arch = "riscv64"))]
-        () => {
-            let r: usize;
-            unsafe {
-                asm!("csrrs $0, 0x344, x0" : "=r"(r) ::: "volatile");
-            }
-            Mip { bits: r }
-        }
-        #[cfg(not(any(target_arch = "riscv32", target_arch = "riscv64")))]
-        () => unimplemented!(),
-    }
-}
+read_csr_as!(Mip, 0x344);

src/register/misa.rs

@@ -47,21 +47,13 @@ impl Misa {
     }
 }
 
+read_csr!(0x301);
+
 /// Reads the CSR
 #[inline]
 pub fn read() -> Option<Misa> {
-    match () {
-        #[cfg(any(target_arch = "riscv32", target_arch = "riscv64"))]
-        () => {
-            let r: usize;
-            unsafe {
-                asm!("csrrs $0, 0x301, x0" : "=r"(r) ::: "volatile");
-            }
-            // When misa is hardwired to zero it means that the misa csr
-            // isn't implemented.
-            NonZeroUsize::new(r).map(|bits| Misa { bits })
-        },
-        #[cfg(not(any(target_arch = "riscv32", target_arch = "riscv64")))]
-        () => unimplemented!(),
-    }
+    let r = unsafe{ _read() };
+    // When misa is hardwired to zero it means that the misa csr
+    // isn't implemented.
+    NonZeroUsize::new(r).map(|bits| Misa { bits })
 }

src/register/mstatus.rs

@@ -79,71 +79,9 @@ impl Mstatus {
 }
 
 
-/// Reads the CSR
-#[inline]
-pub fn read() -> Mstatus {
-    match () {
-        #[cfg(any(target_arch = "riscv32", target_arch = "riscv64"))]
-        () => {
-            let r: usize;
-            unsafe {
-                asm!("csrrs $0, 0x300, x0" : "=r"(r) ::: "volatile");
-            }
-            Mstatus { bits: r }
-        }
-        #[cfg(not(any(target_arch = "riscv32", target_arch = "riscv64")))]
-        () => unimplemented!(),
-    }
-}
-
-/// Sets the CSR
-#[cfg_attr(not(any(target_arch = "riscv32", target_arch = "riscv64")), allow(unused_variables))]
-#[inline]
-unsafe fn set(bits: usize) {
-    match () {
-        #[cfg(any(target_arch = "riscv32", target_arch = "riscv64"))]
-        () => asm!("csrrs x0, 0x300, $0" :: "r"(bits) :: "volatile"),
-        #[cfg(not(any(target_arch = "riscv32", target_arch = "riscv64")))]
-        () => unimplemented!(),
-    }
-}
-
-/// Clears the CSR
-#[cfg_attr(not(any(target_arch = "riscv32", target_arch = "riscv64")), allow(unused_variables))]
-#[inline]
-unsafe fn clear(bits: usize) {
-    match () {
-        #[cfg(any(target_arch = "riscv32", target_arch = "riscv64"))]
-        () => asm!("csrrc x0, 0x300, $0" :: "r"(bits) :: "volatile"),
-        #[cfg(not(any(target_arch = "riscv32", target_arch = "riscv64")))]
-        () => unimplemented!(),
-    }
-}
-
-macro_rules! set_csr {
-    ($set_field:ident, $e:expr) => {
-        #[inline]
-        pub unsafe fn $set_field() {
-            set($e);
-        }
-    }
-}
-
-macro_rules! clear_csr {
-    ($clear_field:ident, $e:expr) => {
-        #[inline]
-        pub unsafe fn $clear_field() {
-            clear($e);
-        }
-    }
-}
-
-macro_rules! set_clear_csr {
-    ($set_field:ident, $clear_field:ident, $e:expr) => {
-        set_csr!($set_field, $e);
-        clear_csr!($clear_field, $e);
-    }
-}
+read_csr_as!(Mstatus, 0x300);
+set!(0x300);
+clear!(0x300);
 
 /// User Interrupt Enable
 set_clear_csr!(set_uie, clear_uie, 1 << 0);
@@ -160,10 +98,10 @@ set_csr!(set_mpie, 1 << 7);
 /// Supervisor Previous Privilege Mode
 #[inline]
 pub unsafe fn set_spp(spp: SPP) {
-    set((spp as usize) << 8);
+    _set((spp as usize) << 8);
 }
 /// Machine Previous Privilege Mode
 #[inline]
 pub unsafe fn set_mpp(mpp: MPP) {
-    set((mpp as usize) << 11);
+    _set((mpp as usize) << 11);
 }