Add detail to pmpcfgx.rs to return the individual pmp[x]cfg register information.

Author: dkhayes117

src/register/pmpcfgx.rs

@@ -1,7 +1,129 @@
 /// Physical memory protection configuration
+
 pub mod pmpcfg0 {
-    read_csr_as_usize!(0x3A0, __read_pmpcfg0);
-    write_csr_as_usize!(0x3A0, __write_pmpcfg0);
+    use bit_field::BitField;
+
+    #[derive(Clone, Copy, Debug)]
+    pub enum Permission {
+        NONE = 0,
+        R = 1,
+        W = 2,
+        RW = 3,
+        X = 4,
+        RX = 5,
+        WX = 6,
+        RWX = 7,
+    }
+
+    #[derive(Clone, Copy, Debug)]
+    pub enum Range {
+        OFF = 0,
+        TOR = 1,
+        NA4 = 2,
+        NAPOT = 3,
+    }
+
+    #[derive(Clone, Copy, Debug)]
+    pub struct Pmpconfig {
+        pub permission: Permission,
+        pub range_type: Range,
+        pub locked: bool,
+    }
+
+    #[derive(Clone, Copy, Debug)]
+    pub struct Pmpcfg0 {
+        bits: usize,
+    }
+
+    impl Pmpcfg0 {
+        ///Returns the pmp byte associated with the index
+        #[inline]
+        pub fn pmp_byte(&self, index: usize) -> usize {
+            assert!(index < 8);
+            match index {
+                0 => self.bits.get_bits(0..8),
+                1 => self.bits.get_bits(8..16),
+                2 => self.bits.get_bits(16..24),
+                3 => self.bits.get_bits(24..32),
+                4 => self.bits.get_bits(32..40),
+                5 => self.bits.get_bits(40..48),
+                6 => self.bits.get_bits(48..56),
+                7 => self.bits.get_bits(56..64),
+                _ => panic!(),
+            }
+        }
+
+        #[inline]
+        fn range(&self, byte: usize) -> Range {
+            match byte.get_bits(3..5) {
+                0 => Range::OFF,
+                1 => Range::TOR,
+                2 => Range::NA4,
+                3 => Range::NAPOT,
+                _ => panic!(),
+            }
+        }
+
+        #[inline]
+        fn permission(&self, byte: usize) -> Permission {
+            match byte.get_bits(3..5) {
+                0 => Permission::NONE,
+                1 => Permission::R,
+                2 => Permission::W,
+                3 => Permission::RW,
+                4 => Permission::X,
+                5 => Permission::RX,
+                6 => Permission::WX,
+                7 => Permission::RWX,
+                _ => panic!(),
+            }
+        }
+
+        ///Returns pmp[x]cfg configuration structure
+        #[inline]
+        pub fn pmp_cfg(&self, index: usize) -> Pmpconfig {
+            assert!(index < 8);
+            let byte = self.pmp_byte(index);
+            let p = self.permission(byte);
+            let r = self.range(byte);
+            let l = byte.get_bit(7);
+
+            Pmpconfig {
+                permission: p,
+                range_type: r,
+                locked: l,
+            }
+        }
+    }
+
+    read_csr_as!(Pmpcfg0, 0x3A0, __read_pmpcfg0);
+    write_csr!(0x3A0, __write_pmpcfg0);
+    set!(0x3A0, __set_pmpcfg0);
+    clear!(0x3A0, __clear_pmpcfg0);
+
+    #[inline]
+    pub unsafe fn set_permissions(permission: Permission, index: usize) {
+        assert!(index < 8);
+        _set((permission as usize) << (index * 8));
+    }
+
+    #[inline]
+    pub unsafe fn set_range(range: Range, index: usize) {
+        assert!(index < 8);
+        _set((range as usize) << (3 + (index * 8)));
+    }
+
+    #[inline]
+    pub unsafe fn set_lock(index: usize) {
+        assert!(index < 8);
+        _set(1 << (7 + (index * 8)));
+    }
+
+    #[inline]
+    pub unsafe fn clear_lock(index: usize) {
+        assert!(index < 8);
+        _set(1 << (7 + (index * 8)));
+    }
 }
 
 /// Physical memory protection configuration, RV32 only