init: mm

just some ground work and newtype pattern

1 files changed, 100 insertions, 0 deletions

diff --git a/kernel/src/mm.rs b/kernel/src/mm.rs
new file mode 100644
index 0000000..0a2c5ad
--- /dev/null
+++ b/kernel/src/mm.rs
@@ -0,0 +1,100 @@
+use core::ops::Deref;
+
+use atomic::Atomic;
+
+static KERNEL_VIRTUAL_BASE: Atomic<PhysicalMemoryAddress> =
+    Atomic::new(PhysicalMemoryAddress(0xFFFFFFFF80000000));
+
+#[derive(Clone, Copy)]
+pub struct VirtualMemoryAddress(pub usize);
+
+impl Deref for VirtualMemoryAddress {
+    type Target = usize;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl From<usize> for VirtualMemoryAddress {
+    fn from(value: usize) -> Self {
+        VirtualMemoryAddress(value)
+    }
+}
+
+impl From<VirtualMemoryAddress> for usize {
+    fn from(value: VirtualMemoryAddress) -> Self {
+        value.0
+    }
+}
+
+impl From<PhysicalMemoryAddress> for VirtualMemoryAddress {
+    fn from(value: PhysicalMemoryAddress) -> Self {
+        VirtualMemoryAddress(value.0)
+    }
+}
+
+#[derive(Clone, Copy)]
+pub struct PhysicalMemoryAddress(pub usize);
+
+impl Deref for PhysicalMemoryAddress {
+    type Target = usize;
+
+    fn deref(&self) -> &Self::Target {
+        &self.0
+    }
+}
+
+impl From<usize> for PhysicalMemoryAddress {
+    fn from(value: usize) -> Self {
+        PhysicalMemoryAddress(value)
+    }
+}
+
+impl From<PhysicalMemoryAddress> for usize {
+    fn from(value: PhysicalMemoryAddress) -> Self {
+        value.0
+    }
+}
+
+impl From<VirtualMemoryAddress> for PhysicalMemoryAddress {
+    fn from(value: VirtualMemoryAddress) -> Self {
+        PhysicalMemoryAddress(value.0)
+    }
+}
+
+#[derive(Clone, Copy)]
+pub enum MemoryAddress {
+    Virtual(VirtualMemoryAddress),
+    Physical(PhysicalMemoryAddress),
+}
+
+impl From<VirtualMemoryAddress> for MemoryAddress {
+    fn from(value: VirtualMemoryAddress) -> Self {
+        MemoryAddress::Virtual(value)
+    }
+}
+
+impl From<PhysicalMemoryAddress> for MemoryAddress {
+    fn from(value: PhysicalMemoryAddress) -> Self {
+        MemoryAddress::Physical(value)
+    }
+}
+
+impl From<MemoryAddress> for usize {
+    fn from(value: MemoryAddress) -> Self {
+        match value {
+            MemoryAddress::Virtual(v) => *v,
+            MemoryAddress::Physical(p) => *p,
+        }
+    }
+}
+
+impl From<MemoryAddress> for VirtualMemoryAddress {
+    fn from(value: MemoryAddress) -> Self {
+        match value {
+            MemoryAddress::Virtual(v) => v,
+            MemoryAddress::Physical(p) => VirtualMemoryAddress(p.0),
+        }
+    }
+}