More strict PhysicalAddress type

src/memory/mod.rs

@@ -83,7 +83,7 @@ impl Frame {
     }
 
     fn start_address(&self) -> PhysicalAddress {
-        self.number * PAGE_SIZE
+        PhysicalAddress((self.number * PAGE_SIZE) as u64)
     }
 
     fn clone(&self) -> Frame {

src/memory/paging/address.rs

@@ -0,0 +1,21 @@
+use consts::KERNEL_OFFSET;
+pub use x86_64::{PhysicalAddress};
+pub type VirtualAddress = usize;
+
+pub trait FromToVirtualAddress {
+	fn to_identity_virtual(&self) -> VirtualAddress;
+	fn to_kernel_virtual(&self) -> VirtualAddress;
+	fn from_kernel_virtual(addr: VirtualAddress) -> Self;
+}
+
+impl FromToVirtualAddress for PhysicalAddress {
+	fn to_identity_virtual(&self) -> VirtualAddress {
+		self.0 as usize
+	}
+	fn to_kernel_virtual(&self) -> VirtualAddress {
+		self.0 as usize + KERNEL_OFFSET
+	}
+	fn from_kernel_virtual(addr: VirtualAddress) -> Self {
+		PhysicalAddress((addr - KERNEL_OFFSET) as u64)
+	}
+}

src/memory/paging/entry.rs

@@ -27,8 +27,8 @@ impl Entry {
     }
 
     pub fn set(&mut self, frame: Frame, flags: EntryFlags) {
-        assert!(frame.start_address() & !0x000fffff_fffff000 == 0);
-        self.0 = (frame.start_address() as u64) | flags.bits();
+        assert!(frame.start_address().0 & !0x000fffff_fffff000 == 0);
+        self.0 = (frame.start_address().0) | flags.bits();
     }
 }
 

src/memory/paging/mapper.rs

@@ -1,4 +1,4 @@
-use super::{VirtualAddress, PhysicalAddress, Page, ENTRY_COUNT};
+use super::{VirtualAddress, PhysicalAddress, Page, ENTRY_COUNT, FromToVirtualAddress};
 use super::entry::*;
 use super::table::{self, Table, Level4, Level1};
 use memory::{PAGE_SIZE, Frame, FrameAllocator};
@@ -26,7 +26,7 @@ impl Mapper {
     pub fn translate(&self, virtual_address: VirtualAddress) -> Option<PhysicalAddress> {
         let offset = virtual_address % PAGE_SIZE;
         self.translate_page(Page::containing_address(virtual_address))
-            .map(|frame| frame.number * PAGE_SIZE + offset)
+            .map(|frame| PhysicalAddress((frame.number * PAGE_SIZE + offset) as u64))
     }
 
     pub fn translate_page(&self, page: Page) -> Option<Frame> {
@@ -92,7 +92,7 @@ impl Mapper {
     pub fn identity_map<A>(&mut self, frame: Frame, flags: EntryFlags, allocator: &mut A)
         where A: FrameAllocator
     {
-        let page = Page::containing_address(frame.start_address());
+        let page = Page::containing_address(frame.start_address().to_identity_virtual());
         self.map_to(page, frame, flags, allocator)
     }
 

src/memory/paging/mod.rs

@@ -6,18 +6,17 @@ use memory::{PAGE_SIZE, Frame, FrameAllocator};
 use multiboot2::BootInformation;
 use self::table::{Table, Level4};
 use self::temporary_page::TemporaryPage;
+pub use self::address::*;
 use consts::KERNEL_OFFSET;
 
 mod entry;
 mod table;
 mod temporary_page;
 mod mapper;
+mod address;
 
 const ENTRY_COUNT: usize = 512;
 
-pub type PhysicalAddress = usize;
-pub type VirtualAddress = usize;
-
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
 pub struct Page {
    number: usize,
@@ -151,8 +150,7 @@ impl ActivePageTable {
             ),
         };
         unsafe {
-            control_regs::cr3_write(PhysicalAddress(
-                new_table.p4_frame.start_address() as u64));
+            control_regs::cr3_write(new_table.p4_frame.start_address());
         }
         old_table
     }
@@ -223,7 +221,7 @@ pub fn remap_the_kernel<A>(allocator: &mut A, boot_info: &BootInformation)
             let end_frame = to_physical_frame(section.end_address() - 1);
 
             for frame in Frame::range_inclusive(start_frame, end_frame) {
-                let page = Page::containing_address(frame.start_address() + KERNEL_OFFSET);
+                let page = Page::containing_address(frame.start_address().to_kernel_virtual());
                 mapper.map_to(page, frame, flags, allocator);
             }
         }
@@ -238,6 +236,7 @@ pub fn remap_the_kernel<A>(allocator: &mut A, boot_info: &BootInformation)
         for frame in Frame::range_inclusive(multiboot_start, multiboot_end) {
             mapper.identity_map(frame, PRESENT, allocator);
         }
+        debug!("{:?}", mapper as *const Mapper);
     });
 
     let old_table = active_table.switch(new_table);
@@ -245,7 +244,7 @@ pub fn remap_the_kernel<A>(allocator: &mut A, boot_info: &BootInformation)
 
     // turn the old p4 page into a guard page
     let old_p4_page = Page::containing_address(
-      old_table.p4_frame.start_address()
+      old_table.p4_frame.start_address().to_identity_virtual()
     );
     active_table.unmap(old_p4_page, allocator);
     println!("guard page at {:#x}", old_p4_page.start_address());

src/memory/paging/table.rs

@@ -108,7 +108,7 @@ impl Debug for Table<Level4> {
         // Ignore the 511th recursive entry
         let entries = self.entries.iter().enumerate().filter(|(i, e)| !e.is_unused() && *i != 511usize);
         for (i, e) in entries {
-            write!(f, "{:3}: {:?}\n", i, e)?;
+            write!(f, "{:3X}: {:?}\n", i, e)?;
             write!(f, "{:?}", self.next_table(i).unwrap())?;
         }
         Ok(())
@@ -119,7 +119,7 @@ impl Debug for Table<Level3> {
     fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
         let entries = self.entries.iter().enumerate().filter(|(i, e)| !e.is_unused());
         for (i, e) in entries {
-            write!(f, "  {:3}: {:?}\n", i, e)?;
+            write!(f, "  {:3X}: {:?}\n", i, e)?;
             write!(f, "{:?}", self.next_table(i).unwrap())?;
         }
         Ok(())
@@ -130,7 +130,7 @@ impl Debug for Table<Level2> {
     fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
         let entries = self.entries.iter().enumerate().filter(|(i, e)| !e.is_unused());
         for (i, e) in entries {
-            write!(f, "    {:3}: {:?}\n", i, e)?;
+            write!(f, "    {:3X}: {:?}\n", i, e)?;
             write!(f, "{:?}", self.next_table(i).unwrap())?;
         }
         Ok(())
@@ -141,7 +141,7 @@ impl Debug for Table<Level1> {
     fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
         let entries = self.entries.iter().enumerate().filter(|(i, e)| !e.is_unused());
         for (i, e) in entries {
-            write!(f, "      {:3}: {:?}\n", i, e)?;
+            write!(f, "      {:3X}: {:?}\n", i, e)?;
         }
         Ok(())
     }