Add simple paging, use rust libcore and compile without sse

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "rust"]
+	path = rust
+	url = https://github.com/rust-lang/rust.git

Makefile

@@ -14,12 +14,25 @@ qemu: build/harddrive.bin
 
 FORCE:
 
-build:
+build/libcore.rlib: rust/src/libcore/lib.rs
-	mkdir build
+	mkdir -p build
+	./rustc.sh --target $(ARCH)-unknown-none.json -C soft-float -o $@ $<
 
-build/libkernel.a: build FORCE
+build/liballoc.rlib: rust/src/liballoc/lib.rs build/libcore.rlib
-	cargo rustc -- --crate-type staticlib -o $@
+	mkdir -p build
-	#--target $(ARCH)-unknown-none.json
+	./rustc.sh --target $(ARCH)-unknown-none.json -C soft-float -o $@ $<
+
+build/librustc_unicode.rlib: rust/src/librustc_unicode/lib.rs build/libcore.rlib
+	mkdir -p build
+	./rustc.sh --target $(ARCH)-unknown-none.json -C soft-float -o $@ $<
+
+build/libcollections.rlib: rust/src/libcollections/lib.rs build/libcore.rlib build/liballoc.rlib build/librustc_unicode.rlib
+	mkdir -p build
+	./rustc.sh --target $(ARCH)-unknown-none.json -C soft-float -o $@ $<
+
+build/libkernel.a: build/libcore.rlib build/liballoc.rlib build/libcollections.rlib FORCE
+	mkdir -p build
+	RUSTC="./rustc.sh" cargo rustc --verbose --target $(ARCH)-unknown-none.json -- -C soft-float -o $@
 
 build/kernel.bin: build/libkernel.a
 	ld -m elf_$(ARCH) --gc-sections -z max-page-size=0x1000 -T bootloader/x86/kernel.ld -o $@ $<
@@ -31,4 +44,4 @@ build/harddrive.bin: build/kernel.bin
 	nasm -f bin -o $@ -D ARCH_$(ARCH) -ibootloader/x86/ -ibuild/ bootloader/x86/harddrive.asm
 
 clean:
-	rm -rf build/*
+	rm -rf build/* target/*

arch/x86_64/src/idt.rs

@@ -7,6 +7,15 @@ pub static mut IDTR: IdtDescriptor = IdtDescriptor {
 
 pub static mut IDT: [IdtEntry; 256] = [IdtEntry::new(); 256];
 
+pub unsafe fn init(func: unsafe extern fn()) {
+    for entry in IDT.iter_mut() {
+        entry.set_flags(IDT_PRESENT | IDT_RING_0 | IDT_INTERRUPT);
+        entry.set_offset(8, func as usize);
+    }
+    IDTR.set_slice(&IDT);
+    IDTR.load();
+}
+
 bitflags! {
     pub flags IdtFlags: u8 {
         const IDT_PRESENT = 1 << 7,

arch/x86_64/src/lib.rs

@@ -5,6 +5,7 @@
 #![feature(const_fn)]
 #![feature(core_intrinsics)]
 #![feature(naked_functions)]
+#![feature(unique)]
 #![no_std]
 
 #[macro_use]
@@ -67,6 +68,9 @@ macro_rules! interrupt {
     };
 }
 
+/// Memcpy, memmove, etc.
+pub mod externs;
+
 /// Global descriptor table
 pub mod gdt;
 
@@ -82,13 +86,14 @@ pub mod interrupt;
 /// Initialization and main function
 pub mod main;
 
-/// Memcpy, memmove, etc.
+/// Memory management
-pub mod mem;
+pub mod memory;
+
+/// Paging
+pub mod paging;
 
 /// Serial driver and print! support
 pub mod serial;
 
 /// Task state segment
 pub mod tss;
-
-pub mod physical;

arch/x86_64/src/main.rs

@@ -3,8 +3,20 @@
 /// It must create the IDT with the correct entries, those entries are
 /// defined in other files inside of the `arch` module
 
-use super::idt::{IDTR, IDT, IDT_PRESENT, IDT_RING_0, IDT_INTERRUPT};
+use externs::memset;
-use super::mem::memset;
+use idt;
+use memory::{self, Frame};
+use paging::{self, entry, PhysicalAddress};
+
+/// Test of zero values in BSS.
+static BSS_TEST_ZERO: usize = 0;
+/// Test of non-zero values in BSS.
+static BSS_TEST_NONZERO: usize = 0xFFFFFFFFFFFFFFFF;
+
+extern {
+    /// Kernel main function
+    fn kmain() -> !;
+}
 
 extern {
     /// The starting byte of the text (code) data segment.
@@ -25,15 +37,6 @@ extern {
     static mut __bss_end: u8;
 }
 
-/// Test of zero values in BSS.
-static BSS_TEST_ZERO: usize = 0;
-/// Test of non-zero values in BSS.
-static BSS_TEST_NONZERO: usize = 0xFFFFFFFFFFFFFFFF;
-
-extern {
-    fn kmain() -> !;
-}
-
 #[no_mangle]
 pub unsafe extern fn kstart() -> ! {
     asm!("xchg bx, bx" : : : : "intel", "volatile");
@@ -52,21 +55,31 @@ pub unsafe extern fn kstart() -> ! {
         debug_assert_eq!(BSS_TEST_NONZERO, 0xFFFFFFFFFFFFFFFF);
     }
 
-    asm!("xchg bx, bx" : : : : "intel", "volatile");
-
     // Set up IDT
-    for entry in IDT.iter_mut() {
+    idt::init(blank);
-        entry.set_flags(IDT_PRESENT | IDT_RING_0 | IDT_INTERRUPT);
+
-        entry.set_offset(8, blank as usize);
+    // Initialize memory management
+    let mut allocator = memory::init(0, &__bss_end as *const u8 as usize);
+
+    // Initialize paging
+    let mut pager = paging::init();
+
+    // Remap a section with `flags`
+    let mut remap_section = |start_ref: &u8, end_ref: &u8, flags: entry::EntryFlags| {
+        let start = start_ref as *const _ as usize;
+        let end = end_ref as *const _ as usize;
+
+        for i in 0..(start - end + paging::PAGE_SIZE - 1)/paging::PAGE_SIZE {
+            let frame = Frame::containing_address(PhysicalAddress::new(start + i * paging::PAGE_SIZE));
+            pager.identity_map(frame, flags, &mut allocator);
         }
-    IDTR.set_slice(&IDT);
+    };
-    IDTR.load();
-
-    asm!("xchg bx, bx" : : : : "intel", "volatile");
-
-    asm!("int 0xFF" : : : : "intel", "volatile");
 
+    // Remap text read-only
+    {
         asm!("xchg bx, bx" : : : : "intel", "volatile");
+        //TODO remap_section(& __text_start, & __text_end, entry::PRESENT);
+    }
 
     kmain();
 }

arch/x86_64/src/memory/area_frame_alloc.rs

@@ -0,0 +1,81 @@
+//! # Area frame allocator
+//! Some code was borrowed from [Phil Opp's Blog](http://os.phil-opp.com/allocating-frames.html)
+
+use paging::PhysicalAddress;
+
+use super::{Frame, FrameAllocator, MemoryArea, MemoryAreaIter};
+
+
+pub struct AreaFrameAllocator {
+    next_free_frame: Frame,
+    current_area: Option<&'static MemoryArea>,
+    areas: MemoryAreaIter,
+    kernel_start: Frame,
+    kernel_end: Frame
+}
+
+impl AreaFrameAllocator {
+    pub fn new(kernel_start: usize, kernel_end: usize, memory_areas: MemoryAreaIter) -> AreaFrameAllocator {
+        let mut allocator = AreaFrameAllocator {
+            next_free_frame: Frame::containing_address(PhysicalAddress::new(0)),
+            current_area: None,
+            areas: memory_areas,
+            kernel_start: Frame::containing_address(PhysicalAddress::new(kernel_start)),
+            kernel_end: Frame::containing_address(PhysicalAddress::new(kernel_end))
+        };
+        allocator.choose_next_area();
+        allocator
+    }
+
+    fn choose_next_area(&mut self) {
+        self.current_area = self.areas.clone().filter(|area| {
+            let address = area.base_addr + area.length - 1;
+            Frame::containing_address(PhysicalAddress::new(address as usize)) >= self.next_free_frame
+        }).min_by_key(|area| area.base_addr);
+
+        if let Some(area) = self.current_area {
+            let start_frame = Frame::containing_address(PhysicalAddress::new(area.base_addr as usize));
+            if self.next_free_frame < start_frame {
+                self.next_free_frame = start_frame;
+            }
+        }
+    }
+}
+
+impl FrameAllocator for AreaFrameAllocator {
+    fn allocate_frame(&mut self) -> Option<Frame> {
+        if let Some(area) = self.current_area {
+            // "Clone" the frame to return it if it's free. Frame doesn't
+            // implement Clone, but we can construct an identical frame.
+            let frame = Frame{ number: self.next_free_frame.number };
+
+            // the last frame of the current area
+            let current_area_last_frame = {
+                let address = area.base_addr + area.length - 1;
+                Frame::containing_address(PhysicalAddress::new(address as usize))
+            };
+
+            if frame > current_area_last_frame {
+                // all frames of current area are used, switch to next area
+                self.choose_next_area();
+            } else if frame >= self.kernel_start && frame <= self.kernel_end {
+                // `frame` is used by the kernel
+                self.next_free_frame = Frame {
+                    number: self.kernel_end.number + 1
+                };
+            } else {
+                // frame is unused, increment `next_free_frame` and return it
+                self.next_free_frame.number += 1;
+                return Some(frame);
+            }
+            // `frame` was not valid, try it again with the updated `next_free_frame`
+            self.allocate_frame()
+        } else {
+            None // no free frames left
+        }
+    }
+
+    fn deallocate_frame(&mut self, frame: Frame) {
+        unimplemented!()
+    }
+}

arch/x86_64/src/memory/mod.rs

@@ -0,0 +1,109 @@
+//! # Memory management
+//! Some code was borrowed from [Phil Opp's Blog](http://os.phil-opp.com/allocating-frames.html)
+
+pub use paging::{PAGE_SIZE, PhysicalAddress};
+
+use self::area_frame_alloc::AreaFrameAllocator;
+
+pub mod area_frame_alloc;
+
+/// The current memory map. It's size is maxed out to 512 entries, due to it being
+/// from 0x500 to 0x5000 (800 is the absolute total)
+static mut MEMORY_MAP: [MemoryArea; 512] = [MemoryArea { base_addr: 0, length: 0, _type: 0, acpi: 0 }; 512];
+
+/// Memory does not exist
+const MEMORY_AREA_NULL: u32 = 0;
+
+/// Memory is free to use
+const MEMORY_AREA_FREE: u32 = 1;
+
+/// Memory is reserved
+const MEMORY_AREA_RESERVED: u32 = 2;
+
+/// Memory is used by ACPI, and can be reclaimed
+const MEMORY_AREA_ACPI: u32 = 3;
+
+#[derive(Clone)]
+pub struct MemoryAreaIter {
+    _type: u32,
+    i: usize
+}
+
+impl MemoryAreaIter {
+    fn new(_type: u32) -> Self {
+        MemoryAreaIter {
+            _type: _type,
+            i: 0
+        }
+    }
+}
+
+impl Iterator for MemoryAreaIter {
+    type Item = &'static MemoryArea;
+    fn next(&mut self) -> Option<Self::Item> {
+        while self.i < unsafe { MEMORY_MAP.len() } {
+            let entry = unsafe { &MEMORY_MAP[self.i] };
+            self.i += 1;
+            if entry._type == self._type {
+                return Some(entry);
+            }
+        }
+        None
+    }
+}
+
+/// Init memory module
+/// Must be called once, and only once,
+pub unsafe fn init(kernel_start: usize, kernel_end: usize) -> AreaFrameAllocator {
+    // Copy memory map from bootloader location
+    for (i, mut entry) in MEMORY_MAP.iter_mut().enumerate() {
+        *entry = *(0x500 as *const MemoryArea).offset(i as isize);
+        if entry.length > 0 {
+            println!("{:?}", entry);
+        }
+    }
+
+    AreaFrameAllocator::new(kernel_start, kernel_end, MemoryAreaIter::new(MEMORY_AREA_FREE))
+}
+
+/// A memory map area
+#[derive(Copy, Clone, Debug, Default)]
+#[repr(packed)]
+pub struct MemoryArea {
+    pub base_addr: u64,
+    pub length: u64,
+    pub _type: u32,
+    pub acpi: u32
+}
+
+/// A frame, allocated by the frame allocator.
+/// Do not add more derives, or make anything `pub`!
+#[derive(Debug, PartialEq, Eq, PartialOrd, Ord)]
+pub struct Frame {
+    number: usize
+}
+
+impl Frame {
+    /// Create a frame containing `address`
+    pub fn containing_address(address: PhysicalAddress) -> Frame {
+        Frame {
+            number: address.get() / PAGE_SIZE
+        }
+    }
+
+    /// Get the address of this frame
+    pub fn start_address(&self) -> PhysicalAddress {
+        PhysicalAddress::new(self.number * PAGE_SIZE)
+    }
+
+    fn clone(&self) -> Frame {
+        Frame {
+            number: self.number
+        }
+    }
+}
+
+pub trait FrameAllocator {
+    fn allocate_frame(&mut self) -> Option<Frame>;
+    fn deallocate_frame(&mut self, frame: Frame);
+}

arch/x86_64/src/paging/entry.rs

@@ -0,0 +1,62 @@
+//! # Page table entry
+//! Some code borrowed from [Phil Opp's Blog](http://os.phil-opp.com/modifying-page-tables.html)
+
+use memory::Frame;
+
+use super::PhysicalAddress;
+
+/// A page table entry
+pub struct Entry(u64);
+
+bitflags! {
+    pub flags EntryFlags: u64 {
+        const PRESENT =         1 << 0,
+        const WRITABLE =        1 << 1,
+        const USER_ACCESSIBLE = 1 << 2,
+        const WRITE_THROUGH =   1 << 3,
+        const NO_CACHE =        1 << 4,
+        const ACCESSED =        1 << 5,
+        const DIRTY =           1 << 6,
+        const HUGE_PAGE =       1 << 7,
+        const GLOBAL =          1 << 8,
+        const NO_EXECUTE =      1 << 63,
+    }
+}
+
+pub const ADDRESS_MASK: usize = 0x000fffff_fffff000;
+
+impl Entry {
+    /// Is the entry unused?
+    pub fn is_unused(&self) -> bool {
+        self.0 == 0
+    }
+
+    /// Make the entry unused
+    pub fn set_unused(&mut self) {
+        self.0 = 0;
+    }
+
+    /// Get the address this page references
+    pub fn address(&self) -> PhysicalAddress {
+        PhysicalAddress::new(self.0 as usize & ADDRESS_MASK)
+    }
+
+    /// Get the current entry flags
+    pub fn flags(&self) -> EntryFlags {
+        EntryFlags::from_bits_truncate(self.0)
+    }
+
+    /// Get the associated frame, if available
+    pub fn pointed_frame(&self) -> Option<Frame> {
+        if self.flags().contains(PRESENT) {
+            Some(Frame::containing_address(self.address()))
+        } else {
+            None
+        }
+    }
+
+    pub fn set(&mut self, frame: Frame, flags: EntryFlags) {
+        debug_assert!(frame.start_address().get() & !ADDRESS_MASK == 0);
+        self.0 = (frame.start_address().get() as u64) | flags.bits();
+    }
+}

arch/x86_64/src/paging/mod.rs

@@ -0,0 +1,165 @@
+//! # Paging
+//! Some code was borrowed from [Phil Opp's Blog](http://os.phil-opp.com/modifying-page-tables.html)
+
+use core::ptr::Unique;
+
+use memory::{Frame, FrameAllocator};
+
+use self::entry::EntryFlags;
+use self::table::{Table, Level4};
+
+pub mod entry;
+pub mod table;
+
+/// Number of entries per page table
+pub const ENTRY_COUNT: usize = 512;
+
+/// Size of pages
+pub const PAGE_SIZE: usize = 4096;
+
+/// Initialize paging
+pub unsafe fn init() -> ActivePageTable {
+    ActivePageTable::new()
+}
+
+pub struct ActivePageTable {
+    p4: Unique<Table<Level4>>,
+}
+
+impl ActivePageTable {
+    /// Create a new page table
+    pub unsafe fn new() -> ActivePageTable {
+        ActivePageTable {
+            p4: Unique::new(table::P4),
+        }
+    }
+
+    fn p4(&self) -> &Table<Level4> {
+        unsafe { self.p4.get() }
+    }
+
+    fn p4_mut(&mut self) -> &mut Table<Level4> {
+        unsafe { self.p4.get_mut() }
+    }
+
+    /// Map a page to a frame
+    pub fn map_to<A>(&mut self, page: Page, frame: Frame, flags: EntryFlags, allocator: &mut A)
+        where A: FrameAllocator
+    {
+        let mut p3 = self.p4_mut().next_table_create(page.p4_index(), allocator);
+        let mut p2 = p3.next_table_create(page.p3_index(), allocator);
+        let mut p1 = p2.next_table_create(page.p2_index(), allocator);
+
+        assert!(p1[page.p1_index()].is_unused());
+        p1[page.p1_index()].set(frame, flags | entry::PRESENT);
+    }
+
+    /// Map a page to the next free frame
+    pub fn map<A>(&mut self, page: Page, flags: EntryFlags, allocator: &mut A)
+        where A: FrameAllocator
+    {
+        let frame = allocator.allocate_frame().expect("out of memory");
+        self.map_to(page, frame, flags, allocator)
+    }
+
+    /// Identity map a frame
+    pub fn identity_map<A>(&mut self, frame: Frame, flags: EntryFlags, allocator: &mut A)
+        where A: FrameAllocator
+    {
+        let page = Page::containing_address(VirtualAddress::new(frame.start_address().get()));
+        self.map_to(page, frame, flags, allocator)
+    }
+
+    /// Unmap a page
+    fn unmap<A>(&mut self, page: Page, allocator: &mut A)
+        where A: FrameAllocator
+    {
+        assert!(self.translate(page.start_address()).is_some());
+
+        let p1 = self.p4_mut()
+                     .next_table_mut(page.p4_index())
+                     .and_then(|p3| p3.next_table_mut(page.p3_index()))
+                     .and_then(|p2| p2.next_table_mut(page.p2_index()))
+                     .expect("mapping code does not support huge pages");
+        let frame = p1[page.p1_index()].pointed_frame().unwrap();
+        p1[page.p1_index()].set_unused();
+        // TODO free p(1,2,3) table if empty
+        allocator.deallocate_frame(frame);
+    }
+
+    fn translate_page(&self, page: Page) -> Option<Frame> {
+        self.p4().next_table(page.p4_index())
+            .and_then(|p3| p3.next_table(page.p3_index()))
+            .and_then(|p2| p2.next_table(page.p2_index()))
+            .and_then(|p1| p1[page.p1_index()].pointed_frame())
+    }
+
+    /// Translate a virtual address to a physical one
+    pub fn translate(&self, virtual_address: VirtualAddress) -> Option<PhysicalAddress> {
+        let offset = virtual_address.get() % PAGE_SIZE;
+        self.translate_page(Page::containing_address(virtual_address))
+            .map(|frame| PhysicalAddress::new(frame.start_address().get() + offset))
+    }
+}
+
+/// A physical address.
+#[derive(Copy, Clone, Debug, Eq, Ord, PartialEq, PartialOrd)]
+pub struct PhysicalAddress(usize);
+
+impl PhysicalAddress {
+    pub fn new(address: usize) -> Self {
+        PhysicalAddress(address)
+    }
+
+    pub fn get(&self) -> usize {
+        self.0
+    }
+}
+
+/// A virtual address.
+#[derive(Copy, Clone, Debug, Eq, Ord, PartialEq, PartialOrd)]
+pub struct VirtualAddress(usize);
+
+impl VirtualAddress {
+    pub fn new(address: usize) -> Self {
+        VirtualAddress(address)
+    }
+
+    pub fn get(&self) -> usize {
+        self.0
+    }
+}
+
+/// Page
+#[derive(Debug, Clone, Copy)]
+pub struct Page {
+    number: usize
+}
+
+impl Page {
+    fn start_address(&self) -> VirtualAddress {
+        VirtualAddress::new(self.number * PAGE_SIZE)
+    }
+
+    fn p4_index(&self) -> usize {
+        (self.number >> 27) & 0o777
+    }
+
+    fn p3_index(&self) -> usize {
+        (self.number >> 18) & 0o777
+    }
+
+    fn p2_index(&self) -> usize {
+        (self.number >> 9) & 0o777
+    }
+
+    fn p1_index(&self) -> usize {
+        (self.number >> 0) & 0o777
+    }
+
+    pub fn containing_address(address: VirtualAddress) -> Page {
+        assert!(address.get() < 0x0000_8000_0000_0000 || address.get() >= 0xffff_8000_0000_0000,
+            "invalid address: 0x{:x}", address.get());
+        Page { number: address.get() / PAGE_SIZE }
+    }
+}

arch/x86_64/src/paging/table.rs

@@ -0,0 +1,100 @@
+//! # Page table
+//! Code borrowed from [Phil Opp's Blog](http://os.phil-opp.com/modifying-page-tables.html)
+
+use core::marker::PhantomData;
+use core::ops::{Index, IndexMut};
+
+use memory::FrameAllocator;
+
+use super::entry::*;
+use super::ENTRY_COUNT;
+
+pub const P4: *mut Table<Level4> = 0xffffffff_fffff000 as *mut _;
+
+pub trait TableLevel {}
+
+pub enum Level4 {}
+pub enum Level3 {}
+pub enum Level2 {}
+pub enum Level1 {}
+
+impl TableLevel for Level4 {}
+impl TableLevel for Level3 {}
+impl TableLevel for Level2 {}
+impl TableLevel for Level1 {}
+
+pub trait HierarchicalLevel: TableLevel {
+    type NextLevel: TableLevel;
+}
+
+impl HierarchicalLevel for Level4 {
+    type NextLevel = Level3;
+}
+
+impl HierarchicalLevel for Level3 {
+    type NextLevel = Level2;
+}
+
+impl HierarchicalLevel for Level2 {
+    type NextLevel = Level1;
+}
+
+pub struct Table<L: TableLevel> {
+    entries: [Entry; ENTRY_COUNT],
+    level: PhantomData<L>,
+}
+
+impl<L> Table<L> where L: TableLevel {
+    pub fn zero(&mut self) {
+        for entry in self.entries.iter_mut() {
+            entry.set_unused();
+        }
+    }
+}
+
+impl<L> Table<L> where L: HierarchicalLevel {
+    pub fn next_table(&self, index: usize) -> Option<&Table<L::NextLevel>> {
+        self.next_table_address(index).map(|address| unsafe { &*(address as *const _) })
+    }
+
+    pub fn next_table_mut(&mut self, index: usize) -> Option<&mut Table<L::NextLevel>> {
+        self.next_table_address(index).map(|address| unsafe { &mut *(address as *mut _) })
+    }
+
+    pub fn next_table_create<A>(&mut self, index: usize, allocator: &mut A) -> &mut Table<L::NextLevel>
+        where A: FrameAllocator
+    {
+        if self.next_table(index).is_none() {
+            assert!(!self.entries[index].flags().contains(HUGE_PAGE),
+                    "mapping code does not support huge pages");
+            let frame = allocator.allocate_frame().expect("no frames available");
+            self.entries[index].set(frame, PRESENT | WRITABLE);
+            self.next_table_mut(index).unwrap().zero();
+        }
+        self.next_table_mut(index).unwrap()
+    }
+
+    fn next_table_address(&self, index: usize) -> Option<usize> {
+        let entry_flags = self[index].flags();
+        if entry_flags.contains(PRESENT) && !entry_flags.contains(HUGE_PAGE) {
+            let table_address = self as *const _ as usize;
+            Some((table_address << 9) | (index << 12))
+        } else {
+            None
+        }
+    }
+}
+
+impl<L> Index<usize> for Table<L> where L: TableLevel {
+    type Output = Entry;
+
+    fn index(&self, index: usize) -> &Entry {
+        &self.entries[index]
+    }
+}
+
+impl<L> IndexMut<usize> for Table<L> where L: TableLevel {
+    fn index_mut(&mut self, index: usize) -> &mut Entry {
+        &mut self.entries[index]
+    }
+}

arch/x86_64/src/physical.rs

@@ -1,11 +0,0 @@
-//! Typestrong address segregation.
-
-/// A physical address in memory.
-#[derive(Clone, Debug, PartialEq, Eq)]
-pub struct Physical {
-    /// The position.
-    ///
-    /// Note that we do not use a pointer here to avoid simple mistakes where the programmer
-    /// confuse virtual and physical.
-    pub inner: u64,
-}

bootloader/x86/startup-x86_64.asm

@@ -17,6 +17,8 @@ startup_arch:
     ;Link first PML4 to PDP
     mov DWORD [es:edi], 0x71000 | 1 << 1 | 1
     add edi, 0x1000
+    ;Link last PML4 to PML4
+    mov DWORD [es:edi - 8], 0x70000 | 1 << 1 | 1
     ;Link first PDP to PD
     mov DWORD [es:edi], 0x72000 | 1 << 1 | 1
     add edi, 0x1000

kernel/paging/mod.rs

@@ -1,6 +0,0 @@
-/// A newtype representing a virtual address.
-#[derive(Copy, Clone, Debug, Eq, Ord, PartialEq, PartialOrd)]
-pub struct Virtual {
-    /// The inner value.
-    pub inner: usize,
-}

kernel/panic.rs

@@ -9,7 +9,7 @@ extern "C" fn eh_personality() {}
 #[cfg(not(test))]
 /// Required to handle panics
 #[lang = "panic_fmt"]
-extern "C" fn panic_fmt() -> ! {
+extern "C" fn panic_fmt(fmt: ::core::fmt::Arguments, file_line: &(&'static str, u32)) -> ! {
     loop {
         unsafe { halt() };
     }

rust

@@ -0,0 +1 @@
+Subproject commit b72fa8ca95c02e4b44b216a425fd563ad2ef58bb

rustc.sh

@@ -0,0 +1,2 @@
+#!/bin/bash
+RUST_BACKTRACE=1 rustc -L build $*

x86_64-unknown-none.json

@@ -9,7 +9,7 @@
     "vendor": "unknown",
     "target-family": "redox",
     "pre-link-args": ["-m64", "-nostdlib", "-static"],
-    "features": "-sse3,-ssse3,-sse4.1,-sse4.2,-3dnow,-3dnowa,-avx,-avx2",
+    "features": "-mmx,-sse,-sse2,-sse3,-ssse3,-sse4.1,-sse4.2,-3dnow,-3dnowa,-avx,-avx2,+soft-float",
     "dynamic-linking": false,
     "executables": false,
     "relocation-model": "static",