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https://github.com/phil-opp/blog_os.git
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@@ -115,14 +115,14 @@ pub fn init(memory_controller: &mut MemoryController) {
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use x86::shared::segmentation::{SegmentSelector, set_cs};
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use x86::shared::task::load_tr;
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let double_fault_stack = memory_controller.alloc_stack(1)
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.expect("could not allocate double fault stack");
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let double_fault_stack =
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memory_controller.alloc_stack(1).expect("could not allocate double fault stack");
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let tss = TSS.call_once(|| {
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let mut tss = TaskStateSegment::new();
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tss.ist[DOUBLE_FAULT_IST_INDEX] = double_fault_stack.top() as u64;
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tss
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});
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let mut tss = TaskStateSegment::new();
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tss.ist[DOUBLE_FAULT_IST_INDEX] = double_fault_stack.top() as u64;
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tss
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});
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let mut code_selector = SegmentSelector::empty();
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let mut tss_selector = SegmentSelector::empty();
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@@ -49,9 +49,9 @@ impl AreaFrameAllocator {
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self.current_area = self.areas
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.clone()
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.filter(|area| {
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let address = area.base_addr + area.length - 1;
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Frame::containing_address(address as usize) >= self.next_free_frame
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})
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let address = area.base_addr + area.length - 1;
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Frame::containing_address(address as usize) >= self.next_free_frame
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})
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.min_by_key(|area| area.base_addr);
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if let Some(area) = self.current_area {
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@@ -32,8 +32,11 @@ impl Mapper {
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pub fn translate(&self, virtual_address: VirtualAddress) -> Option<PhysicalAddress> {
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let offset = virtual_address % PAGE_SIZE;
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self.translate_page(Page::containing_address(virtual_address))
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.map(|frame| frame.number * PAGE_SIZE + offset)
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self.translate_page(Page::containing_address(virtual_address)).map(|frame| {
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frame.number *
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PAGE_SIZE +
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offset
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})
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}
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pub fn translate_page(&self, page: Page) -> Option<Frame> {
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@@ -48,9 +51,9 @@ impl Mapper {
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// address must be 1GiB aligned
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assert!(start_frame.number % (ENTRY_COUNT * ENTRY_COUNT) == 0);
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return Some(Frame {
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number: start_frame.number + page.p2_index() * ENTRY_COUNT +
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page.p1_index(),
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});
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number: start_frame.number + page.p2_index() * ENTRY_COUNT +
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page.p1_index(),
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});
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}
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}
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if let Some(p2) = p3.next_table(page.p3_index()) {
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@@ -188,8 +188,7 @@ pub fn remap_the_kernel<A>(allocator: &mut A, boot_info: &BootInformation) -> Ac
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};
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active_table.with(&mut new_table, &mut temporary_page, |mapper| {
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let elf_sections_tag = boot_info.elf_sections_tag()
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.expect("Memory map tag required");
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let elf_sections_tag = boot_info.elf_sections_tag().expect("Memory map tag required");
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// identity map the allocated kernel sections
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for section in elf_sections_tag.sections() {
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@@ -44,13 +44,11 @@ impl<L> Table<L>
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}
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pub fn next_table(&self, index: usize) -> Option<&Table<L::NextLevel>> {
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self.next_table_address(index)
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.map(|address| unsafe { &*(address as *const _) })
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self.next_table_address(index).map(|address| unsafe { &*(address as *const _) })
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}
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pub fn next_table_mut(&mut self, index: usize) -> Option<&mut Table<L::NextLevel>> {
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self.next_table_address(index)
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.map(|address| unsafe { &mut *(address as *mut _) })
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self.next_table_address(index).map(|address| unsafe { &mut *(address as *mut _) })
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}
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pub fn next_table_create<A>(&mut self,
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@@ -16,10 +16,11 @@ const BUFFER_HEIGHT: usize = 25;
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const BUFFER_WIDTH: usize = 80;
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pub static WRITER: Mutex<Writer> = Mutex::new(Writer {
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column_position: 0,
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color_code: ColorCode::new(Color::LightGreen, Color::Black),
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buffer: unsafe { Unique::new(0xb8000 as *mut _) },
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});
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column_position: 0,
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color_code: ColorCode::new(Color::LightGreen,
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Color::Black),
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buffer: unsafe { Unique::new(0xb8000 as *mut _) },
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});
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macro_rules! println {
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($fmt:expr) => (print!(concat!($fmt, "\n")));
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@@ -85,9 +86,9 @@ impl Writer {
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let color_code = self.color_code;
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self.buffer().chars[row][col].write(ScreenChar {
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ascii_character: byte,
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color_code: color_code,
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});
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ascii_character: byte,
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color_code: color_code,
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});
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self.column_position += 1;
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}
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}
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