Most of post-12

This commit is contained in:
Timothy Warren 2020-05-12 16:51:22 -04:00
parent 22818dca6c
commit 396076eb75
10 changed files with 415 additions and 160 deletions

218
Cargo.lock generated
View File

@ -1,12 +1,9 @@
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View File

@ -7,17 +7,31 @@ edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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x86_64 = "0.9.6"
[dependencies.conquer-once]
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default-features = false
[dependencies.crossbeam-queue]
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default-features = false
features = ["alloc"]
[dependencies.futures-util]
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[dependencies.lazy_static]
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features = ["spin_no_std"]
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View File

@ -38,7 +38,7 @@ unsafe impl GlobalAlloc for Dummy {
pub fn init_heap(
mapper: &mut impl Mapper<Size4KiB>,
frame_allocator: &mut impl FrameAllocator<Size4KiB>,
) -> Result<(), MapToError> {
) -> Result<(), MapToError<Size4KiB>> {
let page_range = {
let heap_start = VirtAddr::new(HEAP_START as u64);
let head_end = heap_start + HEAP_SIZE - 1u64;

View File

@ -10,6 +10,12 @@ use crate::{print, println};
#[cfg(test)]
use crate::{serial_print, serial_println};
pub const PIC_1_OFFSET: u8 = 32;
pub const PIC_2_OFFSET: u8 = PIC_1_OFFSET + 8;
pub static PICS: spin::Mutex<ChainedPics> =
spin::Mutex::new(unsafe { ChainedPics::new(PIC_1_OFFSET, PIC_2_OFFSET) });
lazy_static! {
static ref IDT: InterruptDescriptorTable = {
let mut idt = InterruptDescriptorTable::new();
@ -39,9 +45,8 @@ extern "x86-interrupt" fn breakpoint_handler(stack_frame: &mut InterruptStackFra
extern "x86-interrupt" fn double_fault_handler(
stack_frame: &mut InterruptStackFrame,
_error_code: u64,
) {
println!("EXCEPTION: DOUBLE FAULT\n{:#?}", stack_frame);
hlt_loop();
) -> ! {
panic!("EXCEPTION: DOUBLE FAULT\n{:#?}", stack_frame);
}
extern "x86-interrupt" fn timer_interrupt_handler(_stack_frame: &mut InterruptStackFrame) {
@ -53,34 +58,12 @@ extern "x86-interrupt" fn timer_interrupt_handler(_stack_frame: &mut InterruptSt
}
}
pub const PIC_1_OFFSET: u8 = 32;
pub const PIC_2_OFFSET: u8 = PIC_1_OFFSET + 8;
pub static PICS: spin::Mutex<ChainedPics> =
spin::Mutex::new(unsafe { ChainedPics::new(PIC_1_OFFSET, PIC_2_OFFSET) });
extern "x86-interrupt" fn keyboard_interrupt_handler(_stack_frame: &mut InterruptStackFrame) {
use pc_keyboard::{layouts, DecodedKey, Keyboard, ScancodeSet1};
use spin::Mutex;
use x86_64::instructions::port::Port;
lazy_static! {
static ref KEYBOARD: Mutex<Keyboard<layouts::Us104Key, ScancodeSet1>> =
Mutex::new(Keyboard::new(layouts::Us104Key, ScancodeSet1));
}
let mut keyboard = KEYBOARD.lock();
let mut port = Port::new(0x60); // PS/2 port
let scancode: u8 = unsafe { port.read() };
if let Ok(Some(key_event)) = keyboard.add_byte(scancode) {
if let Some(key) = keyboard.process_keyevent(key_event) {
match key {
DecodedKey::Unicode(character) => print!("{}", character),
DecodedKey::RawKey(key) => print!("{:?}", key),
}
}
}
crate::task::keyboard::add_scancode(scancode);
unsafe {
PICS.lock()

View File

@ -12,7 +12,6 @@
extern crate alloc;
use core::panic::PanicInfo;
use linked_list_allocator::LockedHeap;
#[cfg(test)]
use bootloader::{entry_point, BootInfo};
@ -20,9 +19,6 @@ use bootloader::{entry_point, BootInfo};
#[cfg(test)]
entry_point!(test_kernel_main);
// #[global_allocator]
// static ALLOCATOR: LockedHeap = LockedHeap::empty();
#[alloc_error_handler]
fn alloc_error_handler(layout: alloc::alloc::Layout) -> ! {
panic!("allocation error: {:?}", layout)
@ -34,6 +30,7 @@ pub mod interrupts;
pub mod macros;
pub mod memory;
pub mod serial;
pub mod task;
pub mod vga_buffer;
pub fn test_runner(tests: &[&dyn Fn()]) {

View File

@ -10,6 +10,7 @@ use alloc::{boxed::Box, rc::Rc, vec, vec::Vec};
use core::panic::PanicInfo;
use blog_os::println;
use blog_os::task::{keyboard, Task, simple_executor::SimpleExecutor};
use bootloader::{entry_point, BootInfo};
/// This function is called on panic.
@ -65,9 +66,23 @@ fn kernel_main(boot_info: &'static BootInfo) -> ! {
Rc::strong_count(&cloned_reference)
);
let mut executor = SimpleExecutor::new();
executor.spawn(Task::new(example_task()));
executor.spawn(Task::new(keyboard::print_keypresses()));
executor.run();
#[cfg(test)]
test_main();
println!("It did not crash!");
blog_os::hlt_loop();
}
async fn async_number() -> u32 {
42
}
async fn example_task() {
let number = async_number().await;
println!("async number: {}", number);
}

View File

@ -2,63 +2,12 @@ use bootloader::bootinfo::{MemoryMap, MemoryRegionType};
use x86_64::{
structures::paging::{
FrameAllocator, Mapper, OffsetPageTable, Page, PageTable, PhysFrame, Size4KiB,
UnusedPhysFrame,
},
PhysAddr, VirtAddr,
};
/// A FrameAllocator that always returns `None`.
pub struct EmptyFrameAllocator;
unsafe impl FrameAllocator<Size4KiB> for EmptyFrameAllocator {
fn allocate_frame(&mut self) -> Option<PhysFrame> {
None
}
}
pub struct BootInfoFrameAllocator {
memory_map: &'static MemoryMap,
next: usize,
}
impl BootInfoFrameAllocator {
/// Create a FrameAllocator from the passed memory map.
///
/// This function is unsafe because the caller must guarantee that the passed
/// meory map is valid. The main requirement is that all frame are marked
/// as `USABLE` in it are really unused.
pub unsafe fn init(memory_map: &'static MemoryMap) -> Self {
BootInfoFrameAllocator {
memory_map,
next: 0,
}
}
/// Returns an iterator over the usable frames specified in the memory map.
fn usable_frames(&self) -> impl Iterator<Item = PhysFrame> {
// get usable regions from memory map
let regions = self.memory_map.iter();
let usable_regions = regions.filter(|r| r.region_type == MemoryRegionType::Usable);
// map each region to its address range
let addr_ranges = usable_regions.map(|r| r.range.start_addr()..r.range.end_addr());
// transform to an iterator of frame start addresses
let frame_addresses = addr_ranges.flat_map(|r| r.step_by(4096));
// create `PhysFrame` types from the start addresses
frame_addresses.map(|addr| PhysFrame::containing_address(PhysAddr::new(addr)))
}
}
unsafe impl FrameAllocator<Size4KiB> for BootInfoFrameAllocator {
fn allocate_frame(&mut self) -> Option<PhysFrame> {
let frame = self.usable_frames().nth(self.next);
self.next += 1;
frame
}
}
/// Initialize a new OffsetPageTable
/// Initialize a new OffsetPageTable.
///
/// This function is unsafe because the caller must guarantee that the
/// complete physical memory is mapped to virtual memory at the passed
@ -84,10 +33,10 @@ unsafe fn active_level_4_table(physical_memory_offset: VirtAddr) -> &'static mut
let virt = physical_memory_offset + phys.as_u64();
let page_table_ptr: *mut PageTable = virt.as_mut_ptr();
&mut *page_table_ptr
&mut *page_table_ptr // unsafe
}
/// Creates an example maping for the given page to frame `0xb8000`
/// Creates an example mapping for the given page to frame `0xb8000`.
pub fn create_example_mapping(
page: Page,
mapper: &mut OffsetPageTable,
@ -96,9 +45,62 @@ pub fn create_example_mapping(
use x86_64::structures::paging::PageTableFlags as Flags;
let frame = PhysFrame::containing_address(PhysAddr::new(0xb8000));
// FIXME: ONLY FOR TEMPORARY TESTING
let unused_frame = unsafe { UnusedPhysFrame::new(frame) };
let flags = Flags::PRESENT | Flags::WRITABLE;
let map_to_result = unsafe { mapper.map_to(page, frame, flags, frame_allocator) };
let map_to_result = mapper.map_to(page, unused_frame, flags, frame_allocator);
map_to_result.expect("map_to failed").flush();
}
/// A FrameAllocator that always returns `None`.
pub struct EmptyFrameAllocator;
unsafe impl FrameAllocator<Size4KiB> for EmptyFrameAllocator {
fn allocate_frame(&mut self) -> Option<UnusedPhysFrame> {
None
}
}
/// A FrameAllocator that returns usable frames from the bootloader's memory map.
pub struct BootInfoFrameAllocator {
memory_map: &'static MemoryMap,
next: usize,
}
impl BootInfoFrameAllocator {
/// Create a FrameAllocator from the passed memory map.
///
/// This function is unsafe because the caller must guarantee that the passed
/// memory map is valid. The main requirement is that all frames that are marked
/// as `USABLE` in it are really unused.
pub unsafe fn init(memory_map: &'static MemoryMap) -> Self {
BootInfoFrameAllocator {
memory_map,
next: 0,
}
}
/// Returns an iterator over the usable frames specified in the memory map.
fn usable_frames(&self) -> impl Iterator<Item = UnusedPhysFrame> {
// get usable regions from memory map
let regions = self.memory_map.iter();
let usable_regions = regions.filter(|r| r.region_type == MemoryRegionType::Usable);
// map each region to its address range
let addr_ranges = usable_regions.map(|r| r.range.start_addr()..r.range.end_addr());
// transform to an iterator of frame start addresses
let frame_addresses = addr_ranges.flat_map(|r| r.step_by(4096));
// create `PhysFrame` types from the start addresses
let frames = frame_addresses.map(|addr| PhysFrame::containing_address(PhysAddr::new(addr)));
// we know that the frames are really unused
frames.map(|f| unsafe { UnusedPhysFrame::new(f) })
}
}
unsafe impl FrameAllocator<Size4KiB> for BootInfoFrameAllocator {
fn allocate_frame(&mut self) -> Option<UnusedPhysFrame> {
let frame = self.usable_frames().nth(self.next);
self.next += 1;
frame
}
}

35
src/task.rs Normal file
View File

@ -0,0 +1,35 @@
use core::{future::Future, pin::Pin};
use core::sync::atomic::{AtomicU64, Ordering};
use core::task::{Context, Poll};
use alloc::boxed::Box;
pub mod keyboard;
pub mod simple_executor;
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord)]
struct TaskId(u64);
impl TaskId {
fn new() -> Self {
static NEXT_ID: AtomicU64 = AtomicU64::new(0);
TaskId(NEXT_ID.fetch_add(1, Ordering::Relaxed))
}
}
pub struct Task {
id: TaskId,
future: Pin<Box<dyn Future<Output = ()>>>,
}
impl Task {
pub fn new(future: impl Future<Output = ()> + 'static) -> Task {
Task {
id: TaskId::new(),
future: Box::pin(future),
}
}
fn poll(&mut self, context: &mut Context) -> Poll<()> {
self.future.as_mut().poll(context)
}
}

81
src/task/keyboard.rs Normal file
View File

@ -0,0 +1,81 @@
use conquer_once::spin::OnceCell;
use core::{pin::Pin, task::{Poll, Context}};
use crossbeam_queue::ArrayQueue;
use futures_util::task::AtomicWaker;
use futures_util::stream::{Stream, StreamExt};
use pc_keyboard::{layouts, DecodedKey, HandleControl, Keyboard, ScancodeSet1};
use crate::{print, println};
static SCANCODE_QUEUE: OnceCell<ArrayQueue<u8>> = OnceCell::uninit();
static WAKER: AtomicWaker = AtomicWaker::new();
/// Called by the keyboard interrupt handler
///
/// Must not block or allocate.
pub(crate) fn add_scancode(scancode: u8) {
if let Ok(queue) = SCANCODE_QUEUE.try_get() {
if let Err(_) = queue.push(scancode) {
println!("WARNING: scancode queue full; dropping keyboard input");
} else {
WAKER.wake();
}
} else {
println!("WARNING: scancode queue uninitialized");
}
}
pub async fn print_keypresses() {
let mut scancodes = ScancodeStream::new();
let mut keyboard = Keyboard::new(layouts::Us104Key, ScancodeSet1, HandleControl::Ignore);
while let Some(scancode) = scancodes.next().await {
if let Ok(Some(key_event)) = keyboard.add_byte(scancode) {
if let Some(key) = keyboard.process_keyevent(key_event) {
match key {
DecodedKey::Unicode(character) => print!("{}", character),
DecodedKey::RawKey(key) => print!("{:?}", key),
}
}
}
}
}
pub struct ScancodeStream {
_private: (),
}
impl ScancodeStream {
pub fn new() -> Self {
SCANCODE_QUEUE.try_init_once(|| ArrayQueue::new(100))
.expect("ScancodeStream::new should only be called once");
ScancodeStream {
_private: ()
}
}
}
impl Stream for ScancodeStream {
type Item = u8;
fn poll_next(self: Pin<&mut Self>, cx: &mut Context) -> Poll<Option<u8>> {
let queue = SCANCODE_QUEUE
.try_get()
.expect("not initialized");
// fast path
if let Ok(scancode) = queue.pop() {
return Poll::Ready(Some(scancode));
}
WAKER.register(&cx.waker());
match queue.pop() {
Ok(scancode) => {
WAKER.take();
Poll::Ready(Some(scancode))
},
Err(crossbeam_queue::PopError) => Poll::Pending,
}
}
}

View File

@ -0,0 +1,44 @@
use super::Task;
use alloc::collections::VecDeque;
use core::task::{Context, Poll, Waker, RawWaker, RawWakerVTable};
pub struct SimpleExecutor {
task_queue: VecDeque<Task>,
}
impl SimpleExecutor {
pub fn new() -> SimpleExecutor {
SimpleExecutor {
task_queue: VecDeque::new(),
}
}
pub fn spawn(&mut self, task: Task) {
self.task_queue.push_back(task)
}
pub fn run(&mut self) {
while let Some(mut task) = self.task_queue.pop_front() {
let waker = dummy_waker();
let mut context = Context::from_waker(&waker);
match task.poll(&mut context) {
Poll::Ready(()) => {} // task done
Poll::Pending => self.task_queue.push_back(task),
}
}
}
}
fn dummy_raw_waker() -> RawWaker {
fn no_op(_: *const ()) {}
fn clone(_: *const ()) -> RawWaker {
dummy_raw_waker()
}
let vtable = &RawWakerVTable::new(clone, no_op, no_op, no_op);
RawWaker::new(0 as *const (), vtable)
}
fn dummy_waker() -> Waker {
unsafe { Waker::from_raw(dummy_raw_waker()) }
}