minor changes & work on threading

docs/Planning & To-Dos.md

@@ -7,12 +7,17 @@
 > 	- [ ] write a script to run tests
 > 	- [ ] a release should only be published if all tests pass
 
+> [!todo] Memory
+> - [ ] make sure page tables are correct. we're still getting the annoying page fault errors for the APIC
+> - [ ] page allocator
+>   - [ ] e
+
 > [!todo] Allocator
-> - [ ] learn about several allocator designs and decide on the optimal one
+> - [x] learn about several allocator designs and decide on the optimal one
-> - [ ] implementation
+> - [x] implementation
-> 	- [ ] implement an allocate method
+> 	- [x] implement an allocate method
-> 	- [ ] implement a deallocate method
+> 	- [x] implement a deallocate method
-> 	- [ ] set the global allocator
+> 	- [x] set the global allocator
 > - [ ] testing
 > 	- [ ] write unit tests
 > 		- [ ] many allocations

kernel/src/arch/x86_64/memory/allocation/stack_alloc.rs

@@ -19,6 +19,10 @@ pub unsafe fn alloc_stack(
 ) -> Result<StackBounds, mapper::MapToError<Size4KiB>> { unsafe {
     use x86_64::structures::paging::PageTableFlags as Flags;
 
+
+
+
+
     let guard_page = reserve_stack_memory(size_in_pages + 1);
     let stack_start = guard_page + 1;
     let stack_end = stack_start + size_in_pages;

kernel/src/arch/x86_64/memory/mod.rs

@@ -58,24 +58,18 @@ pub struct FoundryOSFrameAllocator {
     next: usize,
 }
 
-pub fn init_frame_allocator(memory_map: &'static MemoryMapResponse) {
-    unsafe {
-        FRAME_ALLOCATOR.call_once(|| Mutex::new(FoundryOSFrameAllocator::init(memory_map)));
-    }
-}
-
 impl FoundryOSFrameAllocator {
     /// Creates a new `FoundryOSFrameAllocator` from a memory map.
     ///
     /// This function takes a reference to a `MemoryMapResponse` and initializes a
     /// `FoundryOSFrameAllocator` with it. The `next` field is set to 0, indicating that
     /// the first frame to be allocated is the first frame in the memory map.
-    pub const unsafe fn init(memory_map: &'static MemoryMapResponse) -> Self {
+    pub unsafe fn init(memory_map: &'static MemoryMapResponse) { unsafe {
-        Self {
+        FRAME_ALLOCATOR.call_once(|| Mutex::new(Self {
             memory_map,
             next: 0,
-        }
+        }));
-    }
+    }}
 
     pub fn count_usable_frames(&self) -> u32 {
         self.usable_frames().count() as u32
@@ -89,11 +83,8 @@ impl FoundryOSFrameAllocator {
     fn usable_frames(&self) -> impl Iterator<Item = PhysFrame> + use<> {
         let regions = self.memory_map.entries().iter();
         let usable_regions = regions.filter(|region| region.entry_type == EntryType::USABLE);
-
         let addr_ranges = usable_regions.map(|region| region.base..region.base + region.length);
-
         let frame_addresses = addr_ranges.flat_map(|r| r.step_by(4096));
-
         frame_addresses.map(|addr| PhysFrame::from_start_address(PhysAddr::new(addr)).unwrap())
     }
 }
@@ -114,36 +105,4 @@ unsafe impl FrameAllocator<Size4KiB> for FoundryOSFrameAllocator {
         self.next += 1;
         frame
     }
-}
+}
-
-// pub unsafe fn translate_addr(addr: VirtAddr, physical_memory_offset: VirtAddr) -> Option<PhysAddr> {
-//     translate_addr_inner(addr, physical_memory_offset)
-// }
-
-// fn translate_addr_inner(addr: VirtAddr, physical_memory_offset: VirtAddr) -> Option<PhysAddr> {
-//     let (l4_table_frame, _) = Cr3::read();
-
-//     let table_indexes = [
-//         addr.p4_index(),
-//         addr.p3_index(),
-//         addr.p2_index(),
-//         addr.p1_index(),
-//     ];
-//     let mut frame = l4_table_frame;
-
-//     for &i in &table_indexes {
-//         let virt = physical_memory_offset + frame.start_address().as_u64();
-//         let table_ptr: *const PageTable = virt.as_ptr();
-//         let table = unsafe { &*table_ptr };
-
-//         let entry = &table[i];
-
-//         frame = match entry.frame() {
-//             Ok(frame) => frame,
-//             Err(FrameError::FrameNotPresent) => return None,
-//             Err(FrameError::HugeFrame) => panic!("huge frames are not supported!"),
-//         };
-//     }
-
-//     Some(frame.start_address() + u64::from(addr.page_offset()))
-// }

kernel/src/arch/x86_64/processing/mod.rs

@@ -1,2 +1,3 @@
 pub mod async_io;
 pub mod threading;
+mod taskrunner;

kernel/src/arch/x86_64/processing/taskrunner/mod.rs

@@ -0,0 +1,12 @@
+use alloc::boxed::Box;
+
+pub struct Task {
+    pid: usize,
+    task: Box<dyn Fn() + Send + 'static>,
+}
+
+impl Task {
+    pub fn new() {}
+
+    pub fn run() {}
+}

kernel/src/lib.rs

@@ -13,7 +13,7 @@
 
 extern crate alloc;
 use crate::{
-    arch::x86_64::memory::{init_frame_allocator, init_page_table},
+    arch::x86_64::memory::init_page_table,
     prelude::*,
 };
 use arch::x86_64::memory::allocation::heap_alloc::init_heap;
@@ -21,6 +21,7 @@ use arch::x86_64::memory::memory_map;
 use core::arch::asm;
 use limine::BaseRevision;
 use x86_64::VirtAddr;
+use crate::arch::x86_64::memory::FoundryOSFrameAllocator;
 
 pub mod arch;
 pub mod resources;
@@ -89,7 +90,7 @@ pub fn boot() -> Result<(), &'static str> {
     println_log!("[Success]");
 
     print_log!("    Setting Up Page Table... ");
-    init_frame_allocator(memory_map);
+    unsafe { FoundryOSFrameAllocator::init(memory_map) };
     println_log!("[Success]");
 
     print_log!("    Initialising Heap... ");

kernel/src/std/application.rs

@@ -8,7 +8,7 @@ pub mod window;
 pub trait Application {
     type Output;
 
-    async fn run(&mut self, args: Vec<String>) -> Result<Self::Output, Error>;
+    fn run(&mut self, args: Vec<String>) -> impl Future<Output = Result<Self::Output, Error>> + Send;
 }
 
 #[derive(Debug)]

libm/src/lib.rs

@@ -47,6 +47,32 @@ pub fn include_font(item: TokenStream) -> TokenStream {
 
 struct Font([[u8; 16]; 512]);
 
+struct FontData {
+    width: u8,
+    height: u8,
+    length: u16,
+    data: Vec<Glyph>,
+    unicode_table: [[u8; 2]; 512],
+}
+
+struct Glyph {
+    bytes: Vec<u8>,
+}
+
+enum FontBuilder {
+    Psf1,
+    Psf2,
+}
+
+impl FontBuilder {
+    const PSF1_MAGIC: u16 = 0x3604;
+    const PSF2_MAGIC: u32 = 0x72b54a86;
+
+    pub fn load() -> Option<Self> {
+        None
+    }
+}
+
 impl Font {
     const MAGIC: u16 = 0x3604;