{"header":{"message":"Implement heap allocation","description":"Basic kernel heap allocation, heavily influenced by this blog: https://os.phil-opp.com/#memory-management. The most exciting possibility this (immediately) enables is using the `tracing` crate in the kernel.","timestamp":"2023-12-29T17:38:39.540007992Z","authors":[{}]},"hash":"SCGTKLIL3L6BITCIP2PGKSCJD2XQ2LKQWN63SWQXSELVGVZYMI3AC","authors":[{"login":"finchie","key":"6WCsL9cxQoPBLLwR1PUvmFBJi6wGTGFAxcxMovPQCwTZ"}],"deps":{"hashes":[["SCGTKLIL3L6BITCIP2PGKSCJD2XQ2LKQWN63SWQXSELVGVZYMI3AC","Implement heap allocation"],["AA",null],["QJPM62J2AY4RISVQIIKS33OK6QUBUHYILETWZ42CSDA77PN2VU4AC","Implement double-fault handling"],["K5LGXRU2WR2E3V35X37CVLWAU7UGVRQ22JAUYIDCFNP7JHHUIU7AC","Create simple kernel toolchain"]],"deps":["QJPM62J2AY4RISVQIIKS33OK6QUBUHYILETWZ42CSDA77PN2VU4AC"],"known":["K5LGXRU2WR2E3V35X37CVLWAU7UGVRQ22JAUYIDCFNP7JHHUIU7AC"]},"hunks":[{"FileAdd":{"meta":{"basename":"memory.rs","metadata":0},"context":[{"change":3,"pos":1903}],"contents":[{"Add":"use bootloader_api::info::{MemoryRegionKind, MemoryRegions};"},{"Add":"use x86_64::addr::{PhysAddr, VirtAddr};"},{"Add":"use x86_64::registers::control::Cr3;"},{"Add":"use x86_64::structures::paging::{"},{"Add":" FrameAllocator, OffsetPageTable, PageSize, PageTable, PhysFrame, Size4KiB,"},{"Add":"};"},{"Add":""},{"Add":"// Not sure how to get the configured page size, but pretty sure it's only 4kib by default"},{"Add":"// TODO: check if this is true and enable 64-bit pages"},{"Add":"static PAGE_SIZE: u64 = Size4KiB::SIZE;"},{"Add":""},{"Add":"pub struct SimpleFrameAllocator"},{"Add":"where"},{"Add":" I: Iterator,"},{"Add":"{"},{"Add":" pub usable_frames: I,"},{"Add":"}"},{"Add":""},{"Add":"// TODO: increase page size here as well"},{"Add":"unsafe impl FrameAllocator for SimpleFrameAllocator"},{"Add":"where"},{"Add":" I: Iterator,"},{"Add":"{"},{"Add":" fn allocate_frame(&mut self) -> Option> {"},{"Add":" self.usable_frames.next()"},{"Add":" }"},{"Add":"}"},{"Add":""},{"Add":"/// Caller must ensure memory map is valid"},{"Add":"pub unsafe fn init_frame_allocator("},{"Add":" memory_regions: &'static MemoryRegions,"},{"Add":") -> SimpleFrameAllocator> {"},{"Add":" // Collect all physical frames marked as usable"},{"Add":" let usable_frames = memory_regions"},{"Add":" .iter()"},{"Add":" // Filter to only usable frames"},{"Add":" .filter(|region| region.kind == MemoryRegionKind::Usable)"},{"Add":" // Map to start+end range"},{"Add":" .map(|region| region.start..region.end)"},{"Add":" // Collect all pages in region"},{"Add":" .flat_map(|region| region.step_by(PAGE_SIZE as usize))"},{"Add":" // Map to start address"},{"Add":" .map(|start_address| PhysFrame::containing_address(PhysAddr::new(start_address)));"},{"Add":""},{"Add":" SimpleFrameAllocator { usable_frames }"},{"Add":"}"},{"Add":""},{"Add":"/// Get the current active level 4 page table"},{"Add":"unsafe fn active_level_4_table(physical_memory_offset: VirtAddr) -> &'static mut PageTable {"},{"Add":" let (physical_frame, _flags) = Cr3::read();"},{"Add":""},{"Add":" let frame_physical_address = physical_frame.start_address();"},{"Add":" let frame_virtual_address = physical_memory_offset + frame_physical_address.as_u64();"},{"Add":" let page_table_address = frame_virtual_address.as_mut_ptr();"},{"Add":""},{"Add":" &mut *page_table_address"},{"Add":"}"},{"Add":""},{"Add":"pub unsafe fn init(physical_memory_offset: VirtAddr) -> OffsetPageTable<'static> {"},{"Add":" let active_table = active_level_4_table(physical_memory_offset);"},{"Add":""},{"Add":" OffsetPageTable::new(active_table, physical_memory_offset)"},{"Add":"}"}]}},{"Edit":{"inode":{"change":3,"pos":1937},"path":"kernel/src/main.rs","line":5,"atom":{"NewVertex":{"up_context":[{"change":2,"pos":32}],"down_context":[{"change":2,"pos":32}],"flag":"BLOCK","start":2256,"end":2271,"inode":{"change":3,"pos":1937}}},"contents":[{"Add":"mod 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init();\n"}]}},{"Replacement":{"inode":{"change":3,"pos":1937},"path":"kernel/src/main.rs","line":30,"ins":{"up_context":[{"change":3,"pos":2140}],"down_context":[{"change":2,"pos":84}],"flag":"BLOCK","start":2691,"end":2735,"inode":{"change":3,"pos":1937}},"del":{"edges":[{"previous":"BLOCK","flag":"BLOCK | DELETED","from":{"change":3,"pos":2140},"to":{"change":2,"start":72,"end":84},"introduced_by":2}],"inode":{"change":3,"pos":1937}},"ins_contents":[{"Add":"fn init(boot_info: &'static mut BootInfo) {"}],"del_contents":[{"Del":"fn init() {\n"}]}},{"Edit":{"inode":{"change":3,"pos":1937},"path":"kernel/src/main.rs","line":33,"atom":{"NewVertex":{"up_context":[{"change":2,"pos":125}],"down_context":[{"change":2,"pos":125}],"flag":"BLOCK","start":2736,"end":3133,"inode":{"change":3,"pos":1937}}},"contents":[{"Add":" let mut offset_table = unsafe {"},{"Add":" memory::init(VirtAddr::new("},{"Add":" boot_info"},{"Add":" .physical_memory_offset"},{"Add":" .into_option()"},{"Add":" .unwrap_or_default(),"},{"Add":" ))"},{"Add":" };"},{"Add":""},{"Add":" let mut frame_allocator = unsafe { memory::init_frame_allocator(&boot_info.memory_regions) };"},{"Add":""},{"Add":" allocator::init_heap(&mut offset_table, &mut frame_allocator).unwrap();"}]}},{"FileAdd":{"meta":{"basename":"allocator.rs","metadata":0},"context":[{"change":3,"pos":1903}],"contents":[{"Add":"use linked_list_allocator::LockedHeap;"},{"Add":"use x86_64::structures::paging::mapper::MapToError;"},{"Add":"use x86_64::structures::paging::{FrameAllocator, Mapper, Page, PageTableFlags, Size4KiB};"},{"Add":"use x86_64::VirtAddr;"},{"Add":""},{"Add":"#[global_allocator]"},{"Add":"static ALLOCATOR: LockedHeap = LockedHeap::empty();"},{"Add":""},{"Add":"// TODO: choose a better start address"},{"Add":"pub const HEAP_START: usize = 0x_2222_0000_0000;"},{"Add":"pub const HEAP_SIZE: usize = 512 * 1024; // 500 KiB"},{"Add":""},{"Add":"/// Initialize the kernel heap"},{"Add":"pub fn init_heap("},{"Add":" mapper: &mut impl Mapper,"},{"Add":" frame_allocator: &mut impl FrameAllocator,"},{"Add":") -> Result<(), MapToError> {"},{"Add":" let heap_start = VirtAddr::new(HEAP_START as u64);"},{"Add":" let heap_end = heap_start + HEAP_SIZE - 1u64;"},{"Add":""},{"Add":" // Get the pages between start & end adresses (inclusive)"},{"Add":" let page_range = {"},{"Add":" // TODO: larger page sizes"},{"Add":" let start_page: Page = Page::containing_address(heap_start);"},{"Add":" let end_page = Page::containing_address(heap_end);"},{"Add":" Page::range_inclusive(start_page, end_page)"},{"Add":" };"},{"Add":""},{"Add":" // Map pages to be usable later"},{"Add":" for page in page_range {"},{"Add":" let frame = frame_allocator"},{"Add":" .allocate_frame()"},{"Add":" .ok_or(MapToError::FrameAllocationFailed)?;"},{"Add":""},{"Add":" let page_flags = PageTableFlags::PRESENT | PageTableFlags::WRITABLE;"},{"Add":" unsafe { mapper.map_to(page, frame, page_flags, frame_allocator) }?.flush();"},{"Add":" }"},{"Add":""},{"Add":" // Initialize the allocator"},{"Add":" unsafe {"},{"Add":" ALLOCATOR.lock().init(heap_start.as_mut_ptr(), HEAP_SIZE);"},{"Add":" }"},{"Add":""},{"Add":" Ok(())"},{"Add":"}"}]}},{"Edit":{"inode":{"change":3,"pos":2242},"path":"kernel/Cargo.toml","line":9,"atom":{"NewVertex":{"up_context":[{"change":2,"pos":2393}],"down_context":[{"change":2,"pos":2393}],"flag":"BLOCK","start":4690,"end":4723,"inode":{"change":3,"pos":2242}}},"contents":[{"Add":"linked_list_allocator = \"0.10.5\""}]}},{"Replacement":{"inode":{"change":3,"pos":2547},"path":"Cargo.lock","line":7,"ins":{"up_context":[{"change":3,"pos":2680}],"down_context":[{"change":3,"pos":2699}],"flag":"BLOCK","start":4724,"end":4743,"inode":{"change":3,"pos":2547}},"del":{"edges":[{"previous":"BLOCK","flag":"BLOCK | DELETED","from":{"change":3,"pos":2680},"to":{"change":3,"start":2680,"end":2699},"introduced_by":3}],"inode":{"change":3,"pos":2547}},"ins_contents":[{"Add":"version = 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