diff --git a/src/arch/x86_64/memory/mod.rs b/src/arch/x86_64/memory/mod.rs index ef208a7..c05ce04 100644 --- a/src/arch/x86_64/memory/mod.rs +++ b/src/arch/x86_64/memory/mod.rs @@ -5,9 +5,10 @@ mod area_frame_allocator; mod paging; -pub use self::area_frame_allocator::AreaFrameAllocator; +use multiboot2::BootInformation; +use arch::x86_64; -pub use self::paging::remap_kernel; +pub use self::area_frame_allocator::AreaFrameAllocator; /// The physical size of each frame. pub const PAGE_SIZE: usize = 4096; @@ -75,3 +76,38 @@ pub trait FrameAllocator { fn alloc_frame(&mut self) -> Option; fn dealloc_frame(&mut self, frame: Frame); } + + +pub fn init(boot_info: &BootInformation) { + let memory_map_tag = boot_info.memory_map_tag() + .expect("multiboot: Memory map tag required"); + let elf_sections_tag = boot_info.elf_sections_tag() + .expect("multiboot: ELF sections tag required"); + + info!("memory areas:"); + for area in memory_map_tag.memory_areas() { + info!(" start: 0x{:x}, length: 0x{:x}", + area.base_addr, area.length); + } + + let kernel_start = elf_sections_tag.sections() + .filter(|s| s.is_allocated()).map(|s| s.addr).min().unwrap(); + let kernel_end = elf_sections_tag.sections() + .filter(|s| s.is_allocated()).map(|s| s.addr + s.size).max().unwrap(); + + info!("kernel start: {:#x}, kernel end: {:#x}", + kernel_start, kernel_end); + info!("multiboot start: {:#x}, multiboot end: {:#x}", + boot_info.start_address(), boot_info.end_address()); + + let mut frame_allocator = AreaFrameAllocator::new( + kernel_start as usize, kernel_end as usize, boot_info.start_address(), + boot_info.end_address(), memory_map_tag.memory_areas()); + + // Enable required CPU features + x86_64::enable_nxe_bit(); // Enable NO_EXECUTE pages + x86_64::enable_wrprot_bit(); // Disable writing to non-WRITABLE pages + + paging::remap_kernel(&mut frame_allocator, boot_info); + info!("-- kernel remapped --"); +} diff --git a/src/arch/x86_64/memory/paging/mod.rs b/src/arch/x86_64/memory/paging/mod.rs index d8a99ae..4bce232 100644 --- a/src/arch/x86_64/memory/paging/mod.rs +++ b/src/arch/x86_64/memory/paging/mod.rs @@ -177,7 +177,7 @@ pub fn remap_kernel(allocator: &mut A, boot_info: &BootInformation) } assert!(section.start_address() % PAGE_SIZE == 0, "ELF sections must be page-aligned!"); - info!("Mapping section at addr: {:#x}, size: {:#x}", + debug!("Mapping section at addr: {:#x}, size: {:#x}", section.addr, section.size); let flags = EntryFlags::from_elf_section_flags(section); @@ -202,30 +202,5 @@ pub fn remap_kernel(allocator: &mut A, boot_info: &BootInformation) let old_table = active_table.switch(new_table); info!("Successfully switched to new page table."); -} - -/// Temporary function to test paging -pub fn test_paging(allocator: &mut A) where A: FrameAllocator { - let mut page_table = unsafe {ActivePageTable::new()}; - - // test stuff - - let addr = 42 * 515 * 515 * 4096; - let page = Page::containing_address(addr); - let frame = allocator.alloc_frame().expect("no more frames"); - println!("vaddr->phys = {:?}, map to {:?}", page_table.translate(addr), frame); - page_table.map_to(page, frame, EntryFlags::empty(), allocator); - println!("vaddr->phys = {:?} (after mapping)", page_table.translate(addr)); - println!("next frame: {:?}", allocator.alloc_frame()); - - println!("{:#x}", unsafe { - *(Page::containing_address(addr).start_address() as *const u64) - }); - - page_table.unmap(Page::containing_address(addr), allocator); - println!("vaddr->phys = {:?} (should be None)", page_table.translate(addr)); - // println!("{:#x}", unsafe { - // *(Page::containing_address(addr).start_address() as *const u64) - // }); } diff --git a/src/lib.rs b/src/lib.rs index 816b982..d501749 100644 --- a/src/lib.rs +++ b/src/lib.rs @@ -33,44 +33,8 @@ pub extern fn kernel_main(multiboot_info_pointer: usize) { logger::init().expect("Logger failed to launch!"); let boot_info = unsafe {multiboot2::load(multiboot_info_pointer)}; - let memory_map_tag = boot_info.memory_map_tag() - .expect("multiboot: Memory map tag required"); - let elf_sections_tag = boot_info.elf_sections_tag() - .expect("multiboot: ELF sections tag required"); - println!("memory areas:"); - for area in memory_map_tag.memory_areas() { - println!(" start: 0x{:x}, length: 0x{:x}", - area.base_addr, area.length); - } - /*debug!("kernel sections:"); - for section in elf_sections_tag.sections() { - debug!(" start: 0x{:x}, size: 0x{:x}, flags: 0x{:x}", - section.addr, section.size, section.flags); - }*/ - - let kernel_start = elf_sections_tag.sections().map(|s| s.addr) - .min().unwrap(); - let kernel_end = elf_sections_tag.sections().map(|s| s.addr + s.size) - .max().unwrap(); - let multiboot_start = multiboot_info_pointer; - let multiboot_end = multiboot_start + (boot_info.total_size as usize); - let mut frame_allocator = memory::AreaFrameAllocator::new( - kernel_start as usize, kernel_end as usize, multiboot_start, - multiboot_end, memory_map_tag.memory_areas()); - - println!("multiboot start: {:#x}, multiboot end: {:#x}", - multiboot_start, multiboot_end); - - // Enable required CPU features - x86_64::enable_nxe_bit(); // Enable NO_EXECUTE pages - x86_64::enable_wrprot_bit(); // Disable writing to non-WRITABLE pages - - memory::remap_kernel(&mut frame_allocator, boot_info); - - println!("-- remap_kernel finished! --"); - - info!("{:?}", frame_allocator.alloc_frame()); + memory::init(boot_info); loop {} }