1 use core::intrinsics::unreachable; 2 3 use fdt::node::FdtNode; 4 5 use crate::{ 6 arch::mm::init::mm_early_init, 7 driver::{firmware::efi::init::efi_init, open_firmware::fdt::open_firmware_fdt_driver}, 8 init::{boot_params, init_before_mem_init}, 9 kdebug, kinfo, 10 mm::{PhysAddr, VirtAddr}, 11 print, println, 12 }; 13 14 #[derive(Debug)] 15 pub struct ArchBootParams { 16 /// 启动时的fdt物理地址 17 pub fdt_paddr: PhysAddr, 18 pub fdt_vaddr: Option<VirtAddr>, 19 } 20 21 impl ArchBootParams { 22 pub const DEFAULT: Self = ArchBootParams { 23 fdt_paddr: PhysAddr::new(0), 24 fdt_vaddr: None, 25 }; 26 27 pub fn arch_fdt(&self) -> VirtAddr { 28 // 如果fdt_vaddr为None，则说明还没有进行内核虚拟地址空间的映射，此时返回物理地址 29 if self.fdt_vaddr.is_none() { 30 return VirtAddr::new(self.fdt_paddr.data()); 31 } 32 self.fdt_vaddr.unwrap() 33 } 34 } 35 36 #[no_mangle] 37 unsafe extern "C" fn kernel_main(hartid: usize, fdt_paddr: usize) -> ! { 38 let fdt_paddr = PhysAddr::new(fdt_paddr); 39 // system_reset(sbi::reset::ResetType::Shutdown, sbi::reset::ResetReason::NoReason); 40 init_before_mem_init(); 41 42 boot_params().write().arch.fdt_paddr = fdt_paddr; 43 kinfo!( 44 "DragonOS kernel is running on hart {}, fdt address:{:?}", 45 hartid, 46 fdt_paddr 47 ); 48 49 mm_early_init(); 50 51 let fdt = fdt::Fdt::from_ptr(fdt_paddr.data() as *const u8).expect("Failed to parse fdt!"); 52 // print_node(fdt.find_node("/").unwrap(), 0); 53 54 parse_dtb(); 55 56 efi_init(); 57 58 loop {} 59 unreachable() 60 } 61 62 #[inline(never)] 63 fn print_node(node: FdtNode<'_, '_>, n_spaces: usize) { 64 (0..n_spaces).for_each(|_| print!(" ")); 65 println!("{}/", node.name); 66 node.properties().for_each(|p| { 67 (0..n_spaces + 4).for_each(|_| print!(" ")); 68 println!("{}: {:?}", p.name, p.value); 69 }); 70 71 for child in node.children() { 72 print_node(child, n_spaces + 4); 73 } 74 } 75 76 /// 解析fdt，获取内核启动参数 77 #[inline(never)] 78 unsafe fn parse_dtb() { 79 let fdt_paddr = boot_params().read().arch.fdt_paddr; 80 if fdt_paddr.is_null() { 81 panic!("Failed to get fdt address!"); 82 } 83 84 open_firmware_fdt_driver() 85 .early_scan_device_tree() 86 .expect("Failed to scan device tree at boottime."); 87 } 88