1 #![no_std] 2 #![no_main] 3 #![feature(fmt_internals)] 4 5 use core::{ 6 ffi::c_void, 7 fmt::{Formatter, Write}, 8 }; 9 extern crate alloc; 10 11 use alloc::string::String; 12 use log::info; 13 use uefi::{ 14 table::{Boot, SystemTable}, 15 CStr16, Handle, 16 }; 17 18 mod arch; 19 20 extern "C" { 21 fn _start() -> !; 22 } 23 24 #[no_mangle] 25 unsafe extern "efiapi" fn efi_main( 26 handle_ptr: *mut c_void, 27 system_table_ptr: *mut c_void, 28 ) -> usize { 29 rs_efi_main(handle_ptr, system_table_ptr) 30 .map(|_| uefi::Status::SUCCESS.0 as usize) 31 .unwrap_or_else(|e| e.0 as usize) 32 } 33 34 fn rs_efi_main( 35 handle_ptr: *mut c_void, 36 system_table_ptr: *mut c_void, 37 ) -> Result<(), uefi::prelude::Status> { 38 let image_handle = 39 unsafe { Handle::from_ptr(handle_ptr).ok_or(uefi::Status::INVALID_PARAMETER)? }; 40 let mut system_table: SystemTable<uefi::table::Boot> = 41 unsafe { SystemTable::from_ptr(system_table_ptr).ok_or(uefi::Status::INVALID_PARAMETER)? }; 42 unsafe { system_table.boot_services().set_image_handle(image_handle) }; 43 44 uefi_services::init(&mut system_table).map_err(|e| e.status())?; 45 46 let mut buf = [0u16; 32]; 47 system_table.stdout().write_str("123455\n"); 48 let x = CStr16::from_str_with_buf("DragonBoot Starting...\n", &mut buf).unwrap(); 49 system_table 50 .stdout() 51 .output_string(x) 52 .map_err(|e| e.status())?; 53 54 let x = String::from("AAAAAAAHello, world!\n"); 55 system_table.stdout().write_str(x.as_str()); 56 57 let args = core::format_args!("hgfhgfhfHello, world!\n"); 58 // 这里println的FormatWriter里面的&'a dyn (Write +'a)貌似不能在重定位之前访问，不然的话会出现错误： 59 // ``` 60 // Found EFI removable media binary efi/boot/bootriscv64.efi 61 // 20336 bytes read in 4 ms (4.8 MiB/s) 62 // Booting /efi\boot\bootriscv64.efi 63 // 123455 64 // DragonBoot Starting... 65 // AAAAAAAHello, world! 66 // Unhandled exception: Illegal instruction 67 // EPC: 00000000000012b0 RA: 000000009deee240 TVAL: 0000000000000000 68 // EPC: ffffffffe0abf2b0 RA: 000000007e9ac240 reloc adjusted 69 // Code: 0000 0000 0000 0000 0000 0000 0000 0000 (0000) 70 // UEFI image [0x000000009deec000:0x000000009def0f6f] '/efi\boot\bootriscv64.efi 71 // ``` 72 // 73 // Fault的PC和值都是错误的，因此猜想动态分发这块的代码不是PIC的，需要重定位，因此不能在重定位之前用println 74 75 loop {} 76 // 执行下面这行会出错，就是上面注释说的那个错误 77 system_table.stdout().write_fmt(args); 78 // system_table.stdout().write_str(args); 79 80 loop {} 81 return Ok(()); 82 } 83 84 #[no_mangle] 85 fn _relocate() { 86 loop {} 87 } 88 89 pub fn x() {} 90