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 extern crate elf;
11
12 use alloc::string::String;
13 use log::info;
14 use uefi::{
15 table::{Boot, SystemTable},
16 CStr16, Handle,
17 };
18
19 mod arch;
20
21 extern "C" {
_start() -> !22 fn _start() -> !;
23 }
24
25 #[no_mangle]
efi_main( handle_ptr: *mut c_void, system_table_ptr: *mut c_void, ) -> usize26 unsafe extern "efiapi" fn efi_main(
27 handle_ptr: *mut c_void,
28 system_table_ptr: *mut c_void,
29 ) -> usize {
30 rs_efi_main(handle_ptr, system_table_ptr)
31 .map(|_| uefi::Status::SUCCESS.0 as usize)
32 .unwrap_or_else(|e| e.0 as usize)
33 }
34
rs_efi_main( handle_ptr: *mut c_void, system_table_ptr: *mut c_void, ) -> Result<(), uefi::prelude::Status>35 fn rs_efi_main(
36 handle_ptr: *mut c_void,
37 system_table_ptr: *mut c_void,
38 ) -> Result<(), uefi::prelude::Status> {
39 let image_handle =
40 unsafe { Handle::from_ptr(handle_ptr).ok_or(uefi::Status::INVALID_PARAMETER)? };
41 let mut system_table: SystemTable<uefi::table::Boot> =
42 unsafe { SystemTable::from_ptr(system_table_ptr).ok_or(uefi::Status::INVALID_PARAMETER)? };
43 unsafe { system_table.boot_services().set_image_handle(image_handle) };
44
45 uefi_services::init(&mut system_table).map_err(|e| e.status())?;
46
47 let mut buf = [0u16; 32];
48 system_table.stdout().write_str("123455\n");
49 let x = CStr16::from_str_with_buf("DragonBoot Starting...\n", &mut buf).unwrap();
50 system_table
51 .stdout()
52 .output_string(x)
53 .map_err(|e| e.status())?;
54
55 let x = String::from("AAAAAAAHello, world!\n");
56 system_table.stdout().write_str(x.as_str());
57
58 let args = core::format_args!("hgfhgfhfHello, world!\n");
59 // 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：
60 // ```
61 // Found EFI removable media binary efi/boot/bootriscv64.efi
62 // 20336 bytes read in 4 ms (4.8 MiB/s)
63 // Booting /efi\boot\bootriscv64.efi
64 // 123455
65 // DragonBoot Starting...
66 // AAAAAAAHello, world!
67 // Unhandled exception: Illegal instruction
68 // EPC: 00000000000012b0 RA: 000000009deee240 TVAL: 0000000000000000
69 // EPC: ffffffffe0abf2b0 RA: 000000007e9ac240 reloc adjusted
70 // Code: 0000 0000 0000 0000 0000 0000 0000 0000 (0000)
71 // UEFI image [0x000000009deec000:0x000000009def0f6f] '/efi\boot\bootriscv64.efi
72 // ```
73 //
74 // 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
75
76 loop {}
77 // 执行下面这行会出错，就是上面注释说的那个错误
78 system_table.stdout().write_fmt(args);
79 // system_table.stdout().write_str(args);
80
81 loop {}
82 return Ok(());
83 }
84
85 #[no_mangle]
_relocate()86 fn _relocate() {
87 loop {}
88 }
89
x()90 pub fn x() {}
91