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66 lines
2.0 KiB
66 lines
2.0 KiB
//! The main module and entrypoint
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//!
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//! The operating system and app also starts in this module. Kernel code starts
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//! executing from `entry.asm`, after which [`rust_main()`] is called to
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//! initialize various pieces of functionality [`clear_bss()`]. (See its source code for
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//! details.)
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//!
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//! We then call [`println!`] to display `Hello, world!`.
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#![deny(missing_docs)]
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#![deny(warnings)]
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#![no_std]
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#![no_main]
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#![feature(panic_info_message)]
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use core::arch::global_asm;
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#[macro_use]
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mod console;
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mod lang_items;
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mod qemu_exit;
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mod sbi;
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use crate::qemu_exit::{QEMUExit, QEMU_EXIT_HANDLE};
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global_asm!(include_str!("entry.asm"));
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/// clear BSS segment
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pub fn clear_bss() {
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extern "C" {
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fn sbss();
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fn ebss();
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}
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(sbss as usize..ebss as usize).for_each(|a| unsafe { (a as *mut u8).write_volatile(0) });
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}
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/// the rust entry-point of os
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#[no_mangle]
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pub fn rust_main() -> ! {
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extern "C" {
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fn stext(); // begin addr of text segment
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fn etext(); // end addr of text segment
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fn srodata(); // start addr of Read-Only data segment
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fn erodata(); // end addr of Read-Only data ssegment
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fn sdata(); // start addr of data segment
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fn edata(); // end addr of data segment
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fn sbss(); // start addr of BSS segment
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fn ebss(); // end addr of BSS segment
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fn boot_stack(); // stack bottom
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fn boot_stack_top(); // stack top
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}
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clear_bss();
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println!("Hello, world!");
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println!(".text [{:#x}, {:#x})", stext as usize, etext as usize);
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println!(".rodata [{:#x}, {:#x})", srodata as usize, erodata as usize);
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println!(".data [{:#x}, {:#x})", sdata as usize, edata as usize);
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println!(
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"boot_stack [{:#x}, {:#x})",
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boot_stack as usize, boot_stack_top as usize
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);
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println!(".bss [{:#x}, {:#x})", sbss as usize, ebss as usize);
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QEMU_EXIT_HANDLE.exit_success(); //need successful qemu exit
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//QEMU_EXIT_HANDLE.exit_failure(); //need failed qemu exit
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//panic!("Shutdown machine!");
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}
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