Delete redundant entry code

src/entry.rs

@@ -1,113 +0,0 @@
-// src/entry.rs
-#![no_std]
-#![no_main]
-
-use crate::uart;
-
-mod heap;
-mod uart;
-
-static INIT_LOCK: spin::Once<()> = spin::Once::new();
-
-core::arch::global_asm!(include_str!("entry.s"));
-
-/// After some initialization in asm/entry.S, the kernel will jump here and
-/// each hart will have its own setup sequence.
-#[no_mangle]
-unsafe extern "C" fn _start() {
-    use core::arch::asm;
-    use riscv::register::{mepc, mstatus, satp, sie, sstatus};
-
-    // Set previous privilege for all harts to M-mode, set previous interrupt
-    // enable, and set floating-point unit to initial state
-    mstatus::set_mpp(mstatus::MPP::Supervisor);
-    mstatus::set_mpie();
-    mstatus::set_fs(sstatus::FS::Initial);
-
-    // Store ref to main in M-mode exception program counter
-    mepc::write(main as usize);
-
-    // Disable paging
-    satp::write(0);
-
-    // Delegate all traps to S-mode, using inline assembly since we have not
-    // provided a wrapper for it yet
-    asm!("li t0, 0xffff", "csrw medeleg, t0", "csrw mideleg, t0",);
-
-    // Enable S-mode external, timer, and software interrupts
-    sie::set_sext();
-    sie::set_stimer();
-    sie::set_ssoft();
-
-    // TODO configure PMP
-    // TODO timer init
-
-    // Use mret to jump to main
-    asm!("mret");
-}
-
-extern "C" fn main() {
-    use riscv::interrupt;
-    use riscv::register::{mstatus, sstatus};
-
-    if hartid() == 0 {
-        INIT_LOCK.call_once(|| {
-            // Disable machine interrupts while initializing
-            interrupt::machine::disable();
-            console_init();
-            // TODO Write boot message
-
-            // TODO Set up paging
-            // TODO Set up processes
-
-            // TODO Set up trap vectors
-            // TODO Set up PLIC
-
-            kinit();
-            unsafe {
-                mstatus::set_mpp(mstatus::MPP::User);
-                mstatus::set_mpie();
-                mstatus::set_spie();
-                mstatus::set_fs(sstatus::FS::Initial);
-            }
-
-            riscv::asm::fence(); // Emit a fence just in case
-        });
-
-        // poll console for input and print characters back
-        loop {
-            let c = crate::uart::CONSOLE.lock().as_mut().and_then(crate::uart::Device::get);
-            if let Some(c) = c { crate::print!("{}", c as char); }
-        }
-    } else {
-        INIT_LOCK.wait();
-        riscv::asm::fence(); // Emit a fence just in case
-        kinit_hart();
-    }
-}
-
-fn console_init() {
-    // Initialize heap
-    unsafe { crate::heap::init(); };
-
-    // Set up UART and print to console
-    crate::uart::init_console(0x1000_0000);
-    crate::println!("Hello from hart {}!", hartid());
-}
-
-fn kinit() {}
-
-fn kinit_hart() {}
-
-#[inline]
-fn hartid() -> usize {
-    use core::arch::asm;
-    let id: usize;
-    unsafe {
-        asm!(
-            "mv {id}, tp",
-            id = out(reg) id,
-        );
-    }
-    id
-}