1 //! tty刷新内核线程 2 3 use alloc::{string::ToString, sync::Arc}; 4 use kdepends::thingbuf::StaticThingBuf; 5 6 use crate::{ 7 arch::CurrentIrqArch, 8 driver::tty::virtual_terminal::vc_manager, 9 exception::InterruptArch, 10 process::{ 11 kthread::{KernelThreadClosure, KernelThreadMechanism}, 12 ProcessControlBlock, ProcessManager, 13 }, 14 sched::{schedule, SchedMode}, 15 }; 16 17 /// 用于缓存键盘输入的缓冲区 18 static KEYBUF: StaticThingBuf<u8, 512> = StaticThingBuf::new(); 19 20 static mut TTY_REFRESH_THREAD: Option<Arc<ProcessControlBlock>> = None; 21 22 pub(super) fn tty_flush_thread_init() { 23 let closure = 24 KernelThreadClosure::StaticEmptyClosure((&(tty_refresh_thread as fn() -> i32), ())); 25 let pcb = KernelThreadMechanism::create_and_run(closure, "tty_refresh".to_string()) 26 .ok_or("") 27 .expect("create tty_refresh thread failed"); 28 unsafe { 29 TTY_REFRESH_THREAD = Some(pcb); 30 } 31 } 32 33 fn tty_refresh_thread() -> i32 { 34 const TO_DEQUEUE_MAX: usize = 256; 35 loop { 36 if KEYBUF.is_empty() { 37 // 如果缓冲区为空，就休眠 38 let _guard = unsafe { CurrentIrqArch::save_and_disable_irq() }; 39 ProcessManager::mark_sleep(true).expect("TTY_REFRESH_THREAD can not mark sleep"); 40 schedule(SchedMode::SM_NONE); 41 } 42 43 let to_dequeue = core::cmp::min(KEYBUF.len(), TO_DEQUEUE_MAX); 44 if to_dequeue == 0 { 45 continue; 46 } 47 let mut data = [0u8; TO_DEQUEUE_MAX]; 48 for item in data.iter_mut().take(to_dequeue) { 49 *item = KEYBUF.pop().unwrap(); 50 } 51 52 if let Some(cur_vc) = vc_manager().current_vc() { 53 let _ = cur_vc 54 .port() 55 .receive_buf(&data[0..to_dequeue], &[], to_dequeue); 56 } else { 57 // 这里由于stdio未初始化，所以无法找到port 58 // TODO: 考虑改用双端队列，能够将丢失的输入插回 59 } 60 } 61 } 62 63 /// 发送数据到tty刷新线程 64 pub fn send_to_tty_refresh_thread(data: &[u8]) { 65 if unsafe { TTY_REFRESH_THREAD.is_none() } { 66 return; 67 } 68 69 for item in data { 70 KEYBUF.push(*item).ok(); 71 } 72 let _ = ProcessManager::wakeup(unsafe { TTY_REFRESH_THREAD.as_ref().unwrap() }); 73 } 74