103 lines
2.8 KiB
Rust
103 lines
2.8 KiB
Rust
use super::__switch;
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use super::{fetch_task, TaskStatus};
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use super::{ProcessControlBlock, TaskContext, TaskControlBlock};
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use crate::sync::UPIntrFreeCell;
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use crate::trap::TrapContext;
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use alloc::sync::Arc;
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use lazy_static::*;
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pub struct Processor {
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current: Option<Arc<TaskControlBlock>>,
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idle_task_cx: TaskContext,
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}
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impl Processor {
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pub fn new() -> Self {
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Self {
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current: None,
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idle_task_cx: TaskContext::zero_init(),
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}
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}
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fn get_idle_task_cx_ptr(&mut self) -> *mut TaskContext {
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&mut self.idle_task_cx as *mut _
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}
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pub fn take_current(&mut self) -> Option<Arc<TaskControlBlock>> {
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self.current.take()
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}
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pub fn current(&self) -> Option<Arc<TaskControlBlock>> {
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self.current.as_ref().map(Arc::clone)
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}
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}
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lazy_static! {
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pub static ref PROCESSOR: UPIntrFreeCell<Processor> =
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unsafe { UPIntrFreeCell::new(Processor::new()) };
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}
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pub fn run_tasks() {
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loop {
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let mut processor = PROCESSOR.exclusive_access();
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if let Some(task) = fetch_task() {
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let idle_task_cx_ptr = processor.get_idle_task_cx_ptr();
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// access coming task TCB exclusively
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let next_task_cx_ptr = task.inner.exclusive_session(|task_inner| {
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task_inner.task_status = TaskStatus::Running;
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&task_inner.task_cx as *const TaskContext
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});
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processor.current = Some(task);
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// release processor manually
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drop(processor);
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unsafe {
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__switch(idle_task_cx_ptr, next_task_cx_ptr);
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}
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} else {
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println!("no tasks available in run_tasks");
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}
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}
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}
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pub fn take_current_task() -> Option<Arc<TaskControlBlock>> {
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PROCESSOR.exclusive_access().take_current()
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}
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pub fn current_task() -> Option<Arc<TaskControlBlock>> {
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PROCESSOR.exclusive_access().current()
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}
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pub fn current_process() -> Arc<ProcessControlBlock> {
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current_task().unwrap().process.upgrade().unwrap()
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}
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pub fn current_user_token() -> usize {
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let task = current_task().unwrap();
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task.get_user_token()
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}
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pub fn current_trap_cx() -> &'static mut TrapContext {
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current_task()
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.unwrap()
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.inner_exclusive_access()
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.get_trap_cx()
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}
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pub fn current_trap_cx_user_va() -> usize {
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current_task()
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.unwrap()
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.inner_exclusive_access()
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.res
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.as_ref()
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.unwrap()
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.trap_cx_user_va()
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}
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pub fn current_kstack_top() -> usize {
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current_task().unwrap().kstack.get_top()
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}
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pub fn schedule(switched_task_cx_ptr: *mut TaskContext) {
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let idle_task_cx_ptr =
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PROCESSOR.exclusive_session(|processor| processor.get_idle_task_cx_ptr());
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unsafe {
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__switch(switched_task_cx_ptr, idle_task_cx_ptr);
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}
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}
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