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