1 use crate::include::bindings::bindings::{process_control_block, switch_proc};
2 
3 use core::sync::atomic::compiler_fence;
4 
5 use super::fpu::{fp_state_restore, fp_state_save};
6 
7 /// @brief 切换进程的上下文（没有切换页表的动作）
8 ///
9 /// @param next 下一个进程的pcb
10 /// @param trap_frame 中断上下文的栈帧
11 #[inline(always)]
switch_process( prev: &'static mut process_control_block, next: &'static mut process_control_block, )12 pub fn switch_process(
13     prev: &'static mut process_control_block,
14     next: &'static mut process_control_block,
15 ) {
16     fp_state_save(prev);
17     fp_state_restore(next);
18     compiler_fence(core::sync::atomic::Ordering::SeqCst);
19     let new_address_space = next.address_space().unwrap_or_else(|| {
20         panic!(
21             "switch_process: next process:{} address space is null",
22             next.pid
23         )
24     });
25     unsafe {
26         // 加载页表
27         new_address_space.read().user_mapper.utable.make_current();
28         switch_proc(prev, next);
29     }
30     compiler_fence(core::sync::atomic::Ordering::SeqCst);
31 }
32