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https://github.com/DragonOS-Community/DragonOS.git
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e28411791f
- 支持中断共享 - 把现有驱动程序移植到新的irq模块 - 使用`ProcessorId`标识处理器id - 尚未实现threaded_irq 性能上，edge irq flow handler里面，对于锁的使用，可能有点问题。为了获取/修改common data还有其他几个结构体的状态，进行了多次加锁和放锁，导致性能降低。这是接下来需要优化的点。
77 lines
2.4 KiB
Rust
77 lines
2.4 KiB
Rust
use x86::{current::task::TaskStateSegment, segmentation::SegmentSelector, Ring};
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use crate::{
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mm::{percpu::PerCpu, VirtAddr},
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smp::core::smp_get_processor_id,
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};
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// === 段选择子在GDT中的索引 ===
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/// kernel code segment selector
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pub const KERNEL_CS: SegmentSelector = SegmentSelector::new(1, Ring::Ring0);
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/// kernel data segment selector
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pub const KERNEL_DS: SegmentSelector = SegmentSelector::new(2, Ring::Ring0);
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/// user data segment selector
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pub const USER_DS: SegmentSelector = SegmentSelector::new(5, Ring::Ring3);
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/// user code segment selector
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/// 如果改这里，记得改syscall_64里面写死的常量
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pub const USER_CS: SegmentSelector = SegmentSelector::new(6, Ring::Ring3);
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static mut TSS_MANAGER: TSSManager = TSSManager::new();
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extern "C" {
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static mut GDT_Table: [u64; 512];
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}
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/// 切换fs和gs段寄存器
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///
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/// 由于需要return使得它生效，所以不能inline
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#[inline(never)]
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pub unsafe fn switch_fs_and_gs(fs: SegmentSelector, gs: SegmentSelector) {
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x86::segmentation::load_fs(fs);
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x86::segmentation::load_gs(gs);
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}
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#[derive(Debug)]
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pub struct TSSManager {
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tss: [TaskStateSegment; PerCpu::MAX_CPU_NUM as usize],
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}
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impl TSSManager {
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const fn new() -> Self {
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return Self {
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tss: [TaskStateSegment::new(); PerCpu::MAX_CPU_NUM as usize],
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};
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}
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/// 获取当前CPU的TSS
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pub unsafe fn current_tss() -> &'static mut TaskStateSegment {
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&mut TSS_MANAGER.tss[smp_get_processor_id().data() as usize]
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}
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/// 加载当前CPU的TSS
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pub unsafe fn load_tr() {
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let index = (10 + smp_get_processor_id().data() * 2) as u16;
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let selector = SegmentSelector::new(index, Ring::Ring0);
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Self::set_tss_descriptor(
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index,
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VirtAddr::new(Self::current_tss() as *mut TaskStateSegment as usize),
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);
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x86::task::load_tr(selector);
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}
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unsafe fn set_tss_descriptor(index: u16, vaddr: VirtAddr) {
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const LIMIT: u64 = 103;
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let gdt_vaddr = VirtAddr::new(&GDT_Table as *const _ as usize);
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let gdt: &mut [u64] = core::slice::from_raw_parts_mut(gdt_vaddr.data() as *mut u64, 512);
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let vaddr = vaddr.data() as u64;
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gdt[index as usize] = (LIMIT & 0xffff)
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| ((vaddr & 0xffff) << 16)
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| (((vaddr >> 16) & 0xff) << 32)
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| (0x89 << 40)
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| (((vaddr >> 24) & 0xff) << 56);
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gdt[index as usize + 1] = ((vaddr >> 32) & 0xffffffff) | 0;
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}
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}
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