59 lines
1.7 KiB
Rust
59 lines
1.7 KiB
Rust
use crate::lazy_static;
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use x86_64::{
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instructions::tables::load_tss,
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registers::segmentation::{Segment, SegmentSelector, CS},
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structures::{
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gdt::{Descriptor, GlobalDescriptorTable},
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tss::TaskStateSegment,
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},
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VirtAddr,
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};
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lazy_static! {
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static ref TSS: TaskStateSegment = {
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let mut tss = TaskStateSegment::new();
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tss.interrupt_stack_table[crate::interrupts::DOUBLE_FAULT_STACK_IDX as usize] = {
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const STACK_SIZE: usize = 4096 * 5;
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static mut STACK: [u8; STACK_SIZE] = [0; STACK_SIZE];
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let stack_start = VirtAddr::from_ptr(unsafe { &STACK });
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let stack_end = stack_start + STACK_SIZE;
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stack_end
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};
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tss.interrupt_stack_table[crate::interrupts::TIMER_STACK_IDX as usize] = {
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const STACK_SIZE: usize = 4096 * 5;
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static mut STACK: [u8; STACK_SIZE] = [0; STACK_SIZE];
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let stack_start = VirtAddr::from_ptr(unsafe { &STACK });
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let stack_end = stack_start + STACK_SIZE;
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stack_end
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};
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tss
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};
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static ref GDT: (GlobalDescriptorTable, Selectors) = {
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let mut gdt = GlobalDescriptorTable::new();
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let code_selector = gdt.add_entry(Descriptor::kernel_code_segment());
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let tss_selector = gdt.add_entry(Descriptor::tss_segment(&TSS));
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(
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gdt,
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Selectors {
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code_selector,
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tss_selector,
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},
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)
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};
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}
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struct Selectors {
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code_selector: SegmentSelector,
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tss_selector: SegmentSelector,
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}
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pub fn init_gdt() {
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GDT.0.load();
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unsafe {
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CS::set_reg(GDT.1.code_selector);
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load_tss(GDT.1.tss_selector);
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}
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}
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