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Create and load a static TSS and GDT

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Philipp Oppermann
2017-04-19 12:12:16 +02:00
parent 58e90d497e
commit 165054d12a
1 changed files with 19 additions and 3 deletions
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16
src/interrupts/mod.rs
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@@ -2,6 +2,7 @@ use x86_64::VirtualAddress;
use x86_64::structures::idt::{Idt, ExceptionStackFrame}; use x86_64::structures::idt::{Idt, ExceptionStackFrame};
use x86_64::structures::tss::TaskStateSegment; use x86_64::structures::tss::TaskStateSegment;
use memory::MemoryController; use memory::MemoryController;
use spin::Once;
mod gdt; mod gdt;
@@ -14,15 +15,30 @@ lazy_static! {
}; };
} }
static TSS: Once<TaskStateSegment> = Once::new();
static GDT: Once<gdt::Gdt> = Once::new();
const DOUBLE_FAULT_IST_INDEX: usize = 0; const DOUBLE_FAULT_IST_INDEX: usize = 0;
pub fn init(memory_controller: &mut MemoryController) { pub fn init(memory_controller: &mut MemoryController) {
let double_fault_stack = memory_controller.alloc_stack(1) let double_fault_stack = memory_controller.alloc_stack(1)
.expect("could not allocate double fault stack"); .expect("could not allocate double fault stack");
let tss = TSS.call_once(|| {
let mut tss = TaskStateSegment::new(); let mut tss = TaskStateSegment::new();
tss.interrupt_stack_table[DOUBLE_FAULT_IST_INDEX] = VirtualAddress( tss.interrupt_stack_table[DOUBLE_FAULT_IST_INDEX] = VirtualAddress(
double_fault_stack.top()); double_fault_stack.top());
tss
});
let gdt = GDT.call_once(|| {
let mut gdt = gdt::Gdt::new();
let code_selector = gdt.add_entry(gdt::Descriptor::
kernel_code_segment());
let tss_selector = gdt.add_entry(gdt::Descriptor::tss_segment(&tss));
gdt
});
gdt.load();
IDT.load(); IDT.load();
} }