yggdrasil/arch/x86_64/src/lib.rs

#![no_std]
#![feature(effects, strict_provenance)]

use kernel_arch_interface::Architecture;

pub mod mem;
pub mod registers;

pub use mem::KernelTableManagerImpl;

pub struct ArchitectureImpl;

pub const KERNEL_VIRT_OFFSET: usize = 0xFFFFFF8000000000;

impl Architecture for ArchitectureImpl {
    fn interrupt_mask() -> bool {
        let mut flags: u64;
        unsafe {
            core::arch::asm!("pushfq; pop {0}", out(reg) flags, options(att_syntax));
        }
        // If IF is zero, interrupts are disabled (masked)
        flags & (1 << 9) == 0
    }

    unsafe fn set_interrupt_mask(mask: bool) -> bool {
        let old = Self::interrupt_mask();
        if mask {
            core::arch::asm!("cli");
        } else {
            core::arch::asm!("sti");
        }
        old
    }

    #[inline]
    fn wait_for_interrupt() {
        unsafe {
            core::arch::asm!("hlt");
        }
    }
}