Function page_fault_handler

kernel/src/interrupts.rs:249–274

(
    stack_frame: InterruptStackFrame,
    error_code: PageFaultErrorCode,
)

use crate::hlt_loop;

extern "x86-interrupt" fn page_fault_handler(
    stack_frame: InterruptStackFrame,
    error_code: PageFaultErrorCode,
) {
    use x86_64::registers::control::Cr2;
    let accessed_virtaddr = Cr2::read();

    if error_code == (PageFaultErrorCode::PROTECTION_VIOLATION |
                      PageFaultErrorCode::CAUSED_BY_WRITE |
                      PageFaultErrorCode::USER_MODE) {
        // User code tried to access a read-only page
        // Missing stack or heap frame

        if let Err(msg) = memory::allocate_missing_ondemand_frame(accessed_virtaddr) {
            println!("Page fault error: {}", msg);
            hlt_loop();
        }
    } else {
        println!("EXCEPTION: PAGE FAULT");
        println!("Accessed Address: {:?}", accessed_virtaddr);
        println!("Error Code: {:?}", error_code);
        println!("{:#?}", stack_frame);

        hlt_loop();
    }
}

extern "x86-interrupt" fn general_protection_fault_handler(
    stack_frame: InterruptStackFrame,