Function Initialize

Kernel/src/arch/x86_64/timer.cpp:146–162

Initialize

    // Initialize
    void Initialize(uint32_t freq) {
        IDT::RegisterInterruptHandler(IRQ0, Handler);

        frequency = freq;
        uint32_t divisor = 1193182 / freq;

        // Send the command byte.
        outportb(0x43, 0x36);

        // Divisor has to be sent byte-wise, so split here into upper/lower bytes.
        uint8_t l = (uint8_t)(divisor & 0xFF);
        uint8_t h = (uint8_t)( (divisor>>8) & 0xFF );

        // Send the frequency divisor.
        outportb(0x40, l);
        outportb(0x40, h);
    }
}