#include "kernel.h"	// general kernel config & includes
#include "console.h"	// this will allow us to write to screen

// TODO: cleanup . how can i compile it without the includes!??


/// PIT /// Timer stuff

/*
 http://www.brokenthorn.com/Resources/OSDevPit.html

 vcc/gnd - voltage/ground

 D0-D7 - data lines		(data bus)
 wr/rd - writing / reading	(system control bus) 
 cs - ignore wr/rd or not	(address bus)
 a0-a1				(address bus)

 // the three 16bit down counters/timers/channels
 clk	0-2 (in)
 gate	0-2 (in)
 out	0-2 (out)




 //typical
    out1 -> pic  interrupt on every tick (system timer)
    out2 - was used for genearting dram memory refresh  (Do not use)
    out3 -> pc speaker

    gate pins : depend on mode of operation
    we do have modes 0-5.


 */







///////

void int_kb_handler();
////////// KERNEL MAIN///// /////
//

// test handler
void int_test_handler()
{
    __asm__("pusha");

    scr_put_string_nl("inside software interrupt handler 88");


    __asm__("popa");
    __asm__("leave");
    __asm__("iret");

}

// clock handler
void int_clock_handler()
{
    __asm__("pusha");

    scr_put_string_nl(".");


    // todo also the other pic!// TODO
    __asm__("mov $0x20, %al");
    __asm__("out %al, $0x20");
    //

    __asm__("popa");
    __asm__("leave");
    __asm__("iret");
    __asm__("popa");
    __asm__("leave");
    __asm__("iret");

}
void kernel_main()
{
    
    // clear console
    scr_clear();

    // hello message
    scr_put_string_nl(KERNEL_HELLO_MESSAGE);
    
    // init interrupt decriptor table 
    // install and enable!
    int_init(0x08);
    int_install();

    // remember that we shifted all interrupts with the pic by 32
    // so clock = 32 (irq 0)
    // keyboard = 22 (irq 1)
    // etc..
    
    // install pit handler (programmable timer interrupt channel0)
    int_install_ir(32, 0b10001110, 0x08,&int_clock_handler);

    // install keyboard handler
    int_install_ir(33, 0b10001110, 0x08,&int_kb_handler);

    // install test handler
    int_install_ir(88, 0b10001110, 0x08,&int_test_handler);

    // now we can enable interrupts back again
    int_enable();

    scr_put_string_nl("Interrupts are up and running");

    // kernel main loop
    while(1)
    {
	
    }
 
}