//
// http://www.jamesmolloy.co.uk/tutorial_html/9.-Multitasking.html
//

#include "kernel.h"	// general kernel config & includes
#include "console.h"	// this will allow us to write to screen
#include "x86.h"

#include "../lib/logger/log.h"	// logger facilities
#define FOOLOS_MODULE_NAME "kernel"

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

///////
// interrupt handler prototypes
// todo: move somewhere else!?
void int_def_handler();
void int_clock_handler();
void int_kb_handler();
void int_floppy_handler();

////////// KERNEL MAIN///// /////
//

uint32_t read_eip();

// just a test handler for software interrupt 88, todo: remove and 
// implement some syscalls!
//
void int_test_handler_worker()
{
    // this can not be called directly from interrupt handler
    // due to optional parameters (...)  probably!
   panic(FOOLOS_MODULE_NAME,"unhandled EXCEPTION!");
}
void int_test_handler()
{
    X86_IRQ_BEGIN
    int_test_handler_worker();
    sleep(30);
    while(1); // hang!
    X86_IRQ_END
}

// heart of our operating system.
void kernel_main(uint32_t initial_stack)
{

    // 
    // We want to get output to the screen as fast as possible!
    //
    // Our Fool-Boot-Loader did set up VESA already for us.
    // The desired VESA mode is hardcoded in [boot/mbr.asm].
    //
    // The [vesa_init(...)] function requires:
    //
    //	* the addresses of the vbeinfo struct
    //	* the address of the vbemodeinfo struct (for selected mode).
    //	* the address of our Fool-Font binary data.
    //
    //	The first two paramters are hardcoded in [boot/mbr.asm],
    //	while the last one is set in the Makefile. The font binary
    //	is integrated in the kernel image.
    //
    //  this function returns the physical base address of 
    //  our video memory 
    //
    uint32_t vesa_physbase=vesa_init(0x8300,0x8400,0x7200);

    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"initial esp: 0x%08X",initial_stack);

    //
    // PIT config (timer)
    timer_init();
  

    // we know that here, the bootloader placed the mamory map!
    mem_init(0x7c00+0x400,*((uint16_t *)(0x7c00+0x600)));
    
    // paging  (pass the vesa physbase address for identity mapping)
    vmem_init(vesa_physbase);

    //

    // init and interrupt decriptor table 
    int_init(0x08);

    int_install();

    // setup custom interrupts
    // remember that we shifted all interrupts with the pic by 32
    // so clock = 32 (irq 0)
    // keyboard = 33 (irq 1)
    // floppy = 38 (irq 6)
    // etc..

    // install PIT interrupt handler
    int_install_ir(32, 0b10001110, 0x08,&int_clock_handler);

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

    // install floppy interrupt handler
    int_install_ir(38, 0b10001110, 0x08,&int_floppy_handler);

    // install test software interrupt handler
    int_install_ir(88, 0b10001110, 0x08,&int_test_handler);
    
    for(int i=0;i<19;i++)
	int_install_ir(i, 0b10001110, 0x08,&int_test_handler);

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

//    int x=10/0;

    // pci
    pci_init();

    // floppy
    floppy_init();

    //init shell
    shell_init();
    /*

   log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"test mem");

   // test a20 disabled / wrap
   uint8_t *memtest=0x0;
   uint8_t *memtest2=0b10000000000000000000;

   *memtest=0xaf;
   log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"test mem %x",*(memtest2-1));
   log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"test mem %x",*memtest2);
   log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"test mem %x",*(memtest2+1));
   */

    /* stack pointer test?
   uint32_t *esp=0x90000;
   for(int i=0;i<10;i++)
   {
    log(FOOLOS_MODULE_NAME,FOOLOS_LOG_INFO,"esp: %x",*esp);
    esp--;
   }
   */
    while(1)
    {
	
    }

 
}