//kernel.c
//08/13/03 Josh Holtrop
//Holtrop's Operating System

#define VXR video_mode.XResolution
#define VYR video_mode.YResolution

#include "k_defines.h"

#include "lib/string.h"
#include "lib/io.h"

#include "functions.h"
#include "video.h"
#include "mm.h"
#include "keyboard.h"

void isr(dword num);
void k_init();

#include "keyboard.c"
#include "mm.c"
#include "functions.c"
#include "video.c"

dword	timer = 0;
dword	index = 0;
dword	keepgoing = 1;
dword	addresses[256];

void k_init()
{
	remap_pics(0x20, 0x28);
	//set timer : 2e9c = 100hz
	outportb(0x43, 0x34);
	outportb(0x40, 0x9c); //lsb
	outportb(0x40, 0x2e); //msb
	video_init((ModeInfoBlock *) 0x90306);
	video_rectf(VXR*3/11, 0, VXR*4/11, VYR-1, 0x00000088);      		//test rectangles, draws "HOS"
	video_rectf(VXR*7/11, 0, VXR*8/11, VYR-1, 0x00000088);
	video_rectf(VXR/11, 0, VXR*2/11, VYR*2/5, 0x00000088);
	video_rectf(VXR/11, VYR*3/5, VXR*2/11, VYR-1, 0x00000088);
	video_rectf(VXR*5/11, VYR/5, VXR*6/11, VYR*4/5, 0x00000088);
	video_rectf(VXR*9/11, VYR/5, VXR-1, VYR*2/5, 0x00000088);
	video_rectf(VXR*8/11, VYR*3/5, VXR*10/11, VYR*4/5, 0x00000088);

	video_vert(10, 10, 16, 0x00ffff00);		//should be yellow 'H'
	video_horiz(13, 10, 14, 0x00ffff00);
	video_vert(14, 10, 16, 0x00ffff00);

	mm_init();
	enable_ints();
	console_cls();
	printf("Memory available to OS: %d MB (Bytes: %d)\n", mm_totalmem/0x100000, mm_totalmem);
	dword key = 0;
	for (;;)
	{
		key = kbdWaitKey();
		putc(key);
	}
}

void isr(dword num)
{
	switch(num)
	{
	case 0x20:         		// IRQ0 - timer interrupt
		timer++;
		(*(byte *)0xb8000)++;
		if ((timer%25)==0)
		{
			if (keepgoing)
			{
				addresses[index] = (dword) mm_palloc(256, KERNEL_PID);
				printf("Addr: 0x%x\tEntries:\t%d\n", addresses[index], mm_freeentries());
				if (addresses[index] == 0)
				{
					index = -1;
					keepgoing = 0;
				}
				index++;
			}
			else
			{
				printf("Freeing %x\t", addresses[index]);
				addresses[index] = mm_pfree((void *)addresses[index]);
				printf("Free:\t%d\tEntries:\t%d\n", addresses[index], mm_freeentries());
				if (addresses[index] != 0)
				{
					index = -1;
					keepgoing = 1;
				}
				index++;
			}
		}
		eoi();
		break;
	case 0x21:  			// IRQ1 - keyboard interrupt
		isr_keyboard();    	//isr_keybard() takes care of calling eoi()
		break;
	}
}