//kernel.c
//08/13/03 Josh Holtrop
//Holtrop's Operating System
//Version: 0.12
//Modified: 12/30/03

#include "k_defines.h"		//#DEFINE's for kernel


#include "functions.h"		//general functions
#include "video.h"		//video functions
#include "mm.h"			//physical memory management functions
#include "vmm.h"		//virtual memory management & paging functions
#include "keyboard.h"		//generic keyboard driver & functions
#include "mouse.h"		//generic ps/2 mouse driver & functions
#include "fdc.h"		//Floppy Disk Controller functions
#include "stdfont.h"		//Standard font bitmask array
#include "kio.h"
#include "vfs.h"
#include "rd.h"
#include "fat12.h"

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

/* These functions are defined in asmfuncs.asm */
extern dword write_cr0(dword cr0);
extern dword read_cr0();
extern dword write_cr3(dword cr3);
extern dword read_cr3();
extern void writeCursorPosition(dword pos);
extern dword getCursorPosition();
extern void console_scroll();
extern void console_cls();
extern int puts(char *str);
extern int putDec(int number);
extern int putDecu(dword number);
extern void strcpy(char *dest, char *src);
extern void memcpy(void *dest, void *src, dword n);
extern dword strlen(char *str);

#include "fat12.c"
#include "rd.c"
#include "vfs.c"
#include "kio.c"
#include "fdc.c"
#include "mouse.c"
#include "keyboard.c"
#include "mm.c"
#include "vmm.c"
#include "functions.c"
#include "video.c"

dword	timer = 0;

//Main kernel initialization method
void k_init()
{
		// ===== Initialization
	fdc_sendDOR(0x0C);		//turn off floppy motor!!
	console_cls();
	video_init();
	mm_init();
	vmm_init();
	remap_pics(0x20, 0x28);
	init_timer();
	mouse_init();
	pic1_mask(0);			//unmask IRQ's 0-7
	pic2_mask(0);			//unmask IRQ's 8-15
	vfs_init();
	enable_ints();
	kbd_resetLEDs();		//after enabling interrupts!!
	if (videoMode)
	{
		int p = video_mode.XResolution*video_mode.YResolution-1;
		for (; p >= 0; p--)
			video_psetp(p, 0x00000044);
		video_drawConsole();
	}

	printf("HOS 0.13 - Kernel File Size: %u kb\tData Size: %u bytes\n", kernel_size()>>10, (dword)(&_end)-(dword)(&_code));
	printf("Memory available to OS: %u MB (%u bytes)\n", mm_megabytes, mm_totalmem);
	printf("Free memory: %u bytes (%u pages)\n", mm_freemem(), mm_freemem()>>12);
	printf("Root Directory: %s/\n", rootDevice->id);
	

//	int a;
//	byte *addr = 0;
//	for (a = 0; a < 2; a++)
//	{
//		byte *app = mm_palloc();
//		vmm_map1((dword)addr, (dword)app);
//		addr += 4096;
//	}

//	addr = vfs_readFile("/bin/hash.hos");
//	memcpy(0, addr, 8192);
//	asm("call 0");


	dword key = 0;
	for (;;)
	{
		key = kbdWaitKey();
		if ((key & 0xFF) > 2)	//key is not a control key
			putc(key);
	}
}

// main Interrupt Service Routine - handles all interrupts unless caught by kernel.asm
void isr(dword num)
{
	switch(num)
	{
	case 0x20:         		// IRQ0 - timer interrupt
		timer++;
		(*(byte *)(0xc00b8000))++;
		eoi();
		break;
	case 0x21:  			// IRQ1 - keyboard interrupt
		isr_keyboard();    	//isr_keybard() takes care of calling eoi()
		break;
	case 0x2C:			// IRQ12 - PS/2 mouse
		isr_mouse();
		eoi2();
		break;
	default:
		printf("Interrupt %d (0x%x) Unhandled!!\n", num, num);
		break;
	}
}