kernel.c File Reference

Simple 16 bit kernel for BIOS. More...

#include <io.h>
#include "../include/string.h"
#include "../include/stdlib.h"
#include <conio.h>
#include "interrupts.h"
#include "fs.h"

Include dependency graph for kernel.c:

Go to the source code of this file.

Macros
#define	KERNEL   1
#define	KERNEL_ADDRESS   0
#define	PROGRAMS_MAX   7
	Maximal number of programs running simultaneously. More...

Functions
int	load (Byte beginSector, Byte track, int parameter, int size, int segment)
int	gets (char *str, int size)
void	reset ()
	Reset OS to kernel.
__int void	timer (struct interruptFrame *frame)
	Interruption is called 18 times per second. More...
__int void	shiftPrtSc (struct interruptFrame *frame)
	Shift + PrintScreen handler. More...
__int void	ctrlBreak (struct interruptFrame *frame)
	Ctrl + Break handler. More...
__start void	main ()
void	__printf (int a)
	Function for int 0x20 AH=3 see io.h printf() More...

Variables
bool	programsMap [PROGRAMS_MAX]

Detailed Description

Simple 16 bit kernel for BIOS.

Author

Jaclav

Date

2023-06-10

Copyright

Copyright (c) 2023

Bug:

cannot give string literal to char* parameter, only int WHY!?

cannot use * as pointers, int only

Definition in file kernel.c.

Macro Definition Documentation

PROGRAMS_MAX

#define PROGRAMS_MAX   7

Maximal number of programs running simultaneously.

1 segment for 1 program causes lack of segments https://wiki.osdev.org/Memory_Map_(x86)

Definition at line 32 of file kernel.c.

Function Documentation

__printf()

void __printf

(

int

a

)

Function for int 0x20 AH=3 see io.h printf()

Parameters

a	address of first parameter on stack, nth parameter is a+4n

Todo:

do it with dll

Definition at line 346 of file kernel.c.

ctrlBreak()

__int void ctrlBreak

(

struct interruptFrame *

frame

)

Ctrl + Break handler.

It's called from int 9 see H-09 interrupts.a RBIL

https://www.stanislavs.org/helppc/int_1b.html

Bug:

doesn't work on bochs

Definition at line 123 of file kernel.c.

main()

__start void main

(

)

set interruption flag

Definition at line 131 of file kernel.c.

shiftPrtSc()

__int void shiftPrtSc

(

struct interruptFrame *

frame

)

Shift + PrintScreen handler.

It's called from int 9 see H-09 interrupts.a RBIL

Bug:

doesn't work on bochs

Definition at line 112 of file kernel.c.

timer()

__int void timer

(

struct interruptFrame *

frame

)

Interruption is called 18 times per second.

see B-1C interrupts.e RBIL

Todo:

It should switch between processes, add multithreading

Definition at line 61 of file kernel.c.