kio.h File Reference

#include <types/nums.h>

Go to the source code of this file.

Functions
void	Kprintf (const char *fmt,...)
	Formatted output to the screen.
void	Kputchar (char c)
	Outputs a single character to the screen at the current cursor position.
void	Kcfp ()
	Clears the screen by filling the video memory with spaces.
void	KputcharBackspace ()
	Handles backspace keypress by moving the cursor back and clearing the character.
void	KprintHex (u32 num)
	Prints a 32-bit unsigned integer in hexadecimal format prefixed with "0x".
char	Kgetkey ()
	Gets the next character from the keyboard buffer (blocking).
unsigned char	ScancodeToAscii (unsigned char scancode)
void	Kgetstr (char *str, int length)
	Reads a line of input from the keyboard (blocking).
void	Kflush ()
	Flushes the keyboard controller input buffer.
void	Outb (u16 port, u8 value)
	Write a byte to the specified I/O port.
u8	Inb (u16 port)
	Read a byte from the specified I/O port.
void	Outw (u16 port, u16 value)
	Write a 16-bit word to the specified I/O port.
u16	Inw (u16 port)
	Read a 16-bit word from the specified I/O port.
void	Cli ()
	Disable CPU interrupts (clear interrupt flag).
void	Sti ()
	Enable CPU interrupts (set interrupt flag).
void	Outl (u16 port, u32 val)
	Write a 32-bit value to the specified I/O port.
u32	Inl (u16 port)
	Read a 32-bit value from the specified I/O port.

Function Documentation

Cli()

void Cli ( )

inline

Disable CPU interrupts (clear interrupt flag).

This is often used before critical sections to prevent preemption by interrupt handlers.

Definition at line 96 of file asm.c.

Inb()

u8 Inb ( u16 port )

inline

Read a byte from the specified I/O port.

Parameters

port	I/O port to read from

Returns

Byte value read

Definition at line 40 of file asm.c.

Inl()

u32 Inl ( u16 port )

inline

Read a 32-bit value from the specified I/O port.

Parameters

port	I/O port to read from

Returns

32-bit value read

Definition at line 84 of file asm.c.

Inw()

u16 Inw ( u16 port )

inline

Read a 16-bit word from the specified I/O port.

Parameters

port	I/O port to read from

Returns

16-bit value read

Definition at line 62 of file asm.c.

Kcfp()

void Kcfp

(

)

Clears the screen by filling the video memory with spaces.

Resets cursor position to the top-left corner (0,0).

Definition at line 28 of file printer.c.

Kflush()

void Kflush

(

)

Flushes the keyboard controller input buffer.

Reads and discards all unread bytes in the controller’s 0x60 port.

Definition at line 219 of file keyin.c.

Kgetkey()

char Kgetkey

(

)

Gets the next character from the keyboard buffer (blocking).

Returns

The next ASCII character from the input buffer.

Definition at line 169 of file keyin.c.

Kgetstr()

void Kgetstr	(	char *	str,
		int	length )

Reads a line of input from the keyboard (blocking).

Handles basic line editing (Enter, Backspace, Delete).

Parameters

str	Destination buffer
length	Maximum buffer length (including null terminator)

Definition at line 186 of file keyin.c.

Kprintf()

void Kprintf	(	const char *	fmt,
			... )

Formatted output to the screen.

Supports format specifiers:

• c : character
• s : string
• d : signed decimal integer
• x : unsigned hexadecimal integer
• %% : literal percent sign

Parameters

fmt	Format string
...	Variable arguments corresponding to format specifiers

Definition at line 152 of file printer.c.

KprintHex()

void KprintHex

(

u32

num

)

Prints a 32-bit unsigned integer in hexadecimal format prefixed with "0x".

Example output: 0xDEADBEEF

Parameters

num	The number to print

Definition at line 92 of file printer.c.

Kputchar()

void Kputchar

(

char

c

)

Outputs a single character to the screen at the current cursor position.

Supports newline ('
') to move cursor to the next line. Advances cursor position and scrolls screen if necessary.

Parameters

c	Character to output

Definition at line 46 of file printer.c.

KputcharBackspace()

void KputcharBackspace

(

)

Handles backspace keypress by moving the cursor back and clearing the character.

Definition at line 71 of file printer.c.

Outb()

void Outb ( u16 port, u8 val )

inline

Write a byte to the specified I/O port.

Parameters

port	I/O port to write to
val	Byte value to write

Definition at line 30 of file asm.c.

Outl()

void Outl ( u16 port, u32 val )

inline

Write a 32-bit value to the specified I/O port.

Parameters

port	I/O port to write to
val	32-bit value to write

Definition at line 74 of file asm.c.

Outw()

void Outw ( u16 port, u16 val )

inline

Write a 16-bit word to the specified I/O port.

Parameters

port	I/O port to write to
val	16-bit value to write

Definition at line 52 of file asm.c.

ScancodeToAscii()

unsigned char ScancodeToAscii

(

unsigned char

scancode

)

Sti()

void Sti ( )

inline

Enable CPU interrupts (set interrupt flag).

This is used after a critical section to re-enable interrupts. NOPs are added for minor instruction delay.

Definition at line 104 of file asm.c.