asm.c File Reference

#include <io/kio.h>
#include <types/nums.h>

Go to the source code of this file.

Functions
void	Outb (u16 port, u8 val)
	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 val)
	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	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.
void	Cli ()
	Disable CPU interrupts (clear interrupt flag).
void	Sti ()
	Enable CPU interrupts (set interrupt flag).

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.

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.

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.