Bitwise.c File Reference

Functions for bit-level operations. More...

#include "pch.h"

Functions
INT	TestBit (INT BitNumber, ULONG *Addr)
	Check whether the bit is set or not.
VOID	ClearBit (INT BitNumber, ULONG *Addr)
	unset the bit
VOID	SetBit (INT BitNumber, ULONG *Addr)
	set the bit

Detailed Description

Functions for bit-level operations.

Author

Sina Karvandi (sina@.nosp@m.hype.nosp@m.rdbg..nosp@m.org)

Version

0.2

Date

2023-04-27

Copyright

This project is released under the GNU Public License v3.

Function Documentation

ClearBit()

VOID ClearBit	(	INT	BitNumber,
		ULONG *	Addr )

unset the bit

Parameters

BitNumber
Addr

{
    BITMAP_ENTRY(BitNumber, Addr) &= ~(1UL << BITMAP_SHIFT(BitNumber));
}

SetBit()

VOID SetBit	(	INT	BitNumber,
		ULONG *	Addr )

set the bit

Parameters

BitNumber
Addr

{
    BITMAP_ENTRY(BitNumber, Addr) |= (1UL << BITMAP_SHIFT(BitNumber));
}

TestBit()

INT TestBit	(	INT	BitNumber,
		ULONG *	Addr )

Check whether the bit is set or not.

Parameters

BitNumber
Addr

Returns

INT

{
    return (BITMAP_ENTRY(BitNumber, Addr) >> BITMAP_SHIFT(BitNumber)) & 1;
}