DIRQL & IRQ Line - Relationship

NTDEV
1

Hi all,

On Win2K and later (where Plug n Play & other WDM features are
available),

What would be the EXACT relationship between “IRQ Lines” and DIRQLs ?
(for eg., on x86 platforms)

Actually, I want to know,

if we take 2 IRQ Lines x & y and by Priority, if x > y, then WILL THE
DIRQL ASSIGNED TO IRQ Line “x” BE GREATER (in Priority) THAN IRQ Line
“y” *****ALWAYS***** ???

Thanks,
Sathya

2

Sathyanarayanan Srinivasan£¬

Have a look at http://www.tuningsoft.com/documents/irql.htm.

Wish it could help.

Matt

On 2002-12-19, you wrote:
= = = = = = = = = = = = = = = = = = = =

Hi all,

On Win2K and later (where Plug n Play & other WDM features are
available),

What would be the EXACT relationship between “IRQ Lines” and DIRQLs ?
(for eg., on x86 platforms)

Actually, I want to know,

if we take 2 IRQ Lines x & y and by Priority, if x > y, then WILL THE
DIRQL ASSIGNED TO IRQ Line “x” BE GREATER (in Priority) THAN IRQ Line
“y” *****ALWAYS***** ???

Thanks,
Sathya
= = = = = = = = = = = = = = = = = = = =

3

Jake,

Is the mapping of IRQs to IRQLs something that Microsoft considers to be
proprietary, or could you enlighten us with the mechanism that is used
by the various HALs (or at least the more common ones)?

  • Jay

Jay Talbott
Principal Consulting Engineer
SysPro Consulting, LLC
3519 E. South Fork Drive
Suite 201
Phoenix, AZ 85044
(480) 704-8045
xxxxx@sysproconsulting.com
http://www.sysproconsulting.com

-----Original Message-----
From: xxxxx@lists.osr.com
[mailto:xxxxx@lists.osr.com] On Behalf Of Jake Oshins
Sent: Thursday, December 26, 2002 11:11 AM
To: NT Developers Interest List
Subject: [ntdev] RE: DIRQL & IRQ Line - Relationship

It is pretty much guaranteed that the relationship will not hold.

Each HAL has its own mechanism for mapping IRQ to IRQL. And none of
them are based on the numerical value of the IRQ.

Jake Oshins
Windows Kernel Team

This posting is provided “AS IS” with no warranties, and confers no
rights.

-----Original Message-----
Subject: DIRQL & IRQ Line - Relationship
From: “Sathyanarayanan Srinivasan”

> Date: Thu, 19 Dec 2002 10:48:42 +0530
> X-Message-Number: 1
>
> Hi all,
>
> On Win2K and later (where Plug n Play & other WDM features are
> available),
>
> What would be the EXACT relationship between “IRQ Lines” and DIRQLs ?
> (for eg., on x86 platforms)
>
> Actually, I want to know,=20
>
> if we take 2 IRQ Lines x & y and by Priority, if x > y, then WILL THE
> DIRQL ASSIGNED TO IRQ Line “x” BE GREATER (in Priority) THAN IRQ Line
> “y” ALWAYS???
>
> Thanks,
> Sathya
>
>
>
> —
> You are currently subscribed to ntdev as:
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