It would have been quite simple to expose a spinlock-protected access to PCI
space, no ? Some people do need low level access, and it’s up to the
operating system to find a way of granting that access. I find it a terrible
idea to restrict kernel developers to only call API entry points - a
driver’s lower edge should be able talk to the iron whenever deemed
necessary by the developer.
Alberto.
-----Original Message-----
From: Phil Barila [mailto:xxxxx@Seagate.com]
Sent: Thursday, June 12, 2003 11:26 AM
To: NT Developers Interest List
Subject: [ntdev] Re: Access to the ISA Bus from a driver for a PCI
device
“Sam Tertzakian” wrote in message
news:xxxxx@ntdev…
>
> No, there is no function driver for the device. I cannot believe that
> something that I have done for years is not possible now! I cannot just
> write a normal function driver because I must access the device during
> ISRs and DPC of my PCI device.
Just because you could do it for years, doesn’t mean it was a good idea. UM
apps could do anything they wanted to any hardware they wanted back in the
“Good Old Days” of DOS. You want to return to those thrilling days?
> There should be a way to do the work of the HalAssignSlotResources()
> function using some other mechanism, right…I just need some kind of
> handle to the ISA bus, I think.
Stop thinking in DOS. Write your ISA device function driver, just make sure
it can be called at elevated IRQLs. Send your IRP_MN_QUERY_INTERFACE to the
ISA driver from your PCI device driver, and then call that interface
directly.
Phil
–
Philip D. Barila
Seagate Technology, LLC
(720) 684-1842
As if I need to say it: Not speaking for Seagate.
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