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Message-ID: <3E5FCB05.6070806@acm.org>
Date: Fri, 28 Feb 2003 14:48:05 -0600
From: Corey Minyard <minyard@acm.org>
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To: "Grover, Andrew" <andrew.grover@intel.com>
CC: Jeff Garzik <jgarzik@pobox.com>, linux-kernel@vger.kernel.org
Subject: Re: ACPI request/release generic address
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Grover, Andrew wrote:

|>From: Jeff Garzik [mailto:jgarzik@pobox.com]
|>Can you define a generic address?
|>
|>IIRC, ACPI needs some work in this area.
|>
|>If the "generic address" is host RAM, that's easy.
|>If the generic address is PIO address, that's mostly easy.
|>If the generic address is MMIO address, that takes a bit of care with
|>mapping, and I'm not sure ACPI gets it right in these cases.
|
|
|The Generic Address Structure (GAS) is basically a 64 bit address and a
|type field. The type can be:
|
|System memory
|System IO
|PCI Config space
|Embedded Controller
|SMBus
|Functional fixed hardware
|
|I don't think this will very easily handle a clean request/release API.
|Corey, what is the specific table you are concerned with? At least with
|the GASes ACPI uses internally, they point to resource regions already
|marked as used via other means (e820 or _CRS, for example.)

This is for some IPMI (Intelligent Platform Management Interface) hardware.
It's address is specified in an ACPI table.

- -Corey
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