Date: Tue, 15 Jul 2003 11:20:19 +0900 From: User Takawata <takawata@axe-inc.co.jp> To: Nate Lawson <nate@root.org> Cc: current@freebsd.org Subject: Re: newbus questions Message-ID: <200307150220.LAA18903@axe-inc.co.jp> In-Reply-To: Your message of "Mon, 14 Jul 2003 17:36:02 MST." <20030714173017.F18544@root.org>
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In message <20030714173017.F18544@root.org>, Nate Lawson wrote:
>I'm working on ECDT support for ACPI and ran into a couple newbus-related
>questions.
>
>1. I'm using the identify entry as a way to get called early on in the
>boot process. However, this does not happen before $PIR evaluation. How
>should I hook in a routine for pre-$PIR execution?
It may be called in
if (ACPI_FAILURE(status = AcpiInstallAddressSpaceHandler(ACPI_ROOT_OBJECT,
ACPI_ADR_SPACE_PCI_CONFIG,
ACPI_DEFAULT_HANDLER,
NULL, NULL))) {
device_printf(dev, "could not initialise PciConfig handler: %s\n", AcpiF
ormatException(status));
goto out;
at acpi_attach().
>2. I need to call bus_alloc_resource() to get access to some io ports.
>However, calling BUS_READ_IVAR in the identify routine gets a bad pointer
>deref. So how do I get a handle to use for allocating the IO ports
>(first arg of bus_alloc_resource)?
If you want to use IDENTIFY method, you have to imprement
'bus_driver_added' method on parent driver to initialize ivars in
device object.
>3. It appears bus_alloc_resource() takes a range of values. If I know the
>exact value to use, I request it via "value, value" instead of "0, ~0".
>Is this correct?
It is correct in that context. When parent driver enumlate device and
set the resorce for device, That is used for allocate 'default' resource.
>The framework for this code is in ec_identify() and ec_attach() in
>sys/dev/acpica/acpi_ec.c.
You may want to set up ACPI EC register space before ACPI name space is
probed. So I think it is possible to call the initialization routine
in acpi_attach() explicitly for the time being.
The generalized way is that we have to imprement simple ACPI table
parser other than DSDT that is used before ACPI-CA initialization.
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