Q1: I am developing a driver. How to create ACPI compatible driver?
A1: Main rules:
- don't set own restrictions to high IRQs > IRQ15
- read information about IRQ from PCI Config Space or from acpi.psd
How to create driver ready for SMP and APIC mode?
- Use DevEOI helper only (DevHlp_EOI), DON'T USE OUT 20h,20h
More suggestions:
- If you are going use IRQ before INIT_COMPLETE then
use PIC IRQ before, APIC IRQ after.
Query the information using FindPCIDevice()
APM:
- when you init the adapter, look at D-state in PCI,
if the adapter is in D-state (i.e. D-state != 0) then enable it.
Else the devices don't work if computer was suspended by Windows.
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Q2: There is old device driver. How to make it work in APIC?
A2: Patch it. It's necessary patch DevHlp_SetIRQ and set shared.
(This will help if DevHlp_EOI are used)
If you have asm source code with headers from DDK then
makefile should contain SMP=1
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Q3: How to create driver ready for SMP?
A3: SMP Considerations for OS/2 Device Drivers
http://www.edm2.com/0701/driver.html
(by Scott E. Garfinkle)
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Q4: How to run my R3 program on CPU 2?
A4: Use DosSetThreadAffinity function
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Q5: ACPI replaces OEMHLP$ driver. Is this new OEMHLP$ documented?
A5: The interface is not changed. DDK contains description of OEMHLP.
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Q6: How to find COM-port in ACPI tree
A6: Example:
We looked into the acpitree output to find the com port of the digitizer.
+*DTR_ T:[Device] HID:[WACF004] STA:[0xd] SxD State:[0xff:ff:ff:ff]
Current state:
> IO:[1 0x200 - 0x200 Al:1 Len:8]
>Trigger by Edge, Polarity High IRQ-4
> ENDTAG
thx Wim Brul
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