Miniport WAN Driver

device driver

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  • 1. FilterAttach gives 0x80070032, different results on different computers, same code
    given usermode program tester.exe and kernel minifilter tester.sys and tester.inf, and cleaning out all tester.* from c:\winnt\*, and removing all pertinant "tester" fom the registery, using the same compiled code on two machines, I install the usermode program (which is a service) and the driver with: sc create testerService binpath= c:\tester\tester.exe rundll32.exe setupapi,InstallHinfSection DefaultInstall 132 c:\tester \tester.inf sc queryex testerService sc queryex testerDriver and both are loaded. Everything else I can think of being equal, upon starting the service, one machine calls FilterAttach() successfully and one machine receives 0x80070032 from FilterAttach() !!! What to do!? it appears that the returned hr is encoding ERROR_NOT_SUPPORTED, so what to do! I can find ZERO documentation on this behavior short of my previous and somewhat related post. the difference being that this error is being received not on a single attempted FilterAttach().
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  • 3. Error Handling In Port Monitor
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  • 5. Will DMA transfer diable the CPU completely as if it has been revoved from the socket?
    Below is my understanding, but I am not sure of its validity. I hope to get some comments from you. Provided that a program want to start a DMA transfer. 1, CPU sends a start command to a DMAC (DMA Controller); 2, The DMAC signals the CPU through the HOLD pin and waits for the CPU's acknowledgement; 3, CPU signals the DMAC through the HLDA pin; 4, Upon receiving HLDA, the DMAC starts to DMA transfer. From now on, the CPU stops all its activities. Until the DMA process is finished, all the interrupts can not get responses. But, the CPU's internal status are kept, and all the interrupts' status are also kept. 5, Upon finishing the DMA transfer, the DMAC deactivate the HOLD pin, the CPU continues to execute its instructions. My question is the same as the title: Will DMA transfer diable the CPU completely as if it has been revoved from the socket?

Miniport WAN Driver

Postby Nicolas Collignon » Sat, 07 Aug 2004 20:47:36 GMT

Hi,

I'm developping a NDISWAN miniport adapter, it creates PPP tunnels
through a TCP stream.
So all pretty works, i have my new connection but ...
When i update device driver using devcon tool, and restart the PPP
connection, windows simply freeze without breaking in de{*filter*}: no
error, no warning, no exception.
!thread command always show "svchost.exe" process.
I guess what append is that windows re-*set* ? "Use default Gateway of
remote server" option on this connection which create a loop because my
tunnel go back to userland in order to use TCP stream.

But .. the checkbox is not checked on connection property dialog box.
If i reboot all works fine.

Any idea where this can come from ?

thankx, bye

-- cl



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