Re: User mode drivers: part 2: PCI device handling (patch 1/2 for2.6.11)

From: Albert Cahalan
Date: Fri Mar 11 2005 - 00:34:12 EST

Peter Chubb writes:

> There are three new system calls:
> long usr_pci_open(int bus, int slot, int function, __u64 dma_mask);
> Returns a filedescriptor for the PCI device described
> by bus,slot,function. It also enables the device, and sets it
> up as a bus-mastering DMA device, with the specified dma mask.

You forgot the PCI domain (a.k.a. hose, phb...) number.
Also, you might encode bus,slot,function according to
the PCI spec. So that gives:

long usr_pci_open(unsigned pcidomain, unsigned devspec, __u64 dmamask);

(with the user library returning an int instead of long)

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