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IOMallocAligned casuses kernel trap

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IOMallocAligned casuses kernel trap

Subject: IOMallocAligned casuses kernel trap
From: Dinesh Bhat <email@hidden>
Date: Tue, 15 Aug 2006 11:33:29 -0500
Organization: Linear Systems

Hello all,

I am writing a PCI device driver to transfer data from the board memory to the system memory. I am trying to allocate a wired page to transfer data. I do not have any code for transfer yet. After adding set_Page = (UInt32*)IOMallocAligned(PAGE_SIZE,PAGE_SIZE) line, when I loaded the kext kernel crashed. I then tried IOMalloc as well as IOMallocPageable to check if they work. All of them result in kernel crash. Can anyone tell what I am doing wrong here? I read in kernel programming on Mac (pdf document) that IOMallocAligned should not be used. But that document did not say anything about IOMallocPageable.

Any pointers?

Thanks,

Dinesh


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