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From: mdaljeet@in.ibm.com
To: linux-kernel@vger.kernel.org
Subject: virt_to_bus and virt_to_phys on Apple G4 target
Date: Tue, 3 Jul 2001 11:27:56 +0530	[thread overview]
Message-ID: <CA256A7E.0020F52C.00@d73mta01.au.ibm.com> (raw)

I am running linux 2.4.2 on Apple G4 machine. I think the 'PCI bus
addresses' and 'physical addresses' are same on this architecture. I
expected the two be different but according to asm/io.h 'virt_to_bus(addr)
= virt_to_phys(addr) + PCI_DRAM_OFFSET'. I printed the value of
'PCI_DRAM_OFFSET' and that come out to be zero. Is this correct?

If I somehow get the physical address of a user space buffer in a module
and take this as a PCI bus address, will I be able to do DMA properly?

thanks,
Daljeet.



             reply	other threads:[~2001-07-03  6:02 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2001-07-03  5:57 mdaljeet [this message]
2001-07-03  7:18 ` David S. Miller
2001-07-04 22:03   ` acmay
2001-07-04  7:56 ` Paul Mackerras

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