RE: (reposting) how to get DMA'able memory within 4GB on 64-bit m

[MEHTA,HIREN]

Then why do we have 64-bit dma_addr_t on ia64 ?

-hiren

-----Original Message-----
From: David S. Miller [mailto:[e-mail]]
Sent: Wednesday, June 27, 2001 2:26 PM
To: MEHTA,HIREN (A-SanJose,ex1)
Cc: '[e-mail]'
Subject: Re: (reposting) how to get DMA'able memory within 4GB on 64-bit
machi ne

MEHTA,HIREN (A-SanJose,ex1) writes:
 > Is there a way for a driver to ask kernel to
 > give DMA'able memory within 4GB ? I read about
 > pci_alloc_consistent(). But I could not find out
 > whether that guarantees the DMA'able memory to be
 > within 4GB or not. Is there any other kernel routine
 > that I should call from Driver to get such a memory ?

All of the pci_*() DMA allocation/mapping interfaces give you
32-bit PCI dma addresses.

Later,
David S. Miller
[e-mail]