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Date: Tue, 3 Mar 2009 12:22:18 +0100 From: protagora27 protagora27 <protagora27@...il.com> To: linux-kernel@...r.kernel.org Subject: memory allocation over 4gb under x86_64 Hello folks, I have a 64 bit dma that I have to program with 64 bit physical address beyond 4 gb because I have to test dma with memory allocation beyond 4 gb. I 'm using linux x86_64 2.6.24 and I have 8 gb ram. How can I allocate physical dma memory beyond 4gb ? In x86_64 can I use __pa to have physical address ? I have used kmalloc giving virtual address : ffff810225d10340 and using __pa i have: 225d10340 that is over 8 gb . Does it mean that kmalloc return address is not linear mapped with phys ram ? I would like to find a function that returns a physical adddres beyond 4gb and then i write phys address in dma register . Thanks. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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