linux-kernel - CPU Initiated DMA

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <87mxncv3ge.fsf@inspiron.ap.columbia.edu>
Date:	Fri, 07 Jan 2011 15:55:29 -0500
From:	Nikolaus Rath <Nikolaus@...h.org>
To:	linux-kernel@...r.kernel.org
Subject: CPU Initiated DMA

Hello,

I want to write a driver for a rather dumb PCI card, which cannot become
bus master itself. Is it possible to use a DMA controller on the
mainboard to still transfer data to the card without occupying the CPU?

(I believe this is the way DMA used to work on ISA cards, but do recent
x86 systems still have a DMA controller for the CPU?)

Any pointers are greatly appreciated. I looked into "Linux Device
Drivers", but the DMA chapter seems to be only about the device becoming
busmaster.

Best,

   -Nikolaus

-- 
 »Time flies like an arrow, fruit flies like a Banana.«

  PGP fingerprint: 5B93 61F8 4EA2 E279 ABF6  02CF A9AD B7F8 AE4E 425C

--
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/