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From: "Cho, joon-woo" <jwc@core.kaist.ac.kr>
To: <linux-kernel@vger.kernel.org>
Subject: [Q] Question about memory access
Date: Mon, 4 Aug 2003 16:14:14 +0900	[thread overview]
Message-ID: <00a001c35a58$02c20f00$a5a5f88f@core8fyzomwjks> (raw)

Hello.

I am highly curious about memory access problem.

Maybe this is not exactly 'kernel' development problem, but I think this is
highly

related to 'kernel'.


Anyway my question is below.

If someone want to transfer large data from some device to memory, he may
use DMA method.

At this point, i am confused.

I think that only one process can access physical memory(RAM) at a time.

During DMA data transferring(This may need  long time), how can other
physical memory access occurs?

I think that this is solved by time-sharing, process switching, or etc. Is
it true?

Please say abstract mechanism or kernel code location about this problem.


My english is poor, so question meaning may be confused. I am sorry about
this.

Please answer my question. Thanks!



             reply	other threads:[~2003-08-04  7:18 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2003-08-04  7:14 Cho, joon-woo [this message]
2003-08-04  9:35 ` Gianni Tedesco
2003-08-04 16:18   ` Antonio Vargas
2003-08-05  0:13     ` jw schultz
2003-08-05 16:23       ` Antonio Vargas

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