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| From | Clemens Ladisch <clemens@ladisch.de> |
| Newsgroups | comp.os.linux.misc, comp.os.linux.hardware |
| Subject | Re: Realtime clock accessible without context-switch? |
| Date | Tue, 20 May 2014 21:56:48 +0200 |
| Lines | 14 |
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Cross-posted to 2 groups.
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Charles T. Smith wrote: > Is there a way to access (say on Intel platforms) the realtime clock > without using a special device driver, but simply with non-synchronized > memory access? On IBM-PC compatible machines, the RTC lives in the good ol' ISA I/O space, which cannot be memory-mapped. When doing ISA I/O accesses, the switch to kernel mode is _not_ the bottleneck. If you want to avoid it anyway, use iopl and inb/outb. Regards, Clemens
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Realtime clock accessible without context-switch? "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2014-05-20 10:29 +0000
Re: Realtime clock accessible without context-switch? Clemens Ladisch <clemens@ladisch.de> - 2014-05-20 21:56 +0200
Re: Realtime clock accessible without context-switch? "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2014-05-21 07:29 +0000
Re: Realtime clock accessible without context-switch? Thomas Richter <thor@math.tu-berlin.de> - 2014-05-21 09:47 +0200
Re: Realtime clock accessible without context-switch? William Unruh <unruh@invalid.ca> - 2014-05-21 15:51 +0000
Re: Realtime clock accessible without context-switch? Clemens Ladisch <clemens@ladisch.de> - 2014-05-21 19:32 +0200
Re: Realtime clock accessible without context-switch? Richard Kettlewell <rjk@greenend.org.uk> - 2014-05-21 23:35 +0100
Re: Realtime clock accessible without context-switch? "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2014-05-22 07:53 +0000
Re: Realtime clock accessible without context-switch? Clemens Ladisch <clemens@ladisch.de> - 2014-05-22 20:36 +0200
Re: Realtime clock accessible without context-switch? Richard Kettlewell <rjk@greenend.org.uk> - 2014-05-22 20:26 +0100
Re: Realtime clock accessible without context-switch? William Unruh <unruh@invalid.ca> - 2014-05-22 22:48 +0000
Re: Realtime clock accessible without context-switch? Jan Pieter <jp@jp.dhs.orig> - 2014-06-01 09:58 +0200
Re: Realtime clock accessible without context-switch? Todd <Todd@invalid.invalid> - 2014-05-23 14:20 -0700
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