From: Michael Walle <michael@walle.cc>
To: Blue Swirl <blauwirbel@gmail.com>
Cc: "Edgar E. Iglesias" <edgar.iglesias@gmail.com>,
Richard Henderson <rth@twiddle.net>,
qemu-devel@nongnu.org, Alexander Graf <agraf@suse.de>
Subject: Re: [Qemu-devel] [PATCH 14/17] lm32: todo and documentation
Date: Fri, 11 Feb 2011 23:45:45 +0100 [thread overview]
Message-ID: <201102112345.45323.michael@walle.cc> (raw)
In-Reply-To: <AANLkTinGcJZH3FG4Ytm5sptd5JEz3VaqfsMWXZEvAB8Q@mail.gmail.com>
Am Freitag 11 Februar 2011, 21:41:14 schrieb Blue Swirl:
> > +Special instructions
> > +--------------------
> > +The translation recognizes one special instruction to halt the cpu:
> > + and r0, r0, r0
> > +On real hardware this instruction is a nop. It is not used by GCC and
> > +should (hopefully) not be used within hand-crafted assembly.
> > +Insert this instruction in your idle loop to reduce the cpu load on the
> > +host.
>
> It would be better to use MMIO or privileged instruction for this
> instead of changing an unprivileged instruction.
MMIO can't be used as that would have an impact on real hardware? The idea is
to use this instruction for both the real hardware and QEMU.
--
Michael
next prev parent reply other threads:[~2011-02-11 22:45 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-10 23:11 [Qemu-devel] [PATCH 00/17 v2] LatticeMico32 target Michael Walle
2011-02-10 23:11 ` [Qemu-devel] [PATCH 01/17] LatticeMico32 target support Michael Walle
2011-02-10 23:11 ` [Qemu-devel] [PATCH 02/17] lm32: translation routines Michael Walle
2011-02-11 21:42 ` Blue Swirl
2011-02-11 22:23 ` Michael Walle
2011-02-12 6:49 ` Blue Swirl
2011-02-17 22:51 ` Michael Walle
2011-03-11 5:57 ` Alexander Graf
2011-03-16 23:08 ` Michael Walle
2011-03-16 23:48 ` Alexander Graf
2011-02-12 13:18 ` Michael Walle
2011-02-10 23:11 ` [Qemu-devel] [PATCH 03/17] lm32: translation code helper Michael Walle
2011-02-10 23:11 ` [Qemu-devel] [PATCH 04/17] lm32: machine state loading/saving Michael Walle
2011-02-10 23:11 ` [Qemu-devel] [PATCH 05/17] lm32: gdbstub support Michael Walle
2011-02-10 23:11 ` [Qemu-devel] [PATCH 06/17] lm32: interrupt controller model Michael Walle
2011-02-11 21:49 ` Blue Swirl
2011-02-10 23:12 ` [Qemu-devel] [PATCH 07/17] lm32: juart model Michael Walle
2011-02-11 21:09 ` Blue Swirl
2011-02-10 23:12 ` [Qemu-devel] [PATCH 08/17] lm32: pic and juart helper functions Michael Walle
2011-02-11 20:57 ` Blue Swirl
2011-02-10 23:12 ` [Qemu-devel] [PATCH 09/17] lm32: timer model Michael Walle
2011-02-11 21:22 ` Blue Swirl
2011-02-11 22:29 ` Michael Walle
2011-02-12 6:56 ` Blue Swirl
2011-02-10 23:12 ` [Qemu-devel] [PATCH 10/17] lm32: uart model Michael Walle
2011-02-11 21:16 ` Blue Swirl
2011-02-10 23:12 ` [Qemu-devel] [PATCH 11/17] lm32: system control model Michael Walle
2011-02-11 21:03 ` Blue Swirl
2011-02-11 22:35 ` Michael Walle
2011-02-12 7:54 ` Blue Swirl
2011-02-10 23:12 ` [Qemu-devel] [PATCH 12/17] lm32: support for creating device tree Michael Walle
2011-02-11 20:52 ` Blue Swirl
2011-02-11 22:40 ` Michael Walle
2011-02-12 7:56 ` Blue Swirl
2011-02-10 23:12 ` [Qemu-devel] [PATCH 13/17] lm32: EVR32 and uclinux BSP Michael Walle
2011-02-11 20:47 ` Blue Swirl
2011-02-10 23:12 ` [Qemu-devel] [PATCH 14/17] lm32: todo and documentation Michael Walle
2011-02-11 20:41 ` Blue Swirl
2011-02-11 22:45 ` Michael Walle [this message]
2011-02-12 8:00 ` Blue Swirl
2011-02-10 23:12 ` [Qemu-devel] [PATCH 15/17] lm32: opcode testsuite Michael Walle
2011-02-10 23:12 ` [Qemu-devel] [PATCH 16/17] Add lm32 target to configure Michael Walle
2011-02-10 23:12 ` [Qemu-devel] [PATCH 17/17] MAINTAINERS: add LatticeMico32 maintainer Michael Walle
2011-02-11 9:48 ` [Qemu-devel] Re: [PATCH 00/17 v2] LatticeMico32 target Edgar E. Iglesias
-- strict thread matches above, loose matches on Subject: below --
2011-02-17 22:45 [Qemu-devel] [PATCH 00/17 v3] " Michael Walle
2011-02-17 22:45 ` [Qemu-devel] [PATCH 14/17] lm32: todo and documentation Michael Walle
2011-01-31 0:30 [Qemu-devel] [PATCH 00/17] LatticeMico32 target Michael Walle
2011-01-31 0:30 ` [Qemu-devel] [PATCH 14/17] lm32: todo and documentation Michael Walle
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