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Re: [Qemu-devel] [Qemu-ppc] [PATCH v3 11/14] ioport: Switch dispatching
From: |
Anthony Liguori |
Subject: |
Re: [Qemu-devel] [Qemu-ppc] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer |
Date: |
Fri, 12 Jul 2013 14:06:39 -0500 |
User-agent: |
Notmuch/0.15.2+202~g0c4b8aa (http://notmuchmail.org) Emacs/23.3.1 (x86_64-pc-linux-gnu) |
Hervé Poussineau <address@hidden> writes:
> When only one of them is changed, this means some "interesting" things
> can happen. For example, in [1]:
> "When PowerPC little-endian is in effect but before system's
> little-endian is in effect, the address munge becomes effective. If we
> need to access system endian port (byte) address, say 0x80000092, the
> program needs to issue 0x80000095 instead, to compensate (unmunge) for
> the effect of PowerPC address modification."
>
> Those will be required for QEMU to be able to run BeOS, AIX, or Windows
> NT or PowerPC PReP.
>
> In the light of this, I think there should only be one endianness for
> all memory accesses (which could be changed at runtime),
We already do this, it's "host native endian".
> and all
> bridges/devices should ask for "same endianness as parent" or "reverse
> endianness as parent", but not for big, little, or native endianness.
I/O doesn't propagate so there's no way to say something like this.
That's the fundamental problem IMHO.
Regards,
Anthony Liguori
>
> Regards,
>
> Hervé
>
> [1] ftp://ftp.software.ibm.com/rs6000/technology/spec/endian.ps)
- Re: [Qemu-devel] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer, (continued)
- Re: [Qemu-devel] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer, Alexander Graf, 2013/07/11
- Re: [Qemu-devel] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer, Andreas Färber, 2013/07/11
- Re: [Qemu-devel] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer, Alexander Graf, 2013/07/11
- Re: [Qemu-devel] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer, Alexander Graf, 2013/07/11
- Re: [Qemu-devel] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer, Alexander Graf, 2013/07/11
- Re: [Qemu-devel] [Qemu-ppc] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer, Benjamin Herrenschmidt, 2013/07/11
- Re: [Qemu-devel] [Qemu-ppc] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer, Benjamin Herrenschmidt, 2013/07/11
- Re: [Qemu-devel] [Qemu-ppc] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer, Alexander Graf, 2013/07/11
- Re: [Qemu-devel] [Qemu-ppc] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer, Benjamin Herrenschmidt, 2013/07/12
- Re: [Qemu-devel] [Qemu-ppc] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer, Hervé Poussineau, 2013/07/12
- Re: [Qemu-devel] [Qemu-ppc] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer,
Anthony Liguori <=
- Re: [Qemu-devel] [Qemu-ppc] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer, Benjamin Herrenschmidt, 2013/07/12
- Re: [Qemu-devel] [Qemu-ppc] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer, Benjamin Herrenschmidt, 2013/07/12
- Re: [Qemu-devel] [Qemu-ppc] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer, Anthony Liguori, 2013/07/12
- Re: [Qemu-devel] [Qemu-ppc] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer, Peter Maydell, 2013/07/12
- Re: [Qemu-devel] [Qemu-ppc] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer, Benjamin Herrenschmidt, 2013/07/12
- Re: [Qemu-devel] [Qemu-ppc] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer, Peter Maydell, 2013/07/12
- Re: [Qemu-devel] [Qemu-ppc] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer, Benjamin Herrenschmidt, 2013/07/12
- Re: [Qemu-devel] [Qemu-ppc] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer, Anthony Liguori, 2013/07/15
- Re: [Qemu-devel] [Qemu-ppc] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer, Peter Maydell, 2013/07/15
- Re: [Qemu-devel] [Qemu-ppc] [PATCH v3 11/14] ioport: Switch dispatching to memory core layer, Benjamin Herrenschmidt, 2013/07/15