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From: Ramy Sameh <ramysameh26@gmail.com>
Date: Sun, 15 Oct 2017 20:49:31 +0200
Message-ID: <CAF6HrYwPtrQU-wsTmSQcmoSC+7d7CHp-oVa6ksk+PG6_Q48WFQ@mail.gmail.com>
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Subject: Re: [Qemu-devel] Reading and writing functions for QEMU emulated
 peripherals
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To: Peter Maydell <peter.maydell@linaro.org>
Cc: QEMU Developers <qemu-devel@nongnu.org>, Mona Safar <Mona.Safar@eng.asu.edu.eg>, Ahmed Aly <ahmedaly50@gmail.com>, Watheq <watheq@gmail.com>

Many thanks Peter

On Sun, Oct 15, 2017 at 6:50 PM, Peter Maydell <peter.maydell@linaro.org>
wrote:

> On 15 October 2017 at 17:47, Ramy Sameh <ramysameh26@gmail.com> wrote:
> > I was tracking the calling of function pl011_read, and I noticed that it
> is
> > called from function *memory_region_read_accessor *in memory.c
> >
> > I also noticed that all peripherals reading functions (e.g. pl050_read,
> > pl190_read ... etc) in the emulated VersatilePB board, are called from
> the
> > same location in *memory_region_read_accessor.*
> >
> > *My question is*: Is this calling procedure done for the emulated
> > VersatilePB board *only*, or this is the case for the peripherals in all
> > emulated systems ?
>
> Broadly speaking, yes, all peripheral device read and write
> functions are invoked via the memory subsystem code (which
> is the part of QEMU that figures out what memory region
> covers whatever the physical address that the guest wrote
> to is).
>
> thanks
> -- PMM
>



-- 
Best Regards,
Ramy Sameh
Embedded Software Engineer
+2-010-172-777-14