[v1] Declare device little or big endian

[Qemu-devel] [PATCH 04/19] hw/core: Declare device little or big endian

Tony Nguyen posted 19 patches 6 years, 2 months ago

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Maintainers: Fabien Chouteau <chouteau@adacore.com>, "Philippe Mathieu-Daudé" <philmd@redhat.com>, Jiri Slaby <jslaby@suse.cz>, Max Reitz <mreitz@redhat.com>, Subbaraya Sundeep <sundeep.lkml@gmail.com>, Kevin Wolf <kwolf@redhat.com>, Andrzej Zaborowski <balrogg@gmail.com>, David Gibson <david@gibson.dropbear.id.au>, Alberto Garcia <berto@igalia.com>, Paolo Bonzini <pbonzini@redhat.com>, "Cédric Le Goater" <clg@kaod.org>, Peter Maydell <peter.maydell@linaro.org>, Michael Walle <michael@walle.cc>, Gerd Hoffmann <kraxel@redhat.com>, Aleksandar Rikalo <arikalo@wavecomp.com>, Andrew Jeffery <andrew@aj.id.au>, Andrew Baumann <Andrew.Baumann@microsoft.com>, "Hervé Poussineau" <hpoussin@reactos.org>, John Snow <jsnow@redhat.com>, Aleksandar Markovic <amarkovic@wavecomp.com>, "Marc-André Lureau" <marcandre.lureau@redhat.com>, Beniamino Galvani <b.galvani@gmail.com>, Guan Xuetao <gxt@mprc.pku.edu.cn>, "Edgar E. Iglesias" <edgar.iglesias@gmail.com>, Joel Stanley <joel@jms.id.au>, KONRAD Frederic <frederic.konrad@adacore.com>, Jason Wang <jasowang@redhat.com>, Artyom Tarasenko <atar4qemu@gmail.com>, Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>, Igor Mitsyanko <i.mitsyanko@gmail.com>, "Michael S. Tsirkin" <mst@redhat.com>, Alistair Francis <alistair@alistair23.me>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, Peter Chubb <peter.chubb@nicta.com.au>, Fam Zheng <fam@euphon.net>

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[Qemu-devel] [PATCH 04/19] hw/core: Declare device little or big endian

Posted by Tony Nguyen 6 years, 2 months ago

For each device declared with DEVICE_NATIVE_ENDIAN, find the set of
targets from the set of target/hw/*/device.o.

If the set of targets are all little or all big endian, re-declare
as DEVICE_LITTLE_ENDIAN or DEVICE_BIG_ENDIAN respectively.

Then, on inspection:
- if ununsed, re-declare as DEVICE_HOST_ENDIAN.
- if max/min size=1, re-declare as DEVICE_HOST_ENDIAN.
- if just a bit bucket, re-delcare as DEVICE_HOST_ENDIAN
- if PCI, re-declare as DEVICE_LITTLE_ENDIAN.
- if for {ARM|unicore32} only, re-declare as DEVICE_LITTLE_ENDIAN.
- if for SPARC only, re-declare as DEVICE_BIG_ENDIAN.

Signed-off-by: Tony Nguyen <tony.nguyen@bt.com>
---
 hw/core/empty_slot.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/core/empty_slot.c b/hw/core/empty_slot.c
index 3ba450e1ca..2785b6acf9 100644
--- a/hw/core/empty_slot.c
+++ b/hw/core/empty_slot.c
@@ -49,7 +49,7 @@ static void empty_slot_write(void *opaque, hwaddr addr,
 static const MemoryRegionOps empty_slot_ops = {
     .read = empty_slot_read,
     .write = empty_slot_write,
-    .endianness = DEVICE_NATIVE_ENDIAN,
+    .endianness = DEVICE_HOST_ENDIAN,
 };
 
 void empty_slot_init(hwaddr addr, uint64_t slot_size)
-- 
2.23.0

Re: [Qemu-devel] [PATCH 04/19] hw/core: Declare device little or big endian

Posted by Philippe Mathieu-Daudé 6 years, 1 month ago

On 8/26/19 4:21 PM, Tony Nguyen wrote:
> For each device declared with DEVICE_NATIVE_ENDIAN, find the set of
> targets from the set of target/hw/*/device.o.
> 
> If the set of targets are all little or all big endian, re-declare
> as DEVICE_LITTLE_ENDIAN or DEVICE_BIG_ENDIAN respectively.
> 
> Then, on inspection:
> - if ununsed, re-declare as DEVICE_HOST_ENDIAN.

In all the series: 'ununsed' -> 'unused'


> - if max/min size=1, re-declare as DEVICE_HOST_ENDIAN.
> - if just a bit bucket, re-delcare as DEVICE_HOST_ENDIAN

In all the series: 're-delcare' -> 're-declare'

> - if PCI, re-declare as DEVICE_LITTLE_ENDIAN.
> - if for {ARM|unicore32} only, re-declare as DEVICE_LITTLE_ENDIAN.
> - if for SPARC only, re-declare as DEVICE_BIG_ENDIAN.
> 
> Signed-off-by: Tony Nguyen <tony.nguyen@bt.com>
> ---
>   hw/core/empty_slot.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/hw/core/empty_slot.c b/hw/core/empty_slot.c
> index 3ba450e1ca..2785b6acf9 100644
> --- a/hw/core/empty_slot.c
> +++ b/hw/core/empty_slot.c
> @@ -49,7 +49,7 @@ static void empty_slot_write(void *opaque, hwaddr addr,
>   static const MemoryRegionOps empty_slot_ops = {
>       .read = empty_slot_read,
>       .write = empty_slot_write,
> -    .endianness = DEVICE_NATIVE_ENDIAN,
> +    .endianness = DEVICE_HOST_ENDIAN,

Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

>   };
>   
>   void empty_slot_init(hwaddr addr, uint64_t slot_size)
>