[POWERPC] Switch endian of common dev information

[leonardo.bianconi_eldorado.org.br]

Summary

Virtio modern has the common data organized in little endian.
POWERPC architecture, as BE, was reading and writing in the wrong
format.

[leonardo.bianconi_eldorado.org.br]

[POWERPC] Switch endian of common dev information

Virtio modern has the common data organized in little endian.
POWERPC architecture, as BE, was reading and writing in the wrong
format.

Checking endian when reading and writing in dev common.

[bryanv]

sys/dev/virtio/pci/virtio_pci_modern.c

149

This method signature of void pointer and size is too easy to get wrong, difficult to read, and really only makes sense as a DEVMETHOD to avoid interface explosion. Add methods for each size like already exists instead.

[leonardo.bianconi_eldorado.org.br]

Avoid creating new function and convert endian in existing functions.

[leonardo.bianconi_eldorado.org.br]

sys/dev/virtio/pci/virtio_pci_modern.c

149

I've added the call to convert endian inside existing functions, avoiding the new one created before.

[leonardo.bianconi_eldorado.org.br]

sys/dev/virtio/pci/virtio_pci_modern.c

149

@bryanv I have added the endian change inside the existent functions, to be generic, since I didn't identify any call to these functions outside this file.
If you prefer to create specific functions for these calls, I can change it, let me know.
Thanks!

[alfredo]

Thanks Leonardo. I've being testing this patch, it looks good to me.

@bryanv, are you ok with this change?