On 16/04/2021 01:59, Ethin Probst wrote:
Also, I'm a bit confused. I've looked at several VirtIO devices now
and have seen things like this:
#define VIRTIO_PCI_DEVICE_SIGNATURE SIGNATURE_32 ('V', 'P', 'C', 'I')
// ...
UINT32 Signature;
I'm quite confused because I can't seem to find this anywhere in the
VirtIO specification. The spec says nothing about signature values
anywhere, just the magic value of 0x74726976. So where does this come
from?
From a quick look at the code, it seems to be a private signature value
applied to a software-only data structure used by the UEFI driver, and
is used solely for sanity checking that a pointer is pointing to the
right kind of object.
Michael
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