diff options
| -rw-r--r-- | content.tex | 15 |
1 files changed, 11 insertions, 4 deletions
diff --git a/content.tex b/content.tex index 439a972..973a2e7 100644 --- a/content.tex +++ b/content.tex @@ -1451,10 +1451,8 @@ enabled, device specific configuration starts at byte offset 20 in virtio header. ie. once you enable MSI-X on the device, the other fields move. If you turn it off again, they move back! -When using the legacy interface, both transitional -devices and drivers MUST assume that -the device-specific configuration space -immediately follows these general headers: +Any device-specific configuration space immediately follows +these general headers: \begin{tabular}{|l||l|l|} \hline @@ -1466,6 +1464,15 @@ Purpose & Device Specific & \\ \hline \end{tabular} +When accessing the device-specific configuration space +using the legacy interface, transitional +drivers MUST access the device-specific configuration space +at an offset immediately following the general headers. + +When using the legacy interface, transitional +devices MUST present the device-specific configuration space +if any at an offset immediately following the general headers. + Note that only Feature Bits 0 to 31 are accessible through the Legacy Interface. When used through the Legacy Interface, Transitional Devices MUST assume that Feature Bits 32 to 63 |