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| author | mstsirkin <mstsirkin@0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652> | 2014-03-05 14:16:47 +0000 |
|---|---|---|
| committer | mstsirkin <mstsirkin@0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652> | 2014-03-05 14:16:47 +0000 |
| commit | 0a10ee72e63bbfe358c47c9bccc11d4d10ad49f1 (patch) | |
| tree | 2b4fe51a76babca9d28d6fa1cf16a981b6a6d34f | |
| parent | 77cb18f8f2763e28d9a40abcc677c36b9d213050 (diff) | |
legacy devices: get rid of MUST assume
as Rusty points out MUST assume is not very good requirement.
clarify it.
git-svn-id: https://tools.oasis-open.org/version-control/svn/virtio@312 0c8fb4dd-22a2-4bb5-bc14-6c75a5f43652
| -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 |