diff options
| -rw-r--r-- | content.tex | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/content.tex b/content.tex index c9a566a..c98648b 100644 --- a/content.tex +++ b/content.tex @@ -13,12 +13,16 @@ device consists of the following parts: \end{itemize} \section{\field{Device Status} Field}\label{sec:Basic Facilities of a Virtio Device / Device Status Field} +During device initialization by a driver, +the driver follows the sequence of steps specified in +\ref{sec:General Initialization And Device Operation / Device +Initialization}. The \field{device status} field provides a simple low-level -diagnostic: it's most useful to imagine them hooked up to traffic +indication of the completed steps of this sequence. +It's most useful to imagine it hooked up to traffic lights on the console indicating the status of each device. The following bits are defined: - \begin{description} \item[ACKNOWLEDGE (1)] Indicates that the guest OS has found the device and recognized it as a valid virtio device. @@ -41,8 +45,12 @@ following bits are defined: \end{description} \drivernormative{\subsection}{Device Status Field}{Basic Facilities of a Virtio Device / Device Status Field} -The driver MUST update \field{device status} in the order above to -indicate the driver's progress. The driver MUST NOT clear a +The driver MUST update \field{device status}, +setting bits to indicate the completed steps of the driver +initialization sequence specified in +\ref{sec:General Initialization And Device Operation / Device +Initialization}. +The driver MUST NOT clear a \field{device status} bit. If the driver sets the FAILED bit, it MUST reset the device before attempting to re-initialize. |