diff options
| -rw-r--r-- | content.tex | 18 |
1 files changed, 9 insertions, 9 deletions
diff --git a/content.tex b/content.tex index 2cc4ae1..17ba3b8 100644 --- a/content.tex +++ b/content.tex @@ -2218,7 +2218,7 @@ nor behaviour: \endlastfoot \mmioreg{MagicValue}{Magic value}{0x000}{R}{} \hline - \mmioreg{Version}{Device version number}{0x004}{R}{Legacy device MUST return value 0x1.} + \mmioreg{Version}{Device version number}{0x004}{R}{Legacy device returns value 0x1.} \hline \mmioreg{DeviceID}{Virtio Subsystem Device ID}{0x008}{R}{} \hline @@ -2233,9 +2233,9 @@ nor behaviour: \mmioreg{GuestFeaturesSel}{Activated (guest) features word selection}{0x024}{W}{} \hline \mmioreg{GuestPageSize}{Guest page size}{0x028}{W}{% - The driver MUST write the guest page size in bytes to the + The driver writes the guest page size in bytes to the register during initialization, before any queues are used. - This value MUST be a power of 2 and is used by the device to + This value should be a power of 2 and is used by the device to calculate the Guest address of the first queue page (see QueuePFN). } @@ -2266,7 +2266,7 @@ nor behaviour: \hline \mmioreg{QueueAlign}{Used Ring alignment in the virtual queue}{0x03c}{W}{% Writing to this register notifies the device about alignment - boundary of the Used Ring in bytes. This value MUST be a power + boundary of the Used Ring in bytes. This value should be a power of 2 and applies to the queue selected by writing to \field{QueueSel}. } \hline @@ -2276,7 +2276,7 @@ nor behaviour: is the index number of a page starting with the queue Descriptor Table. Value zero (0x0) means physical address zero (0x00000000) and is illegal. When the driver stops using the - queue it MUST write zero (0x0) to this register. + queue it writes zero (0x0) to this register. Reading from this register returns the currently used page number of the queue, therefore a value other than zero (0x0) means that the queue is in use. @@ -2295,8 +2295,8 @@ nor behaviour: flags. Writing non-zero values to this register sets the status flags, indicating the OS/driver progress. Writing zero (0x0) to this - register triggers a device reset. The device MUST - set \field{QueuePFN} to zero (0x0) for all queues in the device. + register triggers a device reset. The device + sets \field{QueuePFN} to zero (0x0) for all queues in the device. Also see \ref{sec:General Initialization And Device Operation / Device Initialization}~\nameref{sec:General Initialization And Device Operation / Device Initialization}. } \hline @@ -2305,7 +2305,7 @@ nor behaviour: \end{longtable} The virtual queue page size is defined by writing to \field{GuestPageSize}, -as written by the guest. The driver MUST do this before the +as written by the guest. The driver does this before the virtual queues are configured. The virtual queue layout follows @@ -2326,7 +2326,7 @@ The virtual queue is configured as follows: \item Allocate and zero the queue pages in contiguous virtual memory, aligning the Used Ring to an optimal boundary (usually - page size). The driver MUST choose a queue size smaller than or + page size). The driver should choose a queue size smaller than or equal to \field{QueueNumMax}. \item Notify the device about the queue size by writing the size to |