laurent.pinchart at skynet.be
Wed Apr 3 01:49:07 CST 2002
I need to implement the SharedUserData, which is a page of memory
located at (KERNEL_BASE - 0x10000) shared between user space (read-only
access) and kernel space.
Some information in that page are very accurate (system time in 100ns
units for instance), so I don't think that it would be possible to
create a shared page at (KERNEL_BASE - 0x10000) and refresh it fast enough.
Please correct me if I'm wrong, but I think that the way to go would be
to create a copy of that page in memory and initialize it when Wine
starts (some information never change, like the system root or version
number). When a user space program would try to access that page, the
page fault exception handler would return the appropriate data.
I'm not very familiar with Wine internals, so I might be wrong, or
forget some important issues. Comments are more than welcome :-)
I'd also appreciate if someone could give me some hints about the
implementation (where I should look for the page fault exception
handler, where I should initialize that shared data, where I can find
the needed information to initialize those data, ...).
Thanks in advance.
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