Sorry if this bugs anyone, but I'm learning things here.
What I would expect the kernel to do is this:
system_call_data_prep (userdata, size){
if !4G/4G {
for each page from userdata to userdata+size
{
if the page is swapped out, swap it in
if the page is not owned by the user process, return -ENOWAYMAN
otherwise, lock the page
}
return userdata;
}
else { //kernel land and userland are mutually exclusive
copy the data into kernel land
return kernelland_copy_of_userdata;
}
}
(And then the syscall would need to run the opposite function
sys_call_data_unprep to unlock pages.)
Hmm, maybe that interface sucks.
Is it anything close to that?
--
The best is the enemy of the good -- Voltaire
The Good Enough is the enemy of the Great -- Me
http://www.hacksaw.org -- http://www.privatecircus.com -- KB1FVD
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