vkernel working

Mehul Chadha mehulc87 at gmail.com
Sun Feb 1 04:09:55 PST 2009

hello all,
                I am a newbie in the field of kernel. I have been
trying to understand the working of vkernel reading into the source
code and the documents, but i have not been able to understand certain

1) My first doubt is that when we create a virtual RAM by mmaping a
file which is not synced back to the disk, is the kernel ie the
vkernel inside the virual RAM or is it only in a different address
space given to it by the linker??? I mean is the code and data of
vkernel copied into the virtual RAM and then executed from there?? If
yes which function does tht job??

2) secondly i have not been able to understand the complex paging part
of vkernel, by giving the mapping as MAPTYPE_VPAGETABLE how does real
kernel map the vkernel page directory and table to itself, does it
change the CR3 register to page directory given by vkernel when its
scheduling the vkernel or any of vkernel's processes??? pls if anyone
can explain me how paging is handled in vkernel?? I have read the
document titled 'A Peek at the DragonFly Virtual Kernel' I have
understood the process management part but having problems
understanding the MM part ie paging...

pls if anyone can help me in clearing the above doubts , i have been
trying for many days but still havnt got the hook of it...


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