Fwd: Creating a "new" virtual address space for a process

---------- Forwarded message ----------
From: Pranav Sawargaonkar <pranav.sawargaonkar@xxxxxxxxx>
Date: Jan 22, 2007 12:27 PM
Subject: Re: Creating a "new" virtual address space for a process
To: Joe Damato <jdamato@xxxxxxxxxxxxxx>



On 1/22/07, Joe Damato <jdamato@xxxxxxxxxxxxxx > wrote:

Hello -

>This is my first time posting to the list, so please let me know if I
>should expand on anything I mention here. I am working on the S4OS
>project for FreeBSD with a couple friends and we are currently trying to
>understand how to use the VM system in FreeBSD.

>We have a process, (in this case it happens to be curproc or proc0), and
>we would like to create a new virtual address space and allocate, say N
>pages starting at address X.

To allocate new vmspace and vm_map you can use vmspace_fork() defined in
vm/vm_map.c.


We have been reading the fork() code to try
>to see how this would work, but got lost in some of the COW stuff.

>We have some kernel data that needs to be copied out to userland, but we
>can't seem to figure out how to actually set up that virtual address
>space. I would attach a code snippet of the code we wrote to accomplish
>this, but it is literally all guess work, and probably completely wrong.
>Anyone know how to do this or even where to look to see an example of
>this happening?

>Thanks,
>Joe
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