Date: Wed, 01 Sep 2004 05:03:09 +0000 From: "Pine Ful" <pineful@hotmail.com> To: freebsd-questions@freebsd.org Subject: Question::page fault::vm:::encrypt and decrypt file data Message-ID: <BAY1-F28gElRFRgNWLW0004001c@hotmail.com>
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hi,
Q1: How to produce a page fault?
Q2: How translate physical memory address into virtual memory address?
Because phys addr is 64 bit and virtual addr is 32 bit.
Q1 description:: I have succeed to add hook in vfs layer to encrypt file
data before write and decrypt file data after read. Now, when I use cp
command, system will reboot, it seem to caused by encrypt data whose addr is
uio->uio_iov->iov_base. Is it ok if only I produce a page fault manually?
Q2 description:: I try to decrypt file data when page fault. I find it's
easy to get physical address from virtual address, but when page fault, kern
will page in several pages including page we require, how can I get virtual
memory address of these pages? May I access data in physical memory
directly? If yes, how tranlate 64 bit phys addr into 32 bit virt addr?
Thanks!!!!
pine
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