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Date: Fri, 5 Mar 2004 16:06:16 -0800 (PST)
From: john moser <bluefoxicy@linux.net>
To: linux-kernel@vger.kernel.org
Subject: Kernel-User shared buffer
Reply-To: bluefoxicy@linux.net
Message-Id: <20040306000616.1D51F3953@sitemail.everyone.net>
Sender: linux-kernel-owner@vger.kernel.org
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Hi.

I'm trying to create a shared buffer for realtime communication
between the kernel and a userspace application.  All allocation
is done for the userspace task in the kernel, and the kernel is
to write to the ram from within syscalls made by other
processes.

I don't think remap_page_range will work for this application,
but I am unsure, and I am unsure of its usage besides.

The basic logic is pretty much as follows:

task_t *acl_daemon = tskacld;
acldata *waclque;
waclque = kmalloc(sizeof(acldata), GFP_KERN);
addr = map_to_user(acl_daemon, waclque, sizeof(acldata));
old_aclque->msg  = msg;
old_aclque->next = addr;
old_aclque->eval = ACL_EVAL_EVAL;

pretty much, I want to map system memory to userspace per task,
in the context of the core kernel.  This is NOT a driver or
loadable module.

If you could give me a source file and function name of a
function that does this or does something similar, I could
work from there.  I've already tried making do_mmap() call a
do_mmap_task() (which is the original do_mmap() with "current"
replaced with "tsk", and tsk passed), but I don't think this
helps me :/

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