Re: [PATCH] New phys_addr() syscall
Alexander Kjeldaas (astor@guardian.no)
Sun, 19 Jul 1998 14:24:15 +0200
On Sun, Jul 19, 1998 at 03:53:24PM +1000, Richard.Gooch@atnf.csiro.au wrote:
> Hi, all. I've implemented a simple new system call called
> phys_addr() which converts a virtual address to a physical
> address. This is useful for memory testing programmes so you can find
> out which SIMM/DIMM is causing trouble (yeah, I've got intermittent
> memory problems in one of my machines, and I want to nail the bugger).
> Sure, I know about memtest86, but it doesn't seem to find the problem,
> whereas my userspace tester does.
>
> People writing pure userspace network drivers may also find this handy
> if they want to DMA directly into userspace.
>
> I've only bothered with ix86 syscalls for now. Comments welcome. Patch
> against 2.1.109 below.
>
I this is only useful for specialized utilities, I suggest you check
for capable(CAP_SYS_ADMIN) in the system call.
astor
--
Alexander Kjeldaas, Guardian Networks AS, Trondheim, Norway
http://www.guardian.no/
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