Re: [RFC][PATCH] new timeofday core subsystem (v. A3)

[Russell King]

On Tue, Mar 15, 2005 at 10:23:54AM -0500, Albert Cahalan wrote:
> On Mon, 2005-03-14 at 19:22 -0800, Christoph Lameter wrote:
> > On Mon, 14 Mar 2005, Albert Cahalan wrote:
> > 
> > > When the vsyscall page is created, copy the one needed function
> > > into it. The kernel is already self-modifying in many places; this
> > > is nothing new.
> > 
> > AFAIK this will only works on ia32 and x86_64 and not definitely not
> > on ia64. Who knows about the other platforms ....
> 
> I'll bet it does work fine on IA-64. If it didn't, you would
> be unable to load the kernel or load an executable.
> 
> I know it works for PowerPC. You'll need an isync instruction
> of course. You may also want a sync instruction and some code
> to invalidate the cache.
> 
> Setting up the page content should be a 1-time operation done
> at boot. Check your processor manuals as needed.

Won't work on ARM.  We have XIP kernels, which prevents the use of
self-modifying code.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 Serial core
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