Date: Tue, 2 Oct 2001 12:29:14 -0500 (CDT) From: Mike Silbersack <silby@silby.com> To: Dan Nelson <dnelson@allantgroup.com> Cc: <freebsd-arch@FreeBSD.ORG> Subject: Re: Reading physical memory in a cross-platform way Message-ID: <20011002122651.P16126-200000@achilles.silby.com> In-Reply-To: <20011001224604.A29573@dan.emsphone.com>
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On Mon, 1 Oct 2001, Dan Nelson wrote:
> > physmem != hw.physmem. The sysctl is actually the output of a function,
> > not a simple int or the like.
>
> Yeah, but look at the function (i386 as an example):
>
> static int
> sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
> {
> int error = sysctl_handle_int(oidp, 0, ctob(physmem), req);
> return (error);
> }
>
> So the physmem value is just in pages; even though the different
> platforms use ctob() or <mach>_ptob(), the macros all expand to
> ((x) << PAGE_SHIFT).
True, but I still don't want to spread MD-ish code across the kernel. So,
I whipped up the patch I proposed. This introduces "maxmembytes", which
contains the size of ram in bytes. I think I've updated all architectures
properly, but I've only tested on i386. Could someone working on
alpha/ia64/sparc check to make sure that it doesn't break compilation?
Unless there are objections, I'll probably commit it in a few days.
Thanks,
Mike "Silby" Silbersack
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