Date: Wed, 10 Jul 2019 14:07:59 -0600 From: Ian Lepore <ian@freebsd.org> To: adr <adr@SDF.ORG> Cc: freebsd-arm@freebsd.org Subject: Re: Flush cpu caches Message-ID: <66030643cf22ba15c796837185854f81d00e0a90.camel@freebsd.org> In-Reply-To: <alpine.NEB.2.21.1907091727150.4147@sdf.lonestar.org> References: <alpine.NEB.2.21.1907091634060.3966@sdf.lonestar.org> <339e38254709b7286ab3b507b615de0ac927ef0b.camel@freebsd.org> <alpine.NEB.2.21.1907091727150.4147@sdf.lonestar.org>
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On Tue, 2019-07-09 at 17:30 +0000, adr wrote:
> On Tue, 9 Jul 2019, Ian Lepore wrote:
>
> > Date: Tue, 09 Jul 2019 11:20:23 -0600
> > From: Ian Lepore <ian@freebsd.org>
> > To: adr <adr@SDF.ORG>, freebsd-arm@freebsd.org
> > Subject: Re: Flush cpu caches
> >
> > On Tue, 2019-07-09 at 16:54 +0000, adr wrote:
> > > First of all, hello everyone.
> > >
> > > I'm completely new to FreeBSD (not to BSD). I need to use
> > > something like arm_sync_icache(2) on OpenBSD and NetBSD.
> > >
> > > I'd find what I think I need in machine/cpufunc.h, but the linker
> > > can't find any function symbol. I suppose I have to pass a lib to
> > > the linker, but no idea which one.
> > >
> > > Some help?
> > >
> > > Thanks in advance,
> > > adr.
> > >
> >
> > Hmmm, we have a prototype for arm_sync_icache() but no library
> > function
> > for it. I'll make a note to look into that asap.
> >
> > Until I figure out how to add it properly, you could implement it
> > locally like this:
> >
> > #include <machine/sysarch.h>
> >
> > void arm_sync_icache(u_int addr, int len)
> > {
> > struct arm_sync_icache_args arg;
> >
> > arg.addr = (uintptr_t)addr;
> > arg.len = (uintptr_t)len;
> >
> > sysarch(ARM_SYNC_ICACHE, &arg);
> > }
> >
> > -- Ian
> >
> >
>
> ARM_SYNC_ICACHE
>
> Thanks a lot, that is all I need.
>
> I'll try to not be a pain in the *.
>
> adr.
For anyone interested, I've posted a review for adding
arm_drain_writebuf() and arm_sync_icache() calls to our libc, to be
compatible with the other *BSD systems...
https://reviews.freebsd.org/D20906
-- Ian
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