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Subject: Re: Fatal trap 12: page fault on Acer Chromebook 720 (peppy)
From: Michael Gmelin <freebsd@grem.de>
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Date: Tue, 21 Aug 2018 00:14:35 +0200
Cc: John Baldwin <jhb@FreeBSD.org>,
 "freebsd-current@freebsd.org" <freebsd-current@freebsd.org>,
 Matthias Apitz <guru@unixarea.de>
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To: Konstantin Belousov <kostikbel@gmail.com>
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> On 20. Aug 2018, at 17:09, Konstantin Belousov <kostikbel@gmail.com> wrote=
:
>=20
>> On Mon, Aug 20, 2018 at 12:45:12AM +0200, Michael Gmelin wrote:
>>=20
>> See here for a screenshot (also including the output of "show pte
>> 0xfffff80001000000"):
>>=20
>> https://gist.github.com/grembo/78d0f2a100dd4f16775b85a118769658#file-ddb1=
-png
> It is too early for ddb routines to register.
> Ok can you try the following debugging patch, to verify my guess ?
>=20
> diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c
> index 18777d23f09..cd05fdb763f 100644
> --- a/sys/amd64/amd64/pmap.c
> +++ b/sys/amd64/amd64/pmap.c
> @@ -1052,8 +1052,7 @@ create_pagetables(vm_paddr_t *firstaddr)
>        pd_p =3D (pd_entry_t *)DMPDkernphys;
>        for (i =3D 0; i < (NPDEPG * nkdmpde); i++)
>            pd_p[i] =3D (i << PDRSHIFT) | X86_PG_V | PG_PS | pg_g |
> -                X86_PG_M | X86_PG_A | pg_nx |
> -                bootaddr_rwx(i << PDRSHIFT);
> +                X86_PG_M | X86_PG_A | pg_nx | X86_PG_RW;
>        for (i =3D 0; i < nkdmpde; i++)
>            pdp_p[i] =3D (DMPDkernphys + ptoa(i)) | X86_PG_RW |
>                X86_PG_V;

With this change it boots okay (mptramp_pagetables is 0x1000000, as expected=
).

Best,
Michael