svn commit: r307326 - head/sys/boot/efi/loader

[Warner Losh]

On Oct 14, 2016 11:55 AM, "Doug Ambrisko" <ambrisko at ambrisko.com> wrote:
>
> On Fri, Oct 14, 2016 at 10:33:15AM -0700, Ravi Pokala wrote:
> | -----Original Message-----
> | > From: <owner-src-committers at freebsd.org> on behalf of Doug Ambrisko <
ambrisko at ambrisko.com>
> | > Date: 2016-10-14, Friday at 10:27
> | > To: Warner Losh <imp at bsdimp.com>
> | > Cc: Doug Ambrisko <ambrisko at freebsd.org>, src-committers <
src-committers at freebsd.org>, "svn-src-all at freebsd.org" <
svn-src-all at freebsd.org>, "svn-src-head at freebsd.org" <
svn-src-head at freebsd.org>
> | > Subject: Re: svn commit: r307326 - head/sys/boot/efi/loader
> | >
> | > On Fri, Oct 14, 2016 at 11:16:02AM -0600, Warner Losh wrote:
> | > | Love the functionality, but don't like using the 'hint' namespace
for
> | > | this. Can we change it now before too many things depend on it? We
had
> | > | similar issues in ACPI and moved it to the 'acpi' space. Can we move
> | > | this to the 'smbios' space please?
> | > |
> | > | The reason is that 'hint' is special and sometimes filtered out, so
it
> | > | is a poor choice to export data from the boot loader to the kernel.
> | >
> | > The reason I picked hint was it could be put /boot/device.hints
> | > to make it work as well and that it was a hint.  Other standards in
the
> | > future might use other methods.  Looking back over the email I had
> | > with John he had suggested hint.smbios.0.anchor to make this look
> | > different.  This code had been hanging around for so long I forgot
> | > about that and we were using hint.smbios.0.mem in our shipping code
base.
> | >
> | > However, I hope that nothing would use this except for smbios(4) and
> | > for people to make smbios(4) useful for this info.
> |
> | Doug's looking at me when he says that. :-)
> |
> | We talked about this last night at BAFUG; right now, even if smbios(4)
> | is able to find the SMBIOS info -- it currently only looks at the
> | aforementioned 0xf0000 - 0xfffff range, so it can't find it on UEFI --
> | smbios(4) doesn't actually provide any interface for that information.
> | Doug and I have talked about making smbios(4) useful, by parsing the
> | data and providing KPIs and APIs, for years now; I think I'll *finally*
> | have the time and motivation to do so "soon".
>
> I've actually talked to a few people.  However, your the first to
> step up.  This needs to be designed and will take some time and
> review.  I would hope that except for smbios(4), nothing else would
> use this kenv but there is nothing to prevent that :-(  I could name
> it super_secret_dont_use.
>
> BTW, to get you started this patch prevents smbios(4) from blowing chunks
> when it gets a anchor in high memory and works on legacy machines.
>
> --- /sys/x86/bios/smbios.c      2013-10-01 14:28:25.000000000 -0700
> +++ ./smbios.c  2016-04-11 11:58:03.234969000 -0700
> @@ -38,6 +38,7 @@ __FBSDID("$FreeBSD: release/9.2.0/sys/x8
>  #include <machine/bus.h>
>  #include <machine/resource.h>
>  #include <sys/rman.h>
> +#include <sys/sysctl.h>
>
>  #include <vm/vm.h>
>  #include <vm/vm_param.h>
> @@ -59,7 +60,7 @@ struct smbios_softc {
>  };
>
>  #define        RES2EPS(res)    ((struct smbios_eps
*)rman_get_virtual(res))
> -#define        ADDR2EPS(addr)  ((struct smbios_eps
*)BIOS_PADDRTOVADDR(addr))
> +#define        ADDR2EPS(addr)  ((struct smbios_eps *)PHYS_TO_DMAP(addr))
>
>  static devclass_t      smbios_devclass;
>
> @@ -71,19 +72,26 @@ static int  smbios_modevent (module_t, in
>
>  static int     smbios_cksum    (struct smbios_eps *);
>
> +static unsigned long addr;
> +static SYSCTL_NODE(_hw, OID_AUTO, smbios, CTLFLAG_RD, 0,
> +    "SMBIOS driver parameters");
> +SYSCTL_LONG(_hw_smbios, OID_AUTO, mem, CTLFLAG_RW,
> +        &addr, 0, "");
> +
>  static void
>  smbios_identify (driver_t *driver, device_t parent)
>  {
>         device_t child;
> -       u_int32_t addr;
>         int length;
>         int rid;
>
>         if (!device_is_alive(parent))
>                 return;
>
> -       addr = bios_sigsearch(SMBIOS_START, SMBIOS_SIG, SMBIOS_LEN,
> -                             SMBIOS_STEP, SMBIOS_OFF);
> +       if (resource_long_value("smbios", 0, "mem", &addr) != 0 ||
> +           addr == 0)
> +               addr = bios_sigsearch(SMBIOS_START, SMBIOS_SIG,
SMBIOS_LEN,
> +                                     SMBIOS_STEP, SMBIOS_OFF);
>         if (addr != 0) {
>                 rid = 0;
>                 length = ADDR2EPS(addr)->length;
>
> Note I don't plan to commit this since it doesn't really do much and we
> need a lot more.

I was planning on exporting all smbios stuff via sysctl.

You can still put non hints.* in device.hints too.

I can rework things a bit to be more complete is you like...

Warner