On Fri, Oct 14, 2016 at 10:33:15AM -0700, Ravi Pokala wrote:
| -----Original Message-----
| > From: <owner-src-committ...@freebsd.org> on behalf of Doug Ambrisko 
<ambri...@ambrisko.com>
| > Date: 2016-10-14, Friday at 10:27
| > To: Warner Losh <i...@bsdimp.com>
| > Cc: Doug Ambrisko <ambri...@freebsd.org>, src-committers 
<src-committ...@freebsd.org>, "svn-src-all@freebsd.org" 
<svn-src-all@freebsd.org>, "svn-src-h...@freebsd.org" <svn-src-h...@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.

Thanks,

Doug A.
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