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Re: [Xen-devel] SMBIOS starts at 0xe9000 (out of range)

  • To: Guy Zana <guy@xxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
  • Date: Tue, 13 Nov 2007 16:27:03 +0000
  • Delivery-date: Tue, 13 Nov 2007 08:27:56 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: AcgmCEj4SVwEbkIUR9iro4itpNXRaQAAtDe4AACw6CAAAQobSA==
  • Thread-topic: [Xen-devel] SMBIOS starts at 0xe9000 (out of range)

Nope, a straw poll of three boxes shows one of my boxes with tables in the range 0xe0000-0xf0000, and one with the tables in high memory just below 4GB! It’s only the header that has to be in the range 0xf0000-0xfffff.

 -- Keir

On 13/11/07 16:11, "Guy Zana" <guy@xxxxxxxxxxxx> wrote:

Yes, I see it, robios copies just the entry point (but not the structures).
I think the tables should be copied to >0xf0000 as well.

I encountered an implementation which maps 0xf0000 (and nothing below that...)


From: Keir Fraser  [mailto:Keir.Fraser@xxxxxxxxxxxx]
Sent: Tuesday, November 13, 2007  5:38 PM
To: Guy Zana;  xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-devel] SMBIOS starts  at 0xe9000 (out of range)

I’ll have to double check, but I think that rombios  picks up the smbios tables from 0xe9000 and copies them into the valid range.  We do it that way because only rombios knows the memory layout  0xf0000-0xfffff.

 -- Keir

On 13/11/07 15:23, "Guy Zana"  <guy@xxxxxxxxxxxx> wrote:

#define  SMBIOS_PHYSICAL_ADDRESS        0x000E9000

By the spec it  should be somewhere between 0xF0000 to 1MB,
There is even a comment in  the code:

/* SMBIOS entry point -- must be written to a 16-bit aligned  address
   between 0xf0000 and 0xfffff.  
struct smbios_entry_point {

Any reason for  that?



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