linux-kernel - Re: [PATCH] x86/pci: make pci_mem

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <49EA7111.7040907@zytor.com>
Date:	Sat, 18 Apr 2009 17:32:17 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Yinghai Lu <yinghai@...nel.org>, Ingo Molnar <mingo@...e.hu>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-pci@...r.kernel.org, yannick.roehlly@...e.fr
Subject: Re: [PATCH] x86/pci: make pci_mem_start to be aligned only -v4

Linus Torvalds wrote:
>>
>> 00000100-000973ff : System RAM
>> 00097400-0009ffff : reserved
>> 000a0000-000bffff : PCI Bus #00
>> 000c0000-000cffff : pnp 00:0c
>> 000e0000-000fffff : pnp 00:0c
>> 00100000-b7f9ffff : System RAM
>>   00200000-00c68f6b : Kernel code
>>   00c68f6c-01332f7f : Kernel data
>>   015a6000-01fcaa57 : Kernel bss
>>   20000000-23ffffff : GART
>> b7fa0000-b7fadfff : RAM buffer
>> b7fae000-b7faffff : System RAM
>> b7fb0000-b7fbdfff : ACPI Tables
>> b7fbe000-b7feffff : ACPI Non-volatile Storage
>> b7ff0000-b7ffffff : reserved
> 
> Hmm. That looks correct to me. We filled in that odd area between 
> b7fa0000-b7fadfff that went unmentioned in the e820 tables.
> 
> And that _is_ a really odd hole. I wonder what it is all about. But the 
> approach does seem to have done the right thing.
> 

Looks to me as through the BIOS rounded the end of available memory to a
64K boundary after subtracting the ACPI storage.  That might have been
done to work around an OS loader bug somewhere.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/