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From: spam collector <spamcollector@cableone.net>
To: edk2-devel@lists.01.org
Subject: OVMF.fd and placement of EfiBootServicesData
Date: Sun, 2 Oct 2016 23:16:24 -0400 (EDT)	[thread overview]
Message-ID: <1825038664.87486514.1475464584880.JavaMail.zimbra@cableone.net> (raw)
In-Reply-To: <1063482308.87469389.1475464272414.JavaMail.zimbra@cableone.net>

Hello, 
Forgive me for not searching for this first, but gmane.org has 
been down for a little while. Therefore, forgive me if this 
question has been asked and answered. 
I am using OVMF.fd and QEMU for Windows and tried to load 
a large file to physical address 0x00800000. When an error 
was returned, I found that OVMF has reserved an amount of 
EfiBootServicesData within/around that location. 
Here is a memory dump using the BootServices MemoryMap Service: 
Start: 0x00000000->0x0009FFFF, Pgs: 160, EfiConventionalMem 
Start: 0x00100000->0x003FFFFF, Pgs: 768, EfiConventionalMem 
Start: 0x00400000->0x0040BFFF, Pgs: 12, EfiBootServicesCode 
Start: 0x0040C000->0x0081FFFF, Pgs: 1044, EfiConventionalMem 
Start: 0x00820000->0x00FFFFFF, Pgs: 2016, EfiBootServicesData 
Start: 0x01000000->0x0BFFFFFF, Pgs: 1044, EfiConventionalMem 
... and so on 
Without the idea of "you should make your code relocatable, 
i.e.: not care where it is in memory", or if I say that I *must* have 
the memory from 0x00800000 to 0x00FFFFFFavailable, 
without re-building OVMF.fd, is there a way to tell the system 
to use a different address for that portion of EfiBootServiceCode? 
I tried manipulating NvVars with a few entries to no avail. 
I added the "LoadFixedAddressConfigurationTable" entry hoping 
that I could set a minimum location, too without success. 
So, without rebuilding OVMF.fd, which would require everyone 
whom wished to use my code to do so, or at least download it 
from me, and I don't like modified packages of other's work 
floating around, is there a why to tell OVMF.fd/the EFI system 
to not use memory below a certain address? 
Thank you in advance for your suggestions, 
Ben 
-- 



       reply	other threads:[~2016-10-03  3:16 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1063482308.87469389.1475464272414.JavaMail.zimbra@cableone.net>
2016-10-03  3:16 ` spam collector [this message]
2016-10-03  9:42   ` OVMF.fd and placement of EfiBootServicesData Laszlo Ersek
2016-10-04  2:45     ` spam collector
2016-10-04  7:52       ` Laszlo Ersek
2016-10-04 16:39         ` spam collector
2016-10-04 17:22           ` Laszlo Ersek
2016-10-05  2:47             ` spam collector
2016-10-05 15:28               ` Laszlo Ersek
2016-10-06  3:05                 ` spam collector
2016-10-06  7:39                   ` Laszlo Ersek
2016-10-07  3:11                     ` spam collector
2016-10-07 15:08                       ` Laszlo Ersek
2016-10-06  5:45                 ` spam collector
2016-10-06  7:47                   ` Laszlo Ersek

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