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RE: [Xen-devel] A question on vmx loader in xen - how and when rombiosis loaded into memory


  • To: "Cui, Dexuan" <dexuan.cui@xxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
  • From: "Hu Jia Yi" <jyhu@xxxxxxxxx>
  • Date: Thu, 28 Feb 2008 15:33:18 +0800
  • Delivery-date: Wed, 27 Feb 2008 23:33:51 -0800
  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>
  • Thread-index: Ach5uZrg+R067P7ZQX+l7RNQ9dvvJAAAUkQAAAg0atA=
  • Thread-topic: [Xen-devel] A question on vmx loader in xen - how and when rombiosis loaded into memory

Thank you.

 

I notice the system then jumps to F000:FFF0 to execute. But because VMX is turned on, switching to real-mode would incur problems?

 

I don’t find any clue to turn on the vm86 mode as Readme in the tools/firmware directory puts.

 

Best regards,

Hu Jia Yi

Ext: 20430

Tel: 65-67510430

 

-----Original Message-----
From: Cui, Dexuan [mailto:dexuan.cui@xxxxxxxxx]
Sent: Thursday, February 28, 2008 11:43 AM
To: Hu Jia Yi; xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-devel] A question on vmx loader in xen - how and when rombiosis loaded into memory

 

> how and when rombios, vgabios and vmxassist have been loaded to the memory from the disk before calling “memcpy”.

 

They are statically compiled into hvmloader in the way of C array and are loaded with hvmloader.

Please step into the directory hvmloader/ and search for "roms.h" in Makefile.

 

-- Dexuan

 

 


From: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Hu Jia Yi
Sent: 2008
228 11:26
To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] A question on vmx loader in xen - how and when rombiosis loaded into memory

A “main” function is defined in Xen-3.1.0-source/tools/firmware/hvmloader/hvmloader.c.

In this main function, rombios, vgabios and vmxassist are copied to specified address,

with following commands

 

memcpy((void *)ROMBIOS_PHYSICAL_ADDRESS, rombios, rombios_sz);

memcpy((void *)ETHERBOOT_PHYSICAL_ADDRESS, etherboot, sizeof(etherboot));

….

 

But after searching the whole directory “firmware”,  I don’t know how and when rombios, vgabios and vmxassist have been loaded to the memory from the disk before calling “memcpy”.

 

Could anybody help me on this?

 

Best regards,

Hu Jia Yi

Ext: 20430

Tel: 65-67510430

 

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