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RE: [Qemu-devel] ACPI support

From: Yu, Ke
Subject: RE: [Qemu-devel] ACPI support
Date: Wed, 9 Nov 2005 18:14:09 +0800

To support the ACPI event, qemu should at least have General-Purpose Event 
(GPE) register and SCI interrupt (see ACPI 2.0 spec, ch 5.6).  It may not be as 
simple as calculating checksum and updating acpi.S, so I guess you have to use 
real hardware currently. 

If there are more and more usage models for ACPI in qemu, I guess people will 
consider adding ACPI support in qemu :) 

Best Regards
Yu Ke 

Intel, Open Source Technology Center

From: address@hidden [mailto:address@hidden On Behalf Of Shahar Livne
Sent: 2005年11月9日 15:41
To: address@hidden
Subject: Re: [Qemu-devel] ACPI support


Actually, I don't need the whole ACPI mechanism working.
On the real target, I want to use the power button to initiate a reboot.
Such a thing can be done with something like:
cat /proc/acpi/event | grep specific_event > /dev/null && reboot

In the qemu, I never get to load the relevant kernel modules (like button.ko), 
since the ACPI is disabled due to the mentioned checksum failure.

If it is only some small adaptation of the mentioned patch with checksum 
calculation for RSDT and updating acpi.S than I would gladly do it (do you have 
any hints?). Otherwise - I just give up on this now, and use the real hardware.

Shahar Livne
LivneX - Open Source Development and Services

On 11/8/05, Yu, Ke <address@hidden> wrote:
This is an interesting topic, however, not an easy task :)

The patch is for APIC support, and only contains one ACPI MADT entry, which is 
far from full ACPI support. So you may like to call it an APIC patch rather 
than ACPI patch.

If you want to test power management of embedded system with qemu, IMHO, there 
will be a lot of work to do:
* Implement ACPI hardware in QEMU, which includes
   - General ACPI hardware in chipset 
  -  Specific ACPI hardware in every device
* Add ACPI table in BIOS.

Best Regards
Yu Ke
Intel Opensource Technology Center

From: qemu-devel-bounces+ke.yu= address@hidden [mailto:address@hidden On Behalf 
Of Shahar Livne
Sent: 2005年11月9日 1:40 
To: address@hidden
Subject: [Qemu-devel] ACPI support

Hi there,

I use qemu for development of embedded systems. Lately I had a need to check 
ACPI related kernel module, but I have seen that there isn't any support in the 
version 0.7.1 that I use.
I have checked also 0.7.2 and found no support.
A patch that I have found on www.h7.dion.ne.jp/~qemu-win/ for x86_64 by 
F.Navara seemed like close enough.
I have applied it (after adaptation, since it didn't go smooth for 0.7.1 or 

The system booted, but running dmesg | grep ACPI inside the embedded system on 
the qemu gave:

ACPI: RSDP (v000 QEMU ) @ 0x000e0000
ACPI: Invalid RSDT checksum
ACPI: Subsystem revision 20050211
ACPI: Interpreter disabled.

I use the i386 emulation, and the kernel running inside is 2.6.11

Has someone any experience with ACPI in qemu? 


Shahar Livne
LivneX - Open Source Development and Services

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