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Re: [Qemu-devel] Regression: more 0.12 regression (SeaBIOS related?)
From: |
Roy Tam |
Subject: |
Re: [Qemu-devel] Regression: more 0.12 regression (SeaBIOS related?) |
Date: |
Wed, 10 Mar 2010 13:24:27 +0800 |
2010/3/10 Kevin O'Connor <address@hidden>:
> On Wed, Mar 10, 2010 at 11:49:48AM +0800, Roy Tam wrote:
>> 2010/3/10 Kevin O'Connor <address@hidden>:
>> > SeaBIOS has a wealth of debugging information that could help solve
>> > these issues.
>>
>> Tried this this BIOS and 2 debug logs generated.
>> seabios-debug.log is booting fdos0138.img and closes QEMU after boots to
>> prompt.
>> seabios-debug-2.log is booting fdos0138.img and type something and
>> Illegal Instruction occurred.
>
> I don't see an "Illegal Instruction" message. Instead, I see the
> keyboard just not working. What qemu version and what command line
> did you use?
latest git today. when you type fast.
>
> I've tracked down why keys are lost on SeaBIOS and not lost on Bochs
> BIOS. The fdos0138.img code is taking over the irq handler for the
> ps2 port hardware irq. When the irq fires, it reads the ps2 port for
> the key data and then calls the bios irq handler assuming it will
> reread the key and process it. However, SeaBIOS reads the ps2 port
> status indicator and finds that there is no data pending (because the
> key was already read by the fdos0138.img irq handler).
>
> Bochs BIOS just reads the data from the ps2 port and assumes it is for
> the keyboard. SeaBIOS verifies the data being read and wont process
> random data from the port.
>
> What the fdos0138.img image is doing is broken - once it reads the key
> from the ps2 port, nothing stops a new key from being read the next
> time something reads from the port. Indeed, although the keyboard
> works in qemu-0.11 for fdos0138.img, if one types fast they'll see
> duplicate and lost keys.
>
But it is how programs(Chinese/Japanese/Korean Display Systems,
GW-BASIC, etc.) in the past get input from keyboard.
"Consider" legacy as "broken" is wrong IMHO.
- Re: [Qemu-devel] Regression: more 0.12 regression (SeaBIOS related?), (continued)
Re: [Qemu-devel] Regression: more 0.12 regression (SeaBIOS related?), Natalia Portillo, 2010/03/09
Re: [Qemu-devel] Regression: more 0.12 regression (SeaBIOS related?), Kevin O'Connor, 2010/03/09
- Re: [Qemu-devel] Regression: more 0.12 regression (SeaBIOS related?), Roy Tam, 2010/03/09
- Re: [Qemu-devel] Regression: more 0.12 regression (SeaBIOS related?),
Roy Tam <=
- Re: [Qemu-devel] Regression: more 0.12 regression (SeaBIOS related?), Kevin O'Connor, 2010/03/10
- Re: [Qemu-devel] Regression: more 0.12 regression (SeaBIOS related?), Roy Tam, 2010/03/11
- Re: [Qemu-devel] Regression: more 0.12 regression (SeaBIOS related?), Natalia Portillo, 2010/03/11
- Re: [Qemu-devel] Regression: more 0.12 regression (SeaBIOS related?), Kevin O'Connor, 2010/03/11
- Re: [Qemu-devel] Regression: more 0.12 regression (SeaBIOS related?), Roy Tam, 2010/03/11
- Re: [Qemu-devel] Regression: more 0.12 regression (SeaBIOS related?), Roy Tam, 2010/03/12
- Re: [Qemu-devel] Regression: more 0.12 regression (SeaBIOS related?), Kevin O'Connor, 2010/03/13
- Re: [Qemu-devel] Regression: more 0.12 regression (SeaBIOS related?), Roy Tam, 2010/03/13
[Qemu-devel] PC keyboard emulation (was: Regression: more 0.12 regression (SeaBIOS related?)), Jamie Lokier, 2010/03/12
[Qemu-devel] Re: PC keyboard emulation (was: Regression: more 0.12 regression (SeaBIOS related?)), Kevin O'Connor, 2010/03/13