Re: [Qemu-devel] [PATCH] Enable support for PPC64 on qemu target v2

[Alexander Graf]

On 27.02.2009, at 22:47, Blue Swirl wrote:

> On 2/27/09, Alexander Graf <address@hidden> wrote:
> > This patch enables OpenBIOS to initialize on PPC64, enabling  
> > support for
> > -cpu 970fx.
> > It gets up to the boot prompt and works rather good so far, though  
> > I haven't
> > been able to run a kernel yet.
>
> It looks like there is a bug in Qemu (testing boot from Debian 4.0R5  
> CD):
>
> invalid/unsupported opcode: 1e - 12 - 1b (782106e4) 00000000014080e4 1
> IN:
> 0x00000000014080d0:  mr      r31,r3
> 0x00000000014080d4:  mr      r30,r4
> 0x00000000014080d8:  mr      r29,r5
> 0x00000000014080dc:  mr      r28,r6
> 0x00000000014080e0:  mr      r27,r7
> 0x00000000014080e4:  rldicr  r1,r1,0,59
>
> But rldicr should be supported on a 750, according to "IBM PowerPC 740
> / PowerPC 750 RISC Microprocessor User’s Manual".

Please keep in mind that booting a PPC64 kernel doesn't work for me  
yet. I'm currently stuck with the DSI handler clobbering the high 32  
bits in the 64 bit GPRs.

I'll try to write up a patch that provides custom register save/ 
restore code for ppc64. Are there any preferences on that?

Would it be better to build a specific PPC64 binary or to detect which  
code to take in runtime and patch it accordingly?

Alex