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

[Blue Swirl]

On 2/28/09, Alexander Graf <address@hidden> wrote:
>
>  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".

Sorry, I was confused: 970 != 750.

>  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?

Single binary for both if possible.