[OpenBIOS] QEMU OpenBIOS booting?
Laurent Vivier
Laurent at vivier.eu
Sun Apr 19 22:24:02 CEST 2009
Le dimanche 19 avril 2009 à 13:14 -0700, Steven Noonan a écrit :
> On Sun, Apr 19, 2009 at 1:08 PM, Laurent Vivier <Laurent at lvivier.info> wrote:
> > Le dimanche 19 avril 2009 à 13:00 -0700, Steven Noonan a écrit :
> >> On Sun, Apr 19, 2009 at 12:23 PM, Blue Swirl <blauwirbel at gmail.com> wrote:
> >> > On 4/19/09, Steven Noonan <steven at uplinklabs.net> wrote:
> >> >> On Sun, Apr 19, 2009 at 1:24 AM, Laurent Vivier <Laurent at lvivier.info> wrote:
> >> >> > Le dimanche 19 avril 2009 à 00:50 -0700, Steven Noonan a écrit :
> >> >> >> On Tue, Apr 14, 2009 at 10:46 PM, Steven Noonan <steven at uplinklabs.net> wrote:
> >> >> >> > On Sun, Apr 12, 2009 at 1:39 AM, Laurent Vivier <Laurent at lvivier.info> wrote:
> >> >> >> >> OpenBIOS is not able to boot MacOS X.
> >> >> >> >
> >> [...]
> >> $=:>> XCOFF - load_xcoff: Loading 'System\Library\CoreServices\BootX'
> >> >> XCOFF - load_xcoff: XCOFF file with 3 sections entry:fff0a22c
> >> >> XCOFF - load_xcoff: Read next header (5c)
> >> >> XCOFF - load_xcoff: Load '.text' section from 5c d4 to 5600000 (28000)
> >> >> XCOFF - load_xcoff: Read next header (84)
> >> >> XCOFF - load_xcoff: Load '.data' section from 84 280d4 to 5628000 (2000)
> >> >> XCOFF - load_xcoff: Read next header (ac)
> >> >> XCOFF - load_xcoff: Erase '.bss' section at 562a000 size: 3a000
> >> >> ELF - transfer_control_to_elf: Starting ELF boot loader
> >> invalid/unsupported opcode: 02 - 0e - 0c (0b717b1c) 05616ed8 1
> >> invalid/unsupported opcode: 00 - 14 - 13 (000064e8) 000094d0 0
> >> Alcarin:qemu steven$
> >>
> >>
> >> So at least with my patches, we're getting what people with QEMU 0.8.0
> >> were getting: http://tinyurl.com/qemu080
> >>
> >> So now what's left is resolving -why- that 'invalid/unsupported
> >> opcode' issue crops up.
> >
> > I think the booloader is loaded at addresses overwriting some parts of
> > openbios.
> >
>
> That would make sense, but that tells me QEMU is loading OpenBIOS to
The problem is in OpenBios: I put some structures in memory without
knowing this... but this is not part of openfirmware specification.
> the wrong location. From the book "Mac OS X Internals: A Systems
> Approach":
>
> Table 45. BootX Logical Memory Map
>
> Starting Address Ending Address Purpose
> 0x00000000 0x00003FFF Exception vectors.
> 0x00004000 0x03FFFFFF Kernel image, boot structures, and drivers.
I put there some memory allocation information.
> 0x04000000 0x04FFFFFF File load area.
> 0x05000000 0x053FFFFF Simple read-time cache for file system
> metadata. Cache hits are serviced from memory, whereas cache misses
> result in disk access.
> 0x05400000 0x055FFFFF Malloc zone: a simple memory allocator is
> implemented in BootX's libclite subproject. The starting and ending
> addresses of this range define the block of memory used by the
> allocator.
BootX should use openBIOS functions to allocate memory (as Yaboot
does...)
> 0x05600000 0x057FFFFF BootX image.
This should be "load-base"
> 0x05800000 0x05FFFFFF Unused (occupied by the Open Firmware image).
>
>
> So it should be loading OpenBIOS to address 0x05800000, and the BootX
> image should load to 0x05600000 (the latter does as it should,
> according to the debug output).
For the moment OpenBIOS is loaded at end physical memory and mapped at
end of space address (the reset vector is here).
Regards,
Laurent
More information about the OpenBIOS
mailing list