[OpenBIOS] QEMU OpenBIOS booting?
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
> 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
BootX should use openBIOS functions to allocate memory (as Yaboot
> 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).
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