[OpenBIOS] [RFC] Free DVMA area : Available memory on PowerPC and Sparc64

[Olivier Danet]

I don't have the cross-compilers at hand for building the PPC and Sparc64 versions of OpenBIOS,
and test the preceding patch for DVMA, but here are instead the memory properties of an iBook
G3 and a Sun Ultra10 :



-----------------------------------------------

iBook PowerPC :

/memory
	available
		00003000	07bfd000

/cpus/PowerPC,750
	available
		00003000	7fffd000
		d0000000	20000000


-------------------------
OpenBIOS PPC :

/cpus/PowerPC,750 at 0
	available
                 00004000   07c54000
                 07e10000   f80f0000
                 00000000   ffffffff

/memory
	available
                 00004000   07c54000
                 07e10000   000f0000

The "available 00000000 ffffffff" line above looks odd.


It may confuse an OS willing to use these properties.

-----------------------------------------------



Sun Ultra 10 :

/virtual-memory
	available
		fffff800 00000000  000007fc 00000000
		00000001 00000000  000007ff 00000000
		00000000 ffff0000  00000000 0000e000
		00000000 00000000  00000000 f0000000
		00000000 fff86000  00000000 00004000
		00000000 fff76000  00000000 00004000
		00000000 fff00000  00000000 00070000
		00000000 f0800000  00000000 0d800000
/memory
	available

		00000000 07f00000  00000000 0000e000
		00000000 07c02000  00000000 002fc000
		00000000 07002000  00000000 00bfe000
		00000000 00000000  00000000 07000000

-------------------------
OpenBIOS Sparc64 :

/memory
	available
                 00000000 00000000   00000000 07e80000

/virtual-memory
	available
                 00000000 00000000   00000000 ffc80000
                 00000000 fff00000   ffffffff 000fffff

Here, the "ffffffff 000ffffff" looks like an off-by-one error.


-----------------------------------------------

(photos : http://temlib.org/pub/mem_ibook.jpg, http://temlib.org/pub/mem_ultra.jpg)