Kumar Gala writes: > In a discussion with Hollis over beer he raised the question why > TASK_SIZE is 0x80000000 on ppc32. > > I was wondering if anyone know why this was still the case? Seems > like we have a 1Gb whole between TASK_SIZE & KERNELBASE.
Two reasons: (a) PReP used to map PCI stuff with BATs in the 0x80000000 - 0xbfffffff region, and (b) some embedded ports with software-loaded TLBs test just the high bit of the address to determine whether to use the kernel or user page tables. Paul. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev
