Ralf Baechle DL5RB wrote: > > On Sun, Jan 31, 2010 at 08:55:03AM -0800, Guenter Roeck wrote: > >> > The size of the address space can be probed via CP0 registers (for >> MIPS >> > architecture processors that is). No need to add any CPU dependencies >> > (except from legacy 64-bit MIPS processors perhaps). >> > >> That would help. Do you happen to know which CP0 register(s) to look for >> ? >> I browsed through the MIPS 5K and 20Kc manuals, but didn't find it. > > Write a value with all bits set to c0_entryhi, then read it back again. > The set bits in the VPN2 bitfield will indicate the size of the virtual > address range supported. The MIPS64 documentation also calls this value > SEGBITS. The nice thing about this probe is that it is supported for > all 64-bit MIPS processors except the R8000 which has an entirely > different > TLB scheme anyway. > > Similarly it is possible to probe the physical address range in either > c0_entrylo0 or c0_entrylo1. This is also of interest on 32-bit > processors. > > Ralf > > > Ok, I'll try that and submit a new set of patches if it works. Guenter -- View this message in context: http://old.nabble.com/Kernel-crash-in-2.6.32.6---bcm1480-with-16k-page-size-tp27358179p27405624.html Sent from the linux-mips main mailing list archive at Nabble.com.
