ubuntu-mips team mailing list archive

[Siggy Brentrup <ubuntu@xxxxxxxxxxxxxx>]

On Mon, Aug 03, 2009 at 17:45 +0800, LIU Qi wrote:

> Currently the Linux kernel for Loongson is already 64-bit capability.

Not only for Loongson, current kernels report mips64 even on a 32bit
Indy, even ancient r4k mipsen seem to support 64 bit.

Please bear with me trying to understand terms you are throwing
around, as of this writing I didn't find precise definitions for o32,
n32 and n64.  This neat little table sums up what I deduced from
context.

    +-----+----------------------+--------------------+
    |     | Kernel address space | Userland           |
    +-----+----------------------+--------------------+
    | o32 | 32 bit       (< 4GB) | 32 bit     (< 3GB) |
    +-----+----------------------+--------------------+
    | n32 | 64 bit   (unlimited) | 32 bit     (< 3GB) |
    +-----+----------------------+--------------------+
    | n64 | 64 bit   (unlimited) | 64 bit (unlimited) |
    +-----+----------------------+--------------------+

Figures in parentheses mean amount of usable memory, virtual for
userland, physical for kernel space.  unlimited means in pratice,
mathematically correct: 2^64 B.

Please correct me if I got anything wrong.

Thanks
  Siggy
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