Re: [linuxsh-shmedia-dev] Status?

[Stuart M. <stu...@st...>]

On Wed, 30 Oct 2002 10:42:28 +0100 lar...@no... wrote:

> Stuart Menefy <stu...@st...> writes:
> > > Are both 32-bit and 64-bit virtual address spaces available to
> > > user mode programs?
> > the current kernel implementation can be more efficient by only
> > managing 32 bit addressing.
> 
> But 64-bit arithmetic is supported (i.e. Linux saves all 64 bits of
> the registers), right?

Yes. All general purpose registers are 64 bit, and native 64 bit
operations are all supported.

However C language pointers are 32 bit, and registers which can only
ever hold addresses (for example the program counter and registers
related to the TLB) only have 32 bits implemented.

Stuart