Re: How do I access ioports from userspace?

Jes Sorensen
2003-09-26T08:56:53Z

>>>>> "Ben" == Benjamin Herrenschmidt <benh@kernel.crashing.org> writes:

Ben> On Fri, 2003-09-26 at 09:34, Frank v Waveren wrote:
>> in[bwl]/out[bwl] are available on a lot more than just x86. Mind
>> you, the mechanisms are subtly different. Then again, if you're
>> using direct hardware access you're not going for portability
>> anyway.

Ben> Are they from userland ? I doubt it...

Actually yes on some architectures, ia64 emulates it the ia32
API. That said, it's certainly not something one should be encouraged
to do, using MMIO is a far better approach.

Cheers,
Jes