Proposed changes to io.h

Eugene Surovegin ebs at
Thu Apr 1 02:44:23 EST 2004

On Wed, Mar 31, 2004 at 10:44:25AM -0500, John Whitney wrote:
> 2. I'd like to add 64-bit __raw_readll and __raw_writell routines to
> io.h, done using floating-point registers.  Currently, modules such as
> MTD (when writing to 64-bit buses) perform two 32-bit, non-atomic
> writes, which can cause problems.  Using a floating-point register to
> guarantee a 64-bit write is ugly, but it works.  Code for these inlined
> routines is as follows:


I wonder will it work on 4xx CPUs which don't have floating point unit?


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