svn commit: r208921 - in head/sys: amd64/amd64 conf i386/i386 x86/x86

[Bruce Evans]

On Tue, 8 Jun 2010, John Baldwin wrote:

> On Tuesday 08 June 2010 2:04:07 pm John Baldwin wrote:
>> Log:
>>   Move the machine check support code to the x86 tree since it is identical
>>   on i386 and amd64.
>>
>>   Requested by:	alc
>
> It would be nice to consolidate <machine/mca.h> as that is identical on both
> platforms, but that moving to x86/include is trickier as the header needs to
> be available in userland, probably as <machine/mca.h> still.  <x86/mca.h>
> would work ok (i.e. in /usr/include/x86/mca.h), but that makes things trickier
> in the kernel as the file should really live in sys/x86/include, not sys/x86
> directly.

Having x86/include would defeat <machine>.  However, <machine> is only
good for MD implentations of MI interfaces (things like PAGE_SIZE and
va_arg()), so mca.h, like many other headers now there, should never
have been in <machine>.  mca.h is very MD and currently only exists
for amd64, i386, ia64 and pc98.  Applications that know that there is
such a file can also know where it is.  It should be somewhere like
<x86> for amd64, i386 and pc98.  This is mainly for userland.  In the
kernel, the natural place for most arch-specific headers is in the
arch/arch subdir, not arch/include where they are now.  That would be
sys/x86/x86 here.  There seems to be no reason for the arch/include
subdir to exist for pseudo-arches like x86.  It would just be a little
easier to export only the headers in it if the headers are separate.

Bruce