Re: APIC, AMD-K6/2 -mcpu=586...

[Bill Pringlemeir <bpringle@sympatico.ca>]

>>>>> "JAM" == J A Magallon <jamagallon@able.es> writes:

 JAM> That is not the problem. The problem is that the registers have
 JAM> to lay in a defined way, transcribed to a C struct, and that
 JAM> pgcc lays badly that struct.

 WJP> Yes, I understand that.  I was showing a way to find the value
 WJP> of padding needed to align the register store in the structure.
 WJP> Perhaps I should have shown a mod to asm/processor.h,
[snip]
 WJP> I was describing a way to make things independent of the
 WJP> compiler layout of the structs.  However, this complicates the
 WJP> build process, and people might not like the padding due to
 WJP> cache alignment details.

Sorry,  they would obviously declare it as such if the kernel developers
wanted to.

        /* floating point info */
        unsigned char fpAlign[0] __attribute__ ((aligned (16)));
	union i387_union	i387;

This is a much simpler way of achieving what I was trying to explain
previously.  I think that this syntax has been in the GCC extensions
for some time.

regards,
Bill Pringlemeir.