Re: [PATCH 4/21] i386 Broken bios common

[Ingo Molnar]

* Zachary Amsden <zach@xxxxxxxxxx> wrote:

>  	gdt = get_cpu_gdt_table(cpu);
>  	save_desc_40 = gdt[0x40 / 8];
> -	gdt[0x40 / 8] = bad_bios_desc;
> +	gdt[0x40 / 8] = gdt[GDT_ENTRY_BAD_BIOS_CACHE];
>  

i like the cleanup, but wouldnt it be simpler to dedicate GDT entry #8 
to the 0x40 descriptor, and hence be compatible with such broken BIOSes 
by default? Right now entry #8 is taken up by TLS segment #2, but we 
could change GDT_ENTRY_TLS_MIN from 6 to 9 and push the TLS segments to 
entries 9,10,11. [ Could there be any buggy SMM code that relies on 
having something at 0x40? ]

	Ingo
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