linux-kernel - Re: [PATCH 20/20] x86_64: Move CPU verification code to common file

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Date:	Sat, 18 Nov 2006 05:21:58 +0000 (UTC)
From:	Oleg Verych <olecom@...wer.upol.cz>
To:	linux-kernel@...r.kernel.org
Cc:	fastboot@...ts.osdl.org
Subject:  Re: [PATCH 20/20] x86_64: Move CPU verification code to common file

Hallo.

On 2006-11-17, Vivek Goyal wrote:
[]
> +no_longmode:
> +	/* This isn't an x86-64 CPU so hang */
> +1:
> +	hlt
> +	jmp     1b
> +
> +#include "../../kernel/verify_cpu.S"
> +

May hang be done optional? There was a discussion about applying
"panic" reboot timeout here. Is it possible to implement somehow?

[]
> diff -puN /dev/null arch/x86_64/kernel/verify_cpu.S
> --- /dev/null	2006-11-17 00:03:10.168280803 -0500
> +++ linux-2.6.19-rc6-reloc-root/arch/x86_64/kernel/verify_cpu.S	2006-11-17 00:14:07.000000000 -0500
> @@ -0,0 +1,106 @@
> +/*
> + *
> + *	verify_cpu.S - Code for cpu long mode and SSE verification
> + *
> + *	Copyright (c) 2006-2007  Vivek Goyal (vgoyal@...ibm.com)
                           ^^^^
Warning: File verify_cpu.S has modification time in the future...
(preliminary shoot (in the head ;))

[]
> +verify_cpu:
> +
> +	pushfl				# Save caller passed flags
> +	pushl	$0			# Kill any dangerous flags
> +	popfl
> +
> +	/* minimum CPUID flags for x86-64 */
> +	/* see http://www.x86-64.org/lists/discuss/msg02971.html */

Maybe there's a place for this in Documentation/ ?

> +#define SSE_MASK ((1<<25)|(1<<26))
> +#define REQUIRED_MASK1 ((1<<0)|(1<<3)|(1<<4)|(1<<5)|(1<<6)|(1<<8)|\
> +					   (1<<13)|(1<<15)|(1<<24))

Maybe there is a more readable way to setup this mask?
____

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