linux-kernel - Re: [X86] Move the AMD64 specific parts out of setup

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Message-ID: <20080523131636.GH9245@ucw.cz>
Date:	Fri, 23 May 2008 15:16:36 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Dave Jones <davej@...hat.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>, hpa@...or.com
Subject: Re: [X86] Move the AMD64 specific parts out of setup_64.c

Hi!

> Create a separate amd_64.c file in the cpu/ dir for
> the useful parts to live in.
> 

> +#define ENABLE_C1E_MASK		0x18000000
> +#define CPUID_PROCESSOR_SIGNATURE	1
> +#define CPUID_XFAM		0x0ff00000
> +#define CPUID_XFAM_K8		0x00000000
> +#define CPUID_XFAM_10H		0x00100000
> +#define CPUID_XFAM_11H		0x00200000
> +#define CPUID_XMOD		0x000f0000
> +#define CPUID_XMOD_REV_F	0x00040000
> +
> +/* AMD systems with C1E don't have a working lAPIC timer. Check for that. */
> +static __cpuinit int amd_apic_timer_broken(void)
> +{
> +	u32 lo, hi, eax = cpuid_eax(CPUID_PROCESSOR_SIGNATURE);
> +
> +	switch (eax & CPUID_XFAM) {
> +	case CPUID_XFAM_K8:
> +		if ((eax & CPUID_XMOD) < CPUID_XMOD_REV_F)
> +			break;
> +	case CPUID_XFAM_10H:
> +	case CPUID_XFAM_11H:
> +		rdmsr(MSR_K8_ENABLE_C1E, lo, hi);
> +		if (lo & ENABLE_C1E_MASK)
> +			return 1;
> +		break;
> +	default:
> +		/* err on the side of caution */
> +		return 1;
> +	}
> +	return 0;
> +}

This needs to be done in 32-bit kernel, too, right?

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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