linux-kernel - Re: [PATCH 3/10 -tip] x86: Add cpufeatures for Advanced Power Management

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Date:	Wed, 20 May 2009 12:45:35 +0530
From:	Jaswinder Singh Rajput <jaswinder@...nel.org>
To:	"H. Peter Anvin" <hpa@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	Robert Richter <robert.richter@....com>,
	Dave Jones <davej@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	x86 maintainers <x86@...nel.org>
Subject: Re: [PATCH 3/10 -tip] x86: Add cpufeatures for Advanced Power
 Management

On Tue, 2009-05-19 at 09:41 -0700, H. Peter Anvin wrote:
> Jaswinder Singh Rajput wrote:
> > 
> > Peter, Ingo:
> > Do you think we need to arrange x86_capability in some order, currently
> > we are using x86_capability numbering in random order.
> > 
> 
> No.
> 

I think better I will show with the coding to get the clear picture.

Currently we are using hardcoded x86_capability as [0], [2], [4], [5].

Thomas prefer to use constant so may be we can define current system as:

enum {
	CPUID_0000_0001_EDX = 0,	/* 0x00000001 edx */
	CPUID_8000_0001_EDX,		/* 0x80000001 edx */
	CPUID_8086_0001_EDX,		/* 0x80860001 edx */
	CPUID_SOFT_MISC1,		/* Software Misc1 */
	CPUID_0000_0001_ECX,		/* 0x00000001 ecx */
	CPUID_C000_0001_EDX,		/* 0xC0000001 edx */
	CPUID_8000_0001_ECX,		/* 0x80000001 ecx */
	CPUID_SOFT_MISC2,		/* Software Misc2 */
	CPUID_SOFT_VIRTUAL,		/* Software Virtualization */
};

I was suggesting to also sort it out based on address and register like this:

enum {
	/* Hardware CPUIDs */
	CPUID_0000_0001_ECX = 0,	/* 0x00000001 ecx */
	CPUID_0000_0001_EDX,		/* 0x00000001 edx */
	CPUID_8000_0001_ECX,		/* 0x80000001 ecx */
	CPUID_8000_0001_EDX,		/* 0x80000001 edx */
	CPUID_8086_0001_EDX,		/* 0x80860001 edx */
	CPUID_C000_0001_EDX,		/* 0xC0000001 edx */

	/* Software/Miscellaneous CPUIDs */
	CPUID_SOFT_MISC1,		/* Software Misc1 */
	CPUID_SOFT_MISC2,		/* Software Misc2 */
	CPUID_SOFT_VIRTUAL,		/* Software Virtualization */
};

Do you have some better suggestion.

Thanks,

--
JSR

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