linux-kernel - Re: [PATCH 2/9] x86: introduce a set of platform feature flags

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Date:	Tue, 30 Jun 2009 08:32:30 +0200
From:	Pavel Machek <pavel@....cz>
To:	"Pan, Jacob jun" <jacob.jun.pan@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...ux.intel.com>
Subject: Re: [PATCH 2/9] x86: introduce a set of platform feature flags


> +#define X86_PLATFORM_FEATURE_FLOPPY		(0*32+5) /* ISA floppy */
> +#define X86_PLATFORM_FEATURE_ISA		(0*32+6) /* ISA/LPC bus */
> +#define X86_PLATFORM_FEATURE_BIOS		(0*32+7) /* BIOS service,
> +							   *  e.g. int calls
> +							   *  EBDA, etc.
> +							   */
> +#define X86_PLATFORM_FEATURE_ACPI		(0*32+8) /* has ACPI support */
> +#define X86_PLATFORM_FEATURE_SFI		(0*32+9) /* has SFI support */
> +#define X86_PLATFORM_FEATURE_8042		(0*32+10) /* i8042 KBC */
> +
> +extern __u32 platform_feature[N_PLATFORM_CAPINTS];
> +extern const char *const
> +	x86_platform_available_feature[N_PLATFORM_CAPINTS * 32];
> +#define platform_has(bit) \
> +	test_bit(bit, (unsigned long *)platform_feature)

test_bit and friends imply synchronization you probably  don't want or
need...

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