linux-kernel - Re: [PATCH] x86: efi/e820 table merge fix

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Date:	Wed, 17 Jun 2009 09:10:05 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Cliff Wickman <cpw@....com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>, "hpa@...or.com" <hpa@...or.com>,
	"yinghai@...nel.org" <yinghai@...nel.org>
Subject: Re: [PATCH] x86: efi/e820 table merge fix

On Wed, 2009-06-17 at 05:43 +0800, Cliff Wickman wrote:
> From: Cliff Wickman <cpw@....com>
> --- linux.orig/arch/x86/kernel/efi.c
> +++ linux/arch/x86/kernel/efi.c
> @@ -240,10 +240,35 @@ static void __init do_add_efi_memmap(voi
>  		unsigned long long size = md->num_pages << EFI_PAGE_SHIFT;
>  		int e820_type;
>  
> -		if (md->attribute & EFI_MEMORY_WB)
> -			e820_type = E820_RAM;
> -		else
> +		switch (md->type) {
> +		case EFI_LOADER_CODE:
> +		case EFI_LOADER_DATA:
> +		case EFI_BOOT_SERVICES_CODE:
> +		case EFI_BOOT_SERVICES_DATA:
> +		case EFI_CONVENTIONAL_MEMORY:
> +			if (md->attribute & EFI_MEMORY_WB)
> +				e820_type = E820_RAM;
> +			else
> +				e820_type = E820_RESERVED;
> +			break;

Why does BIOS mark memory region without EFI_MEMORY_WB as these types?
Any example?

Best Regards,
Huang Ying


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