linux-kernel - Re: access efi variables

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Message-ID: <52333FBE.2080206@broadcom.com>
Date:	Fri, 13 Sep 2013 18:39:26 +0200
From:	"Arend van Spriel" <arend@...adcom.com>
To:	"Matt Fleming" <matt.fleming@...el.com>
cc:	linux-efi@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: access efi variables

On 09/13/2013 05:37 PM, Arend van Spriel wrote:
> I need to obtain a uefi variable so I went looking at the API in
> include/linux/efi.h. I found the following definition:
>
> /*
>   * The maximum size of VariableName + Data = 1024
>   * Therefore, it's reasonable to save that much
>   * space in each part of the structure,
>   * and we use a page for reading/writing.
>   */
>
> struct efi_variable {
>      efi_char16_t  VariableName[1024/sizeof(efi_char16_t)];
>      efi_guid_t    VendorGuid;
>      unsigned long DataSize;
>      __u8          Data[1024];
>      efi_status_t  Status;
>      __u32         Attributes;
> } __attribute__((packed));
>
> But according to the specs the variable I need to obtain is 2k bytes.

Maybe clarify that "the specs" is basically the feature information I 
received internally here.

> Should I expect trouble :-p
>
> Regards,
> Arend
>
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