linux-kernel - access efi variables

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Message-ID: <52333139.6020203@broadcom.com>
Date:	Fri, 13 Sep 2013 17:37:29 +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: access efi variables

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. 
Should I expect trouble :-p

Regards,
Arend

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