linux-kernel - Re: [PATCH v1 3/6] driver: Google EFI SMI

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Message-ID: <20110220044440.GA28167@auslistsprd01.us.dell.com>
Date:	Sat, 19 Feb 2011 22:44:40 -0600
From:	Matt Domsch <Matt_Domsch@...l.com>
To:	Mike Waychison <mikew@...gle.com>
Cc:	Greg KH <greg@...ah.com>, torvalds@...ux-foundation.org,
	San Mehat <san@...gle.com>, Aaron Durbin <adurbin@...gle.com>,
	Duncan Laurie <dlaurie@...gle.com>,
	linux-kernel@...r.kernel.org, Tim Hockin <thockin@...gle.com>
Subject: Re: [PATCH v1 3/6] driver: Google EFI SMI

On Thu, Jan 27, 2011 at 03:41:06PM -0800, Mike Waychison wrote:
> On Wed, Jan 26, 2011 at 5:22 PM, Mike Waychison <mikew@...gle.com> wrote:
> 
> I've spent the last few hours looking at efivars.c and working out how
> I can refactor it to reuse all the kobject bits it uses.  Does anybody
> use this thing though?
> 
> I can't believe I was just lectured for crappy ABI when this thing
> takes a binary packed struct on write() and process it:
>    - without regard to write length, and
>    - in a way that isn't compatible across compat (both DataSize and
> Status are unsigned long!).
> 
> 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));
> 
> :(

I wrote that long before anyone believed there could be a 32-bit EFI
or 32-bit kernel running on a 64-bit EFI.  Remember, this originated
on Itanium.  I knew it was ugly, but the EFI spec itself defined the
DataSize and Status as they did.

-- 
Matt Domsch
Technology Strategist
Dell | Office of the CTO
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