linux-kernel - Re: [PATCH 5/6] Begin abstraction of sensitive instructions: asm files

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Message-ID: <20060730105228.GA5810@elf.ucw.cz>
Date:	Sun, 30 Jul 2006 12:52:28 +0200
From:	Pavel Machek <pavel@....cz>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	lkml - Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/6] Begin abstraction of sensitive instructions: asm files

On Sat 2006-07-22 10:14:34, Rusty Russell wrote:
> (forgot to send this to lkml before)
> 
> Abstract sensitive instructions in assembler code, replacing them with
> macros (which currently are #defined to the native versions).  We use
> long names: assembler is case-insensitive, so if something goes wrong
> and macros do not expand, it would assemble anyway.
> 
> Resulting object files are exactly the same as before.
> 
> Signed-off-by Rusty Russell <rusty@...tcorp.com.au>
> 
> Index: working-2.6.18-rc2-hg-paravirt/arch/i386/kernel/entry.S
> ===================================================================
> --- working-2.6.18-rc2-hg-paravirt.orig/arch/i386/kernel/entry.S	2006-07-21 21:09:22.000000000 +1000
> +++ working-2.6.18-rc2-hg-paravirt/arch/i386/kernel/entry.S	2006-07-22 04:32:25.000000000 +1000
> @@ -76,8 +76,15 @@
>  NT_MASK		= 0x00004000
>  VM_MASK		= 0x00020000
>  
> +/* These are replaces for paravirtualization */
> +#define DISABLE_INTERRUPTS		cli
> +#define ENABLE_INTERRUPTS		sti
> +#define ENABLE_INTERRUPTS_SYSEXIT	sti; sysexit
> +#define INTERRUPT_RETURN		iret

Could we use some less verbose names, like possibly CLI, STI,
STI_SYSEXIT, IRET ?

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