From mboxrd@z Thu Jan  1 00:00:00 1970
From: catalin.marinas@arm.com (Catalin Marinas)
Date: Tue, 27 Jan 2015 17:57:40 +0000
Subject: [PATCH 4/8] arm64: Add EL2 switch to soft_restart
In-Reply-To: <bb44d4eee4fab15278e4a8829a0981878bc9acd7.1421449714.git.geoff@infradead.org>
References: <cover.1421449714.git.geoff@infradead.org>
 <bb44d4eee4fab15278e4a8829a0981878bc9acd7.1421449714.git.geoff@infradead.org>
Message-ID: <20150127175740.GK3226@e104818-lin.cambridge.arm.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

On Sat, Jan 17, 2015 at 12:23:34AM +0000, Geoff Levand wrote:
>  ENTRY(cpu_reset)
> -	mrs	x1, sctlr_el1
> -	bic	x1, x1, #1
> -	msr	sctlr_el1, x1			// disable the MMU
> +	mrs	x2, sctlr_el1
> +	bic	x2, x2, #1
> +	msr	sctlr_el1, x2			// disable the MMU
>  	isb
> -	ret	x0
> +
> +	cbz	x0, 1f				// el2_switch?
> +	mov	x0, x1
> +	mov	x1, xzr
> +	mov	x2, xzr
> +	mov	x3, xzr
> +	hvc	#HVC_CALL_FUNC			// no return

If that's the only user of HVC_CALL_FUNC, why do we bother with
arguments, calling convention?

-- 
Catalin