linux-kernel - RE: [PATCH - 2/2] arm: disable caches based on config option

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Date:	Thu, 30 Aug 2012 20:18:49 +0000
From:	"Karicheri, Muralidharan" <m-karicheri2@...com>
To:	Nicolas Pitre <nicolas.pitre@...aro.org>
CC:	Russell King - ARM Linux <linux@....linux.org.uk>,
	"tony@...mide.com" <tony@...mide.com>,
	"Shilimkar, Santosh" <santosh.shilimkar@...com>,
	"wim@...ana.be" <wim@...ana.be>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH - 2/2] arm: disable caches based on config option

Submitted. Thanks.

Murali Karicheri
Software Design Engineer


>> -----Original Message-----
>> From: Nicolas Pitre [mailto:nicolas.pitre@...aro.org]
>> Sent: Thursday, August 30, 2012 11:59 AM
>> To: Karicheri, Muralidharan
>> Cc: Russell King - ARM Linux; tony@...mide.com; Shilimkar, Santosh; wim@...ana.be;
>> linux-arm-kernel@...ts.infradead.org; linux-kernel@...r.kernel.org
>> Subject: Re: [PATCH - 2/2] arm: disable caches based on config option
>> 
>> On Thu, 30 Aug 2012, Murali Karicheri wrote:
>> 
>> > CONFIG_CPU_ICACHE_DISABLE and CONFIG_CPU_DCACHE_DISABLE are available
>> > to allow disabling of D-Cache and I-Cache. However the compressed version
>> > of head.S currently doesn't check these variables. This patch will fix
>> > this issue and is written similar to the uncompressed version of head.S
>> >
>> > Signed-off-by: Murali Karicheri <m-karicheri2@...com>
>> 
>> Acked-by: nicolas Pitre <nico@...aro.org>
>> 
>> You may submit your patch to http://www.arm.linux.org.uk/developer/patches/.
>> 
>> 
>> > ---
>> >  arch/arm/boot/compressed/head.S |    6 ++++++
>> >  1 file changed, 6 insertions(+)
>> >
>> > diff --git a/arch/arm/boot/compressed/head.S b/arch/arm/boot/compressed/head.S
>> > index b8c64b8..e1d2124 100644
>> > --- a/arch/arm/boot/compressed/head.S
>> > +++ b/arch/arm/boot/compressed/head.S
>> > @@ -659,6 +659,12 @@ __armv7_mmu_cache_on:
>> >  #ifdef CONFIG_CPU_ENDIAN_BE8
>> >  		orr	r0, r0, #1 << 25	@ big-endian page tables
>> >  #endif
>> > +#ifdef CONFIG_CPU_DCACHE_DISABLE
>> > +		bic	r0, r0, #1 << 2
>> > +#endif
>> > +#ifdef CONFIG_CPU_ICACHE_DISABLE
>> > +		bic	r0, r0, #1 << 12
>> > +#endif
>> >  		orrne	r0, r0, #1		@ MMU enabled
>> >  		movne	r1, #0xfffffffd		@ domain 0 = client
>> >  		mcrne	p15, 0, r3, c2, c0, 0	@ load page table pointer
>> > --
>> > 1.7.9.5
>> >
--
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