linux-kernel - Re: [PATCH 2/3] arm: mm: do not set missing flags on ScorpionMP

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Date:	Wed, 28 Jul 2010 15:51:35 -0700
From:	Daniel Walker <dwalker@...eaurora.org>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Jeff Ohlstein <johlstei@...eaurora.org>,
	linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Steve Muckle <smuckle@...eaurora.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Tony Lindgren <tony@...mide.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>
Subject: Re: [PATCH 2/3] arm: mm: do not set missing flags on ScorpionMP

On Wed, 2010-07-28 at 23:36 +0100, Russell King - ARM Linux wrote:
> On Wed, Jul 28, 2010 at 02:58:00PM -0700, Daniel Walker wrote:
> > On Sat, 2010-07-24 at 09:23 +0100, Russell King - ARM Linux wrote:
> > > On Fri, Jul 23, 2010 at 11:58:02AM -0700, Jeff Ohlstein wrote:
> > > > From: Steve Muckle <smuckle@...eaurora.org>
> > > > 
> > > > ScorpionMP does not have the SMP/nAMP mode and TLB ops
> > > > broadcasting bits in the ACTLR.
> > > 
> > > Please provide a separate instance of __v7_proc_info for your processor
> > > and direct it to jump into the __v7_setup code after this setup instead.
> > 
> > 
> > You mean add another label into __v7_setup along with a proc-msm.S to
> > jump over this code?
> 
> Yes to the first, no to the second.
> 

Like so? I haven't tested this.

diff --git a/arch/arm/mm/proc-v7.S b/arch/arm/mm/proc-v7.S
index 6bddf5d..167bedb 100644
--- a/arch/arm/mm/proc-v7.S
+++ b/arch/arm/mm/proc-v7.S
@@ -196,6 +196,7 @@ __v7_setup:
 	orreq	r0, r0, #(1 << 6) | (1 << 0)	@ Enable SMP/nAMP mode and
 	mcreq	p15, 0, r0, c1, c0, 1		@ TLB ops broadcasting
 #endif
+__v7_msm_setup:
 	adr	r12, __v7_setup_stack		@ the local stack
 	stmia	r12, {r0-r5, r7, r9, r11, lr}
 	bl	v7_flush_dcache_all
@@ -326,6 +327,29 @@ cpu_elf_name:
 
 	.section ".proc.info.init", #alloc, #execinstr
 
+	.type   __v7_msm_proc_info, #object
+__v7_msm_proc_info:
+	.long	0x000f0000		@ Required ID value
+	.long	0x000f0000		@ Mask for ID
+	.long   PMD_TYPE_SECT | \
+		PMD_SECT_AP_WRITE | \
+		PMD_SECT_AP_READ | \
+		PMD_FLAGS
+	.long   PMD_TYPE_SECT | \
+		PMD_SECT_XN | \
+		PMD_SECT_AP_WRITE | \
+		PMD_SECT_AP_READ
+	b	__v7_msm_setup
+	.long	cpu_arch_name
+	.long	cpu_elf_name
+	.long	HWCAP_SWP|HWCAP_HALF|HWCAP_THUMB|HWCAP_FAST_MULT|HWCAP_EDSP
+	.long	cpu_v7_name
+	.long	v7_processor_functions
+	.long	v7wbi_tlb_fns
+	.long	v6_user_fns
+	.long	v7_cache_fns
+	.size	__v7_msm_proc_info, . - __v7_msm_proc_info
+
 	/*
 	 * Match any ARMv7 processor core.
 	 */


-- 
Sent by an consultant of the Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum.

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