From: dave.martin@linaro.org (Dave Martin)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 2/4] ARM: head-nommu: Always enter the kernel in ARM state
Date: Mon, 20 Jun 2011 14:40:27 +0100 [thread overview]
Message-ID: <1308577229-23681-3-git-send-email-dave.martin@linaro.org> (raw)
In-Reply-To: <1308577229-23681-1-git-send-email-dave.martin@linaro.org>
This makes Image directly bootable; otherwise the kernel is reliant
on the zImage decompressor to switch to the correct instruction
set.
Signed-off-by: Dave Martin <dave.martin@linaro.org>
---
arch/arm/kernel/head-nommu.S | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S
index 6b1e0ad..d46f259 100644
--- a/arch/arm/kernel/head-nommu.S
+++ b/arch/arm/kernel/head-nommu.S
@@ -32,8 +32,16 @@
* numbers for r1.
*
*/
+ .arm
+
__HEAD
ENTRY(stext)
+
+ THUMB( adr r9, BSYM(1f) ) @ Kernel is always entered in ARM.
+ THUMB( bx r9 ) @ If this is a Thumb-2 kernel,
+ THUMB( .thumb ) @ switch to Thumb now.
+ THUMB(1: )
+
setmode PSR_F_BIT | PSR_I_BIT | SVC_MODE, r9 @ ensure svc mode
@ and irqs disabled
#ifndef CONFIG_CPU_CP15
--
1.7.4.1
next prev parent reply other threads:[~2011-06-20 13:40 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-06-20 13:40 [PATCH 0/4] Consistently enter the kernel in ARM state Dave Martin
2011-06-20 13:40 ` [PATCH 1/4] ARM: head: Always Enter " Dave Martin
2011-06-20 13:40 ` Dave Martin [this message]
2011-06-20 13:40 ` [PATCH 3/4] ARM: zImage: Jump to the decompressed kernel entry point " Dave Martin
2011-06-20 13:40 ` [PATCH 4/4] ARM: Documentation: clarify entry requirements for ARM versus Thumb-2 Dave Martin
2011-06-20 14:01 ` [PATCH 0/4] Consistently enter the kernel in ARM state Nicolas Pitre
2011-06-20 14:17 ` Dave Martin
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