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ARM: let CPUs not being able to run in ARM mode enter in THUMB mode

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Some ARM cores are not capable to run in ARM mode (e.g. Cortex-M3). So
obviously these cannot enter the kernel in ARM mode. Make an exception
for them and let them enter in THUMB mode.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Message-Id: 1358162123-30113-1-git-send-email-u.kleine-koenig@pengutronix.de
Acked-by: Nicolas Pitre <nico@linaro.org>
This commit is contained in:
Uwe Kleine-König
2011-12-09 20:52:10 +01:00
parent b849a60e09
commit bc7dea00a9
3 changed files with 17 additions and 3 deletions
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8
arch/arm/kernel/head-nommu.S
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@@ -32,15 +32,21 @@
* numbers for r1.
*
*/
.arm
__HEAD
#ifdef CONFIG_CPU_THUMBONLY
.thumb
ENTRY(stext)
#else
.arm
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: )
#endif
setmode PSR_F_BIT | PSR_I_BIT | SVC_MODE, r9 @ ensure svc mode
@ and irqs disabled