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| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2011-12-09 20:52:10 +0100 |
|---|---|---|
| committer | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2013-01-31 21:44:46 +0100 |
| commit | bc7dea00a9a0ea385bbc4aed67dfdcf7d8879953 (patch) | |
| tree | 242257c7c0a016595b672b3151abdf71ec5745a2 /arch/arm/kernel/head-nommu.S | |
| parent | b849a60e0903b1c5430c3859864554662e127a8d (diff) | |
| download | op-kernel-dev-bc7dea00a9a0ea385bbc4aed67dfdcf7d8879953.zip op-kernel-dev-bc7dea00a9a0ea385bbc4aed67dfdcf7d8879953.tar.gz | |
ARM: let CPUs not being able to run in ARM mode enter in THUMB mode
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>
Diffstat (limited to 'arch/arm/kernel/head-nommu.S')
| -rw-r--r-- | arch/arm/kernel/head-nommu.S | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/arch/arm/kernel/head-nommu.S b/arch/arm/kernel/head-nommu.S index 2c228a0..6a2e09c 100644 --- a/arch/arm/kernel/head-nommu.S +++ b/arch/arm/kernel/head-nommu.S @@ -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 |
