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authorMarc Zyngier <Marc.Zyngier@arm.com>2012-10-06 17:03:17 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2012-10-09 12:11:34 +0100
commit2a552d5e63d7fa602c9a9a0717008737f55625a6 (patch)
tree0fbd4405ee99ba35cf508f67b01a932a89d71824 /arch/arm
parent648f3b69986b4d0ade57e59504a431b973ce2875 (diff)
downloadlinux-2a552d5e63d7fa602c9a9a0717008737f55625a6.tar.bz2
ARM: 7549/1: HYP: fix boot on some ARM1136 cores
It appears that performing a "movs pc, lr" to force the kernel into SVC mode on the OMAP2420 (ARM1136) prevents the platform from booting correctly (change introduced in 80c59da [ARM: virt: allow the kernel to be entered in HYP mode]). While the reason it fails is not understood yet (the same code runs fine on the OMAP2430, ARM1136 as well), partially revert that change for platforms that do not enter in HYP mode, preserving the new feature and restoring a working kernel on the OMAP2420. Reported-by: Tony Lindgren <tony@atomide.com> Acked-by: Nicolas Pitre <nico@linaro.org> Tested-by: Tony Lindgren <tony@atomide.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm')
-rw-r--r--arch/arm/include/asm/assembler.h9
1 files changed, 5 insertions, 4 deletions
diff --git a/arch/arm/include/asm/assembler.h b/arch/arm/include/asm/assembler.h
index 683a1e6b6020..2ef95813fce0 100644
--- a/arch/arm/include/asm/assembler.h
+++ b/arch/arm/include/asm/assembler.h
@@ -254,16 +254,17 @@
mov lr , \reg
and lr , lr , #MODE_MASK
cmp lr , #HYP_MODE
- orr \reg , \reg , #PSR_A_BIT | PSR_I_BIT | PSR_F_BIT
+ orr \reg , \reg , #PSR_I_BIT | PSR_F_BIT
bic \reg , \reg , #MODE_MASK
orr \reg , \reg , #SVC_MODE
THUMB( orr \reg , \reg , #PSR_T_BIT )
- msr spsr_cxsf, \reg
- adr lr, BSYM(2f)
bne 1f
+ orr \reg, \reg, #PSR_A_BIT
+ adr lr, BSYM(2f)
+ msr spsr_cxsf, \reg
__MSR_ELR_HYP(14)
__ERET
-1: movs pc, lr
+1: msr cpsr_c, \reg
2:
.endm