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ARMv7: start.S: stay in HYP mode if u-boot is entered in it 

The KVM and Xen hypervisors for the Cortex-A15 virtualization
implementation need to be entered in HYP mode. Should the primary
board firmware already enter HYP mode (Calxeda firmware does that),
we should not deliberately drop back to SVC mode.
Since U-boot does not use the MMU, running in HYP mode is just fine.

Signed-off-by: Andre Przywara <andre.przywara@linaro.org>
This commit is contained in:
Andre Przywara 2013-04-02 05:43:36 +00:00 committed by Albert ARIBAUD
parent 8960af8ba9
commit c4a4e2e20c
1 changed files with 7 additions and 3 deletions
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10
arch/arm/cpu/armv7/start.S
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@ -130,11 +130,15 @@ IRQ_STACK_START_IN:
reset:
bl save_boot_params
/*
* set the cpu to SVC32 mode
* disable interrupts (FIQ and IRQ), also set the cpu to SVC32 mode,
* except if in HYP mode already
*/
mrs r0, cpsr
bic r0, r0, #0x1f
orr r0, r0, #0xd3
and r1, r0, #0x1f @ mask mode bits
teq r1, #0x1a @ test for HYP mode
bicne r0, r0, #0x1f @ clear all mode bits
orrne r0, r0, #0x13 @ set SVC mode
orr r0, r0, #0xc0 @ disable FIQ and IRQ
msr cpsr,r0
/*