From c4a4e2e20ca226948b62ed116df98f7a3932f2ac Mon Sep 17 00:00:00 2001 From: Andre Przywara Date: Tue, 2 Apr 2013 05:43:36 +0000 Subject: [PATCH] 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 --- arch/arm/cpu/armv7/start.S | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/arch/arm/cpu/armv7/start.S b/arch/arm/cpu/armv7/start.S index 61da7ac..5feae7a 100644 --- a/arch/arm/cpu/armv7/start.S +++ b/arch/arm/cpu/armv7/start.S @@ -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 /* -- 2.7.4