[PATCH 2/3] ARM: mmu: Add VBAR setup

[Andrey Smirnov <andrew.smirnov@gmail.com>]

Add code to make sure that normal vector exception table, when it is
used due to unavailability of the high vector table, was not re-mapped
from 0x0 via VBAR by someone else before us.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
---
Changes since v1 (http://lists.infradead.org/pipermail/barebox/2015-December/025685.html):

	- Check CPU architecture at runtime
---

 arch/arm/cpu/mmu.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm/cpu/mmu.c b/arch/arm/cpu/mmu.c
index 784221c..bc5325f 100644
--- a/arch/arm/cpu/mmu.c
+++ b/arch/arm/cpu/mmu.c
@@ -302,6 +302,16 @@ static void vectors_init(void)
 		 * live without being able to catch NULL pointer dereferences
 		 */
 		exc = arm_create_pte(0x0);
+
+		if (cpu_architecture() >= CPU_ARCH_ARMv7) {
+			/*
+			 * ARMv7 CPUs allow to remap low vectors from
+			 * 0x0 to an arbitrary address using VBAR
+			 * register, so let's make sure we have it
+			 * pointing to the correct address
+			 */
+			set_vbar(0x0);
+		}
 	}

 	arm_fixup_vectors();
--
2.5.0

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