Add core support for ARMv6/v7 big-endian
Starting with ARMv6, the CPUs support the BE-8 variant of big-endian
(byte-invariant). This patch adds the core support:
- setting of the BE-8 mode via the CPSR.E register for both kernel and
user threads
- big-endian page table walking
- REV used to rotate instructions read from memory during fault
processing as they are still little-endian format
- Kconfig and Makefile support for BE-8. The --be8 option must be passed
to the final linking stage to convert the instructions to
little-endian
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 76bbcde..a25f34b 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -639,6 +639,20 @@
port must properly enable any big-endian related features
of your chipset/board/processor.
+config CPU_ENDIAN_BE8
+ bool
+ depends on CPU_BIG_ENDIAN
+ default CPU_V6 || CPU_V7
+ help
+ Support for the BE-8 (big-endian) mode on ARMv6 and ARMv7 processors.
+
+config CPU_ENDIAN_BE32
+ bool
+ depends on CPU_BIG_ENDIAN
+ default !CPU_ENDIAN_BE8
+ help
+ Support for the BE-32 (big-endian) mode on pre-ARMv6 processors.
+
config CPU_HIGH_VECTOR
depends on !MMU && CPU_CP15 && !CPU_ARM740T
bool "Select the High exception vector"