Add two functions to get/set VBAR register.
Signed-off-by: Andrey Smirnov <andrew.smirnov@xxxxxxxxx>
---
arch/arm/include/asm/system.h | 25 +++++++++++++++++++++++++
1 file changed, 25 insertions(+)
diff --git a/arch/arm/include/asm/system.h b/arch/arm/include/asm/system.h
index 26fb18c..2e37675 100644
--- a/arch/arm/include/asm/system.h
+++ b/arch/arm/include/asm/system.h
@@ -71,6 +71,31 @@ static inline void set_cr(unsigned int val)
isb();
}
+#if __LINUX_ARM_ARCH__ >= 7
+static inline unsigned int get_vbar(void)
+{
+ unsigned int vbar;
+ asm volatile("mrc p15, 0, %0, c12, c0, 0 @ get VBAR"
+ : "=r" (vbar) : : "cc");
+ return vbar;
+}
+
+static inline void set_vbar(unsigned int vbar)
+{
+ asm volatile("mcr p15, 0, %0, c12, c0, 0 @ set VBAR"
+ : : "r" (vbar) : "cc");
+ isb();
+}
+#else
+/*
+ Pre ARMv7 CPUs do not implement Security Extensions so normal
+ exceptions base address cannot be re-mapped from 0x00000000
+ */
+static inline unsigned int get_vbar(void) { return 0; }
+static inline void set_vbar(u32 vbar) {}
+#endif
+
+
#endif
#endif /* __ASM_ARM_SYSTEM_H */
--
2.5.0
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