[PATCH 5/9] arm/mpu: Introduce utility functions for the pr_t type

[Luca Fancellu <luca.fancellu@xxxxxxx>]

Introduce few utility function to manipulate and handle the
pr_t type.

Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx>
---
 xen/arch/arm/include/asm/arm64/mpu.h | 36 ++++++++++++++++++++++++++++
 1 file changed, 36 insertions(+)

diff --git a/xen/arch/arm/include/asm/arm64/mpu.h 
b/xen/arch/arm/include/asm/arm64/mpu.h
index c63a9e6e5455..3a09339818a0 100644
--- a/xen/arch/arm/include/asm/arm64/mpu.h
+++ b/xen/arch/arm/include/asm/arm64/mpu.h
@@ -50,6 +50,42 @@ typedef struct {
     prlar_t prlar;
 } pr_t;
 
+/* Set base address of MPU protection region(pr_t). */
+static inline void pr_set_base(pr_t *pr, paddr_t base)
+{
+    pr->prbar.reg.base = (base >> MPU_REGION_SHIFT);
+}
+
+/* Set limit address of MPU protection region(pr_t). */
+static inline void pr_set_limit(pr_t *pr, paddr_t limit)
+{
+    pr->prlar.reg.limit = ((limit - 1) >> MPU_REGION_SHIFT);
+}
+
+/*
+ * Access to get base address of MPU protection region(pr_t).
+ * The base address shall be zero extended.
+ */
+static inline paddr_t pr_get_base(pr_t *pr)
+{
+    return (paddr_t)(pr->prbar.reg.base << MPU_REGION_SHIFT);
+}
+
+/*
+ * Access to get limit address of MPU protection region(pr_t).
+ * The limit address shall be concatenated with 0x3f.
+ */
+static inline paddr_t pr_get_limit(pr_t *pr)
+{
+    return (paddr_t)((pr->prlar.reg.limit << MPU_REGION_SHIFT)
+                     | ~MPU_REGION_MASK);
+}
+
+static inline bool region_is_valid(pr_t *pr)
+{
+    return pr->prlar.reg.en;
+}
+
 #endif /* __ASSEMBLY__ */
 
 #endif /* __ARM64_MPU_H__ */
-- 
2.34.1