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Re: [PATCH 5/9] arm/mpu: Introduce utility functions for the pr_t type
- To: Luca Fancellu <luca.fancellu@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Ayan Kumar Halder <ayankuma@xxxxxxx>
- Date: Tue, 4 Mar 2025 11:36:27 +0000
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Tue, 04 Mar 2025 11:36:50 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hi Luca,
On 28/02/2025 16:18, Luca Fancellu wrote:
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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;
+}
+
This is common between arm32 and arm64. This can be moved to a common file.
- Ayan
#endif /* __ASSEMBLY__ */
#endif /* __ARM64_MPU_H__ */
--
2.34.1
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