[xen staging] arm/mpu: Introduce MPU memory region map structure

[patchbot@xxxxxxx]

commit e67914d91ba0c15fd2e17cb2ddab8b02a988634d
Author:     Penny Zheng <Penny.Zheng@xxxxxxx>
AuthorDate: Fri May 23 07:54:02 2025 +0100
Commit:     Michal Orzel <michal.orzel@xxxxxxx>
CommitDate: Fri May 30 08:44:15 2025 +0200

    arm/mpu: Introduce MPU memory region map structure
    
    Introduce pr_t typedef which is a structure having the prbar
    and prlar members, each being structured as the registers of
    the AArch64 Armv8-R architecture.
    
    Signed-off-by: Penny Zheng <penny.zheng@xxxxxxx>
    Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
    Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx>
    Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
    Reviewed-by: Michal Orzel <michal.orzel@xxxxxxx>
---
 xen/arch/arm/include/asm/arm64/mpu.h | 52 ++++++++++++++++++++++++++++++++++++
 xen/arch/arm/include/asm/mpu.h       |  4 +++
 2 files changed, 56 insertions(+)

diff --git a/xen/arch/arm/include/asm/arm64/mpu.h 
b/xen/arch/arm/include/asm/arm64/mpu.h
new file mode 100644
index 0000000000..4737868507
--- /dev/null
+++ b/xen/arch/arm/include/asm/arm64/mpu.h
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#ifndef ARM_ARM64_MPU_H
+#define ARM_ARM64_MPU_H
+
+#ifndef __ASSEMBLY__
+
+/* Protection Region Base Address Register */
+typedef union {
+    struct __packed {
+        unsigned long xn_0:1;     /* Execute-Never XN[0] */
+        unsigned long xn:1;       /* Execute-Never XN[1] */
+        unsigned long ap_0:1;     /* Access Permission AP[0] */
+        unsigned long ro:1;       /* Access Permission AP[1] */
+        unsigned long sh:2;       /* Shareability */
+        unsigned long base:42;    /* Base Address */
+        unsigned long res0:16;    /* RES0 */
+    } reg;
+    uint64_t bits;
+} prbar_t;
+
+/* Protection Region Limit Address Register */
+typedef union {
+    struct __packed {
+        unsigned long en:1;     /* Region enable */
+        unsigned long ai:3;     /* Memory Attribute Index */
+        unsigned long ns:1;     /* Not-Secure */
+        unsigned long res0:1;   /* RES0 */
+        unsigned long limit:42; /* Limit Address */
+        unsigned long res1:16;  /* RES0 */
+    } reg;
+    uint64_t bits;
+} prlar_t;
+
+/* MPU Protection Region */
+typedef struct {
+    prbar_t prbar;
+    prlar_t prlar;
+} pr_t;
+
+#endif /* __ASSEMBLY__ */
+
+#endif /* ARM_ARM64_MPU_H */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/arch/arm/include/asm/mpu.h b/xen/arch/arm/include/asm/mpu.h
index d4ec4248b6..bb83f5a5f5 100644
--- a/xen/arch/arm/include/asm/mpu.h
+++ b/xen/arch/arm/include/asm/mpu.h
@@ -6,6 +6,10 @@
 #ifndef __ARM_MPU_H__
 #define __ARM_MPU_H__
 
+#if defined(CONFIG_ARM_64)
+# include <asm/arm64/mpu.h>
+#endif
+
 #define MPU_REGION_SHIFT  6
 #define MPU_REGION_ALIGN  (_AC(1, UL) << MPU_REGION_SHIFT)
 #define MPU_REGION_MASK   (~(MPU_REGION_ALIGN - 1))
--
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