[PATCH v3 1/7] arm/mpu: Introduce MPU memory region map structure

[Luca Fancellu <luca.fancellu@xxxxxxx>]

From: Penny Zheng <Penny.Zheng@xxxxxxx>

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.

Introduce the array 'xen_mpumap' that will store a view of
the content of the MPU regions.

Introduce MAX_MPU_REGIONS macro that uses the value of
NUM_MPU_REGIONS_MASK just for clarity, because using the
latter as number of elements of the xen_mpumap array might
be misleading.

Signed-off-by: Penny Zheng <penny.zheng@xxxxxxx>
Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
Signed-off-by: Luca Fancellu <luca.fancellu@xxxxxxx>
---
 xen/arch/arm/include/asm/arm64/mpu.h | 44 ++++++++++++++++++++++++++++
 xen/arch/arm/include/asm/mpu.h       |  5 ++++
 xen/arch/arm/mpu/mm.c                |  4 +++
 3 files changed, 53 insertions(+)
 create mode 100644 xen/arch/arm/include/asm/arm64/mpu.h

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 000000000000..4d2bd7d7877f
--- /dev/null
+++ b/xen/arch/arm/include/asm/arm64/mpu.h
@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * mpu.h: Arm Memory Protection Unit definitions for aarch64.
+ */
+
+#ifndef __ARM_ARM64_MPU_H__
+#define __ARM_ARM64_MPU_H__
+
+#ifndef __ASSEMBLY__
+
+/* Protection Region Base Address Register */
+typedef union {
+    struct __packed {
+        unsigned long xn:2;       /* Execute-Never */
+        unsigned long ap:2;       /* Acess Permission */
+        unsigned long sh:2;       /* Sharebility */
+        unsigned long base:46;    /* Base Address */
+        unsigned long pad:12;
+    } 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 res:1;    /* Reserved 0 by hardware */
+        unsigned long limit:46; /* Limit Address */
+        unsigned long pad:12;
+    } 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__ */
\ No newline at end of file
diff --git a/xen/arch/arm/include/asm/mpu.h b/xen/arch/arm/include/asm/mpu.h
index d4ec4248b62b..e148c705b82c 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))
@@ -13,6 +17,7 @@
 #define NUM_MPU_REGIONS_SHIFT   8
 #define NUM_MPU_REGIONS         (_AC(1, UL) << NUM_MPU_REGIONS_SHIFT)
 #define NUM_MPU_REGIONS_MASK    (NUM_MPU_REGIONS - 1)
+#define MAX_MPU_REGIONS         NUM_MPU_REGIONS_MASK
 
 #endif /* __ARM_MPU_H__ */
 
diff --git a/xen/arch/arm/mpu/mm.c b/xen/arch/arm/mpu/mm.c
index 07c8959f4ee9..f83ce04fef8a 100644
--- a/xen/arch/arm/mpu/mm.c
+++ b/xen/arch/arm/mpu/mm.c
@@ -7,9 +7,13 @@
 #include <xen/mm.h>
 #include <xen/sizes.h>
 #include <xen/types.h>
+#include <asm/mpu.h>
 
 struct page_info *frame_table;
 
+/* EL2 Xen MPU memory region mapping table. */
+pr_t xen_mpumap[MAX_MPU_REGIONS];
+
 static void __init __maybe_unused build_assertions(void)
 {
     /*
-- 
2.34.1