[PATCH v3 23/52] xen/arm: create mpu/layout.h for MPU related address definitions

[Penny Zheng <Penny.Zheng@xxxxxxx>]

From: Wei Chen <wei.chen@xxxxxxx>

As we have done for MMU systems, we instroduce mpu/layout.h for
MPU systems to store their address layout definitions.

To avoid spreading #ifdef everywhere, we keep the same definition
names for MPU systems, like XEN_VIRT_START and HYPERVISOR_VIRT_START,
but the definition contents are MPU specific.

Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
Signed-off-by: Penny Zheng <penny.zheng@xxxxxxx>
---
v3:
- new commit
---
 xen/arch/arm/include/asm/config.h     |  2 ++
 xen/arch/arm/include/asm/mpu/layout.h | 32 +++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)
 create mode 100644 xen/arch/arm/include/asm/mpu/layout.h

diff --git a/xen/arch/arm/include/asm/config.h 
b/xen/arch/arm/include/asm/config.h
index 204b3dec13..bd71cc1373 100644
--- a/xen/arch/arm/include/asm/config.h
+++ b/xen/arch/arm/include/asm/config.h
@@ -73,6 +73,8 @@
 
 #ifndef CONFIG_HAS_MPU
 #include <asm/mmu/layout.h>
+#else
+#include <asm/mpu/layout.h>
 #endif
 
 #define NR_hypercalls 64
diff --git a/xen/arch/arm/include/asm/mpu/layout.h 
b/xen/arch/arm/include/asm/mpu/layout.h
new file mode 100644
index 0000000000..84c55cb2bd
--- /dev/null
+++ b/xen/arch/arm/include/asm/mpu/layout.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef __ARM_MPU_LAYOUT_H__
+#define __ARM_MPU_LAYOUT_H__
+
+#define FRAMETABLE_SIZE        GB(32)
+#define FRAMETABLE_NR          (FRAMETABLE_SIZE / sizeof(*frame_table))
+
+#define XEN_START_ADDRESS CONFIG_XEN_START_ADDRESS
+
+/*
+ * All MPU platforms need to provide a XEN_START_ADDRESS for linker. This
+ * address indicates where Xen image will be loaded and run from. This
+ * address must be aligned to a PAGE_SIZE.
+ */
+#if (XEN_START_ADDRESS % PAGE_SIZE) != 0
+#error "XEN_START_ADDRESS must be aligned to PAGE_SIZE"
+#endif
+
+#define XEN_VIRT_START         _AT(paddr_t, XEN_START_ADDRESS)
+
+#define HYPERVISOR_VIRT_START  XEN_VIRT_START
+
+#endif /* __ARM_MPU_LAYOUT_H__ */
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
-- 
2.25.1