xen/arm32: mpu: Stubs to build MPU for arm32

Add stubs to enable compilation.

is_xen_heap_page() and is_xen_heap_mfn() are not implemented for arm32 MPU.
Thus, introduce the stubs for these functions in asm/mpu/mm.h and move the
original code to asm/mmu/mm.h (as it is used for arm32 MMU based system).

Signed-off-by: Ayan Kumar Halder <ayan.kumar.halder@amd.com>
Reviewed-by: Luca Fancellu <luca.fancellu@arm.com>
Reviewed-by: Michal Orzel <michal.orzel@amd.com>
Tested-by: Luca Fancellu <luca.fancellu@arm.com>

xen/arch/arm/arm32/mpu/Makefile

@@ -1 +1,3 @@
 obj-y += head.o
+obj-y += p2m.o
+obj-y += smpboot.o

xen/arch/arm/arm32/mpu/p2m.c

@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <asm/p2m.h>
+#include <xen/bug.h>
+#include <xen/init.h>
+
+void __init setup_virt_paging(void)
+{
+    BUG_ON("unimplemented");
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */

xen/arch/arm/arm32/mpu/smpboot.c

@@ -0,0 +1,26 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <xen/bug.h>
+#include <xen/errno.h>
+#include <xen/mm.h>
+#include <xen/stdbool.h>
+
+int prepare_secondary_mm(int cpu)
+{
+    BUG_ON("unimplemented");
+    return -EINVAL;
+}
+
+void update_boot_mapping(bool enable)
+{
+    BUG_ON("unimplemented");
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */

xen/arch/arm/include/asm/mm.h

@@ -170,14 +170,7 @@ struct page_info
 #define _PGC_need_scrub   _PGC_allocated
 #define PGC_need_scrub    PGC_allocated
 
-#ifdef CONFIG_ARM_32
-#define is_xen_heap_page(page) is_xen_heap_mfn(page_to_mfn(page))
-#define is_xen_heap_mfn(mfn) ({                                 \
-    unsigned long mfn_ = mfn_x(mfn);                            \
-    (mfn_ >= mfn_x(directmap_mfn_start) &&                      \
-     mfn_ < mfn_x(directmap_mfn_end));                          \
-})
-#else
+#ifdef CONFIG_ARM_64
 #define is_xen_heap_page(page) ((page)->count_info & PGC_xen_heap)
 #define is_xen_heap_mfn(mfn) \
     (mfn_valid(mfn) && is_xen_heap_page(mfn_to_page(mfn)))

xen/arch/arm/include/asm/mmu/mm.h

@@ -27,6 +27,13 @@ extern unsigned long directmap_base_pdx;
 })
 
 #ifdef CONFIG_ARM_32
+#define is_xen_heap_page(page) is_xen_heap_mfn(page_to_mfn(page))
+#define is_xen_heap_mfn(mfn) ({                                 \
+    unsigned long mfn_ = mfn_x(mfn);                            \
+    (mfn_ >= mfn_x(directmap_mfn_start) &&                      \
+     mfn_ < mfn_x(directmap_mfn_end));                          \
+})
+
 /**
  * Find the virtual address corresponding to a machine address
  *

xen/arch/arm/include/asm/mpu/mm.h

@@ -13,6 +13,11 @@ extern struct page_info *frame_table;
 
 #define virt_to_maddr(va) ((paddr_t)((vaddr_t)(va) & PADDR_MASK))
 
+#ifdef CONFIG_ARM_32
+#define is_xen_heap_page(page) ({ BUG_ON("unimplemented"); false; })
+#define is_xen_heap_mfn(mfn) ({ BUG_ON("unimplemented"); false; })
+#endif
+
 /* On MPU systems there is no translation, ma == va. */
 static inline void *maddr_to_virt(paddr_t ma)
 {

xen/arch/arm/mpu/Makefile

@@ -1,3 +1,4 @@
+obj-$(CONFIG_ARM_32) += domain-page.o
 obj-y += mm.o
 obj-y += p2m.o
 obj-y += setup.init.o

xen/arch/arm/mpu/domain-page.c

@@ -0,0 +1,45 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+#include <xen/bug.h>
+#include <xen/domain_page.h>
+#include <xen/mm-frame.h>
+#include <xen/types.h>
+
+void *map_domain_page_global(mfn_t mfn)
+{
+    BUG_ON("unimplemented");
+    return NULL;
+}
+
+/* Map a page of domheap memory */
+void *map_domain_page(mfn_t mfn)
+{
+    BUG_ON("unimplemented");
+    return NULL;
+}
+
+/* Release a mapping taken with map_domain_page() */
+void unmap_domain_page(const void *ptr)
+{
+    BUG_ON("unimplemented");
+}
+
+mfn_t domain_page_map_to_mfn(const void *ptr)
+{
+    BUG_ON("unimplemented");
+    return INVALID_MFN;
+}
+
+void unmap_domain_page_global(const void *va)
+{
+    BUG_ON("unimplemented");
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */