xen/arm: Introduce helper for static memory pages

Introduce a new helper function in the static-memory module
that can be called to manage static memory banks, this is
done to reuse the code when other modules would like to
manage static memory banks that are not part of the
reserved_mem structure, this is done because the static
shared memory banks will be removed from reserved_mem.

Signed-off-by: Luca Fancellu <luca.fancellu@arm.com>
Reviewed-by: Michal Orzel <michal.orzel@amd.com>

xen/arch/arm/include/asm/static-memory.h

@@ -3,10 +3,23 @@
 #ifndef __ASM_STATIC_MEMORY_H_
 #define __ASM_STATIC_MEMORY_H_
 
+#include <xen/pfn.h>
 #include <asm/kernel.h>
 
 #ifdef CONFIG_STATIC_MEMORY
 
+static inline void init_staticmem_bank(const struct membank *bank)
+{
+    mfn_t bank_start = _mfn(PFN_UP(bank->start));
+    unsigned long bank_pages = PFN_DOWN(bank->size);
+    mfn_t bank_end = mfn_add(bank_start, bank_pages);
+
+    if ( mfn_x(bank_end) <= mfn_x(bank_start) )
+        return;
+
+    unprepare_staticmem_pages(mfn_to_page(bank_start), bank_pages, false);
+}
+
 void allocate_static_memory(struct domain *d, struct kernel_info *kinfo,
                             const struct dt_device_node *node);
 void assign_static_memory_11(struct domain *d, struct kernel_info *kinfo,

xen/arch/arm/static-memory.c

@@ -265,17 +265,7 @@ void __init init_staticmem_pages(void)
     for ( bank = 0 ; bank < reserved_mem->nr_banks; bank++ )
     {
         if ( reserved_mem->bank[bank].type == MEMBANK_STATIC_DOMAIN )
-        {
-            mfn_t bank_start = _mfn(PFN_UP(reserved_mem->bank[bank].start));
-            unsigned long bank_pages = PFN_DOWN(reserved_mem->bank[bank].size);
-            mfn_t bank_end = mfn_add(bank_start, bank_pages);
-
-            if ( mfn_x(bank_end) <= mfn_x(bank_start) )
-                return;
-
-            unprepare_staticmem_pages(mfn_to_page(bank_start),
-                                      bank_pages, false);
-        }
+            init_staticmem_bank(&reserved_mem->bank[bank]);
     }
 }