sandbox: memblock: align allocated pointers to 16-byte boundary

sandbox/memblock/memblock.c

@@ -14,7 +14,7 @@
   - Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.
-  
+
   - Neither the name of the copyright holder nor the names of its
     contributors may be used to endorse or promote products derived from this
     software without specific prior written permission.
@@ -214,7 +214,7 @@ int memblock_add(uintptr_t base, size_t size)
 		if (memblock.reserved.count >= memblock.reserved.max - 2) {
 			memblock_double_capacity(&memblock.reserved);
 		}
-		
+
 		memblock_double_capacity(&memblock.memory);
 	}
 
@@ -226,7 +226,7 @@ int memblock_reserve(uintptr_t base, size_t size)
 	if (memblock.reserved.count >= memblock.reserved.max - 2) {
 		memblock_double_capacity(&memblock.reserved);
 	}
-		
+
 	return memblock_add_range(&memblock.reserved, base, size, MEMBLOCK_RESERVED);
 }
 
@@ -239,6 +239,11 @@ static phys_addr_t do_alloc(size_t size)
 
 	memblock_iter_t it;
 	for_each_free_mem_range (&it, region_start, region_end) {
+		if (it.it_base & 0xF) {
+			it.it_base &= ~0xF;
+			it.it_base += 0x10;
+		}
+
 		size_t region_size = it.it_limit - it.it_base + 1;
 		if (region_size >= size) {
 			allocated_base = it.it_base;