sandbox: vm: enforce alignment requirements for multi-page blocks

sandbox/vm/vm_page.c

@@ -85,3 +85,33 @@ size_t vm_page_order_to_bytes(vm_page_order_t order)
 
 	return page_order_bytes[order];
 }
+
+phys_addr_t vm_page_order_to_pages(vm_page_order_t order)
+{
+	if (order < 0 || order > VM_PAGE_MAX_ORDER) {
+		return 0;
+	}
+
+	return page_order_bytes[order] >> VM_PAGE_SHIFT;
+}
+
+vm_alignment_t vm_page_order_to_alignment(vm_page_order_t order)
+{
+	if (order < 0 || order > VM_PAGE_MAX_ORDER) {
+		return 0;
+	}
+
+	return ~(page_order_bytes[order] - 1);
+}
+
+
+size_t vm_bytes_to_pages(size_t bytes)
+{
+	if (bytes & (VM_PAGE_SIZE-1)) {
+		bytes &= ~(VM_PAGE_SIZE-1);
+		bytes += VM_PAGE_SIZE;
+	}
+
+	bytes >>= VM_PAGE_SHIFT;
+	return bytes;
+}