4.11 passes all tests

kernel/vm.c

@@ -356,8 +356,7 @@ uvmclear(pagetable_t pagetable, uint64 va)
 int load_from_file(char* file,
                    uint64 file_start_offset,
                    uint64 pa,
-                   uint64 nbytes
-  ){
+                   uint64 nbytes){
     struct inode* ip;
     begin_op(ROOTDEV);
     if((ip = namei(file)) == 0){
@@ -405,7 +404,23 @@ int do_allocate(pagetable_t pagetable, struct proc* p, uint64 addr){
 }
 
 int do_allocate_range(pagetable_t pagetable, struct proc* p, uint64 addr, uint64 len){
-  return 0;
+  int ret = 0;
+  uint64 base = PGROUNDDOWN(addr);
+
+  if(addr + len < base) return ENOVMA;
+
+  acquire(&p->vma_lock);
+  while(base < addr + len) {
+    ret = do_allocate(pagetable, p, base);
+
+    if (ret) {
+      release(&p->vma_lock);
+      return ret;}
+
+    base += PGSIZE;
+  }
+  release(&p->vma_lock);
+  return ret;
 }
 
 // Copy from kernel to user.