vm: object: add prefetch function to fetch missing pages

2026-04-30 19:09:41 +01:00
parent 607efa961f
commit d63c2dbd12
3 changed files with 78 additions and 9 deletions
@@ -516,6 +516,33 @@ static kern_status_t request_page(
 	return status;
 }

+kern_status_t vm_object_prefetch(
+	struct vm_object *vo,
+	off_t offset,
+	size_t length,
+	unsigned long *irq_flags)
+{
+	offset &= ~VM_PAGE_MASK;
+	if (length & VM_PAGE_MASK) {
+		length &= ~VM_PAGE_MASK;
+		length += VM_PAGE_SIZE;
+	}
+
+	for (off_t i = offset; i < offset + length; i += VM_PAGE_SIZE) {
+		struct vm_page *pg = vm_object_get_page(
+			vo,
+			i,
+			VMO_ALLOCATE_MISSING_PAGE | VMO_REQUEST_MISSING_PAGE,
+			irq_flags);
+		if (!pg) {
+			/* TODO get error code from vm_object_get_page */
+			return KERN_NO_MEMORY;
+		}
+	}
+
+	return KERN_OK;
+}
+
 struct vm_page *vm_object_get_page(
 	struct vm_object *vo,
 	off_t offset,