diff --git a/include/system.h b/include/system.h
index 383533c..db29a16 100644
--- a/include/system.h
+++ b/include/system.h
@@ -4,4 +4,5 @@ extern int stack_top;
 extern int _kernel_pstart;
 extern int _kernel_pend;
 extern int _kernel_start;
+extern int _kernel_tend;
 extern int _kernel_end;
diff --git a/src/x86/linker.ld b/src/x86/linker.ld
old mode 100755
new mode 100644
index c0c4709..a564c39
--- a/src/x86/linker.ld
+++ b/src/x86/linker.ld
@@ -37,6 +37,7 @@ SECTIONS
 	_kernel_pstart = PHYSICAL_BASE;
 	_kernel_pend = PHYSICAL_BASE + (4096 * IMAGE_SIZE);
 	_kernel_start = VIRTUAL_BASE;
+	_kernel_tend = VIRTUAL_BASE + SIZEOF(.text) + SIZEOF(.rodata);
 	_kernel_end = VIRTUAL_BASE + (4096 * IMAGE_SIZE);
 	_entry_paddr = _start - _kernel_start + _kernel_pstart;
 }