1 files changed, 9 insertions, 8 deletions

diff --git a/src/controlregs.rs b/src/controlregs.rs
index 89242c2..b6cd334 100644
--- a/src/controlregs.rs
+++ b/src/controlregs.rs
@@ -1,44 +1,45 @@
-/// Contains various flags to control operations.
+//! Functions to read and write control registers.
+
 pub unsafe fn cr0() -> u64
 {
     let ret: u64;
-    asm!("mov %cr0, $0" : "=r" (ret) : );
+    asm!("mov %cr0, $0" : "=r" (ret));
     ret
 }
 
 /// Write cr0.
 pub unsafe fn cr0_write(val: u64)
 {
-    asm!("mov $0, %cr0" :: "r" (val));
+    asm!("mov $0, %cr0" :: "r" (val) : "memory");
 }
 
 /// Contains page-fault linear address.
 pub unsafe fn cr2() -> u64 {
     let ret: u64;
-    asm!("mov %cr2, $0" : "=r" (ret) :);
+    asm!("mov %cr2, $0" : "=r" (ret));
     ret
 }
 
 /// Contains page-table root pointer.
 pub unsafe fn cr3() -> u64 {
     let ret: u64;
-    asm!("mov %cr3, $0" : "=r" (ret) :);
+    asm!("mov %cr3, $0" : "=r" (ret));
     ret
 }
 
 /// Switch page-table PML4 pointer.
 pub unsafe fn cr3_write(val: u64) {
-    asm!("mov $0, %cr3" :: "r" (val));
+    asm!("mov $0, %cr3" :: "r" (val) : "memory");
 }
 
 /// Contains various flags to control operations in protected mode.
 pub unsafe fn cr4() -> u64 {
     let ret: u64;
-    asm!("mov %cr4, $0" : "=r" (ret) :);
+    asm!("mov %cr4, $0" : "=r" (ret));
     ret
 }
 
 /// Write cr4.
 pub unsafe fn cr4_write(val: u64) {
-    asm!("mov $0, %cr4" :: "r" (val));
+    asm!("mov $0, %cr4" :: "r" (val) : "memory");
 }