Only remap device memory region lazily

kernel/src/drivers/net/e1000.rs

@@ -72,11 +72,14 @@ impl Driver for E1000Interface {
     fn try_handle_interrupt(&self) -> bool {
         let irq = {
             let driver = self.driver.0.lock();
+
+            if let None = active_table().get_entry(driver.header) {
                 let mut current_addr = driver.header;
                 while current_addr < driver.header + driver.size {
                     active_table().map_if_not_exists(current_addr, current_addr);
                     current_addr = current_addr + PAGE_SIZE;
                 }
+            }
 
             let e1000 = unsafe {
                 slice::from_raw_parts_mut(driver.header as *mut Volatile<u32>, driver.size / 4)
@@ -115,12 +118,13 @@ impl Driver for E1000Interface {
 
 impl E1000 {
     fn transmit_available(&self) -> bool {
-        // TODO map it in all cpu
+        if let None = active_table().get_entry(self.header) {
             let mut current_addr = self.header;
             while current_addr < self.header + self.size {
                 active_table().map_if_not_exists(current_addr, current_addr);
                 current_addr = current_addr + PAGE_SIZE;
             }
+        }
 
         let e1000 =
             unsafe { slice::from_raw_parts_mut(self.header as *mut Volatile<u32>, self.size / 4) };
@@ -136,12 +140,13 @@ impl E1000 {
     }
 
     fn receive_available(&self) -> bool {
-        // TODO map it in all cpu
+        if let None = active_table().get_entry(self.header) {
             let mut current_addr = self.header;
             while current_addr < self.header + self.size {
                 active_table().map_if_not_exists(current_addr, current_addr);
                 current_addr = current_addr + PAGE_SIZE;
             }
+        }
 
         let e1000 =
             unsafe { slice::from_raw_parts_mut(self.header as *mut Volatile<u32>, self.size / 4) };

kernel/src/syscall/fs.rs

@@ -878,7 +878,6 @@ impl IoVecs {
 
     fn write_all_from_slice(&mut self, buf: &[u8]) {
         let mut copied_len = 0;
-        debug!("copy {:?}", buf);
         for slice in self.0.iter_mut() {
             let copy_len = min(slice.len(), buf.len() - copied_len);
             if copy_len == 0 {
@@ -886,7 +885,6 @@ impl IoVecs {
             }
 
             slice[..copy_len].copy_from_slice(&buf[copied_len..copied_len + copy_len]);
-            debug!("copy to {:?}", slice);
             copied_len += copy_len;
         }
     }