Changeset 604 for soft

Timestamp:

Jul 13, 2015, 3:10:26 PM (9 years ago)

Author:

guerin

Message:

tty: always acknowledge TTY IRQ

File:

• soft/giet_vm/giet_drivers/tty_driver.c (modified) (2 diffs)

soft/giet_vm/giet_drivers/tty_driver.c

@@ -63 +63 @@
     unsigned int cluster_xy = gpid >> P_WIDTH;
 
-    // get TTY status
-    unsigned int status = _tty_get_register( channel, TTY_STATUS );
-
-    // check both TTY status and kernel buffer status:
-    // does nothing if kernel buffer full or tty_buffer empty
-    if ( ((status & 0x1) == 0) || 
-         (_tty_rx_full[channel] != 0) )  return;
- 
     // reset WTI in XCU if WTI type
     if ( irq_type == IRQ_TYPE_WTI ) 
@@ -78 +70 @@
     }
 
-    // transfer character to kernel buffer and acknowledge TTY IRQ 
+    // transfer character to kernel buffer and acknowledge TTY IRQ
     _tty_rx_buf[channel]  = _tty_get_register( channel, TTY_READ ); 
 
+    // flush pending memory writes
+    asm volatile( "sync" );
+
     // set kernel buffer status
-    asm volatile( "sync" );
     _tty_rx_full[channel] = 1;