Changes between Version 49 and Version 50 of kernel_syscalls

Timestamp:

Dec 4, 2016, 8:50:52 PM (7 years ago)

Author:

alain

Comment:

--

kernel_syscalls

@@ -165 +165 @@
 Returns 0 if success, returns -1 if the socket is not allocated to calling thread.
 
-=== 6) int '''_sys_nic_write'''( unsigned int is_rx,  unsigned int channel ) ===
-This function displays on TTY0 the values stored in the NIC instrumentation registers (packet counters).
-* '''is_rx''' : boolean (RX channels if non zero)
- * '''channel''' : RX or TX channel index
+=== 6) int '''_sys_nic_write'''( unsigned int index , unsigned int vaddr , unsigned int count ) ===
+This blocking function moves a RAW packet from the user buffer to the kernel NIC_TX_FIFO, after building the ETH/IP/UDP headers. In this first implementation, we use a polling strategy in case of FIFO full.
+ * '''index''' : socket index.
+ * '''vaddr''' : virtual base address of source user buffer.
+ * '''count''' : number of bytes.
+Returns number of bytes written if success / returns -1 if error
+
+=== 7) int '''_sys_nic_read'''( unsigned int index , unsigned int vaddr , unsigned int count ) ===
+This blocking function moves a RAW packet from the kernel NIC_RX_FIFO, to the user buffer, after removing the ETH/IP/UDP headers. In this first implementation, we use a polling strategy in case of FIFO empty.
+ * '''index''' : socket index.
+ * '''vaddr''' : virtual base address of destination user buffer.
+ * '''count''' : max number of bytes in user buffer.
+Returns number of bytes read if success / returns -1 if error
+
 
 == FBF related syscall handlers ==