From ada6dc727a813239c7b2e6996cb513cad2394bec Mon Sep 17 00:00:00 2001
From: Stefan Lankes <lankes@lfbs.rwth-aachen.de>
Date: Fri, 23 Sep 2011 11:52:43 -0700
Subject: [PATCH] add the possibility to enable the L1 cache for the receive
 buffer

---
 drivers/net/rckemac.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/net/rckemac.c b/drivers/net/rckemac.c
index 07b538ad..3dafb0f4 100644
--- a/drivers/net/rckemac.c
+++ b/drivers/net/rckemac.c
@@ -43,6 +43,15 @@
 #include <netif/etharp.h>
 #include <net/rckemac.h>
 
+/* enables the cache for the receive buffers */
+//#define RX_CACHING	1
+
+#ifdef RX_CACHING
+#define CL1INV		asm volatile ( ".byte 0x0f; .byte 0x0a;\n" ) // CL1FLUSHMB
+#else
+#define CL1INV
+#endif
+
 /* Limits */
 #define BUFFER_ORDER			9
 #define BUFFER_NUM			(1 << BUFFER_ORDER)
@@ -379,6 +388,8 @@ static void rckemacif_rx_handler(struct netif* netif, unsigned int write_offset)
         }
  
 again:
+	CL1INV; // invalidate L1 cache entries of the receiver buffers
+
 	read_offset++;
 	if (read_offset < 1 || read_offset > rckemacif->rx_buffer_max) {
 		read_offset = 1;
@@ -586,7 +597,11 @@ err_t rckemacif_init(struct netif* netif)
 	rckemacif->core = core;
 
 	/* allocate the receive buffer */
+#ifdef RX_CACHING
+	rckemacif->rx_buffer = mem_allocation(BUFFER_SIZE, MAP_KERNEL_SPACE|MAP_MPE);
+#else
 	rckemacif->rx_buffer = mem_allocation(BUFFER_SIZE, MAP_KERNEL_SPACE|MAP_NO_CACHE);
+#endif
 	if (!(rckemacif->rx_buffer)) {
 		LWIP_DEBUGF(NETIF_DEBUG, ("rckemacif_init: out of memory\n"));
 		kfree(rckemacif, sizeof(rckemacif_t));