Changeset f6ef823a in rtems

Timestamp:

11/13/00 22:58:36 (23 years ago)

Author:

Joel Sherrill <joel.sherrill@…>

Branches:

4.10, 4.11, 4.8, 4.9, 5, master

Children:

f5f54cfa

Parents:

a44f9ca5

Message:

2000-11-13 Jiri Gaisler <jgais@…>

• network/sonic.c: Added ipalign() routine to align the received packet so that the ip header is on a 32-bit boundary. Necessary for cpu's that do not allow unaligned loads and stores and when the 32-bit DMA mode is used.

Location:

c/src/libchip

Files:

• ChangeLog (modified) (1 diff)
• network/sonic.c (modified) (1 diff)

c/src/libchip/ChangeLog

@@ +1 @@
+2000-11-13      Jiri Gaisler <jgais@ws.estec.esa.nl>
+
+        * network/sonic.c: Added ipalign() routine to align the
+        received packet so that the ip header is on a 32-bit boundary.
+        Necessary for cpu's that do not allow unaligned loads and stores
+        and when the 32-bit DMA mode is used.
+
 2000-11-09      Ralf Corsepius <corsepiu@faw.uni-ulm.de>
 

c/src/libchip/network/sonic.c

@@ -887 +887 @@
 
 }
+
+#ifdef CPU_U32_FIX
+
+/*
+ * Routine to align the received packet so that the ip header
+ * is on a 32-bit boundary. Necessary for cpu's that do not
+ * allow unaligned loads and stores and when the 32-bit DMA
+ * mode is used. 
+ * 
+ * Transfers are done on word basis to avoid possibly slow byte 
+ * and half-word writes.
+ */
+ 
+void ipalign(struct mbuf *m)
+{
+  unsigned int *first, *last, data;
+  unsigned int tmp = 0;
+
+  if ((((int) m->m_data) & 2) && (m->m_len)) {
+    last = (unsigned int *) ((((int) m->m_data) + m->m_len + 8) & ~3);
+    first = (unsigned int *) (((int) m->m_data) & ~3);
+    tmp = *first << 16;
+    first++;
+    do {
+      data = *first;
+      *first = tmp | (data >> 16);
+      tmp = data << 16;
+      first++;
+    } while (first <= last);
+
+    m->m_data = (caddr_t)(((int) m->m_data) + 2);
+  }
+}
+#endif
 
 /*