1 files changed, 83 insertions, 0 deletions
diff --git a/firmware/microblaze/lib/bsm12.h b/firmware/microblaze/lib/bsm12.h
new file mode 100644
index 000000000..b8e576b79
--- /dev/null
+++ b/firmware/microblaze/lib/bsm12.h
@@ -0,0 +1,83 @@
+/* -*- c++ -*- */
+/*
+ * Copyright 2009 Free Software Foundation, Inc.
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef INCLUDED_BSM12_H
+#define INCLUDED_BSM12_H
+
+#include "dbsm.h"
+#include "memory_map.h"
+
+/*!
+ * buffer state machine: 1 input to two outputs
+ *
+ * Typically used to read packets from the ethernet and then after inspecting,
+ * handle the packet in firmware or pass it on to 1 of the 2 buffer destinations.
+ */
+
+struct _bsm12;
+typedef struct _bsm12 bsm12_t;
+
+/*!
+ * Pointer to function that does packet inspection.
+ *
+ * \param sm		the state machine
+ * \param buf_this	the index of the buffer to inspect and/or pass on
+ *
+ * Returns -1, 0 or 1.  If it returns -1, it means that the s/w
+ * handled that packet, and that it should NOT be passed on to one of
+ * the buffer endpoints.  0 indicates the first endpoint, 1 the second endpoint.
+ */
+typedef int (*bsm12_inspector_t)(bsm12_t *sm, int buf_this);
+
+
+/*!
+ * buffer state machine: 1 input to two outputs
+ */
+struct _bsm12
+{
+  uint8_t	  buf0;	 // This machine uses buf0, buf0+1 and buf0+2.  buf0 % 4 == 0.
+  uint8_t	  running;
+  int8_t	  rx_state;	// -1, 0, 1, 2  which buffer we're receiving into
+  int8_t	  tx_state[2];	// -1, 0, 1, 2  which buffer we're sending from
+  buf_cmd_args_t  recv_args;
+  buf_cmd_args_t  send_args[2];
+  bsm12_inspector_t inspect;
+  int		  last_line_adj;
+  uint32_t	  bps_error;
+  uint32_t	  bps_done;
+  uint32_t	  bps_error_or_done;
+  uint8_t	  next_buf[NBUFFERS];
+  uint32_t	  precomputed_receive_to_buf_ctrl_word[3];
+  uint32_t	  precomputed_send_from_buf_ctrl_word[4][2];  // really only 3, not 4 
+                                                              //   (easier addr comp)
+};
+
+void bsm12_init(bsm12_t *sm, int buf0,
+		const buf_cmd_args_t *recv,
+		const buf_cmd_args_t *send0,
+		const buf_cmd_args_t *send1,
+		bsm12_inspector_t inspect);
+
+void bsm12_start(bsm12_t *sm);
+void bsm12_stop(bsm12_t *sm);
+void bsm12_process_status(bsm12_t *sm, uint32_t status);
+void bsm12_handle_tx_underrun(bsm12_t *sm);
+void bsm12_handle_rx_overrun(bsm12_t *sm);
+
+
+#endif /* INCLUDED_BSM12_H */