first and last commit

arch/arm/dcc/dcc.c

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+/*
+ * Copyright (C) 2007 Apple Inc. All rights reserved.
+ * Copyright (C) 2006 Apple Computer, Inc. All rights reserved.
+ *
+ * This document is the property of Apple Inc.
+ * It is considered confidential and proprietary.
+ *
+ * This document may not be reproduced or transmitted in any form,
+ * in whole or in part, without the express written permission of
+ * Apple Inc.
+ */
+#include <arch.h>
+#include <debug.h>
+#include <sys.h>
+#include <sys/task.h>
+#include <lib/cbuf.h>
+
+#define DSCR_WDTR_FULL  (1L<<29)
+#define DSCR_RDTR_FULL  (1L<<30)
+
+#if ARM_DCC_SYNCHRONOUS
+static bool dcc_wait_tx = true;
+#else
+static bool dcc_wait_tx;
+#endif
+
+#ifndef DCC_TX_BUFFER_SIZE
+# define DCC_TX_BUFFER_SIZE 256
+#endif
+
+static struct cbuf *dcc_output_cbuf;
+
+extern u_int32_t read_dtr(void);
+extern void write_dtr(u_int32_t c);
+extern u_int32_t read_dscr(void);
+
+void arm_write_dcc_char(int c)
+{
+	if (dcc_wait_tx) {
+		while (read_dscr() & DSCR_WDTR_FULL);
+		write_dtr(c);
+	} else {
+		if (dcc_output_cbuf != 0)
+		   	cbuf_write_char(dcc_output_cbuf, c);
+	}
+}
+
+int arm_read_dcc_char(void)
+{
+	while (!(read_dscr() & DSCR_RDTR_FULL)); 
+
+	return read_dtr(); 
+}
+
+int arm_read_dcc_char_nowait(void)
+{
+	if (!(read_dscr() & DSCR_RDTR_FULL))
+		return -1;
+
+	return read_dtr();
+}
+
+static int dcc_read_task(void *arg)
+{
+	for(;;) {
+		int c;
+
+		c = arm_read_dcc_char_nowait();
+		if (c >= 0) {
+			if (c != '\r')
+				debug_pushchar(c);
+		}
+		task_sleep(1 * 1000);
+	}
+	return 0;
+}
+
+static int dcc_write_task(void *arg)
+{
+	for(;;) {
+		ssize_t ret;
+		char c;
+
+		ret = cbuf_read_char(dcc_output_cbuf, &c);
+		if (ret == 1) {
+   			while(read_dscr() & DSCR_WDTR_FULL)
+				 task_yield();
+		    write_dtr(c);
+		}
+		task_sleep(1 * 1000);
+	}
+	return 0;
+}
+
+int arm_dcc_init(void)
+{
+	if (arm_read_dcc_char_nowait() >= 0)
+	   	dcc_wait_tx = true;
+
+	if (!dcc_wait_tx) {
+		dcc_output_cbuf = cbuf_create(DCC_TX_BUFFER_SIZE, NULL);
+		task_start(task_create("dcc write", &dcc_write_task, NULL, 256));
+	}
+
+	task_start(task_create("dcc read", &dcc_read_task, NULL, 512));
+
+	return 0;
+}

arch/arm/dcc/rules.mk

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+# Copyright (C) 2007 Apple Inc. All rights reserved.
+#
+# This document is the property of Apple Inc.
+# It is considered confidential and proprietary.
+#
+# This document may not be reproduced or transmitted in any form,
+# in whole or in part, without the express written permission of
+# Apple Inc.
+#
+LOCAL_DIR := $(GET_LOCAL_DIR)
+
+OPTIONS += \
+	WITH_ARM_DCC=1
+
+MODULES	+= \
+	lib/cbuf
+
+ALL_OBJS += \
+	$(LOCAL_DIR)/dcc.o