1 files changed, 241 insertions, 0 deletions
diff --git a/drivers/io/io_semihosting.c b/drivers/io/io_semihosting.c
new file mode 100644
index 0000000..3c92c6d
--- /dev/null
+++ b/drivers/io/io_semihosting.c
@@ -0,0 +1,241 @@
+/*
+ * Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ *
+ * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ *
+ * Neither the name of ARM nor the names of its contributors may be used
+ * to endorse or promote products derived from this software without specific
+ * prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <assert.h>
+#include <io_driver.h>
+#include <io_storage.h>
+#include <semihosting.h>
+
+
+
+/* Identify the device type as semihosting */
+static io_type_t device_type_sh(void)
+{
+	return IO_TYPE_SEMIHOSTING;
+}
+
+
+/* Semi-hosting functions, device info and handle */
+
+static int sh_dev_open(const uintptr_t dev_spec, io_dev_info_t **dev_info);
+static int sh_file_open(io_dev_info_t *dev_info, const uintptr_t spec,
+		io_entity_t *entity);
+static int sh_file_seek(io_entity_t *entity, int mode, ssize_t offset);
+static int sh_file_len(io_entity_t *entity, size_t *length);
+static int sh_file_read(io_entity_t *entity, uintptr_t buffer, size_t length,
+		size_t *length_read);
+static int sh_file_write(io_entity_t *entity, const uintptr_t buffer,
+		size_t length, size_t *length_written);
+static int sh_file_close(io_entity_t *entity);
+
+static const io_dev_connector_t sh_dev_connector = {
+	.dev_open = sh_dev_open
+};
+
+
+static const io_dev_funcs_t sh_dev_funcs = {
+	.type = device_type_sh,
+	.open = sh_file_open,
+	.seek = sh_file_seek,
+	.size = sh_file_len,
+	.read = sh_file_read,
+	.write = sh_file_write,
+	.close = sh_file_close,
+	.dev_init = NULL,	/* NOP */
+	.dev_close = NULL,	/* NOP */
+};
+
+
+/* No state associated with this device so structure can be const */
+static const io_dev_info_t sh_dev_info = {
+	.funcs = &sh_dev_funcs,
+	.info = (uintptr_t)NULL
+};
+
+
+/* Open a connection to the semi-hosting device */
+static int sh_dev_open(const uintptr_t dev_spec __unused,
+		io_dev_info_t **dev_info)
+{
+	int result = IO_SUCCESS;
+	assert(dev_info != NULL);
+	*dev_info = (io_dev_info_t *)&sh_dev_info; /* cast away const */
+	return result;
+}
+
+
+/* Open a file on the semi-hosting device */
+static int sh_file_open(io_dev_info_t *dev_info __attribute__((unused)),
+		const uintptr_t spec, io_entity_t *entity)
+{
+	int result = IO_FAIL;
+	long sh_result = -1;
+	const io_file_spec_t *file_spec = (const io_file_spec_t *)spec;
+
+	assert(file_spec != NULL);
+	assert(entity != NULL);
+
+	sh_result = semihosting_file_open(file_spec->path, file_spec->mode);
+
+	if (sh_result > 0) {
+		entity->info = (uintptr_t)sh_result;
+		result = IO_SUCCESS;
+	} else {
+		result = IO_FAIL;
+	}
+	return result;
+}
+
+
+/* Seek to a particular file offset on the semi-hosting device */
+static int sh_file_seek(io_entity_t *entity, int mode, ssize_t offset)
+{
+	int result = IO_FAIL;
+	long file_handle, sh_result;
+
+	assert(entity != NULL);
+
+	file_handle = (long)entity->info;
+
+	sh_result = semihosting_file_seek(file_handle, offset);
+
+	result = (sh_result == 0) ? IO_SUCCESS : IO_FAIL;
+
+	return result;
+}
+
+
+/* Return the size of a file on the semi-hosting device */
+static int sh_file_len(io_entity_t *entity, size_t *length)
+{
+	int result = IO_FAIL;
+
+	assert(entity != NULL);
+	assert(length != NULL);
+
+	long sh_handle = (long)entity->info;
+	long sh_result = semihosting_file_length(sh_handle);
+
+	if (sh_result >= 0) {
+		result = IO_SUCCESS;
+		*length = (size_t)sh_result;
+	}
+
+	return result;
+}
+
+
+/* Read data from a file on the semi-hosting device */
+static int sh_file_read(io_entity_t *entity, uintptr_t buffer, size_t length,
+		size_t *length_read)
+{
+	int result = IO_FAIL;
+	long sh_result = -1;
+	size_t bytes = length;
+	long file_handle;
+
+	assert(entity != NULL);
+	assert(buffer != (uintptr_t)NULL);
+	assert(length_read != NULL);
+
+	file_handle = (long)entity->info;
+
+	sh_result = semihosting_file_read(file_handle, &bytes, buffer);
+
+	if (sh_result >= 0) {
+		*length_read = (bytes != length) ? bytes : length;
+		result = IO_SUCCESS;
+	} else
+		result = IO_FAIL;
+
+	return result;
+}
+
+
+/* Write data to a file on the semi-hosting device */
+static int sh_file_write(io_entity_t *entity, const uintptr_t buffer,
+		size_t length, size_t *length_written)
+{
+	int result = IO_FAIL;
+	long sh_result = -1;
+	long file_handle;
+	size_t bytes = length;
+
+	assert(entity != NULL);
+	assert(buffer != (uintptr_t)NULL);
+	assert(length_written != NULL);
+
+	file_handle = (long)entity->info;
+
+	sh_result = semihosting_file_write(file_handle, &bytes, buffer);
+
+	if (sh_result >= 0) {
+		*length_written = sh_result;
+		result = IO_SUCCESS;
+	} else
+		result = IO_FAIL;
+
+	return result;
+}
+
+
+/* Close a file on the semi-hosting device */
+static int sh_file_close(io_entity_t *entity)
+{
+	int result = IO_FAIL;
+	long sh_result = -1;
+	long file_handle;
+
+	assert(entity != NULL);
+
+	file_handle = (long)entity->info;
+
+	sh_result = semihosting_file_close(file_handle);
+
+	result = (sh_result >= 0) ? IO_SUCCESS : IO_FAIL;
+
+	return result;
+}
+
+
+/* Exported functions */
+
+/* Register the semi-hosting driver with the IO abstraction */
+int register_io_dev_sh(const io_dev_connector_t **dev_con)
+{
+	int result = IO_FAIL;
+	assert(dev_con != NULL);
+
+	result = io_register_device(&sh_dev_info);
+	if (result == IO_SUCCESS)
+		*dev_con = &sh_dev_connector;
+
+	return result;
+}