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/*
* Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#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)
{
assert(dev_info != NULL);
*dev_info = (io_dev_info_t *)&sh_dev_info; /* cast away const */
return 0;
}
/* Open a file on the semi-hosting device */
static int sh_file_open(io_dev_info_t *dev_info __unused,
const uintptr_t spec, io_entity_t *entity)
{
int result = -ENOENT;
long sh_result;
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 = 0;
}
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)
{
long file_handle, sh_result;
assert(entity != NULL);
file_handle = (long)entity->info;
sh_result = semihosting_file_seek(file_handle, offset);
return (sh_result == 0) ? 0 : -ENOENT;
}
/* 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 = -ENOENT;
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 = 0;
*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 = -ENOENT;
long sh_result;
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 = 0;
}
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)
{
long sh_result;
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);
*length_written = length - bytes;
return (sh_result == 0) ? 0 : -ENOENT;
}
/* Close a file on the semi-hosting device */
static int sh_file_close(io_entity_t *entity)
{
long sh_result;
long file_handle;
assert(entity != NULL);
file_handle = (long)entity->info;
sh_result = semihosting_file_close(file_handle);
return (sh_result >= 0) ? 0 : -ENOENT;
}
/* 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;
assert(dev_con != NULL);
result = io_register_device(&sh_dev_info);
if (result == 0)
*dev_con = &sh_dev_connector;
return result;
}
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