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/*
* Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#ifndef IO_STORAGE_H
#define IO_STORAGE_H
#include <errno.h>
#include <stdint.h>
#include <stdio.h> /* For ssize_t */
#include <uuid.h>
/* Device type which can be used to enable policy decisions about which device
* to access */
typedef enum {
IO_TYPE_INVALID,
IO_TYPE_SEMIHOSTING,
IO_TYPE_MEMMAP,
IO_TYPE_DUMMY,
IO_TYPE_FIRMWARE_IMAGE_PACKAGE,
IO_TYPE_BLOCK,
IO_TYPE_MMC,
IO_TYPE_STM32IMAGE,
IO_TYPE_MAX
} io_type_t;
/* Modes used when seeking data on a supported device */
typedef enum {
IO_SEEK_INVALID,
IO_SEEK_SET,
IO_SEEK_END,
IO_SEEK_CUR,
IO_SEEK_MAX
} io_seek_mode_t;
/* Connector type, providing a means of identifying a device to open */
struct io_dev_connector;
/* File specification - used to refer to data on a device supporting file-like
* entities */
typedef struct io_file_spec {
const char *path;
unsigned int mode;
} io_file_spec_t;
/* UUID specification - used to refer to data accessed using UUIDs (i.e. FIP
* images) */
typedef struct io_uuid_spec {
const uuid_t uuid;
} io_uuid_spec_t;
/* Block specification - used to refer to data on a device supporting
* block-like entities */
typedef struct io_block_spec {
size_t offset;
size_t length;
} io_block_spec_t;
/* Access modes used when accessing data on a device */
#define IO_MODE_INVALID (0)
#define IO_MODE_RO (1 << 0)
#define IO_MODE_RW (1 << 1)
/* Open a connection to a device */
int io_dev_open(const struct io_dev_connector *dev_con,
const uintptr_t dev_spec,
uintptr_t *handle);
/* Initialise a device explicitly - to permit lazy initialisation or
* re-initialisation */
int io_dev_init(uintptr_t dev_handle, const uintptr_t init_params);
/* TODO: Consider whether an explicit "shutdown" API should be included */
/* Close a connection to a device */
int io_dev_close(uintptr_t dev_handle);
/* Synchronous operations */
int io_open(uintptr_t dev_handle, const uintptr_t spec, uintptr_t *handle);
int io_seek(uintptr_t handle, io_seek_mode_t mode, ssize_t offset);
int io_size(uintptr_t handle, size_t *length);
int io_read(uintptr_t handle, uintptr_t buffer, size_t length,
size_t *length_read);
int io_write(uintptr_t handle, const uintptr_t buffer, size_t length,
size_t *length_written);
int io_close(uintptr_t handle);
#endif /* IO_STORAGE_H */