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https://github.com/CTCaer/switch-l4t-atf.git
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625de1d4f0
Update code base to remove variables from the .data section, mainly by using const static data where possible and adding the const specifier as required. Most changes are to the IO subsystem, including the framework APIs. The FVP power management code is also affected. Delay initialization of the global static variable, next_image_type in bl31_main.c, until it is realy needed. Doing this moves the variable from the .data to the .bss section. Also review the IO interface for inconsistencies, using uintptr_t where possible instead of void *. Remove the io_handle and io_dev_handle typedefs, which were unnecessary, replacing instances with uintptr_t. Fixes ARM-software/tf-issues#107. Change-Id: I085a62197c82410b566e4698e5590063563ed304
125 lines
3.6 KiB
C
125 lines
3.6 KiB
C
/*
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* Copyright (c) 2014, ARM Limited and Contributors. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of ARM nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific
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* prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef __IO_H__
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#define __IO_H__
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#include <stdint.h>
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#include <stdio.h> /* For ssize_t */
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/* Device type which can be used to enable policy decisions about which device
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* to access */
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typedef enum {
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IO_TYPE_INVALID,
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IO_TYPE_SEMIHOSTING,
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IO_TYPE_MEMMAP,
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IO_TYPE_FIRMWARE_IMAGE_PACKAGE,
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IO_TYPE_MAX
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} io_type_t;
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/* Modes used when seeking data on a supported device */
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typedef enum {
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IO_SEEK_INVALID,
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IO_SEEK_SET,
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IO_SEEK_END,
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IO_SEEK_CUR,
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IO_SEEK_MAX
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} io_seek_mode_t;
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/* Connector type, providing a means of identifying a device to open */
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struct io_dev_connector;
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/* File specification - used to refer to data on a device supporting file-like
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* entities */
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typedef struct io_file_spec {
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const char *path;
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unsigned int mode;
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} io_file_spec_t;
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/* Block specification - used to refer to data on a device supporting
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* block-like entities */
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typedef struct io_block_spec {
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size_t offset;
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size_t length;
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} io_block_spec_t;
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/* Access modes used when accessing data on a device */
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#define IO_MODE_INVALID (0)
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#define IO_MODE_RO (1 << 0)
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#define IO_MODE_RW (1 << 1)
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/* Return codes reported by 'io_*' APIs */
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#define IO_SUCCESS (0)
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#define IO_FAIL (-1)
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#define IO_NOT_SUPPORTED (-2)
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#define IO_RESOURCES_EXHAUSTED (-3)
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/* Open a connection to a device */
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int io_dev_open(const struct io_dev_connector *dev_con,
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const uintptr_t dev_spec,
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uintptr_t *dev_handle);
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/* Initialise a device explicitly - to permit lazy initialisation or
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* re-initialisation */
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int io_dev_init(uintptr_t dev_handle, const uintptr_t init_params);
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/* TODO: Consider whether an explicit "shutdown" API should be included */
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/* Close a connection to a device */
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int io_dev_close(uintptr_t dev_handle);
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/* Synchronous operations */
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int io_open(uintptr_t dev_handle, const uintptr_t spec, uintptr_t *handle);
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int io_seek(uintptr_t handle, io_seek_mode_t mode, ssize_t offset);
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int io_size(uintptr_t handle, size_t *length);
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int io_read(uintptr_t handle, uintptr_t buffer, size_t length,
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size_t *length_read);
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int io_write(uintptr_t handle, const uintptr_t buffer, size_t length,
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size_t *length_written);
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int io_close(uintptr_t handle);
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#endif /* __IO_H__ */
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