forked from len0rd/rockbox
a2cc7546d8
same vein as bootdata but for devices that need to pass info back to a running firmware Change-Id: I0cdcdc0475804dfbbee415ab487104ae8fc8ac69
94 lines
2.9 KiB
C
94 lines
2.9 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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*
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* Copyright (C) 2017 by Amaury Pouly
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#ifndef __RB_DEVICEDATA__
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#define __RB_DEVICEDATA__
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#ifndef __ASSEMBLER__
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#include <stdint.h>
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#include "system.h"
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#endif
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/* /!\ This file can be included in assembly files /!\ */
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/** The device data will be filled by the bootloader with information that might
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* be relevant for Rockbox. The bootloader will search for the structure using
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* the magic header within the first DEVICE_DATA_SEARCH_SIZE bytes of the binary.
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* Typically, this structure should be as close as possible to the entry point */
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/* Search size for the data structure after entry point */
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#define DEVICE_DATA_SEARCH_SIZE 1024
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#define DEVICE_DATA_MAGIC0 ('r' | 'b' << 8 | 'd' << 16 | 'e' << 24)
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#define DEVICE_DATA_MAGIC1 ('v' | 'i' << 8 | 'c' << 16 | 'e' << 24)
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/* maximum size of payload */
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#define DEVICE_DATA_PAYLOAD_SIZE 4
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#ifndef __ASSEMBLER__
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/* This is the C structure */
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struct device_data_t
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{
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union
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{
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uint32_t crc; /* crc of payload data (CRC32 with 0xffffffff for initial value) */
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uint32_t magic[2]; /* DEVICE_DATA_MAGIC0/1 */
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};
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uint32_t length; /* length of the payload */
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/* add fields here */
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union
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{
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struct
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{
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#if defined(EROS_QN)
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uint8_t lcd_version;
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#endif
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};
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uint8_t payload[DEVICE_DATA_PAYLOAD_SIZE];
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};
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} __attribute__((packed));
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void fill_devicedata(struct device_data_t *data);
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bool write_devicedata(unsigned char* buf, int len);
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#ifndef BOOTLOADER
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extern struct device_data_t device_data;
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void verify_device_data(void) INIT_ATTR;
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#endif
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#else /* __ASSEMBLER__ */
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/* This assembler macro implements an empty device data structure with just the magic
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* string and payload size */
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.macro put_device_data_here
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.global device_data
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device_data:
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.word DEVICE_DATA_MAGIC0
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.word DEVICE_DATA_MAGIC1
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.word DEVICE_DATA_PAYLOAD_SIZE
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.space BOOT_DATA_PAYLOAD_SIZE, 0xff /* payload, initialised with value 0xff */
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.endm
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#endif
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#endif /* __RB_DEVICEDATA__ */
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