0cf4cab431
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24907 a1c6a512-1295-4272-9138-f99709370657
112 lines
3.6 KiB
C
112 lines
3.6 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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* $Id$
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*
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* Overlay loader
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*
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* Copyright (C) 2006 Jens Arnold
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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 SIMULATOR
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#include "plugin.h"
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#include "overlay.h"
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/* load and run a plugin linked as an overlay.
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arguments:
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parameter = plugin parameter, passed on to the overlay
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filename = overlay file name, absolute path as usual
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name = overlay display name
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result:
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return value from the overlay
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As long as a large plugin to be overlayed doesn't use the audiobuffer
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itself, no adjustments in the plugin source code are necessary to make
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it work as an overlay, it only needs an adapted linker script.
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If the overlayed plugin *does* use the audiobuffer itself, it needs
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to make sure not to overwrite itself.
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The linker script for the overlay should use a base address towards the
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end of the audiobuffer, just low enough to make the overlay fit. */
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enum plugin_status run_overlay(const void* parameter,
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unsigned char *filename, unsigned char *name)
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{
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int fd, readsize;
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ssize_t audiobuf_size;
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unsigned char *audiobuf;
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static struct plugin_header header;
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fd = rb->open(filename, O_RDONLY);
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if (fd < 0)
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{
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rb->splashf(2*HZ, "Can't open %s", filename);
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return PLUGIN_ERROR;
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}
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readsize = rb->read(fd, &header, sizeof(header));
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rb->close(fd);
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/* Close for now. Less code than doing it in all error checks.
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* Would need to seek back anyway. */
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if (readsize != sizeof(header))
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{
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rb->splashf(2*HZ, "Reading %s overlay failed.", name);
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return PLUGIN_ERROR;
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}
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if (header.magic != PLUGIN_MAGIC || header.target_id != TARGET_ID)
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{
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rb->splashf(2*HZ, "%s overlay: Incompatible model.", name);
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return PLUGIN_ERROR;
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}
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if (header.api_version != PLUGIN_API_VERSION)
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{
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rb->splashf(2*HZ, "%s overlay: Incompatible version.", name);
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return PLUGIN_ERROR;
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}
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audiobuf = rb->plugin_get_audio_buffer((size_t *)&audiobuf_size);
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if (header.load_addr < audiobuf ||
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header.end_addr > audiobuf + audiobuf_size)
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{
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rb->splashf(2*HZ, "%s overlay doesn't fit into memory.", name);
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return PLUGIN_ERROR;
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}
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fd = rb->open(filename, O_RDONLY);
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if (fd < 0)
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{
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rb->splashf(2*HZ, "Can't open %s", filename);
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return PLUGIN_ERROR;
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}
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readsize = rb->read(fd, header.load_addr, header.end_addr - header.load_addr);
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rb->close(fd);
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if (readsize < 0)
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{
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rb->splashf(2*HZ, "Reading %s overlay failed.", name);
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return PLUGIN_ERROR;
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}
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/* Zero out bss area */
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rb->memset(header.load_addr + readsize, 0,
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header.end_addr - (header.load_addr + readsize));
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*(header.api) = rb;
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return header.entry_point(parameter);
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}
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#endif
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