c537d5958e
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29785 a1c6a512-1295-4272-9138-f99709370657
76 lines
2.9 KiB
C
76 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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* $Id$
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*
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* Copyright (C) 2006 Tomasz Malesinski
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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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#include "config.h"
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#include "codecs.h"
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struct codec_api *ci DATA_ATTR;
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extern unsigned char plugin_bss_start[];
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extern unsigned char plugin_end_addr[];
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extern enum codec_status codec_main(enum codec_entry_call_reason reason);
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/* stub, the entry point is called via its reference in __header to
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* avoid warning with certain compilers */
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int _start(void) {return 0;}
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enum codec_status codec_start(enum codec_entry_call_reason reason)
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{
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#if (CONFIG_PLATFORM & PLATFORM_NATIVE)
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if (reason == CODEC_LOAD)
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{
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#ifdef USE_IRAM
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extern char iramcopy[], iramstart[], iramend[], iedata[], iend[];
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size_t iram_size = iramend - iramstart;
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size_t ibss_size = iend - iedata;
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if (iram_size > 0 || ibss_size > 0)
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{
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ci->memcpy(iramstart, iramcopy, iram_size);
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ci->memset(iedata, 0, ibss_size);
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/* make the icache (if it exists) up to date with the new code */
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ci->cpucache_invalidate();
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/* barrier to prevent reordering iram copy and BSS clearing,
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* because the BSS segment alias the IRAM copy.
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*/
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asm volatile ("" ::: "memory");
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}
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#endif /* PLUGIN_USE_IRAM */
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ci->memset(plugin_bss_start, 0, plugin_end_addr - plugin_bss_start);
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/* Some parts of bss may be used via a no-cache alias (at least
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* portalplayer has this). If we don't clear the cache, those aliases
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* may read garbage */
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ci->cpucache_invalidate();
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}
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#endif /* CONFIG_PLATFORM */
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/* Note: If for any reason codec_main would not be called with CODEC_LOAD
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* because the above code failed then it must not be ever be called with
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* any other value and some strategy to avoid doing so must be conceived */
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return codec_main(reason);
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}
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#if defined(CPU_ARM) && (CONFIG_PLATFORM & PLATFORM_NATIVE)
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void __attribute__((naked)) __div0(void)
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{
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asm volatile("bx %0" : : "r"(ci->__div0));
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}
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#endif
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