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author | Sean Bartell <wingedtachikoma@gmail.com> | 2011-06-25 21:32:25 -0400 |
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committer | Nils Wallménius <nils@rockbox.org> | 2012-04-25 22:13:20 +0200 |
commit | f40bfc9267b13b54e6379dfe7539447662879d24 (patch) | |
tree | 9b20069d5e62809ff434061ad730096836f916f2 /lib/rbcodec/codecs/codec_crt0.c | |
parent | a0009907de7a0107d49040d8a180f140e2eff299 (diff) | |
download | rockbox-f40bfc9267b13b54e6379dfe7539447662879d24.tar.gz rockbox-f40bfc9267b13b54e6379dfe7539447662879d24.zip |
Add codecs to librbcodec.
Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97
Reviewed-on: http://gerrit.rockbox.org/137
Reviewed-by: Nils Wallménius <nils@rockbox.org>
Tested-by: Nils Wallménius <nils@rockbox.org>
Diffstat (limited to 'lib/rbcodec/codecs/codec_crt0.c')
-rw-r--r-- | lib/rbcodec/codecs/codec_crt0.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/codec_crt0.c b/lib/rbcodec/codecs/codec_crt0.c new file mode 100644 index 0000000000..e3c3321e54 --- /dev/null +++ b/lib/rbcodec/codecs/codec_crt0.c | |||
@@ -0,0 +1,74 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Copyright (C) 2006 Tomasz Malesinski | ||
11 | * | ||
12 | * This program is free software; you can redistribute it and/or | ||
13 | * modify it under the terms of the GNU General Public License | ||
14 | * as published by the Free Software Foundation; either version 2 | ||
15 | * of the License, or (at your option) any later version. | ||
16 | * | ||
17 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
18 | * KIND, either express or implied. | ||
19 | * | ||
20 | ****************************************************************************/ | ||
21 | |||
22 | #include "config.h" | ||
23 | #include "codecs.h" | ||
24 | |||
25 | struct codec_api *ci DATA_ATTR; | ||
26 | |||
27 | extern unsigned char plugin_bss_start[]; | ||
28 | extern unsigned char plugin_end_addr[]; | ||
29 | |||
30 | /* stub, the entry point is called via its reference in __header to | ||
31 | * avoid warning with certain compilers */ | ||
32 | int _start(void) {return 0;} | ||
33 | |||
34 | enum codec_status codec_start(enum codec_entry_call_reason reason) | ||
35 | { | ||
36 | #if (CONFIG_PLATFORM & PLATFORM_NATIVE) | ||
37 | if (reason == CODEC_LOAD) | ||
38 | { | ||
39 | #ifdef USE_IRAM | ||
40 | extern char iramcopy[], iramstart[], iramend[], iedata[], iend[]; | ||
41 | size_t iram_size = iramend - iramstart; | ||
42 | size_t ibss_size = iend - iedata; | ||
43 | if (iram_size > 0 || ibss_size > 0) | ||
44 | { | ||
45 | ci->memcpy(iramstart, iramcopy, iram_size); | ||
46 | ci->memset(iedata, 0, ibss_size); | ||
47 | /* make the icache (if it exists) up to date with the new code */ | ||
48 | ci->commit_discard_idcache(); | ||
49 | /* barrier to prevent reordering iram copy and BSS clearing, | ||
50 | * because the BSS segment alias the IRAM copy. | ||
51 | */ | ||
52 | asm volatile ("" ::: "memory"); | ||
53 | } | ||
54 | #endif /* PLUGIN_USE_IRAM */ | ||
55 | ci->memset(plugin_bss_start, 0, plugin_end_addr - plugin_bss_start); | ||
56 | /* Some parts of bss may be used via a no-cache alias (at least | ||
57 | * portalplayer has this). If we don't clear the cache, those aliases | ||
58 | * may read garbage */ | ||
59 | ci->commit_dcache(); | ||
60 | } | ||
61 | #endif /* CONFIG_PLATFORM */ | ||
62 | |||
63 | /* Note: If for any reason codec_main would not be called with CODEC_LOAD | ||
64 | * because the above code failed then it must not be ever be called with | ||
65 | * any other value and some strategy to avoid doing so must be conceived */ | ||
66 | return codec_main(reason); | ||
67 | } | ||
68 | |||
69 | #if defined(CPU_ARM) && (CONFIG_PLATFORM & PLATFORM_NATIVE) | ||
70 | void __attribute__((naked)) __div0(void) | ||
71 | { | ||
72 | asm volatile("bx %0" : : "r"(ci->__div0)); | ||
73 | } | ||
74 | #endif | ||