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Extend lc_open() to also being able to load overlay plugins.

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For this it needs to look at the plugin header. Since lc_open() doesn't know
it's a plugin, the header needs to be changed slightly to include the new lc_header (which needs to be the first element in plugin_header so it can be casted savely).

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@28054 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Thomas Martitz 2010-09-09 16:17:21 +00:00
parent cec7c99613
commit 0d4585b28f
10 changed files with 167 additions and 105 deletions
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28
apps/codecs/codec_crt0.c
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@ -20,15 +20,10 @@
****************************************************************************/
#include "config.h"
#include "codeclib.h"
#include "codecs.h"
struct codec_api *ci DATA_ATTR;
extern unsigned char iramcopy[];
extern unsigned char iramstart[];
extern unsigned char iramend[];
extern unsigned char iedata[];
extern unsigned char iend[];
extern unsigned char plugin_bss_start[];
extern unsigned char plugin_end_addr[];
@ -42,14 +37,23 @@ enum codec_status codec_start(void)
{
#if (CONFIG_PLATFORM & PLATFORM_NATIVE)
#ifdef USE_IRAM
ci->memcpy(iramstart, iramcopy, iramend - iramstart);
ci->memset(iedata, 0, iend - iedata);
#endif
extern char iramcopy[], iramstart[], iramend[], iedata[], iend[];
size_t iram_size = iramend - iramstart;
size_t ibss_size = iend - iedata;
if (iram_size > 0 || ibss_size > 0)
{
ci->memcpy(iramstart, iramcopy, iram_size);
ci->memset(iedata, 0, ibss_size);
/* make the icache (if it exists) up to date with the new code */
ci->cpucache_invalidate();
/* barrier to prevent reordering iram copy and BSS clearing,
* because the BSS segment alias the IRAM copy.
*/
asm volatile ("" ::: "memory");
}
#endif /* PLUGIN_USE_IRAM */
ci->memset(plugin_bss_start, 0, plugin_end_addr - plugin_bss_start);
#endif
/* writeback cleared iedata and bss areas, invalidate icache for
* copied code */
ci->cpucache_invalidate();
return codec_main();
}