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Buffering should align itself and not rely on buffering_reset parameters when storage alignment matters so that wrapped reads maintain alignment.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@29258 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Michael Sevakis 2011-02-09 09:30:09 +00:00
parent 19ea72ff63
commit 0d902c8c54
2 changed files with 8 additions and 0 deletions
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5
apps/buffering.c
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@ -1572,6 +1572,11 @@ void buffering_init(void)
/* Initialise the buffering subsystem */
bool buffering_reset(char *buf, size_t buflen)
{
/* Wraps of storage-aligned data must also be storage aligned,
thus buf and buflen must be a aligned to an integer multiple of
the storage alignment */
STORAGE_ALIGN_BUFFER(buf, buflen);
if (!buf || !buflen)
return false;

3
firmware/export/system.h
View file

@ -388,11 +388,14 @@ static inline void cpucache_flush(void)
#define STORAGE_PAD(x) ((x) + CACHEALIGN_SIZE - 1)
/* Number of bytes in the last cacheline assuming buffer of size x is aligned */
#define STORAGE_OVERLAP(x) ((x) & (CACHEALIGN_SIZE - 1))
#define STORAGE_ALIGN_BUFFER(start, size) \
ALIGN_BUFFER((start), (size), CACHEALIGN_SIZE)
#else
#define STORAGE_ALIGN_ATTR
#define STORAGE_ALIGN_DOWN(x) (x)
#define STORAGE_PAD(x) (x)
#define STORAGE_OVERLAP(x) 0
#define STORAGE_ALIGN_BUFFER(start, size)
#endif
/* Double-cast to avoid 'dereferencing type-punned pointer will