Help me ... explain parameters of cacheflush() function

minhstone · 01-21-2008, 09:35 PM

hi all,
I want using cacheflush function but I don't understand parameter of it.
"NAME
cacheflush - flush contents of instruction and/or data cache

SYNOPSIS
#include <asm/cachectl.h>

int cacheflush(char *addr, int nbytes, int cache);

DESCRIPTION
cacheflush flushes contents of indicated cache(s) for user addresses in
the range addr to (addr+nbytes-1). Cache may be one of:

ICACHE Flush the instruction cache.

DCACHE Write back to memory and invalidate the affected valid cache
lines.

BCACHE Same as (ICACHE|DCACHE).
"
I don't understand "char *addr" parameter, and how do use it.
Who can help me explain ? and show some examples about this function and usage it.
Thanks,

kaz2100 · 01-22-2008, 06:57 PM

Hya,

Um... I am kind of sure that you can write C program, (otherwise, it is impossible to use it.)

So, it should not be difficult, I guess.

But my penguin says:
The current implementation ignores the addr and nbytes arguments. Therefore, the whole cache is always flushed.

At this moment, I do not think you need "addr"

By the way, I am having difficulty understanding what you want.

http://www.linuxquestions.org/questi...memory-615084/

I appreciate if you can describe your goal a bit more detail.

Happy Penguins!

minhstone · 01-22-2008, 09:41 PM

Quote:

Originally Posted by kaz2100

Hya,

Um... I am kind of sure that you can write C program, (otherwise, it is impossible to use it.)

So, it should not be difficult, I guess.

But my penguin says:
The current implementation ignores the addr and nbytes arguments. Therefore, the whole cache is always flushed.

At this moment, I do not think you need "addr"

By the way, I am having difficulty understanding what you want.

http://www.linuxquestions.org/questi...memory-615084/

I appreciate if you can describe your goal a bit more detail.

Happy Penguins!

hi,
because I want ensure data cache erased before I continue implement transfer data blocks different to device.