Re: [Patch] 1/3 Add new builtin __builtin_flush_icache().

[Thiemo Seufer <ths@networkno.de>]

Paolo Bonzini wrote:
>
>> The prototype for the new built-in is:
>> void __builtin_flush_icache(void *location, size_t len);
>> As one might expect, it flushes the region of memory pointed to by
>> location with length len from the instruction cache.  The
>> new builtin and the flush_icache insn would be the preferred mechanism
>> to flushing the i-cache.
>
> libgcc already exports __clear_cache with this prototype:
>
> void
> __clear_cache (char *beg __attribute__((__unused__)),
>                char *end __attribute__((__unused__)))

On MIPS{32,64}R2 an icache flush can be done inline with synci instructions.
Older revisions need a syscall.


Thiemo