<libkern/OSCacheControl.h> describes sys_icache_invalidate() as
"equivalent to sys_cache_control(kCacheFunctionPrepareForExecution)",
having kCacheFunctionPrepareForExecution defined as:
/* Prepare memory for execution. This should be called
* after writing machine instructions to memory, before
* executing them. It syncs the dcache and icache. [...]
*/
Since the dcache is also sync'd, we can avoid the sys_dcache_flush()
call when both rx/rw pointers are equal.
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-Id: <
20230605195911.96033-1-philmd@linaro.org>
void flush_idcache_range(uintptr_t rx, uintptr_t rw, size_t len)
{
- sys_dcache_flush((void *)rw, len);
+ if (rx == rw) {
+ /*
+ * sys_icache_invalidate() syncs the dcache and icache,
+ * so no need to call sys_dcache_flush().
+ */
+ } else {
+ sys_dcache_flush((void *)rw, len);
+ }
sys_icache_invalidate((void *)rx, len);
}
#else