Flush icache on cpuinfo

Author: OFFTKP

src/cpuinfo.cpp

@@ -12,6 +12,7 @@
 #include <utility>
 #include <asm/hwcap.h>
 #include <sys/auxv.h>
+#include <sys/cachectl.h>
 #include <sys/mman.h>
 #include <sys/prctl.h>
 #include <sys/syscall.h>
@@ -620,6 +621,8 @@ bool CheckExtensionSigill(biscuit::RISCVExtension extension) {
     result = mprotect(memory, 4096, PROT_READ | PROT_EXEC);
     BISCUIT_ASSERT(result == 0);
 
+   __riscv_flush_icache(reinterpret_cast<void*>(function), as.GetCursorPointer(), 0);
+
     bool has_extension = function(&valid_memory);
 
     result = munmap(memory, 4096);