feat(drtm): invalidate icache before DLME launch
As per DRTM beta0 spec table #28, Before the DLME is called the DCE
must invalidate all instruction caches.
Signed-off-by: Manish Pandey <manish.pandey2@arm.com>
Change-Id: I7efbb03d1d13346a8d898882fdbd7bbe8f1d49b2
diff --git a/services/std_svc/drtm/drtm_main.c b/services/std_svc/drtm/drtm_main.c
index 443516d..c98d829 100644
--- a/services/std_svc/drtm/drtm_main.c
+++ b/services/std_svc/drtm/drtm_main.c
@@ -136,6 +136,13 @@
return 0;
}
+static inline void invalidate_icache_all(void)
+{
+ __asm__ volatile("ic ialluis");
+ dsb();
+ isb();
+}
+
static inline uint64_t drtm_features_tpm(void *ctx)
{
SMC_RET2(ctx, 1ULL, /* TPM feature is supported */
@@ -629,9 +636,11 @@
drtm_dl_prepare_eret_to_dlme(&args, dlme_el);
/*
- * TODO: invalidate the instruction cache before jumping to the DLME.
- * This is required to defend against potentially-malicious cache contents.
+ * As per DRTM beta0 spec table #28 invalidate the instruction cache
+ * before jumping to the DLME. This is required to defend against
+ * potentially-malicious cache contents.
*/
+ invalidate_icache_all();
/* Return the DLME region's address in x0, and the DLME data offset in x1.*/
SMC_RET2(handle, args.dlme_paddr, args.dlme_data_off);