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feat(drtm): invalidate icache before DLME launch

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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
This commit is contained in:
Manish Pandey 2022-07-19 14:35:00 +01:00 • committed by Manish V Badarkhe
parent 764aa951b2
commit 2c265975a7
1 changed files with 11 additions and 2 deletions
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13
services/std_svc/drtm/drtm_main.c
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@ -136,6 +136,13 @@ int drtm_setup(void)
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 @@ static uint64_t drtm_dynamic_launch(uint64_t x1, void *handle)
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);