Commit ef939f30 authored by Mark Brown's avatar Mark Brown Committed by Catalin Marinas
Browse files

kselftest/arm64: Add hwcap test for RNG 



Validate the RNG hwcap and make sure we don't generate a SIGILL reading
RNDR when it is reported.

Signed-off-by: default avatarMark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220913141101.151400-4-broonie@kernel.org


Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 859a9d51

tools/testing/selftests/arm64/abi/hwcap.c

+12 −0
Original line number Diff line number Diff line
@@ -33,6 +33,11 @@ 
 */

typedef void (*sigill_fn)(void);



static void rng_sigill(void)

{

	asm volatile("mrs x0, S3_3_C2_C4_0" : : : "x0");

}



static void sme_sigill(void)

{

	/* RDSVL x0, #0 */
@@ -113,6 +118,13 @@ static const struct hwcap_data { 
	sigill_fn sigill_fn;

	bool sigill_reliable;

} hwcaps[] = {

	{

		.name = "RNG",

		.at_hwcap = AT_HWCAP2,

		.hwcap_bit = HWCAP2_RNG,

		.cpuinfo = "rng",

		.sigill_fn = rng_sigill,

	},

	{

		.name = "SME",

		.at_hwcap = AT_HWCAP2,