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kselftest/arm64: Add hwcap test for RNG

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

Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20220913141101.151400-4-broonie@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Brown 2022-09-13 15:11:01 +01:00 committed by Catalin Marinas
parent 859a9d51a2
commit ef939f3051
1 changed files with 12 additions and 0 deletions
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12
tools/testing/selftests/arm64/abi/hwcap.c
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@ -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,