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Diffstat (limited to '')
-rw-r--r-- | lib/extensions/brbe/brbe.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/lib/extensions/brbe/brbe.c b/lib/extensions/brbe/brbe.c new file mode 100644 index 0000000..1982619 --- /dev/null +++ b/lib/extensions/brbe/brbe.c @@ -0,0 +1,27 @@ +/* + * Copyright (c) 2022, Arm Limited. All rights reserved. + * + * SPDX-License-Identifier: BSD-3-Clause + */ + +#include <arch.h> +#include <arch_features.h> +#include <arch_helpers.h> + +void brbe_enable(void) +{ + uint64_t val; + + if (is_feat_brbe_present()) { + /* + * MDCR_EL3.SBRBE = 0b01 + * + * Allows BRBE usage in non-secure world and prohibited in + * secure world. + */ + val = read_mdcr_el3(); + val &= ~(MDCR_SBRBE_MASK << MDCR_SBRBE_SHIFT); + val |= (0x1UL << MDCR_SBRBE_SHIFT); + write_mdcr_el3(val); + } +} |