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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:13:47 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-28 09:13:47 +0000 |
commit | 102b0d2daa97dae68d3eed54d8fe37a9cc38a892 (patch) | |
tree | bcf648efac40ca6139842707f0eba5a4496a6dd2 /lib/extensions/brbe/brbe.c | |
parent | Initial commit. (diff) | |
download | arm-trusted-firmware-upstream.tar.xz arm-trusted-firmware-upstream.zip |
Adding upstream version 2.8.0+dfsg.upstream/2.8.0+dfsgupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'lib/extensions/brbe/brbe.c')
-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); + } +} |