diff options
| author | Petre-Ionut Tudor <petre-ionut.tudor@arm.com> | 2019-10-03 17:09:08 +0100 |
|---|---|---|
| committer | Petre-Ionut Tudor <petre-ionut.tudor@arm.com> | 2019-10-07 11:50:07 +0100 |
| commit | 2a7adf2567aa103ced4a9a9b3ef8344935716d25 (patch) | |
| tree | 5ce3f4cda4573251a7208f8c46f909bbd757d9b4 /include | |
| parent | cf9319f46a1dd17c842297a8aeb68059f6f3a06f (diff) | |
Explicitly disable the SPME bit in MDCR_EL3
Currently the MDCR_EL3 initialisation implicitly disables
MDCR_EL3.SPME by using mov_imm.
This patch makes the SPME bit more visible by explicitly
disabling it and documenting its use in different versions
of the architecture.
Signed-off-by: Petre-Ionut Tudor <petre-ionut.tudor@arm.com>
Change-Id: I221fdf314f01622f46ac5aa43388f59fa17a29b3
Diffstat (limited to 'include')
| -rw-r--r-- | include/arch/aarch64/el3_common_macros.S | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/include/arch/aarch64/el3_common_macros.S b/include/arch/aarch64/el3_common_macros.S index ee20d5b2..378e827c 100644 --- a/include/arch/aarch64/el3_common_macros.S +++ b/include/arch/aarch64/el3_common_macros.S @@ -113,11 +113,18 @@ * prohibited in Secure state. This bit is RES0 in versions of the * architecture earlier than ARMv8.5, setting it to 1 doesn't have any * effect on them. + * + * MDCR_EL3.SPME: Set to zero so that event counting by the programmable + * counters PMEVCNTR<n>_EL0 is prohibited in Secure state. If ARMv8.2 + * Debug is not implemented this bit does not have any effect on the + * counters unless there is support for the implementation defined + * authentication interface ExternalSecureNoninvasiveDebugEnabled(). * --------------------------------------------------------------------- */ mov_imm x0, ((MDCR_EL3_RESET_VAL | MDCR_SDD_BIT | \ MDCR_SPD32(MDCR_SPD32_DISABLE) | MDCR_SCCD_BIT) & \ - ~(MDCR_TDOSA_BIT | MDCR_TDA_BIT | MDCR_TPM_BIT)) + ~(MDCR_SPME_BIT | MDCR_TDOSA_BIT | MDCR_TDA_BIT | \ + MDCR_TPM_BIT)) msr mdcr_el3, x0 |