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Enable SRE_EL2 on ARM64

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Enable system register access for EL2. Alpine-V2 is
the first device requiring this to be enabled.
It is also in-sync with Linux initialization code,
and compatible with Alpine-V2 uboot requirements.

Obtained from:         Semihalf
Submitted by:          Michal Stanek <mst@semihalf.com>
Sponsored by:          Annapurna Labs
Approved by:           cognet (mentor)
Reviewed by:           wma
Differential revision: https://reviews.freebsd.org/D5394
This commit is contained in:
Wojciech Macek 2016-03-01 08:15:00 +00:00
parent 30d9287468
commit b2552c46b6
2 changed files with 2 additions and 0 deletions
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1
sys/arm64/arm64/locore.S
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@ -265,6 +265,7 @@ drop_to_el1:
mrs x2, icc_sre_el2
orr x2, x2, #ICC_SRE_EL2_EN /* Enable access from insecure EL1 */
orr x2, x2, #ICC_SRE_EL2_SRE /* Enable system registers */
msr icc_sre_el2, x2
2:

1
sys/arm64/include/armreg.h
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@ -131,6 +131,7 @@
#define ICC_SRE_EL1_SRE (1U << 0)
/* ICC_SRE_EL2 */
#define ICC_SRE_EL2_SRE (1U << 0)
#define ICC_SRE_EL2_EN (1U << 3)
/* ID_AA64DFR0_EL1 */