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fix(cpus): workaround for Cortex-X2 erratum 1916945

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Cortex-X2 erratum 1916945 is a Cat B erratum that applies to
revisions r0p0 and r1p0 and is fixed in r2p0.

The workaround is to set CPUECTLR_EL1[8]. This has a small
performance impact (<0.5%).

SDEN documentation:
https://developer.arm.com/documentation/SDEN-1775100/latest

Change-Id: If810b1d0a07c43b3e1aa70d2ec88c1dcfa6f735f
Signed-off-by: John Powell <john.powell@arm.com>
This commit is contained in:
John Powell 2025-07-11 19:27:15 -05:00
parent ce64ea6ecb
commit ff879c5280
3 changed files with 14 additions and 0 deletions
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4
docs/design/cpu-specific-build-macros.rst
View File

@ -744,6 +744,10 @@ For Cortex-X2, the following errata build flags are defined :
- ``ERRATA_X2_1901946``: This applies errata 1901946 workaround to Cortex-X2
CPU. This needs to be enabled only for r1p0, it is fixed in r2p0.
- ``ERRATA_X2_1916945``: This applies errata 1916945 workaround to Cortex-X2
CPU. This needs to be enabled for revisions r0p0 and r1p0, it is fixed in
r2p0.
- ``ERRATA_X2_2002765``: This applies errata 2002765 workaround to Cortex-X2
CPU. This needs to be enabled for revisions r0p0, r1p0, and r2p0 of the CPU,
it is still open.

6
lib/cpus/aarch64/cortex_x2.S
View File

@ -37,6 +37,12 @@ workaround_reset_end cortex_x2, ERRATUM(1901946)
check_erratum_range cortex_x2, ERRATUM(1901946), CPU_REV(1, 0), CPU_REV(1, 0)
workaround_reset_start cortex_x2, ERRATUM(1916945), ERRATA_X2_1916945
sysreg_bit_set CORTEX_X2_CPUECTLR_EL1, BIT(8)
workaround_reset_end cortex_x2, ERRATUM(1916945)
check_erratum_ls cortex_x2, ERRATUM(1916945), CPU_REV(1, 0)
workaround_reset_start cortex_x2, ERRATUM(2002765), ERRATA_X2_2002765
ldr x0, =0x6
msr S3_6_C15_C8_0, x0 /* CPUPSELR_EL3 */

4
lib/cpus/cpu-ops.mk
View File

@ -746,6 +746,10 @@ CPU_FLAG_LIST += ERRATA_N3_3699563
# only to revision r1p0 of the Cortex-X2 cpu, it is fixed in r2p0.
CPU_FLAG_LIST += ERRATA_X2_1901946
# Flag to apply erratum 1916945 workaround during reset. This erratum applies
# to revisions r0p0 and r1p0 of the Cortex-X2 cpu, it is fixed in r2p0.
CPU_FLAG_LIST += ERRATA_X2_1916945
# Flag to apply erratum 2002765 workaround during reset. This erratum applies
# to revisions r0p0, r1p0, and r2p0 of the Cortex-X2 cpu and is still open.
CPU_FLAG_LIST += ERRATA_X2_2002765