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| author | lauwal01 <lauren.wehrmeister@arm.com> | 2019-06-24 11:44:58 -0500 |
|---|---|---|
| committer | lauwal01 <lauren.wehrmeister@arm.com> | 2019-07-02 09:16:54 -0500 |
| commit | 411f4959b45b7a072b567dadf33b110936f14f32 (patch) | |
| tree | 1ed19f9f44816e4c7fdaafb00457b5d51361e0d3 /lib/cpus | |
| parent | 335b3c79c79dcfc04e9776ce2e21c3b16aa6febf (diff) | |
Workaround for Neoverse N1 erratum 1262606
Neoverse N1 erratum 1262606 is a Cat B erratum [1],
present in older revisions of the Neoverse N1 processor core.
The workaround is to set a bit in the implementation defined
CPUACTLR_EL1 system register, which delays instruction fetch after
branch misprediction.
[1] http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.pjdoc-466751330-10325/index.html
Change-Id: Idd980e9d5310232d38f0ce272862e1fb0f02ce9a
Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
Diffstat (limited to 'lib/cpus')
| -rw-r--r-- | lib/cpus/aarch64/neoverse_n1.S | 33 | ||||
| -rw-r--r-- | lib/cpus/cpu-ops.mk | 8 |
2 files changed, 41 insertions, 0 deletions
diff --git a/lib/cpus/aarch64/neoverse_n1.S b/lib/cpus/aarch64/neoverse_n1.S index 19b21a57..60045757 100644 --- a/lib/cpus/aarch64/neoverse_n1.S +++ b/lib/cpus/aarch64/neoverse_n1.S @@ -239,6 +239,33 @@ func check_errata_1257314 endfunc check_errata_1257314 /* -------------------------------------------------- + * Errata Workaround for Neoverse N1 Errata #1262606 + * This applies to revision <=r3p0 of Neoverse N1. + * Inputs: + * x0: variant[4:7] and revision[0:3] of current cpu. + * Shall clobber: x0-x17 + * -------------------------------------------------- + */ +func errata_n1_1262606_wa + /* Compare x0 against revision r3p0 */ + mov x17, x30 + bl check_errata_1262606 + cbz x0, 1f + mrs x1, NEOVERSE_N1_CPUACTLR_EL1 + orr x1, x1, NEOVERSE_N1_CPUACTLR_EL1_BIT_13 + msr NEOVERSE_N1_CPUACTLR_EL1, x1 + isb +1: + ret x17 +endfunc errata_n1_1262606_wa + +func check_errata_1262606 + /* Applies to <=r3p0 */ + mov x1, #0x30 + b cpu_rev_var_ls +endfunc check_errata_1262606 + +/* -------------------------------------------------- * Errata Workaround for Neoverse N1 Erratum 1315703. * This applies to revision <= r3p0 of Neoverse N1. * Inputs: @@ -316,6 +343,11 @@ func neoverse_n1_reset_func bl errata_n1_1257314_wa #endif +#if ERRATA_N1_1262606 + mov x0, x18 + bl errata_n1_1262606_wa +#endif + #if ERRATA_N1_1315703 mov x0, x18 bl errata_n1_1315703_wa @@ -384,6 +416,7 @@ func neoverse_n1_errata_report report_errata ERRATA_N1_1207823, neoverse_n1, 1207823 report_errata ERRATA_N1_1220197, neoverse_n1, 1220197 report_errata ERRATA_N1_1257314, neoverse_n1, 1257314 + report_errata ERRATA_N1_1262606, neoverse_n1, 1262606 report_errata ERRATA_N1_1315703, neoverse_n1, 1315703 report_errata ERRATA_DSU_936184, neoverse_n1, dsu_936184 diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk index c4769d9e..befb45eb 100644 --- a/lib/cpus/cpu-ops.mk +++ b/lib/cpus/cpu-ops.mk @@ -262,6 +262,10 @@ ERRATA_N1_1220197 ?=0 # only to revision <= r3p0 of the Neoverse N1 cpu. ERRATA_N1_1257314 ?=0 +# Flag to apply erratum 1262606 workaround during reset. This erratum applies +# only to revision <= r3p0 of the Neoverse N1 cpu. +ERRATA_N1_1262606 ?=0 + # Flag to apply erratum 1315703 workaround during reset. This erratum applies # to revisions before r3p1 of the Neoverse N1 cpu. ERRATA_N1_1315703 ?=1 @@ -479,6 +483,10 @@ $(eval $(call add_define,ERRATA_N1_1220197)) $(eval $(call assert_boolean,ERRATA_N1_1257314)) $(eval $(call add_define,ERRATA_N1_1257314)) +# Process ERRATA_N1_1262606 flag +$(eval $(call assert_boolean,ERRATA_N1_1262606)) +$(eval $(call add_define,ERRATA_N1_1262606)) + # Process ERRATA_N1_1315703 flag $(eval $(call assert_boolean,ERRATA_N1_1315703)) $(eval $(call add_define,ERRATA_N1_1315703)) |