diff options
| -rw-r--r-- | docs/cpu-specific-build-macros.md | 3 | ||||
| -rw-r--r-- | include/lib/cpus/aarch64/cortex_a57.h | 1 | ||||
| -rw-r--r-- | lib/cpus/aarch64/cortex_a57.S | 32 | ||||
| -rw-r--r-- | lib/cpus/cpu-ops.mk | 8 |
4 files changed, 44 insertions, 0 deletions
diff --git a/docs/cpu-specific-build-macros.md b/docs/cpu-specific-build-macros.md index 5d34409f..94d05d57 100644 --- a/docs/cpu-specific-build-macros.md +++ b/docs/cpu-specific-build-macros.md @@ -66,6 +66,9 @@ For Cortex-A57, following errata build flags are defined : * `ERRATA_A57_828024`: This applies errata 828024 workaround to Cortex-A57 CPU. This needs to be enabled only for revision <= r1p1 of the CPU. +* `ERRATA_A57_829520`: This applies errata 829520 workaround to Cortex-A57 + CPU. This needs to be enabled only for revision <= r1p2 of the CPU. + 3. CPU Specific optimizations ------------------------------ diff --git a/include/lib/cpus/aarch64/cortex_a57.h b/include/lib/cpus/aarch64/cortex_a57.h index 68d0821c..95c1f56c 100644 --- a/include/lib/cpus/aarch64/cortex_a57.h +++ b/include/lib/cpus/aarch64/cortex_a57.h @@ -67,6 +67,7 @@ #define CPUACTLR_DCC_AS_DCCI (1 << 44) #define CPUACTLR_DIS_STREAMING (3 << 27) #define CPUACTLR_DIS_L1_STREAMING (3 << 25) +#define CPUACTLR_DIS_INDIRECT_PREDICTOR (1 << 4) /******************************************************************************* * L2 Control register specific definitions. diff --git a/lib/cpus/aarch64/cortex_a57.S b/lib/cpus/aarch64/cortex_a57.S index ec32ce78..25def1cd 100644 --- a/lib/cpus/aarch64/cortex_a57.S +++ b/lib/cpus/aarch64/cortex_a57.S @@ -225,6 +225,32 @@ apply_828024: ret endfunc errata_a57_828024_wa + /* --------------------------------------------------- + * Errata Workaround for Cortex A57 Errata #829520. + * This applies only to revision <= r1p2 of Cortex A57. + * Inputs: + * x0: variant[4:7] and revision[0:3] of current cpu. + * Clobbers : x0 - x5 + * --------------------------------------------------- + */ +func errata_a57_829520_wa + /* + * Compare x0 against revision r1p2 + */ + cmp x0, #0x12 + b.ls apply_829520 +#if LOG_LEVEL >= LOG_LEVEL_VERBOSE + b print_revision_warning +#else + ret +#endif +apply_829520: + mrs x1, CPUACTLR_EL1 + orr x1, x1, #CPUACTLR_DIS_INDIRECT_PREDICTOR + msr CPUACTLR_EL1, x1 + ret +endfunc errata_a57_829520_wa + /* ------------------------------------------------- * The CPU Ops reset function for Cortex-A57. * Clobbers: x0-x5, x15, x19, x30 @@ -267,6 +293,12 @@ func cortex_a57_reset_func mov x0, x15 bl errata_a57_828024_wa #endif + +#if ERRATA_A57_829520 + mov x0, x15 + bl errata_a57_829520_wa +#endif + /* --------------------------------------------- * Enable the SMP bit. * --------------------------------------------- diff --git a/lib/cpus/cpu-ops.mk b/lib/cpus/cpu-ops.mk index 7d9f2b72..62de70f5 100644 --- a/lib/cpus/cpu-ops.mk +++ b/lib/cpus/cpu-ops.mk @@ -82,6 +82,10 @@ ERRATA_A57_826974 ?=0 # only to revision <= r1p1 of the Cortex A57 cpu. ERRATA_A57_828024 ?=0 +# Flag to apply erratum 829520 workaround during reset. This erratum applies +# only to revision <= r1p2 of the Cortex A57 cpu. +ERRATA_A57_829520 ?=0 + # Process ERRATA_A53_826319 flag $(eval $(call assert_boolean,ERRATA_A53_826319)) $(eval $(call add_define,ERRATA_A53_826319)) @@ -105,3 +109,7 @@ $(eval $(call add_define,ERRATA_A57_826974)) # Process ERRATA_A57_828024 flag $(eval $(call assert_boolean,ERRATA_A57_828024)) $(eval $(call add_define,ERRATA_A57_828024)) + +# Process ERRATA_A57_829520 flag +$(eval $(call assert_boolean,ERRATA_A57_829520)) +$(eval $(call add_define,ERRATA_A57_829520)) |