diff options
Diffstat (limited to 'lib/cpus/aarch64/cortex_a75.S')
| -rw-r--r-- | lib/cpus/aarch64/cortex_a75.S | 44 |
1 files changed, 43 insertions, 1 deletions
diff --git a/lib/cpus/aarch64/cortex_a75.S b/lib/cpus/aarch64/cortex_a75.S index e66ad066..946f9884 100644 --- a/lib/cpus/aarch64/cortex_a75.S +++ b/lib/cpus/aarch64/cortex_a75.S @@ -1,5 +1,5 @@ /* - * Copyright (c) 2017, ARM Limited and Contributors. All rights reserved. + * Copyright (c) 2017-2018, ARM Limited and Contributors. All rights reserved. * * SPDX-License-Identifier: BSD-3-Clause */ @@ -151,6 +151,27 @@ func cortex_a75_reset_func ret endfunc cortex_a75_reset_func +func check_errata_cve_2017_5715 + mrs x0, id_aa64pfr0_el1 + ubfx x0, x0, #ID_AA64PFR0_CSV2_SHIFT, #ID_AA64PFR0_CSV2_LENGTH + /* + * If the field equals to 1 then branch targets trained in one + * context cannot affect speculative execution in a different context. + */ + cmp x0, #1 + beq 1f + +#if WORKAROUND_CVE_2017_5715 + mov x0, #ERRATA_APPLIES +#else + mov x0, #ERRATA_MISSING +#endif + ret +1: + mov x0, #ERRATA_NOT_APPLIES + ret +endfunc check_errata_cve_2017_5715 + /* --------------------------------------------- * HW will do the cache maintenance while powering down * --------------------------------------------- @@ -167,6 +188,27 @@ func cortex_a75_core_pwr_dwn ret endfunc cortex_a75_core_pwr_dwn +#if REPORT_ERRATA +/* + * Errata printing function for Cortex A75. Must follow AAPCS. + */ +func cortex_a75_errata_report + stp x8, x30, [sp, #-16]! + + bl cpu_get_rev_var + mov x8, x0 + + /* + * Report all errata. The revision-variant information is passed to + * checking functions of each errata. + */ + report_errata WORKAROUND_CVE_2017_5715, cortex_a75, cve_2017_5715 + + ldp x8, x30, [sp], #16 + ret +endfunc cortex_a75_errata_report +#endif + /* --------------------------------------------- * This function provides cortex_a75 specific * register information for crash reporting. |