diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/lib/cpus/aarch64/cpu_macros.S | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/lib/cpus/aarch64/cpu_macros.S b/include/lib/cpus/aarch64/cpu_macros.S index ccf53066..6c3a5b99 100644 --- a/include/lib/cpus/aarch64/cpu_macros.S +++ b/include/lib/cpus/aarch64/cpu_macros.S @@ -229,3 +229,18 @@ CPU_OPS_SIZE = . #endif #endif /* __CPU_MACROS_S__ */ + + /* + * This macro is used on some CPUs to detect if they are vulnerable + * to CVE-2017-5715. + */ + .macro cpu_check_csv2 _reg _label + mrs \_reg, id_aa64pfr0_el1 + ubfx \_reg, \_reg, #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 \_reg, #1 + beq \_label + .endm |