diff options
Diffstat (limited to 'lib/cpus/aarch64/cpu_helpers.S')
| -rw-r--r-- | lib/cpus/aarch64/cpu_helpers.S | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/lib/cpus/aarch64/cpu_helpers.S b/lib/cpus/aarch64/cpu_helpers.S index de1177c3..808c7f80 100644 --- a/lib/cpus/aarch64/cpu_helpers.S +++ b/lib/cpus/aarch64/cpu_helpers.S @@ -227,6 +227,27 @@ func cpu_rev_var_hs ret endfunc cpu_rev_var_hs +/* + * Compare the CPU's revision-variant (x0) with a given range (x1 - x2), for errata + * application purposes. If the revision-variant is between or includes the given + * values, this indicates that errata applies; otherwise not. + * + * Shall clobber: x0-x4 + */ + .globl cpu_rev_var_range +func cpu_rev_var_range + mov x3, #ERRATA_APPLIES + mov x4, #ERRATA_NOT_APPLIES + cmp x0, x1 + csel x1, x3, x4, hs + cbz x1, 1f + cmp x0, x2 + csel x1, x3, x4, ls +1: + mov x0, x1 + ret +endfunc cpu_rev_var_range + #if REPORT_ERRATA /* * void print_errata_status(void); |