feat(cpus): make revision procedure call optional
For runtime errata, we should avoid generating calls to
`cpu_get_rev_var` unless its necessary. Make the path that generates
this call parameterized, and cache the result in a temporary register to
allow future calls that go down the alternate path to retrieve the cache
CPU revision.
Change-Id: I9882ede76568fbd9a7ccd4caa74eff0c66a7b20e
Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
diff --git a/include/lib/cpus/errata.h b/include/lib/cpus/errata.h
index b280435..2080898 100644
--- a/include/lib/cpus/errata.h
+++ b/include/lib/cpus/errata.h
@@ -66,6 +66,9 @@
#define NO_ASSERT 0
#define NO_APPLY_AT_RESET 0
#define APPLY_AT_RESET 1
+#define GET_CPU_REV 1
+#define NO_GET_CPU_REV 0
+
/* useful for errata that end up always being worked around */
#define ERRATUM_ALWAYS_CHOSEN 1