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refactor(cpufeat): decouple FGT feature detection and build flags

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Split the feature check for FEAT_FGT into two parts:
- A boolean function that just evaluates whether the feature is usable.
  This takes build time flags into account, and only evaluates the CPU
  feature ID registers when the flexible FEAT_STATE_CHECK method is
  used.
- A "raw" function that returns the unfiltered CPU feature ID register.

Change the callers where needed, to give them the version they actually
want.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Change-Id: I9a041132d280451f5d9f653a62904f603b2a916d
This commit is contained in:
Andre Przywara 2022-11-10 14:28:01 +00:00
parent b45dd74e3a
commit ce4859554c
3 changed files with 19 additions and 5 deletions
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2
lib/el3_runtime/aarch64/context_mgmt.c
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@ -359,7 +359,7 @@ static void setup_context_common(cpu_context_t *ctx, const entry_point_info_t *e
&& (GET_M32(ep->spsr) == MODE32_hyp))) {
scr_el3 |= SCR_HCE_BIT;
if (is_armv8_6_fgt_present()) {
if (is_feat_fgt_supported()) {
scr_el3 |= SCR_FGTEN_BIT;
}