const S390CPUDef *s390_find_cpu_def(uint16_t type, uint8_t gen, uint8_t ec_ga,
S390FeatBitmap features)
{
const S390CPUDef *last_compatible = NULL;
const S390CPUDef *matching_cpu_type = NULL;
int i;
if (!gen) {
ec_ga = 0;
}
if (!gen && type) {
gen = s390_get_gen_for_cpu_type(type);
}
for (i = 0; i < ARRAY_SIZE(s390_cpu_defs); i++) {
const S390CPUDef *def = &s390_cpu_defs[i];
S390FeatBitmap missing;
/* don't even try newer generations if we know the generation */
if (gen) {
if (def->gen > gen) {
break;
} else if (def->gen == gen && ec_ga && def->ec_ga > ec_ga) {
break;
}
}
if (features) {
/* see if the model satisfies the minimum features */
bitmap_andnot(missing, def->base_feat, features, S390_FEAT_MAX);
/*
* Ignore certain features that are in the base model, but not
* relevant for the search (esp. MSA subfunctions).
*/
bitmap_andnot(missing, missing, ignored_base_feat, S390_FEAT_MAX);
if (!bitmap_empty(missing, S390_FEAT_MAX)) {
break;
}
}
/* stop the search if we found the exact model */
if (def->type == type && def->ec_ga == ec_ga) {
return def;
}
/* remember if we've at least seen one with the same cpu type */
if (def->type == type) {
matching_cpu_type = def;
}
last_compatible = def;
}
/* prefer the model with the same cpu type, esp. don't take the BC for EC */
if (matching_cpu_type) {
return matching_cpu_type;
}
return last_compatible;
}
const S390CPUDef *s390_find_cpu_def(uint16_t type, uint8_t gen, uint8_t ec_ga,
S390FeatBitmap features)
{
const S390CPUDef *last_compatible = NULL;
int i;
if (!gen) {
ec_ga = 0;
}
if (!gen && type) {
gen = s390_get_gen_for_cpu_type(type);
}
for (i = 0; i < ARRAY_SIZE(s390_cpu_defs); i++) {
const S390CPUDef *def = &s390_cpu_defs[i];
S390FeatBitmap missing;
/* don't even try newer generations if we know the generation */
if (gen) {
if (def->gen > gen) {
break;
} else if (def->gen == gen && ec_ga && def->ec_ga > ec_ga) {
break;
}
}
if (features) {
/* see if the model satisfies the minimum features */
bitmap_andnot(missing, def->base_feat, features, S390_FEAT_MAX);
if (!bitmap_empty(missing, S390_FEAT_MAX)) {
break;
}
}
/* stop the search if we found the exact model */
if (def->type == type && def->ec_ga == ec_ga) {
return def;
}
last_compatible = def;
}
return last_compatible;
}
