diff options
| -rw-r--r-- | src/include/fw_config.h | 20 | ||||
| -rw-r--r-- | src/lib/fw_config.c | 15 |
2 files changed, 35 insertions, 0 deletions
diff --git a/src/include/fw_config.h b/src/include/fw_config.h index 7a8ad30482..04fdf98921 100644 --- a/src/include/fw_config.h +++ b/src/include/fw_config.h @@ -24,6 +24,11 @@ struct fw_config { uint64_t value; }; +struct fw_config_field { + const char *field_name; + uint64_t mask; +}; + /* Generate a pointer to a compound literal of the fw_config structure. */ #define FW_CONFIG(__field, __option) (&(const struct fw_config) { \ .field_name = FW_CONFIG_FIELD_##__field##_NAME, \ @@ -32,6 +37,11 @@ struct fw_config { .value = FW_CONFIG_FIELD_##__field##_OPTION_##__option##_VALUE \ }) +#define FW_CONFIG_FIELD(__field) (&(const struct fw_config_field) { \ + .field_name = FW_CONFIG_FIELD_##__field##_NAME, \ + .mask = FW_CONFIG_FIELD_##__field##_MASK, \ +}) + /** * fw_config_get() - Provide firmware configuration value. * @@ -42,6 +52,16 @@ uint64_t fw_config_get(void); #if CONFIG(FW_CONFIG) /** + * fw_config_get_field() - Provide firmware configuration field value. + * @field: Structure containing field name and mask + * + * Return 64bit firmware configuration value determined for the system. + * Will return UNDEFINED_FW_CONFIG if unprovisioned, caller should treat + * as error value for the case. + */ +uint64_t fw_config_get_field(const struct fw_config_field *field); + +/** * fw_config_probe() - Check if field and option matches. * @match: Structure containing field and option to probe. * diff --git a/src/lib/fw_config.c b/src/lib/fw_config.c index 72cf225cae..e1fbe74793 100644 --- a/src/lib/fw_config.c +++ b/src/lib/fw_config.c @@ -59,6 +59,21 @@ uint64_t fw_config_get(void) return fw_config_value; } +uint64_t fw_config_get_field(const struct fw_config_field *field) +{ + /* If fw_config is not provisioned, then there is nothing to get. */ + if (!fw_config_is_provisioned()) + return UNDEFINED_FW_CONFIG; + + int shift = __ffs64(field->mask); + const uint64_t value = (fw_config_get() & field->mask) >> shift; + + printk(BIOS_INFO, "fw_config get field name=%s, mask=0x%" PRIx64 ", shift=%d, value=0x%" + PRIx64 "\n", field->field_name, field->mask, shift, value); + + return value; +} + bool fw_config_probe(const struct fw_config *match) { /* If fw_config is not provisioned, then there is nothing to match. */ |