diff options
Diffstat (limited to 'src/drivers/vpd/vpd_device_feature.c')
| -rw-r--r-- | src/drivers/vpd/vpd_device_feature.c | 37 |
1 files changed, 30 insertions, 7 deletions
diff --git a/src/drivers/vpd/vpd_device_feature.c b/src/drivers/vpd/vpd_device_feature.c index 1c8682ab7e..7b92756e54 100644 --- a/src/drivers/vpd/vpd_device_feature.c +++ b/src/drivers/vpd/vpd_device_feature.c @@ -1,15 +1,38 @@ /* SPDX-License-Identifier: GPL-2.0-only */ +#include <b64_decode.h> +#include <console/console.h> #include <drivers/vpd/vpd.h> +#include <stdlib.h> #define VPD_KEY_FEATURE_DEVICE_INFO "feature_device_info" -#define VPD_FEATURE_DEVICE_INFO_LEN 64 -const char *vpd_get_feature_device_info(void) +/* + * Extracts the "feature_level" from the "feature_device_info" VPD key. + * This key holds a base64-encoded protobuf where "feature_level" is the first entry. + */ +uint8_t vpd_get_feature_level(void) { - static char device_info[VPD_FEATURE_DEVICE_INFO_LEN]; - if (vpd_gets(VPD_KEY_FEATURE_DEVICE_INFO, device_info, VPD_FEATURE_DEVICE_INFO_LEN, - VPD_RW)) - return device_info; - return ""; + const uint8_t *device_info; + int device_info_size, feature_level = 0; + uint8_t *decoded_device_info; + size_t decoded_size; + + device_info = vpd_find(VPD_KEY_FEATURE_DEVICE_INFO, &device_info_size, VPD_RW); + if (!device_info) + return feature_level; + + decoded_size = B64_DECODED_SIZE(device_info_size); + decoded_device_info = malloc(decoded_size); + if (!decoded_device_info) { + printk(BIOS_ERR, "%s: failed allocating %zd bytes\n", __func__, decoded_size); + return feature_level; + } + + /* The index 1 of the decoded data is the "feature level" value */ + if (b64_decode(device_info, device_info_size, decoded_device_info)) + feature_level = decoded_device_info[1]; + + free(decoded_device_info); + return feature_level; } |