efi_global_getenv
EFI_STATUS efi_global_getenv(const char *v, void *data, size_t *len);
status = efi_global_getenv(name, buf, &sz);
status = efi_global_getenv(name, buf, &sz);
status = efi_global_getenv(name, buf, &sz);
status = efi_global_getenv(name, buf, &sz);
status = efi_global_getenv(name, buf, &sz);
status = efi_global_getenv(name, buf, &sz);
status = efi_global_getenv(name, buf, &sz);
status = efi_global_getenv(name, buf, &sz);
status = efi_global_getenv(name, buf, &sz);
rv = efi_global_getenv("ConOut", buf, &sz);
rv = efi_global_getenv("ConOutDev", buf, &sz);
efi_global_getenv("BootCurrent", &boot_current, &sz);
efi_global_getenv("BootOrder", &boot_order, &sz);
status = efi_global_getenv("OsIndicationsSupported",