efi_global_getenv
status = efi_global_getenv("SecureBoot", &SecureBoot, &length);
status = efi_global_getenv("SetupMode", &SetupMode, &length);
if (efi_global_getenv("BootCurrent", &boot_current, &sz) == EFI_SUCCESS) {
if (efi_global_getenv("BootOrder", &boot_order, &sz) == EFI_SUCCESS) {
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);
rv = efi_global_getenv("ConOut", buf, &sz);
rv = efi_global_getenv("ConOutDev", buf, &sz);
rv = efi_global_getenv("ConIn", buf, &sz);
rv = efi_global_getenv("BootCurrent", &boot_current, &sz);
rv = efi_global_getenv("BootOrder", &boot_order, &sz);
rv = efi_global_getenv(buf, &boot_info, &sz);