efi_selftest: test variable services at runtime

Provide a unit test for the variable services at runtime.

Currently we expect EFI_UNSUPPORTED to be returned as the runtime
implementation is still missing.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

2 files changed, 95 insertions, 0 deletions

diff --git a/lib/efi_selftest/Makefile b/lib/efi_selftest/Makefile
index 3bebd0f573..88678755cc 100644
--- a/lib/efi_selftest/Makefile
+++ b/lib/efi_selftest/Makefile
@@ -35,6 +35,7 @@ efi_selftest_textoutput.o \
 efi_selftest_tpl.o \
 efi_selftest_util.o \
 efi_selftest_variables.o \
+efi_selftest_variables_runtime.o \
 efi_selftest_watchdog.o
 
 obj-$(CONFIG_EFI_DEVICE_PATH_TO_TEXT) += efi_selftest_devicepath.o
diff --git a/lib/efi_selftest/efi_selftest_variables_runtime.c b/lib/efi_selftest/efi_selftest_variables_runtime.c
new file mode 100644
index 0000000000..b3b40ad2cf
--- /dev/null
+++ b/lib/efi_selftest/efi_selftest_variables_runtime.c
@@ -0,0 +1,94 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * efi_selftest_variables_runtime
+ *
+ * Copyright (c) 2019 Heinrich Schuchardt <xypron.glpk@gmx.de>
+ *
+ * This unit test checks the runtime services for variables after
+ * ExitBootServices():
+ * GetVariable, GetNextVariableName, SetVariable, QueryVariableInfo.
+ */
+
+#include <efi_selftest.h>
+
+#define EFI_ST_MAX_DATA_SIZE 16
+#define EFI_ST_MAX_VARNAME_SIZE 40
+
+static struct efi_boot_services *boottime;
+static struct efi_runtime_services *runtime;
+static const efi_guid_t guid_vendor0 =
+	EFI_GUID(0x67029eb5, 0x0af2, 0xf6b1,
+		 0xda, 0x53, 0xfc, 0xb5, 0x66, 0xdd, 0x1c, 0xe6);
+
+/*
+ * Setup unit test.
+ *
+ * @handle	handle of the loaded image
+ * @systable	system table
+ */
+static int setup(const efi_handle_t img_handle,
+		 const struct efi_system_table *systable)
+{
+	boottime = systable->boottime;
+	runtime = systable->runtime;
+
+	return EFI_ST_SUCCESS;
+}
+
+/**
+ * execute() - execute unit test
+ *
+ * As runtime support is not implmented expect EFI_UNSUPPORTED to be returned.
+ */
+static int execute(void)
+{
+	efi_status_t ret;
+	efi_uintn_t len;
+	u32 attr;
+	u8 v[16] = {0x5d, 0xd1, 0x5e, 0x51, 0x5a, 0x05, 0xc7, 0x0c,
+		    0x35, 0x4a, 0xae, 0x87, 0xa5, 0xdf, 0x0f, 0x65,};
+	u8 data[EFI_ST_MAX_DATA_SIZE];
+	u16 varname[EFI_ST_MAX_VARNAME_SIZE];
+	efi_guid_t guid;
+	u64 max_storage, rem_storage, max_size;
+
+	ret = runtime->query_variable_info(EFI_VARIABLE_BOOTSERVICE_ACCESS,
+					   &max_storage, &rem_storage,
+					   &max_size);
+	if (ret != EFI_UNSUPPORTED) {
+		efi_st_error("QueryVariableInfo failed\n");
+		return EFI_ST_FAILURE;
+	}
+
+	ret = runtime->set_variable(L"efi_st_var0", &guid_vendor0,
+				    EFI_VARIABLE_BOOTSERVICE_ACCESS |
+				    EFI_VARIABLE_RUNTIME_ACCESS,
+				    3, v + 4);
+	if (ret != EFI_UNSUPPORTED) {
+		efi_st_error("SetVariable failed\n");
+		return EFI_ST_FAILURE;
+	}
+	len = 3;
+	ret = runtime->get_variable(L"efi_st_var0", &guid_vendor0,
+				    &attr, &len, data);
+	if (ret != EFI_UNSUPPORTED) {
+		efi_st_error("GetVariable failed\n");
+		return EFI_ST_FAILURE;
+	}
+	memset(&guid, 0, 16);
+	*varname = 0;
+	ret = runtime->get_next_variable_name(&len, varname, &guid);
+	if (ret != EFI_UNSUPPORTED) {
+		efi_st_error("GetNextVariableName failed\n");
+		return EFI_ST_FAILURE;
+	}
+
+	return EFI_ST_SUCCESS;
+}
+
+EFI_UNIT_TEST(variables_run) = {
+	.name = "variables at runtime",
+	.phase = EFI_SETUP_BEFORE_BOOTTIME_EXIT,
+	.setup = setup,
+	.execute = execute,
+};