feat(unittests): add support for dynamic test harnesses
This patch adds support to the unittest framework to support
dynamic reconfiguration of test harnesses at run time, adding
flexibility to the tests.
It also replaces the build-time-linked test harnesses used
by the existing unit tests by dynamic ones and includes
some refactor on the slot buffer and the host test helpers to
ease the tests.
Signed-off-by: Javier Almansa Sobrino <javier.almansasobrino@arm.com>
Change-Id: Iabe9d0982d4fb6e78424fcd24a916324c7675697
diff --git a/lib/realm/tests/realm_test_utils.c b/lib/realm/tests/realm_test_utils.c
new file mode 100644
index 0000000..b752c5d
--- /dev/null
+++ b/lib/realm/tests/realm_test_utils.c
@@ -0,0 +1,47 @@
+/*
+ * SPDX-License-Identifier: BSD-3-Clause
+ * SPDX-FileCopyrightText: Copyright TF-RMM Contributors.
+ */
+
+#include <buffer.h>
+#include <buffer_private.h>
+#include <xlat_tables.h>
+
+/*
+ * Return the PA mapped to a given slot.
+ *
+ * NOTE: This API assumes a 4KB granularity and that the architecture
+ * has a VA space of 48 bits.
+ */
+static uintptr_t slot_to_pa(enum buffer_slot slot)
+{
+ struct xlat_table_entry *entry = get_cache_entry();
+ uintptr_t va = slot_to_va(slot);
+ uint64_t *desc_ptr = xlat_get_pte_from_table(entry, va);
+ uint64_t descriptor = xlat_read_descriptor(desc_ptr);
+
+ return (uintptr_t)(descriptor & XLAT_TTE_L3_PA_MASK);
+}
+
+/*
+ * Helper function to find the slot VA to which a PA is mapped to.
+ * This function is used to validate that the slot buffer library
+ * mapped the given PA to the VA that would be expected by the
+ * aarch64 VMSA.
+ */
+uintptr_t realm_test_util_get_slot_va(uintptr_t pa)
+{
+ for (unsigned int i = 0U; i < NR_CPU_SLOTS; i++) {
+ if (pa == slot_to_pa((enum buffer_slot)i)) {
+ /*
+ * Found a slot returning the same address, get
+ * the VA for that slot (the one that would be
+ * used by the aarch64 VMSA).
+ */
+ return slot_to_va((enum buffer_slot)i);
+ }
+ }
+
+ /* No buffer slot found */
+ return (uintptr_t)NULL;
+}