tests/qtest: QTest example for RISC-V CSR register

Added demo for reading CSR register from qtest environment.

Signed-off-by: Ivan Klokov <ivan.klokov@syntacore.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Daniel Henrique Barboza <dbarboza@ventanamicro.com>
Acked-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>

Author: Ivan Klokov

tests/qtest/meson.build

@@ -274,7 +274,7 @@ qtests_s390x = \
 qtests_riscv32 = \
   (config_all_devices.has_key('CONFIG_SIFIVE_E_AON') ? ['sifive-e-aon-watchdog-test'] : [])
 
-qtests_riscv64 = \
+qtests_riscv64 = ['riscv-csr-test'] + \
   (unpack_edk2_blobs ? ['bios-tables-test'] : [])
 
 qos_test_ss = ss.source_set()

tests/qtest/riscv-csr-test.c

@@ -0,0 +1,56 @@
+/*
+ * QTest testcase for RISC-V CSRs
+ *
+ * Copyright (c) 2024 Syntacore.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
+ */
+
+#include "qemu/osdep.h"
+#include "libqtest.h"
+
+#define CSR_MVENDORID       0xf11
+#define CSR_MISELECT        0x350
+
+static void run_test_csr(void)
+{
+    uint64_t res;
+    uint64_t val = 0;
+
+    QTestState *qts = qtest_init("-machine virt -cpu veyron-v1");
+
+    res = qtest_csr_call(qts, "get_csr", 0, CSR_MVENDORID, &val);
+
+    g_assert_cmpint(res, ==, 0);
+    g_assert_cmpint(val, ==, 0x61f);
+
+    val = 0xff;
+    res = qtest_csr_call(qts, "set_csr", 0, CSR_MISELECT, &val);
+
+    g_assert_cmpint(res, ==, 0);
+
+    val = 0;
+    res = qtest_csr_call(qts, "get_csr", 0, CSR_MISELECT, &val);
+
+    g_assert_cmpint(res, ==, 0);
+    g_assert_cmpint(val, ==, 0xff);
+
+    qtest_quit(qts);
+}
+
+int main(int argc, char **argv)
+{
+    g_test_init(&argc, &argv, NULL);
+
+    qtest_add_func("/cpu/csr", run_test_csr);
+
+    return g_test_run();
+}