[PATCH 6/7] tests/qtest: Add Sun-3 hardware interaction tests

[54weasels <54weasels@gmail.com>]

This adds basic architectural and register validation for the newly assembled Sun-3 machine.

Signed-off-by: 54weasels <54weasels@gmail.com>
---
 tests/qtest/meson.build |  1 +
 tests/qtest/sun3-test.c | 67 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 68 insertions(+)
 create mode 100644 tests/qtest/sun3-test.c

diff --git a/tests/qtest/meson.build b/tests/qtest/meson.build
index be4fa627b5..184d1a3f8c 100644
--- a/tests/qtest/meson.build
+++ b/tests/qtest/meson.build
@@ -154,6 +154,7 @@ qtests_loongarch64 = qtests_filter + \
    'cpu-plug-test']
 
 qtests_m68k = ['boot-serial-test'] + \
+  ['sun3-test'] + \
   qtests_filter
 
 qtests_microblaze = ['boot-serial-test'] + \
diff --git a/tests/qtest/sun3-test.c b/tests/qtest/sun3-test.c
new file mode 100644
index 0000000000..50f6c166d1
--- /dev/null
+++ b/tests/qtest/sun3-test.c
@@ -0,0 +1,67 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * QTest device validation for the Sun-3 Machine
+ *
+ * Copyright (c) 2026
+ */
+
+#include "qemu/osdep.h"
+#include "libqtest.h"
+
+/* OBIO Memory Map Addresses */
+#define SUN3_INTREG_BASE 0x0FEA0000
+#define SUN3_MEMERR_BASE 0x0FE80000
+
+static void test_intreg(void)
+{
+    QTestState *s;
+    uint8_t val;
+
+    s = qtest_init("-machine sun3 -nographic");
+
+    /* Default state should be 0 */
+    val = qtest_readb(s, SUN3_INTREG_BASE);
+    g_assert_cmphex(val, ==, 0x00);
+
+    /* Write and verify */
+    qtest_writeb(s, SUN3_INTREG_BASE, 0x0f);
+    val = qtest_readb(s, SUN3_INTREG_BASE);
+    g_assert_cmphex(val, ==, 0x0f);
+
+    qtest_quit(s);
+}
+
+static void test_memerr(void)
+{
+    QTestState *s;
+    uint8_t val;
+
+    s = qtest_init("-machine sun3 -nographic");
+
+    /* Default state should be 0x40 (default no-error) */
+    val = qtest_readb(s, SUN3_MEMERR_BASE);
+    g_assert_cmphex(val, ==, 0x40);
+
+    /* Test parity error spoof sequence */
+    qtest_writeb(s, SUN3_MEMERR_BASE, 0x20); /* Set test_parity_written */
+    qtest_writeb(s, SUN3_MEMERR_BASE, 0x50); /* Trigger spoof */
+    val = qtest_readb(s, SUN3_MEMERR_BASE);
+
+    /*
+     * Since we didn't clock enough parity lanes, high bit and lane 8 should
+     * be set (0x50 | 0x80 | 0x08 = 0xd8)
+     */
+    g_assert_cmphex(val, ==, 0xd8);
+
+    qtest_quit(s);
+}
+
+int main(int argc, char **argv)
+{
+    g_test_init(&argc, &argv, NULL);
+
+    qtest_add_func("/m68k/sun3/intreg", test_intreg);
+    qtest_add_func("/m68k/sun3/memerr", test_memerr);
+
+    return g_test_run();
+}
-- 
2.50.1 (Apple Git-155)