From 8027941b705e219fd202b7c01d5a4a311670cbee Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Karel=20Ko=C4=8D=C3=AD?= <cynerd@email.cz>
Date: Sat, 7 Apr 2018 21:13:42 +0200
Subject: Add initial implementatio of caches

---
 qtmips_machine/tests/testcache.cpp | 61 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 qtmips_machine/tests/testcache.cpp

(limited to 'qtmips_machine/tests/testcache.cpp')

diff --git a/qtmips_machine/tests/testcache.cpp b/qtmips_machine/tests/testcache.cpp
new file mode 100644
index 0000000..02e734e
--- /dev/null
+++ b/qtmips_machine/tests/testcache.cpp
@@ -0,0 +1,61 @@
+#include "tst_machine.h"
+#include "cache.h"
+
+using namespace machine;
+
+void MachineTests::cache_data() {
+    QTest::addColumn<MachineConfigCache>("cache_c");
+    QTest::addColumn<unsigned>("hit");
+    QTest::addColumn<unsigned>("miss");
+
+    MachineConfigCache cache_c;
+    cache_c.set_write_policy(MachineConfigCache::WP_TROUGH);
+    cache_c.set_enabled(true);
+    cache_c.set_sets(8);
+    cache_c.set_blocks(1);
+    cache_c.set_associativity(1);
+    QTest::newRow("Directly mapped") << cache_c \
+                                     << (unsigned)3 \
+                                     << (unsigned)7;
+    cache_c.set_sets(1);
+    cache_c.set_blocks(8);
+    QTest::newRow("Wide") << cache_c \
+                                     << (unsigned)5 \
+                                     << (unsigned)5;
+    cache_c.set_sets(4);
+    cache_c.set_blocks(4);
+    QTest::newRow("Square") << cache_c \
+                                     << (unsigned)4 \
+                                     << (unsigned)6;
+}
+
+void MachineTests::cache() {
+    QFETCH(MachineConfigCache, cache_c);
+    QFETCH(unsigned, hit);
+    QFETCH(unsigned, miss);
+
+    Memory m;
+    Cache cch(&m, &cache_c);
+
+    // Test reads //
+    m.write_word(0x200, 0x24);
+    m.write_word(0x204, 0x66);
+    m.write_word(0x21c, 0x12);
+    m.write_word(0x300, 0x32);
+    for (int i = 0; i < 2; i++) {
+        QCOMPARE(cch.read_word(0x200), (std::uint32_t)0x24);
+        QCOMPARE(cch.read_word(0x204), (std::uint32_t)0x66);
+        QCOMPARE(cch.read_word(0x21c), (std::uint32_t)0x12);
+        QCOMPARE(cch.read_word(0x300), (std::uint32_t)0x32);
+    }
+
+    // Test writes //
+    cch.write_word(0x700, 0x24);
+    QCOMPARE(m.read_word(0x700), (std::uint32_t)0x24);
+    cch.write_word(0x700, 0x23);
+    QCOMPARE(m.read_word(0x700), (std::uint32_t)0x23);
+
+    // Verify counts
+    QCOMPARE(cch.hit(), hit);
+    QCOMPARE(cch.miss(), miss);
+}
-- 
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