Tests: Establish root Tests directory, move Userland/Tests there

With the goal of centralizing all tests in the system, this is a
first step to establish a Tests sub-tree. It will contain all of
the unit tests and test harnesses for the various components in the
system.

1 files changed, 106 insertions, 0 deletions

diff --git a/Tests/Kernel/munmap-multi-region-unmapping.cpp b/Tests/Kernel/munmap-multi-region-unmapping.cpp
new file mode 100644
index 0000000000..fba628a75f
--- /dev/null
+++ b/Tests/Kernel/munmap-multi-region-unmapping.cpp
@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2021, the SerenityOS developers.
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#include <AK/Types.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/mman.h>
+#include <unistd.h>
+
+int main()
+{
+    {
+        printf("Testing full unnmap\n");
+        auto* map1 = mmap(nullptr, 2 * PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, 0, 0);
+        if (map1 == MAP_FAILED) {
+            perror("mmap 1");
+            return 1;
+        }
+        auto* map2 = mmap((void*)((FlatPtr)map1 + 2 * PAGE_SIZE), 2 * PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, 0, 0);
+        if (map2 == MAP_FAILED) {
+            perror("mmap 2");
+            return 1;
+        }
+
+        ((u32*)map1)[0] = 0x41414141;
+        ((u32*)map1)[PAGE_SIZE / sizeof(u32)] = 0x42424242;
+
+        ((u32*)map2)[0] = 0xbeefbeef;
+        ((u32*)map2)[PAGE_SIZE / sizeof(u32)] = 0xc0dec0de;
+
+        if (((u32*)map1)[0] != 0x41414141 || ((u32*)map1)[PAGE_SIZE / sizeof(u32)] != 0x42424242
+            || ((u32*)map2)[0] != 0xbeefbeef || ((u32*)map2)[PAGE_SIZE / sizeof(u32)] != 0xc0dec0de) {
+            perror("write");
+            return 1;
+        }
+
+        int res = munmap(map1, 4 * PAGE_SIZE);
+        if (res < 0) {
+            perror("unmap");
+            return 1;
+        }
+    }
+    {
+        printf("Testing partial unmapping\n");
+        auto* map1 = mmap(nullptr, 2 * PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, 0, 0);
+        if (map1 == MAP_FAILED) {
+            perror("mmap 1");
+            return 1;
+        }
+        auto* map2 = mmap((void*)((FlatPtr)map1 + 2 * PAGE_SIZE), 2 * PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, 0, 0);
+        if (map2 == MAP_FAILED) {
+            perror("mmap 2");
+            return 1;
+        }
+
+        ((u32*)map1)[0] = 0x41414141;
+        ((u32*)map1)[PAGE_SIZE / sizeof(u32)] = 0x42424242;
+
+        ((u32*)map2)[0] = 0xbeefbeef;
+        ((u32*)map2)[PAGE_SIZE / sizeof(u32)] = 0xc0dec0de;
+
+        if (((u32*)map1)[0] != 0x41414141 || ((u32*)map1)[PAGE_SIZE / sizeof(u32)] != 0x42424242
+            || ((u32*)map2)[0] != 0xbeefbeef || ((u32*)map2)[PAGE_SIZE / sizeof(u32)] != 0xc0dec0de) {
+            perror("write");
+            return 1;
+        }
+
+        int res = munmap((void*)((FlatPtr)map1 + PAGE_SIZE), 2 * PAGE_SIZE);
+        if (res < 0) {
+            perror("unmap");
+            return 1;
+        }
+
+        auto* map3 = mmap((void*)((FlatPtr)map1 + PAGE_SIZE), PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, 0, 0);
+        if (map3 == MAP_FAILED) {
+            perror("remap 1");
+            return 1;
+        }
+        auto* map4 = mmap(map2, PAGE_SIZE, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE | MAP_FIXED, 0, 0);
+        if (map4 == MAP_FAILED) {
+            perror("remap 2");
+            return 1;
+        }
+        ((u32*)map3)[0] = 0x13371337;
+        ((u32*)map4)[0] = 0x1b1b1b1b;
+        if (((u32*)map1)[0] != 0x41414141 || ((u32*)map2)[PAGE_SIZE / sizeof(u32)] != 0xc0dec0de
+            || ((u32*)map3)[0] != 0x13371337 || ((u32*)map4)[0] != 0x1b1b1b1b
+            || ((u32*)map1)[PAGE_SIZE / sizeof(int)] != ((u32*)map3)[0] || ((u32*)map2)[0] != ((u32*)map4)[0]) {
+            perror("read at old map and write at remap");
+            return 1;
+        }
+
+        res = munmap(map1, PAGE_SIZE * 4);
+        if (res < 0) {
+            perror("cleanup");
+            return 1;
+        }
+    }
+
+    printf("PASS\n");
+    return 0;
+}