Kernel: Implement RamdiskDevice

Kernel/Storage/RamdiskController.cpp

@@ -0,0 +1,90 @@
+/*
+ * Copyright (c) 2021, the SerenityOS developers
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/OwnPtr.h>
+#include <AK/RefPtr.h>
+#include <AK/Types.h>
+#include <Kernel/Storage/RamdiskController.h>
+
+namespace Kernel {
+
+NonnullRefPtr<RamdiskController> RamdiskController::initialize()
+{
+    return adopt(*new RamdiskController());
+}
+
+bool RamdiskController::reset()
+{
+    TODO();
+}
+
+bool RamdiskController::shutdown()
+{
+    TODO();
+}
+
+size_t RamdiskController::devices_count() const
+{
+    return m_devices.size();
+}
+
+void RamdiskController::start_request(const StorageDevice&, AsyncBlockDeviceRequest&)
+{
+    ASSERT_NOT_REACHED();
+}
+
+void RamdiskController::complete_current_request(AsyncDeviceRequest::RequestResult)
+{
+    ASSERT_NOT_REACHED();
+}
+
+RamdiskController::RamdiskController()
+    : StorageController()
+{
+    // Populate ramdisk controllers from Multiboot boot modules, if any.
+    size_t count = 0;
+    for (auto used_memory_range : MemoryManager::the().used_memory_ranges()) {
+        if (used_memory_range.type == UsedMemoryRangeType::BootModule) {
+            size_t length = PAGE_ROUND_UP(used_memory_range.end.get()) - used_memory_range.start.get();
+            auto region = MemoryManager::the().allocate_kernel_region(used_memory_range.start, length, "Ramdisk", Region::Access::Read | Region::Access::Write);
+            m_devices.append(RamdiskDevice::create(*this, move(region), 6, count));
+            count++;
+        }
+    }
+}
+
+RamdiskController::~RamdiskController()
+{
+}
+
+RefPtr<StorageDevice> RamdiskController::device(u32 index) const
+{
+    if (index >= m_devices.size())
+        return nullptr;
+    return m_devices[index];
+}
+
+}