Kernel: Allow contiguous allocations in physical memory

For that, we have a new type of VMObject, called
ContiguousVMObject, that is responsible for allocating contiguous
physical pages.

1 files changed, 53 insertions, 0 deletions

diff --git a/Kernel/VM/ContiguousVMObject.h b/Kernel/VM/ContiguousVMObject.h
new file mode 100644
index 0000000000..b25d6dc1c0
--- /dev/null
+++ b/Kernel/VM/ContiguousVMObject.h
@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2020, Liav A. <liavalb@hotmail.co.il>
+ * 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.
+ */
+
+#pragma once
+
+#include <Kernel/VM/VMObject.h>
+#include <LibBareMetal/Memory/PhysicalAddress.h>
+
+namespace Kernel {
+
+class ContiguousVMObject final : public VMObject {
+public:
+    virtual ~ContiguousVMObject() override;
+
+    static NonnullRefPtr<ContiguousVMObject> create_with_size(size_t);
+
+private:
+    explicit ContiguousVMObject(size_t);
+    explicit ContiguousVMObject(const ContiguousVMObject&);
+
+    virtual const char* class_name() const override { return "ContiguousVMObject"; }
+    virtual NonnullRefPtr<VMObject> clone() override;
+
+    ContiguousVMObject& operator=(const ContiguousVMObject&) = delete;
+    ContiguousVMObject& operator=(ContiguousVMObject&&) = delete;
+    ContiguousVMObject(ContiguousVMObject&&) = delete;
+
+    virtual bool is_contiguous() const override { return true; }
+};
+}