hw: rework mapping and page-flags

Ref #2092

repos/base-hw/src/core/include/mapping.h

@@ -0,0 +1,52 @@
+/*
+ * \brief  Representation of physical to virtual memory mappings
+ * \author Stefan Kalkowski
+ * \date   2016-11-03
+ */
+
+/*
+ * Copyright (C) 2016 Genode Labs GmbH
+ *
+ * This file is part of the Genode OS framework, which is distributed
+ * under the terms of the GNU General Public License version 2.
+ */
+
+#ifndef _MAPPING_H_
+#define _MAPPING_H_
+
+#include <base/output.h>
+#include <page_flags.h>
+
+namespace Genode { struct Mapping; }
+
+struct Genode::Mapping
+{
+	addr_t     phys = 0;
+	addr_t     virt = 0;
+	size_t     size = 0;
+	Page_flags flags;
+
+	Mapping() {}
+
+	Mapping(addr_t virt, addr_t phys, Cache_attribute cacheable,
+	        bool io, unsigned size_log2, bool writeable)
+	: phys(phys), virt(virt), size(1 << size_log2),
+	  flags{ writeable, true, false, false, io, cacheable } {}
+
+	Mapping(addr_t phys, addr_t virt, size_t size, Page_flags flags)
+	: phys(phys), virt(virt), size(size), flags(flags) {}
+
+	void print(Output & out) const
+	{
+		Genode::print(out, "phys=", (void*)phys, " => virt=", (void*) virt,
+		              " (size=", Hex(size, Hex::PREFIX, Hex::PAD),
+		              " page-flags: ", flags, ")");
+	}
+
+	/**
+	 * Dummy implementation used by generic region_map code
+	 */
+	void prepare_map_operation() {}
+};
+
+#endif /* _MAPPING_H_ */

repos/base-hw/src/core/include/page_flags.h

@@ -15,37 +15,50 @@
 #define _CORE__INCLUDE__PAGE_FLAGS_H_
 
 #include <base/cache.h>
+#include <base/output.h>
 
-namespace Genode
+namespace Genode { struct Page_flags; }
+
+struct Genode::Page_flags
 {
+	bool            writeable;
+	bool            executable;
+	bool            privileged;
+	bool            global;
+	bool            device;
+	Cache_attribute cacheable;
+
 	/**
-	 * Map app-specific mem attributes to a TLB-specific POD
+	 * Create flag POD for Genode pagers
 	 */
-	struct Page_flags
+	static const Page_flags
+	apply_mapping(bool const writeable,
+	              Cache_attribute const cacheable,
+	              bool const io_mem) {
+		return Page_flags { writeable, true, false, false,
+			                io_mem, cacheable }; }
+
+	/**
+	 * Create flag POD for the mode transition region
+	 */
+	static const Page_flags mode_transition() {
+		return Page_flags { true, true, true, true, false, CACHED }; }
+
+	void print(Output & out) const
 	{
-		bool            writeable;
-		bool            executable;
-		bool            privileged;
-		bool            global;
-		bool            device;
-		Cache_attribute cacheable;
+		using Genode::print;
 
-		/**
-		 * Create flag POD for Genode pagers
-		 */
-		static const Page_flags
-		apply_mapping(bool const writeable,
-		              Cache_attribute const cacheable,
-		              bool const io_mem) {
-			return Page_flags { writeable, true, false, false,
-				                io_mem, cacheable }; }
-
-		/**
-		 * Create flag POD for the mode transition region
-		 */
-		static const Page_flags mode_transition() {
-			return Page_flags { true, true, true, true, false, CACHED }; }
-	};
-}
+		print(out, writeable  ? "writeable, " : "readonly, ",
+		           executable ? "exec, "      : "noexec, ");
+		if (privileged) print(out, "privileged, ");
+		if (global)     print(out, "global, ");
+		if (device)     print(out, "iomem, ");
+		switch (cacheable) {
+			case UNCACHED:       print(out, "uncached");       break;
+			case CACHED:         print(out, "cached");         break;
+			case WRITE_COMBINED: print(out, "write-combined"); break;
+		};
+	}
+};
 
 #endif /* _CORE__INCLUDE__PAGE_FLAGS_H_ */

repos/base-hw/src/core/include/pager.h

@@ -26,17 +26,12 @@
 
 /* core-local includes */
 #include <kernel/signal_receiver.h>
+#include <mapping.h>
 #include <object.h>
 #include <rpc_cap_factory.h>
 
 namespace Genode
 {
-
-	/**
-	 * Translation of a virtual page frame
-	 */
-	struct Mapping;
-
 	/**
 	 * Interface between the generic paging system and the base-hw backend
 	 */
@@ -55,32 +50,6 @@ namespace Genode
 	enum { PAGER_EP_STACK_SIZE = sizeof(addr_t) * 2048 };
 }
 
-struct Genode::Mapping
-{
-	addr_t          virt_address;
-	addr_t          phys_address;
-	Cache_attribute cacheable;
-	bool            io_mem;
-	unsigned        size_log2;
-	bool            writable;
-
-	/**
-	 * Constructor for invalid mappings
-	 */
-	Mapping();
-
-	/**
-	 * Constructor for valid mappings
-	 */
-	Mapping(addr_t const va, addr_t const pa, Cache_attribute const c,
-	        bool const io, unsigned const sl2, bool const w);
-
-	/**
-	 * Prepare for the application of the mapping
-	 */
-	void prepare_map_operation();
-};
-
 class Genode::Ipc_pager
 {
 	protected:

repos/base-hw/src/core/pager.cc

@@ -25,29 +25,6 @@
 using namespace Genode;
 
 
-/*************
- ** Mapping **
- *************/
-
-Mapping::Mapping(addr_t const va, addr_t const pa,
-                 Cache_attribute const c, bool const io,
-                 unsigned const sl2, bool const w)
-:
-	virt_address(va), phys_address(pa), cacheable(c),
-	io_mem(io), size_log2(sl2), writable(w)
-{ }
-
-
-Mapping::Mapping()
-:
-virt_address(0), phys_address(0), cacheable(CACHED),
-	io_mem(0), size_log2(0), writable(0)
-{ }
-
-
-void Mapping::prepare_map_operation() { }
-
-
 /***************
  ** Ipc_pager **
  ***************/

repos/base-hw/src/core/region_map_support.cc

@@ -81,13 +81,8 @@ void Pager_entrypoint::entry()
 				if (!locked_ptr.valid()) return;
 
 				Hw::Address_space * as = static_cast<Hw::Address_space*>(&*locked_ptr);
-				Page_flags const flags =
-					Page_flags::apply_mapping(_mapping.writable,
-											  _mapping.cacheable,
-											  _mapping.io_mem);
-				as->insert_translation(_mapping.virt_address,
-									   _mapping.phys_address,
-									   1 << _mapping.size_log2, flags);
+				as->insert_translation(_mapping.virt, _mapping.phys,
+				                       _mapping.size, _mapping.flags);
 			}
 
 			/* let pager object go back to no-fault state */