From 01ad5b6f308124d78624282b20a4689d0223a160 Mon Sep 17 00:00:00 2001
From: AnonymusRaccoon <tr.tristan-roux@outlook.fr>
Date: Thu, 23 Jan 2020 19:28:40 +0100
Subject: [PATCH] Creating the base of the Memory Bus

---
 CMakeLists.txt               |  2 +-
 sources/Memory/IMemory.cpp   | 25 +++++++++++++++++++++
 sources/Memory/IMemory.hpp   | 28 ++++++++++++++++++++++++
 sources/Memory/MemoryBus.cpp | 42 ++++++++++++++++++++++++++++++++++++
 sources/Memory/MemoryBus.hpp | 26 ++++++++++++++++++++++
 5 files changed, 122 insertions(+), 1 deletion(-)
 create mode 100644 sources/Memory/IMemory.cpp
 create mode 100644 sources/Memory/IMemory.hpp
 create mode 100644 sources/Memory/MemoryBus.cpp
 create mode 100644 sources/Memory/MemoryBus.hpp

diff --git a/CMakeLists.txt b/CMakeLists.txt
index bda854b..453fc87 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -15,4 +15,4 @@ target_link_libraries(unit_tests criterion -lgcov)
 target_compile_options(unit_tests PUBLIC -fprofile-arcs -ftest-coverage)
 
 # make app
-add_executable(ComSquare main.cpp sources/hello.cpp)
+add_executable(ComSquare main.cpp sources/hello.cpp sources/Memory/MemoryBus.cpp sources/Memory/MemoryBus.hpp sources/Memory/IMemory.hpp sources/Memory/IMemory.cpp)
diff --git a/sources/Memory/IMemory.cpp b/sources/Memory/IMemory.cpp
new file mode 100644
index 0000000..58816aa
--- /dev/null
+++ b/sources/Memory/IMemory.cpp
@@ -0,0 +1,25 @@
+//
+// Created by anonymus-raccoon on 1/23/20.
+//
+
+#include "IMemory.hpp"
+#include <algorithm>
+
+namespace ComSquare
+{
+	void IMemory::setMemoryRegion(uint32_t start, uint32_t end)
+	{
+		this->_start = start;
+		this->_end = end;
+	}
+
+	bool IMemory::hasMemorydAt(uint32_t addr)
+	{
+		return this->_start <= addr && addr <= this->_end;
+	}
+
+	uint32_t IMemory::getStart()
+	{
+		return this->_start;
+	}
+}
\ No newline at end of file
diff --git a/sources/Memory/IMemory.hpp b/sources/Memory/IMemory.hpp
new file mode 100644
index 0000000..39a1b45
--- /dev/null
+++ b/sources/Memory/IMemory.hpp
@@ -0,0 +1,28 @@
+//
+// Created by anonymus-raccoon on 1/23/20.
+//
+
+#ifndef COMSQUARE_IMEMORY_HPP
+#define COMSQUARE_IMEMORY_HPP
+
+
+#include <cstdint>
+#include <vector>
+
+namespace ComSquare
+{
+	class IMemory {
+	private:
+		uint32_t _start;
+		uint32_t _end;
+	public:
+		virtual uint8_t read(uint32_t addr) = 0;
+		virtual void write(uint32_t addr, uint8_t data) = 0;
+		void setMemoryRegion(uint32_t start, uint32_t end);
+		bool hasMemorydAt(uint32_t addr);
+		uint32_t getStart();
+	};
+};
+
+
+#endif //COMSQUARE_IMEMORY_HPP
diff --git a/sources/Memory/MemoryBus.cpp b/sources/Memory/MemoryBus.cpp
new file mode 100644
index 0000000..46ca3a2
--- /dev/null
+++ b/sources/Memory/MemoryBus.cpp
@@ -0,0 +1,42 @@
+//
+// Created by anonymus-raccoon on 1/23/20.
+//
+
+#include <ios>
+#include <iostream>
+#include "MemoryBus.hpp"
+
+namespace ComSquare
+{
+	IMemory *MemoryBus::getAccessor(uint32_t addr)
+	{
+		return std::find_if(this->_memoryAccessors.begin(), this->_memoryAccessors.end(), [addr](IMemory *accessor)
+		{
+			return accessor->hasMemorydAt(addr);
+		}).base();
+	}
+
+	uint8_t MemoryBus::read(uint32_t addr)
+	{
+		IMemory *handler = this->getAccessor(addr);
+
+		if (!handler) {
+			std::cout << "Unknown memory accessor for address " << std::hex << addr << ". Using open bus." << std::endl;
+			return this->_openbus;
+		}
+		uint8_t data =  handler->read(addr - handler->getStart());
+		this->_openbus = data;
+		return data;
+	}
+
+	void MemoryBus::write(uint32_t addr, uint8_t data)
+	{
+		IMemory *handler = this->getAccessor(addr);
+
+		if (!handler) {
+			std::cout << "Unknown memory accessor for address " << std::hex << addr << ". Warning, it was a write." << std::endl;
+			return;
+		}
+		handler->write(addr - handler->getStart(), data);
+	}
+}
\ No newline at end of file
diff --git a/sources/Memory/MemoryBus.hpp b/sources/Memory/MemoryBus.hpp
new file mode 100644
index 0000000..f480839
--- /dev/null
+++ b/sources/Memory/MemoryBus.hpp
@@ -0,0 +1,26 @@
+//
+// Created by anonymus-raccoon on 1/23/20.
+//
+
+#ifndef COMSQUARE_MEMORYBUS_HPP
+#define COMSQUARE_MEMORYBUS_HPP
+
+#include <cstdint>
+#include <vector>
+#include "IMemory.hpp"
+
+namespace ComSquare
+{
+	class MemoryBus {
+	private:
+		std::vector<IMemory> _memoryAccessors;
+		IMemory * getAccessor(uint32_t addr);
+		uint8_t _openbus;
+	public:
+		uint8_t read(uint32_t addr);
+		void write(uint32_t addr, uint8_t data);
+	};
+}
+
+
+#endif //COMSQUARE_MEMORYBUS_HPP