Added memory to the daemon state

3 files changed, 69 insertions, 1 deletions

diff --git a/daemon/src/Memory.cpp b/daemon/src/Memory.cpp
new file mode 100644
index 0000000..ddd9e4c
--- /dev/null
+++ b/daemon/src/Memory.cpp
@@ -0,0 +1,41 @@
+#include "Memory.h"
+
+#include <algorithm>
+#include <cstddef>
+#include <vector>
+
+#include "Assembly.h"
+
+
+Memory::Memory() noexcept :
+	content {}
+{}
+
+
+void Memory::apply(AssemblyContext ctx)
+{
+	ctx.bind("/read", [&](std::size_t len, std::size_t off) -> std::vector<char> { return read(len, off); });
+	ctx.bind("/write", [&](const std::vector<char> data, std::size_t off) -> bool { return write(data, off); });
+}
+
+
+auto Memory::read(std::size_t len, std::size_t off) const -> std::vector<char>
+{
+	if (content.size() < off)
+		return {};
+	auto real_len = std::min(len, content.size() - off);
+	auto data = content.data() + off;
+	return {data, data + real_len};
+}
+
+
+bool Memory::write(const std::vector<char> data, std::size_t off)
+{
+	if (content.size() < off || data.empty())
+		return false;
+	std::size_t in_data = 0;
+	std::size_t in_content = off;
+	for (; in_data < data.size() && in_content < content.size(); ++in_data, ++in_content)
+		content[in_content] = data[in_data];
+	return true;
+}
diff --git a/daemon/src/Memory.h b/daemon/src/Memory.h
new file mode 100644
index 0000000..2678355
--- /dev/null
+++ b/daemon/src/Memory.h
@@ -0,0 +1,22 @@
+#pragma once
+
+#include <array>
+#include <cstddef>
+#include <vector>
+
+#include "Assembly.h"
+
+
+class Memory
+{
+public:
+	Memory() noexcept;
+	void apply(AssemblyContext ctx);
+
+	constexpr static std::size_t size = 10 * 1024;
+private:
+	std::array<char, size> content;
+
+	std::vector<char> read(std::size_t len, std::size_t off) const;
+	bool write(const std::vector<char> data, std::size_t off);
+};
diff --git a/daemon/src/daemon.cpp b/daemon/src/daemon.cpp
index 9c841f8..28b95a4 100644
--- a/daemon/src/daemon.cpp
+++ b/daemon/src/daemon.cpp
@@ -5,13 +5,18 @@
 
 #include "Assembly.h"
 #include "Gpio.h"
+#include "Memory.h"
+
+
+static Gpio gpio;
+static Memory memory;
 
 
 int main(int, char **)
 {
 	rpc::server server(hwd::internal::port());
-	Gpio gpio;
 	Assembly assembly {server};
 	assembly.add("gpio", gpio);
+	assembly.add("memory", memory);
 	server.run();
 }