Split up common into kernel,place,route

Signed-off-by: gatecat <gatecat@ds0.me>

common/kernel/embed.cc

@@ -0,0 +1,49 @@
+#if defined(WIN32)
+#include <windows.h>
+#endif
+#include <boost/filesystem.hpp>
+#include <boost/iostreams/device/mapped_file.hpp>
+#include "embed.h"
+#include "nextpnr.h"
+
+NEXTPNR_NAMESPACE_BEGIN
+
+#if defined(EXTERNAL_CHIPDB_ROOT)
+
+const void *get_chipdb(const std::string &filename)
+{
+    static std::map<std::string, boost::iostreams::mapped_file> files;
+    if (!files.count(filename)) {
+        std::string full_filename = EXTERNAL_CHIPDB_ROOT "/" + filename;
+        if (boost::filesystem::exists(full_filename))
+            files[filename].open(full_filename, boost::iostreams::mapped_file::priv);
+    }
+    if (files.count(filename))
+        return files.at(filename).data();
+    return nullptr;
+}
+
+#elif defined(WIN32)
+
+const void *get_chipdb(const std::string &filename)
+{
+    HRSRC rc = ::FindResource(nullptr, filename.c_str(), RT_RCDATA);
+    HGLOBAL rcData = ::LoadResource(nullptr, rc);
+    return ::LockResource(rcData);
+}
+
+#else
+
+EmbeddedFile *EmbeddedFile::head = nullptr;
+
+const void *get_chipdb(const std::string &filename)
+{
+    for (EmbeddedFile *file = EmbeddedFile::head; file; file = file->next)
+        if (file->filename == filename)
+            return file->content;
+    return nullptr;
+}
+
+#endif
+
+NEXTPNR_NAMESPACE_END