Purge legacy HTIF things

The SCR file is gone, too, because it was tightly coupled.  The
general concept could be revived as a module that somehow connects
to the debug module.

csrc/htif_emulator.h

@@ -1,39 +0,0 @@
-// See LICENSE for license details.
-
-#ifndef _HTIF_EMULATOR_H
-#define _HTIF_EMULATOR_H
-
-#include <fesvr/htif_pthread.h>
-
-class htif_emulator_t : public htif_pthread_t
-{
- int memory_channel_mux_select;
-
- public:
-  htif_emulator_t(const std::vector<std::string>& args)
-    : htif_pthread_t(args),
-      memory_channel_mux_select(0)
-  {
-    for (const auto& arg: args) {
-      if (!strncmp(arg.c_str(), "+memory_channel_mux_select=", 27))
-        memory_channel_mux_select = atoi(arg.c_str()+27);
-    }
- }
-
-  void set_clock_divisor(int divisor, int hold_cycles)
-  {
-#ifdef UNCORE_SCR__HTIF_IO_CLOCK_DIVISOR__OFFSET
-    /* We only want to write the HTIF clock divisor SCR on targets where it
-     * actually exists (there isn't one on the FPGA, for example). */
-    write_cr(-1, UNCORE_SCR__HTIF_IO_CLOCK_DIVISOR__OFFSET, divisor | hold_cycles << 16);
-#endif
-  }
-
-  void start()
-  {
-    set_clock_divisor(5, 2);
-    htif_pthread_t::start();
-  }
-};
-
-#endif