NEO.emu and Z80 CPU updates

* MD.emu: Refactor Z80 code as a class instead of using global variables
* MD.emu: Allow configuring memory access functions of the Z80 class at compile time
* MD.emu: Generate the Z80 flag lookup tables at compile time
* NEO.emu: Attempt to keep the 68K/Z80 in sync when the 68K reads/writes to the sound register, fixes missing intro audio in Blazing Star in console mode
* NEO.emu: Fix CMC50 M1 decryption issue causing missing audio in games like KOF2000 and SS5
* NEO.emu: Update ADPCM-B step value in YM2610ChangeSamplerate(), fixes audio from that channel changing pitch on sample rate change
* NEO.emu: When emulating the timer interrupt, guard the loop by the current line count
* NEO.emu: Remove a lot of unused code including old CPU cores
* NEO.emu: Remove current Z80 code and share code with MD.emu

MD.emu/build.mk

@@ -11,6 +11,11 @@ CPPFLAGS += -DLSB_FIRST \
 
 CFLAGS_WARN += -Wno-missing-field-initializers
 
+ifeq ($(config_compiler),clang)
+ # needed for Z80CPU::makeFlagTables()
+ CFLAGS_CODEGEN += -fconstexpr-steps=10000000
+endif
+
 # Genesis Plus includes
 CPPFLAGS += -I$(projectPath)/src \
 -I$(projectPath)/src/$(gplusPath) \

MD.emu/src/genplus-config.h

@@ -7,6 +7,12 @@ using int32 = int32_t;
 using uint8 = uint8_t;
 using uint16 = uint16_t;
 using uint32 = uint32_t;
+using INT8 = int8_t;
+using INT16 = int16_t;
+using INT32 = int32_t;
+using UINT8 = uint8_t;
+using UINT16 = uint16_t;
+using UINT32 = uint32_t;
 typedef int16 FMSampleType;
 typedef int16 PCMSampleType;
 static const uint8 config_dac_bits = 14;

MD.emu/src/genplus-gx/cart_hw/sms_cart.cc

@@ -189,23 +189,23 @@ void sms_cart_init(void)
   switch(slot.mapper)
   {
     case MAPPER_NONE:
-      z80_writemem = write_mapper_none;
+    	Z80.onWriteMem = write_mapper_none;
       break;
 
     case MAPPER_CODIES:
-      z80_writemem = write_mapper_codies;
+    	Z80.onWriteMem = write_mapper_codies;
       break;
 
     case MAPPER_KOREA:
-      z80_writemem = write_mapper_korea;
+    	Z80.onWriteMem = write_mapper_korea;
       break;
 
     case MAPPER_MSX:
-      z80_writemem = write_mapper_msx;
+    	Z80.onWriteMem = write_mapper_msx;
       break;
 
     default:
-      z80_writemem = write_mapper_sega;
+    	Z80.onWriteMem = write_mapper_sega;
       break;
   }
 

MD.emu/src/genplus-gx/genesis.cc

@@ -113,11 +113,11 @@ void gen_init(void)
   {
     /* initialize Z80 read handler */
     /* NB: memory map & write handler are defined by cartridge hardware */
-    z80_readmem = z80_sms_memory_r;
+    Z80.onReadMem = z80_sms_memory_r;
 
     /* initialize Z80 ports handlers */
-    z80_writeport = z80_sms_port_w;
-    z80_readport  = z80_sms_port_r;
+    Z80.onWritePort = z80_sms_port_w;
+    Z80.onReadPort  = z80_sms_port_r;
 
     /* initialize MS cartridge hardware */
     sms_cart_init();
@@ -162,12 +162,12 @@ void gen_init(void)
     }
 
     /* initialize Z80 memory handlers */
-    z80_writemem  = z80_md_memory_w;
-    z80_readmem   = z80_md_memory_r;
+    Z80.onWriteMem  = z80_md_memory_w;
+    Z80.onReadMem   = z80_md_memory_r;
 
     /* initialize Z80 port handlers */
-    z80_writeport = z80_unused_port_w;
-    z80_readport  = z80_unused_port_r;
+    Z80.onWritePort = z80_unused_port_w;
+    Z80.onReadPort  = z80_unused_port_r;
 
     /* initialize MD cartridge hardware */
     md_cart_init();

MD.emu/src/genplus-gx/shared.h

@@ -8,7 +8,6 @@
 #include "genplus-config.h"
 #include "macros.h"
 #include "m68k.h"
-#include "z80.h"
 #include "system.h"
 #include "genesis.h"
 #include "vdp_ctrl.h"

MD.emu/src/genplus-gx/sound/sn76489.h

@@ -6,6 +6,8 @@
 #ifndef _SN76489_H_
 #define _SN76489_H_
 
+#include <genplus-config.h>
+
 /* Function prototypes */
 
 extern void SN76489_Init(double PSGClockValue, int SamplingRate);

MD.emu/src/genplus-gx/sound/ym2413.cc

@@ -27,9 +27,8 @@ to do:
 
 /** EkeEke (2011): removed multiple chips support and cleaned code for Genesis Plus GX **/
 
-#include <math.h>
-
 #include "shared.h"
+#include <cmath>
 
 /* compiler dependence */
 #define INLINE static __inline__

MD.emu/src/genplus-gx/system.cc

@@ -43,6 +43,7 @@ uint32 mcycles_vdp;
 uint8 system_hw;
 void (*system_frame)(EmuEx::EmuSystemTaskContext, EmuEx::EmuVideo *);
 int (*audioUpdateFunc)(int16 *sb);
+Z80CPU<z80Desc> Z80;
 
 template <bool hasSegaCD = 0>
 static void system_frame_md(EmuEx::EmuSystemTaskContext, EmuEx::EmuVideo *);

MD.emu/src/genplus-gx/system.h

@@ -21,10 +21,10 @@
  *
  ****************************************************************************************/
 
-#ifndef _SYSTEM_H_
-#define _SYSTEM_H_
+#pragma once
 
 #include "genplus-config.h"
+#include <z80conf.hh>
 
 namespace EmuEx
 {
@@ -103,5 +103,17 @@ static bool emuSystemIs16Bit()
 	return system_hw != SYSTEM_PBC;
 }
 
-#endif /* _SYSTEM_H_ */
+extern Z80CPU<z80Desc> Z80;
 
+#define z80_readmap Z80.readMap()
+#define z80_writemap Z80.writeMap()
+#define z80_readmem Z80.readMem
+#define z80_writemem Z80.writeMem
+#define z80_readport Z80.readPort
+#define z80_writeport Z80.writePort
+
+static void z80_init() { Z80.init(); }
+static void z80_reset() { Z80.reset(); }
+static void z80_exit () {}
+static void z80_run(unsigned cycles) { Z80.run(cycles); }
+static void z80_set_nmi_line(unsigned state) { Z80.setNmiLine(state); }