Merge pull request #2734 from jriwanek-forks/nec-v20

Nec v20

src/include/86box/i8080.h

@@ -0,0 +1,56 @@
+/*
+ * 86Box	A hypervisor and IBM PC system emulator that specializes in
+ *		running old operating systems and software designed for IBM
+ *		PC systems and compatibles from 1981 through fairly recent
+ *		system designs based on the PCI bus.
+ *
+ *		This file is part of the 86Box distribution.
+ *
+ *		8080 CPU emulation (header).
+ *
+ * Authors:	Cacodemon345
+ *
+ *		Copyright 2022 Cacodemon345
+ */
+
+#include <stdint.h>
+
+typedef struct i8080
+{
+    union { 
+        uint16_t af; /* Intended in case we also go for μPD9002 emulation, which also has a Z80 emulation mode. */
+        struct { uint8_t a, flags; };
+    };
+    union
+    {
+        uint16_t bc;
+        struct { uint8_t b, c; };
+    };
+    union
+    {
+        uint16_t de;
+        struct { uint8_t d, e; };
+    };
+    union
+    {
+        uint16_t hl;
+        struct { uint8_t h, l; };
+    };
+    uint16_t pc, sp;
+    uint16_t oldpc, ei;
+    uint32_t pmembase, dmembase; /* Base from where i8080 starts. */
+    uint8_t emulated; /* 0 = not emulated, use separate registers, 1 = emulated, use x86 registers. */
+    uint16_t* cpu_flags;
+    void (*writemembyte)(uint32_t, uint8_t);
+    uint8_t (*readmembyte)(uint32_t);
+    void (*startclock)();
+    void (*endclock)();
+    void (*checkinterrupts)();
+    uint8_t (*fetchinstruction)();
+} i8080;
+
+#define C_FLAG_I8080 (1 << 0)
+#define P_FLAG_I8080 (1 << 2)
+#define AC_FLAG_I8080 (1 << 4)
+#define Z_FLAG_I8080 (1 << 6)
+#define S_FLAG_I8080 (1 << 7)