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Initial commit. CPU working well enough for simple hello world program.
author Michael Pavone <pavone@retrodev.com>
date Tue, 22 Mar 2016 22:44:02 -0700
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children 6204c81e2933
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-1:000000000000 0:7e44f7d5810b
1 #ifndef CPU_H_
2 #define CPU_H_
3
4
5 typedef struct cpu cpu;
6
7 typedef void (*port_write_fun) (cpu *context, uint8_t port, uint16_t value);
8 typedef uint16_t (*port_read_fun) (cpu *context, uint8_t port);
9
10 typedef struct {
11 port_write_fun write;
12 port_read_fun read;
13 } port_handler;
14
15
16 #define MEM_READ 1
17 #define MEM_WRITE 2
18
19 typedef struct {
20 uint8_t *base;
21 uint16_t start;
22 uint16_t end;
23 uint8_t flags;
24 } memory_region;
25
26
27 struct cpu {
28 uint32_t cycles;
29 uint32_t clock_inc;
30 uint32_t num_mem_regions;
31 uint16_t regs[16];
32 uint16_t exception;
33 uint16_t exception_pc;
34 uint16_t exception_sr;
35 uint16_t exception_ur;
36 uint16_t vector_base;
37
38 uint16_t prefetch;
39
40 uint8_t state;
41
42 port_handler port_handlers[16];
43 memory_region mem_regions[];
44 };
45
46 cpu* alloc_cpu(uint32_t clock_divider, uint32_t num_regions, memory_region *regions);
47 void run_cpu(cpu *context, uint32_t target_cycle);
48
49 enum {
50 LDIM,
51 LDIMH,
52 LD8,
53 LD16,
54 STR8,
55 STR16,
56 ADD,
57 ADC,
58 AND,
59 OR,
60 XOR,
61 LSL,
62 LSR,
63 ASR,
64 BCC,
65 SINGLE_SOURCE
66 };
67
68 enum {
69 MOVE,
70 NEG,
71 NOT,
72 CMP,
73 CALL,
74 SWAP,
75 IN,
76 OUT,
77 INI,
78 OUTI,
79 ADDI,
80 ANDI,
81 ORI,
82 LSI,
83 ASRI,
84 SINGLE_REG
85 };
86
87 enum {
88 RETI,
89 TRAP,
90 TRAPI,
91 GETEPC,
92 SETEPC,
93 GETESR,
94 SETESR,
95 GETEUR,
96 SETEUR,
97 GETENUM,
98 SETENUM
99 };
100
101 enum {
102 COND_ALWAYS,
103 COND_NEVER,
104 COND_ZERO,
105 COND_NZERO,
106 COND_NEG,
107 COND_POS,
108 COND_CARRY,
109 COND_NCARRY,
110 COND_GREATER,
111 COND_LEQ
112 };
113
114 #endif //CPU_H_