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