Mercurial > repos > simple16
annotate src/cpu.h @ 0:7e44f7d5810b
Initial commit. CPU working well enough for simple hello world program.
author | Michael Pavone <pavone@retrodev.com> |
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date | Tue, 22 Mar 2016 22:44:02 -0700 |
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children | 6204c81e2933 |
rev | line source |
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0
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Initial commit. CPU working well enough for simple hello world program.
Michael Pavone <pavone@retrodev.com>
parents:
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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_ |