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annotate src/cpu.h @ 43:6e7bfe83d2b0

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Changed the design to vastly simplify the video hardware and support a 23-bit address space on the CPU
author Michael Pavone <pavone@retrodev.com>
date Sat, 27 Aug 2016 22:38:31 -0700
parents fb14515266f4
children 51672bd41cdd
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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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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6e7bfe83d2b0 Changed the design to vastly simplify the video hardware and support a 23-bit address space on the CPU
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21 uint32_t start;
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22 uint32_t end;
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23 uint32_t mask;
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24 uint8_t flags;
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25 } memory_region;
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26
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27
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28 struct cpu {
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29 void *system;
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30 uint32_t cycles;
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31 uint32_t clock_inc;
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32 uint32_t current_target;
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33 uint32_t num_mem_regions;
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34 uint16_t regs[16];
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35 uint16_t exception;
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36 uint16_t exception_pc;
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37 uint16_t exception_pch;
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38 uint16_t exception_sr;
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39 uint16_t exception_ur;
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40 uint16_t vector_base;
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41 uint32_t pc_msb;
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42 uint32_t data_low_msb;
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43 uint32_t data_high_msb;
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44
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45 uint16_t prefetch;
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46
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47 uint8_t state;
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48 uint8_t pending_interrupts;
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49
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50 port_handler port_handlers[16];
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51 memory_region mem_regions[];
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52 };
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53
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54 cpu* alloc_cpu(uint32_t clock_divider, uint32_t num_regions, memory_region *regions);
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55 void run_cpu(cpu *context, uint32_t target_cycle);
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56 //To be implemented by system
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57 uint32_t next_interrupt_cycle(cpu *context, uint8_t mask);
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58 uint8_t get_current_interrupts(cpu *context);
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59 void ack_interrupt(cpu *context, int which);
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60
6
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61 extern char * mnemonics[];
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62 extern char * mnemonics_single_src[];
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63 extern char * mnemonics_single_reg[];
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64
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65 enum {
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66 LDIM,
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67 LDIMH,
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68 LD8,
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69 LD16,
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70 STR8,
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71 STR16,
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72 ADD,
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73 ADC,
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74 AND,
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75 OR,
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76 XOR,
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77 LSL,
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78 LSR,
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79 ASR,
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80 BCC,
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81 SINGLE_SOURCE
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82 };
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83
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84 enum {
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85 MOVE,
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86 NEG,
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87 NOT,
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88 CMP,
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89 CALL,
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90 SWAP,
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91 LONGJMP,
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92 INI,
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93 OUTI,
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94 ADDI,
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95 ANDI,
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96 ORI,
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97 XORI,
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98 LSI,
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6204c81e2933 Revert changes to handling of immediate versions of bitwise instructions. Replace asri with cmpi.
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99 CMPI,
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100 SINGLE_REG
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101 };
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102
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103 enum {
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104 RETI,
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105 TRAPI,
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106 GETEPC,
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107 SETEPC,
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108 GETEPCH,
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109 SETEPCH,
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110 GETESR,
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111 SETESR,
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112 GETEUR,
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113 SETEUR,
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114 GETENUM,
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115 SETENUM,
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116 GETVBR,
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117 SETVBR,
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118 GETDATABANKS,
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119 SETDATABANKS,
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120 };
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121
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122 enum {
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123 COND_ALWAYS,
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124 COND_NEVER,
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125 COND_ZERO,
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126 COND_NZERO,
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127 COND_NEG,
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128 COND_POS,
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129 COND_CARRY,
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130 COND_NCARRY,
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131 COND_GREATER,
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132 COND_LEQ
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133 };
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134
6
74a6d629b78f Added assembler. Removed hand-assembled version of hello world example
Michael Pavone <pavone@retrodev.com>
parents: 2
diff changeset
135 #define REG_PC 14
74a6d629b78f Added assembler. Removed hand-assembled version of hello world example
Michael Pavone <pavone@retrodev.com>
parents: 2
diff changeset
136 #define REG_SR 15
74a6d629b78f Added assembler. Removed hand-assembled version of hello world example
Michael Pavone <pavone@retrodev.com>
parents: 2
diff changeset
137
0
7e44f7d5810b Initial commit. CPU working well enough for simple hello world program.
Michael Pavone <pavone@retrodev.com>
parents:
diff changeset
138 #endif //CPU_H_